Dataset Information

granule_type: ATL03
short_name: ATL03
level: L2
description: This data set (ATL03) contains height above the WGS 84 ellipsoid (ITRF2014 reference frame), latitude, longitude, and time for all photons downlinked by the Advanced Topographic Laser Altimeter System (ATLAS) instrument on board the Ice, Cloud and land Ele
contributor_name: Thomas E Neumann (thomas.neumann@nasa.gov), Thorsten Markus (thorsten.markus@nasa.gov), Suneel Bhardwaj (suneel.bhardwaj@nasa.gov) David W Hancock III (david.w.hancock@nasa.gov)
contributor_role: Instrument Engineer, Investigator, Principle Investigator, Data Producer, Data Producer
Conventions: CF-1.6
date_type: UTC
featureType: trajectory
geospatial_lat_units: degrees_north
geospatial_lon_units: degrees_east
identifier_product_doi: 10.5067/ATLAS/ATL03.001
identifier_product_doi_authority: http://dx.doi.org
identifier_product_type: ATL03
license: Data may not be reproduced or distributed without including the citation for this product included in this metadata. Data may not be distributed in an altered form without the written permission of the ICESat-2 Science Project Office at NASA/GSFC.
naming_authority: http://dx.doi.org
spatial_coverage_type: Horizontal
standard_name_vocabulary: CF-1.6
time_type: CCSDS UTC-A
date_created: 2019-09-16T08:58:39.000000Z
hdfversion: HDF5 1.10.3
history: 2019-09-16T08:58:39.000000Z;fcc2d85c-d62f-3fd2-80df-66faf8b5709d;Created by PGE atlas_l2a_alt Version 3.2
identifier_file_uuid: fcc2d85c-d62f-3fd2-80df-66faf8b5709d
identifier_product_format_version: 3.2
time_coverage_duration: 422.00000000000000
time_coverage_end: 2018-10-27T04:50:09.000000Z
time_coverage_start: 2018-10-27T04:43:07.000000Z
geospatial_lat_min: -27.002708957117243
geospatial_lon_min: -29.134439056054468
geospatial_lat_max: -0.089309352519341773
geospatial_lon_max: -26.305204172545441
publisher_name: NSIDC DAAC > NASA National Snow and Ice Data Center Distributed Active Archive Center
publisher_email: nsidc@nsidc.org
publisher_url: http://nsidc.org/daac/
title: ATLAS/ICESat-2 L2A Global Geolocated Photon Data
identifier_file_product_type: ATL03
institution: National Aeronautics and Space Administration (NASA)
creator_name: GSFC I-SIPS > ICESat-2 Science Investigator-led Processing System
summary: The purpose of ATL03 is to provide along-track photon data for all 6 ATLAS beams and associated statistics.
keywords: EARTH SCIENCE > CRYOSPHERE > SEA ICE > NONE > NONE > NONE > NONE
keywords_vocabulary: NASA/GCMD Science Keywords
citation: Cite these data in publications as follows: The data used in this study were produced by the ICESat-2 Science Project Office at NASA/GSFC. The data archive site is the NASA National Snow and Ice Data Center Distributed Active Archive Center.
processing_level: 2A
references: http://nsidc.org/data/icesat2/data.html
project: ICESat-2 > Ice, Cloud, and land Elevation Satellite-2
instrument: ATLAS > Advanced Topographic Laser Altimeter System
platform: ICESat-2 > Ice, Cloud, and land Elevation Satellite-2
source: Spacecraft
Unlimited_Dimension: atlas_impulse_response_pce1_spot1_tep_histogram_tep_hist_time, atlas_impulse_response_pce1_spot1_tep_histogram_tep_tod, atlas_impulse_response_pce2_spot3_tep_histogram_tep_hist_time, atlas_impulse_response_pce2_spot3_tep_histogram_tep_tod, gt1r_bckgrd_atlas_delta_time, gt1r_geolocation_delta_time, gt1r_geophys_corr_delta_time, gt1r_heights_delta_time, gt1r_signal_find_output_ocean_delta_time, gt2r_bckgrd_atlas_delta_time, gt2r_geolocation_delta_time, gt2r_geophys_corr_delta_time, gt2r_heights_delta_time, gt2r_signal_find_output_ocean_delta_time, gt3r_bckgrd_atlas_delta_time, gt3r_geolocation_delta_time, gt3r_geophys_corr_delta_time, gt3r_heights_delta_time, gt3r_signal_find_output_ocean_delta_time, orbit_info_crossing_time, orbit_info_sc_orient_time, FakeDim2, FakeDim3, FakeDim4


Variables in this Dataset

orbit_info_cycle_number: Array of 16 bit Integers [orbit_info_crossing_time = 0..0]
units: counts
contentType: referenceInformation
long_name: Cycle Number
description: Tracks the number of 91-day cycles in the mission, beginning with 01. A unique orbit number can be determined by subtracting 1 from the cycle_number, multiplying by 1387 and adding the rgt value.
source: POD/PPD
valid_min: 0
valid_max: 50
origname: cycle_number
fullnamepath: /orbit_info/cycle_number
coordinates: orbit_info_crossing_time
orbit_info_orbit_number: Array of 16 bit Unsigned integers [orbit_info_crossing_time = 0..0]
units: 1
contentType: referenceInformation
long_name: Orbit Number
description: Unique identifying number for each planned ICESat-2 orbit.
source: Operations
valid_min: 1
valid_max: 65000
origname: orbit_number
fullnamepath: /orbit_info/orbit_number
coordinates: orbit_info_crossing_time
orbit_info_lan: Array of 64 bit Reals [orbit_info_crossing_time = 0..0]
units: degrees_east
contentType: referenceInformation
long_name: Ascending Node Longitude
description: Longitude at the ascending node crossing.
source: POD/PPD
valid_min: -180.00000000000000
valid_max: 180.00000000000000
origname: lan
fullnamepath: /orbit_info/lan
coordinates: orbit_info_crossing_time
orbit_info_sc_orient: Array of 16 bit Integers [orbit_info_sc_orient_time = 0..0]
units: 1
contentType: referenceInformation
long_name: Spacecraft Orientation
description: This parameter tracks the spacecraft orientation between forward, backward and transitional flight modes. ICESat-2 is considered to be flying forward when the weak beams are leading the strong beams; and backward when the strong beams are leading the weak beams. ICESat-2 is considered to be in transition while it is maneuvering between the two orientations. Science quality is potentially degraded while in transition mode.
source: POD/PPD
flag_meanings: backward forward transition
flag_values: 0, 1, 2
valid_min: 0
valid_max: 2
origname: sc_orient
fullnamepath: /orbit_info/sc_orient
coordinates: orbit_info_sc_orient_time
orbit_info_rgt: Array of 16 bit Integers [orbit_info_crossing_time = 0..0]
units: counts
contentType: referenceInformation
long_name: Reference Ground track
description: The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT2L and GT2R. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs.
source: POD/PPD
valid_min: 1
valid_max: 1387
origname: rgt
fullnamepath: /orbit_info/rgt
coordinates: orbit_info_crossing_time
gt1r_bckgrd_atlas_bckgrd_int_height: Array of 32 bit Reals [gt1r_bckgrd_atlas_delta_time = 0..83959]
units: meters
contentType: modelResult
long_name: Altimetric range window width
description: The height of the altimetric range window. This is the height over which the 50-shot sum is generated. Parameter is ingested at 50-Hz, and values are repeated to form a 200-Hz array.
source: ATL03 ATBD Section 7.3
origname: bckgrd_int_height
fullnamepath: /gt1r/bckgrd_atlas/bckgrd_int_height
coordinates: gt1r_bckgrd_atlas_delta_time
gt1r_bckgrd_atlas_tlm_height_band1: Array of 32 bit Reals [gt1r_bckgrd_atlas_delta_time = 0..83959]
units: meters
description: The height in meters of the telemetry band 1.
source: ATL03 ATBD, Section 7.3.2
long_name: Height of the telemetry band 1
origname: tlm_height_band1
fullnamepath: /gt1r/bckgrd_atlas/tlm_height_band1
coordinates: gt1r_bckgrd_atlas_delta_time
gt1r_bckgrd_atlas_bckgrd_rate: Array of 32 bit Reals [gt1r_bckgrd_atlas_delta_time = 0..83959]
units: counts / second
contentType: modelResult
long_name: Background count rate based on the ATLAS 50-shot sum
description: The background count rate from the 50-shot altimetric histogram after removing the number of likely signal photons based on Section 5.
source: ATL03 ATBD Section 7.3
origname: bckgrd_rate
fullnamepath: /gt1r/bckgrd_atlas/bckgrd_rate
coordinates: gt1r_bckgrd_atlas_delta_time
gt1r_bckgrd_atlas_tlm_top_band1: Array of 32 bit Reals [gt1r_bckgrd_atlas_delta_time = 0..83959]
units: meters
long_name: Ellipsoidal height of the top of the telemetry band 1.
description: The ellipsoidal heights with respect to WGS-84 of the top of the telemetry band 1, with all geophysical corrections applied.
source: ATL03 ATBD, Section 3.2, 7.3.2
origname: tlm_top_band1
fullnamepath: /gt1r/bckgrd_atlas/tlm_top_band1
coordinates: gt1r_bckgrd_atlas_delta_time
gt1r_bckgrd_atlas_tlm_top_band2: Array of 32 bit Reals [gt1r_bckgrd_atlas_delta_time = 0..83959]
units: meters
long_name: Ellipsoidal height of the top of the telemetry band 2.
description: The ellipsoidal heights with respect to WGS-84 of the top of the telemetry band 2, with all geophysical corrections applied.
source: ATL03 ATBD, Section 3.2, 7.3.2
origname: tlm_top_band2
fullnamepath: /gt1r/bckgrd_atlas/tlm_top_band2
coordinates: gt1r_bckgrd_atlas_delta_time
gt1r_bckgrd_atlas_bckgrd_int_height_reduced: Array of 32 bit Reals [gt1r_bckgrd_atlas_delta_time = 0..83959]
units: meters
contentType: modelResult
long_name: Altimetric range window height - reduced
description: The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span.
source: ATL03 ATBD Section 7.3
origname: bckgrd_int_height_reduced
fullnamepath: /gt1r/bckgrd_atlas/bckgrd_int_height_reduced
coordinates: gt1r_bckgrd_atlas_delta_time
gt1r_bckgrd_atlas_bckgrd_hist_top: Array of 32 bit Reals [gt1r_bckgrd_atlas_delta_time = 0..83959]
units: meters
contentType: modelResult
long_name: Top of the altimetric range window
description: The height of the top of the altimetric histogram, in meters above the WGS-84 ellipsoid, with all geophysical corrections applied. Parameter is ingested at 50-Hz, and values are repeated to form a 200-Hz array.
source: ATL03 ATBD Section 7.3
origname: bckgrd_hist_top
fullnamepath: /gt1r/bckgrd_atlas/bckgrd_hist_top
coordinates: gt1r_bckgrd_atlas_delta_time
gt1r_bckgrd_atlas_bckgrd_counts_reduced: Array of 32 bit Integers [gt1r_bckgrd_atlas_delta_time = 0..83959]
units: counts
contentType: modelResult
long_name: ATLAS 50-shot background count - reduced
description: Number of photon counts in the 50-shot sum after subtracting the number of signal photon events, defined as in ATBD Section 5, in that span.
source: ATL03 ATBD Section 7.3
origname: bckgrd_counts_reduced
fullnamepath: /gt1r/bckgrd_atlas/bckgrd_counts_reduced
coordinates: gt1r_bckgrd_atlas_delta_time
gt1r_bckgrd_atlas_tlm_height_band2: Array of 32 bit Reals [gt1r_bckgrd_atlas_delta_time = 0..83959]
units: meters
long_name: Height of the telemetry band 2
description: The height in meters of the telemetry band 2. (if 0, second band is not present).
source: ATL03 ATBD, Section 7.3.2
origname: tlm_height_band2
fullnamepath: /gt1r/bckgrd_atlas/tlm_height_band2
coordinates: gt1r_bckgrd_atlas_delta_time
gt1r_bckgrd_atlas_bckgrd_counts: Array of 32 bit Integers [gt1r_bckgrd_atlas_delta_time = 0..83959]
units: counts
contentType: modelResult
long_name: ATLAS 50-shot background count
description: Onboard 50 shot background (200 Hz) sum of photon events within the altimetric range window.
source: ATL03 ATBD Section 7.3
origname: bckgrd_counts
fullnamepath: /gt1r/bckgrd_atlas/bckgrd_counts
coordinates: gt1r_bckgrd_atlas_delta_time
gt1r_geolocation_segment_ph_cnt: Array of 32 bit Integers [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 0
units: counts
long_name: Number of photons
description: Number of photons in a given along-track segment. In the case of no photons within the segment (segment_ph_cnt=0), most other parameters are filled with invalid or best-estimate values. Maintaining geolocation segments with no photons allows for the geolocation segment arrays to be directly aligned across the gtx groups.
source: Derived
origname: segment_ph_cnt
fullnamepath: /gt1r/geolocation/segment_ph_cnt
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_segment_length: Array of 64 bit Reals [gt1r_geolocation_delta_time = 0..149895]
units: meters
long_name: along-track segment length
description: The along-track length of the along-track segment. Nominally these are 20m, but they vary from 19.8m to 20.2m.
source: ATL03 ATBD, Section 3.1
origname: segment_length
fullnamepath: /gt1r/geolocation/segment_length
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_range_bias_corr: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
long_name: range bias correction
description: The range_bias estimated from geolocation analysis.
source: ATL03G ATBD, Section 3.6
_FillValue: 3.402823466e+38
units: meters
origname: range_bias_corr
fullnamepath: /gt1r/geolocation/range_bias_corr
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_neutat_delay_derivative: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters/meters
long_name: (Neutral Atmosphere delay)/dh
description: Change in neutral atmospheric delay per height change
source: ATL03a ATBD
origname: neutat_delay_derivative
fullnamepath: /gt1r/geolocation/neutat_delay_derivative
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_reference_photon_lon: Array of 64 bit Reals [gt1r_geolocation_delta_time = 0..149895]
units: degrees_east
long_name: Segment Longitude
standard_name: longitude
description: Longitude of each reference photon. Computed from the ECF Cartesian coordinates of the bounce point. In the case of no photons within the segment (segment_ph_cnt=0), the coordinates are the midpoint of the geolocation segment on the reference ground track.
source: ATL03G ATBD, Section 3.4
valid_min: -180.00000000000000
valid_max: 180.00000000000000
origname: reference_photon_lon
fullnamepath: /gt1r/geolocation/reference_photon_lon
coordinates: gt1r_geolocation_delta_time
gt1r_geolocation_sigma_across: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: across-track geolocation uncertainty
description: Estimated Cartesian across-track uncertainity (1-sigma) for the refrerence photon
source: ATL03G ATBD
origname: sigma_across
fullnamepath: /gt1r/geolocation/sigma_across
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_sigma_lon: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: degrees
long_name: longitude uncertainty
description: Estimated geodetic east Longitude uncertainty (1-sigma), for the reference photon bounce point.
source: ATL03G ATBD, Section 3.6
origname: sigma_lon
fullnamepath: /gt1r/geolocation/sigma_lon
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_ref_azimuth: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: radians
long_name: Azimuth
standard_name: azimuth
description: Azimuth of the unit pointing vector for the reference photon in the local ENU frame in radians. The angle is measured from North and positive towards East.
source: ATL03G ATBD, Section 3.3
origname: ref_azimuth
fullnamepath: /gt1r/geolocation/ref_azimuth
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_ref_elev: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: radians
long_name: elevation
standard_name: elevation
description: Elevation of the unit pointing vector for the reference photon in the local ENU frame in radians. The angle is measured from East-North plane and positive towards Up
source: ATL03G ATBD, Section 3.3
origname: ref_elev
fullnamepath: /gt1r/geolocation/ref_elev
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_neutat_ht: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Neutral atmosphere ref height
description: Reference height of the neutral atmosphere range correction
source: ATL03a ATBD
origname: neutat_ht
fullnamepath: /gt1r/geolocation/neutat_ht
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_solar_azimuth: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: degrees_east
long_name: solar azimuth
description: The azimuth of the sun position vector from the reference photon bounce point position in the local ENU frame. The angle is measured from North and is positive towards East. ATL03g provides this value in radians; it is converted to degrees for ATL03 output.
source: ATL03G ATBD, Section 3.3
origname: solar_azimuth
fullnamepath: /gt1r/geolocation/solar_azimuth
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_surf_type: Array of 16 bit Integers [gt1r_geolocation_delta_time = 0..149895][ds_surf_type = 0..4]
units: 1
contentType: referenceInformation
long_name: Surface Type
description: Flags describing which surface types this interval is associated with. 0=not type, 1=is type. Order of array is land, ocean, sea ice, land ice, inland water.
source: ATL03 ATBD, Section 4
flag_meanings: not_type is_type
flag_values: 0, 1
valid_min: 0
valid_max: 1
origname: surf_type
fullnamepath: /gt1r/geolocation/surf_type
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_sigma_lat: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: 1
long_name: latitude uncertainty
description: Estimated geodetic Latitude uncertainty (1-sigma), for the reference photon bounce point.
source: ATL03G ATBD, Section 3.6
origname: sigma_lat
fullnamepath: /gt1r/geolocation/sigma_lat
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_tx_pulse_width_lower: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: seconds
long_name: Transmit Pulse Energy Lower Width
description: The average distance between the lower threshold crossing times measured by the Start Pulse Detector.
source: ATL02 ATBD, Section 7.2
origname: tx_pulse_width_lower
fullnamepath: /gt1r/geolocation/tx_pulse_width_lower
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_sigma_along: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: along-track geolocation uncertainity
description: Estimated cartesian along-track uncertainanty (1-sigma) for the reference photon
source: ATL03G ATBD
origname: sigma_along
fullnamepath: /gt1r/geolocation/sigma_along
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_tx_pulse_skew_est: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: seconds
long_name: Transmit Pulse Skew Estimate
description: The difference between the averages of the lower and upper threshold crossing times. This is an estimate of the transmit pulse skew.
source: ATL02 ATBD, Section 7.2
origname: tx_pulse_skew_est
fullnamepath: /gt1r/geolocation/tx_pulse_skew_est
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_tx_pulse_energy: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: Joules
contentType: physicalMeasurement
long_name: Transmit Pulse Energy
description: The average transmit pulse energy, measured by the internal laser energy monitor, split into per-beam measurements.
source: ATL02 ATBD, Section 7.2
origname: tx_pulse_energy
fullnamepath: /gt1r/geolocation/tx_pulse_energy
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_tx_pulse_width_upper: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: seconds
long_name: Transmit Pulse Energy Upper Width
description: The average distance between the upper threshold crossing times measured by the Start Pulse Detector.
source: ATL02 ATBD, Section 7.2
origname: tx_pulse_width_upper
fullnamepath: /gt1r/geolocation/tx_pulse_width_upper
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_sigma_h: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: 1
long_name: height uncertainty
description: Estimated height uncertainty (1-sigma) for the reference photon bounce point.
source: ATL03G ATBD, Section 3.6
origname: sigma_h
fullnamepath: /gt1r/geolocation/sigma_h
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_podppd_flag: Array of 16 bit Integers [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 0
units: 1
long_name: POD_PPD Flag
description: Composite POD/PPD flag that indicates the quality of input geolocation products for the specific ATL03 segment. A non-zero value may indicate that geolocation solutions are degraded. The ATL03 sigma values should indicate the degree of uncertainty associated with the degredation. Possible values are: 0=NOMINAL; 1=LRS; 2=LASERS; 3=GYRO; 4=SST1; 5=SST2; 6=ATT_INTERP; 7=MANEUVER; 8=GPS_DATA_GAP; 9-ST_BLINDING; 10=OTHER. Values 1-6 (PPD) are prioritized over values 7-10 (POD). In the case where both POD and PPD report an error, only the PAD value is indicated.
source: ANC04, ANC05
flag_meanings: nominal lrs lasers gyro sst1 sst2 att_interp maneuver gps_data_gap st_blinding other
flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
valid_min: 0
valid_max: 10
origname: podppd_flag
fullnamepath: /gt1r/geolocation/podppd_flag
coordinates: gt1r_geolocation_delta_time
gt1r_geolocation_velocity_sc: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895][ds_xyz = 0..2]
_FillValue: 3.402823466e+38
units: meters/second
long_name: spacecraft velocity
description: Spacecraft velocity components (east component, north component, up component) an observer on the ground would measure. While values are common to all beams, this parameter is naturally produced as part of geolocation.
source: ATL03G ATBD
origname: velocity_sc
fullnamepath: /gt1r/geolocation/velocity_sc
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_segment_id: Array of 32 bit Integers [gt1r_geolocation_delta_time = 0..149895]
units: 1
contentType: referenceInformation
long_name: along-track segment ID number.
description: A 7 digit number identifiying the along-track geolocation segment number. These are sequential, starting with 1 for the first segment after an ascending equatorial crossing node.
source: ATL03 ATBD, Section 3.1
origname: segment_id
fullnamepath: /gt1r/geolocation/segment_id
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_reference_photon_lat: Array of 64 bit Reals [gt1r_geolocation_delta_time = 0..149895]
units: degrees_north
long_name: Segment Latitude
standard_name: latitude
description: Latitude of each reference photon. Computed from the ECF Cartesian coordinates of the bounce point. In the case of no photons within the segment (segment_ph_cnt=0), the coordinates are the midpoint of the geolocation segment on the reference ground track.
source: ATL03G ATBD, Section 3.4
valid_min: -90.000000000000000
valid_max: 90.000000000000000
origname: reference_photon_lat
fullnamepath: /gt1r/geolocation/reference_photon_lat
coordinates: gt1r_geolocation_delta_time
gt1r_geolocation_solar_elevation: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: degrees
long_name: solar elevation
description: The elevation of the sun position vector from the reference photon bounce point position in the local ENU frame. The angle is measured from the East-North plane and is positive Up. ATL03g provides this value in radians; it is converted to degress for ATL03 output.
source: ATL03G ATBD, Section 3.3
origname: solar_elevation
fullnamepath: /gt1r/geolocation/solar_elevation
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_bounce_time_offset: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: seconds
long_name: ground bounce time offset
description: The difference between the transmit time and the ground bounce time of the reference photons.
source: ATL03 ATBD, Section 3.3
origname: bounce_time_offset
fullnamepath: /gt1r/geolocation/bounce_time_offset
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_reference_photon_index: Array of 32 bit Integers [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 0
units: counts
long_name: Reference Photon Index
description: Index of the reference photon within the set of photons grouped within in segment. To recover the position of the reference photon within the photon-rate arrays, add ref_ph_ndx to the corresponding ph_ndx_beg and subtract 1. If no reference photon was selected, this value will indicate that the reference photon defaulted to the first photon. In the case of no photons within the segment (segment_ph_cnt=0), the value should be 0.
source: ATL03 ATBD, Section 3.2
origname: reference_photon_index
fullnamepath: /gt1r/geolocation/reference_photon_index
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_altitude_sc: Array of 64 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 1.7976931348623157e+308
units: meters
long_name: Altitude
description: Height of the spacecraft above the WGS84 ellipsoid.
source: ATL03g ATBD, Section 3.4
origname: altitude_sc
fullnamepath: /gt1r/geolocation/altitude_sc
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_segment_dist_x: Array of 64 bit Reals [gt1r_geolocation_delta_time = 0..149895]
units: meters
long_name: Segment Distance from EQC
description: Along-track distance from the equator crossing to the start of the 20 meter geolocation segment.
source: Derived
origname: segment_dist_x
fullnamepath: /gt1r/geolocation/segment_dist_x
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geolocation_neutat_delay_total: Array of 32 bit Reals [gt1r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Total Neutral Atmospheric Delay
description: Total neutral atmosphere delay correction (wet+dry).
source: ATL03a ATBD
origname: neutat_delay_total
fullnamepath: /gt1r/geolocation/neutat_delay_total
coordinates: gt1r_geolocation_delta_time gt1r_geolocation_reference_photon_lat gt1r_geolocation_reference_photon_lon
gt1r_geophys_corr_tide_oc_pole: Array of 32 bit Reals [gt1r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Ocean Pole Tide
description: Surface deformation of the Earth due to loading from the centrifugal effect of polar motion upon the oceans (-2 to 2 mm).
source: ATL03 ATBD, Section 6.3.6
origname: tide_oc_pole
fullnamepath: /gt1r/geophys_corr/tide_oc_pole
coordinates: gt1r_geophys_corr_delta_time
gt1r_geophys_corr_dem_flag: Array of 16 bit Integers [gt1r_geophys_corr_delta_time = 0..149895]
_FillValue: 127
units: 1
contentType: referenceInformation
long_name: dem source flag
description: Indicates source of the DEM height. Values: 0=None, 1=Arctic, 2=GMTED, 3=MSS, 4=Antarctic.
source: ATL03 ATBD Section 6.3
flag_meanings: none arctic gmted mss antarctic
flag_values: 0, 1, 2, 3, 4
valid_min: 0
valid_max: 4
origname: dem_flag
fullnamepath: /gt1r/geophys_corr/dem_flag
coordinates: gt1r_geophys_corr_delta_time
gt1r_geophys_corr_tide_ocean: Array of 32 bit Reals [gt1r_geophys_corr_delta_time = 0..149895]
long_name: Ocean Tide
_FillValue: 3.402823466e+38
units: meters
description: Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium). This correction is not applied to the photon heights and provided only as supplemental information.
source: ATL03 ATBD, Section 6.3.1
origname: tide_ocean
fullnamepath: /gt1r/geophys_corr/tide_ocean
coordinates: gt1r_geophys_corr_delta_time
gt1r_geophys_corr_tide_earth: Array of 32 bit Reals [gt1r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Earth Tide
description: Solid Earth Tides
source: ATL03 ATBD, Section 6.3.3
origname: tide_earth
fullnamepath: /gt1r/geophys_corr/tide_earth
coordinates: gt1r_geophys_corr_delta_time
gt1r_geophys_corr_dac: Array of 32 bit Reals [gt1r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Dynamic Atmosphere Correction
description: Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect. This correction is not applied to the photon heights and provided only as supplemental information.
source: ATL03 ATBD, Section 6.3.2
origname: dac
fullnamepath: /gt1r/geophys_corr/dac
coordinates: gt1r_geophys_corr_delta_time
gt1r_geophys_corr_tide_load: Array of 32 bit Reals [gt1r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Load Tide
description: Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm).
source: ATL03 ATBD, Section 6.3.4
origname: tide_load
fullnamepath: /gt1r/geophys_corr/tide_load
coordinates: gt1r_geophys_corr_delta_time
gt1r_geophys_corr_dem_h: Array of 32 bit Reals [gt1r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
contentType: referenceInformation
long_name: DEM Height
description: Best available DEM (in priority of Arctic/Antarctic/GMTED/MSS) value at the location of the reference photon.
source: ATL03 ATBD Section 6.3
origname: dem_h
fullnamepath: /gt1r/geophys_corr/dem_h
coordinates: gt1r_geophys_corr_delta_time
gt1r_geophys_corr_tide_equilibrium: Array of 32 bit Reals [gt1r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
contentType: referenceInformation
long_name: Long Period Equilibrium Tide
description: Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). This correction is not applied to the photon heights and is provided only as a supplemental information.
source: ATL03 ATBD, Section 6.3.1
origname: tide_equilibrium
fullnamepath: /gt1r/geophys_corr/tide_equilibrium
coordinates: gt1r_geophys_corr_delta_time
gt1r_geophys_corr_geoid: Array of 32 bit Reals [gt1r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Geoid
description: Geoid height above WGS-84 reference ellipsoid (range -107 to 86m). Not applied on the product; requested by higher-level products.
source: ATL03 ATBD, Section 6.3.8
origname: geoid
fullnamepath: /gt1r/geophys_corr/geoid
coordinates: gt1r_geophys_corr_delta_time
gt1r_geophys_corr_tide_pole: Array of 32 bit Reals [gt1r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Solid Earth Pole Tide
description: Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm).
source: ATL03 ATBD, Section 6.3.5
origname: tide_pole
fullnamepath: /gt1r/geophys_corr/tide_pole
coordinates: gt1r_geophys_corr_delta_time
gt1r_signal_find_output_ocean_bckgrd_mean: Array of 32 bit Reals [gt1r_signal_find_output_ocean_delta_time = 0..72818]
_FillValue: 3.402823466e+38
units: counts
long_name: background counts per bin
description: The mean of the number of background counts expected in one height bin of the histogram of width dzATM over time period, dtATM
source: ATL03 ATBD, Section 5
origname: bckgrd_mean
fullnamepath: /gt1r/signal_find_output/ocean/bckgrd_mean
coordinates: gt1r_signal_find_output_ocean_delta_time
gt1r_signal_find_output_ocean_bckgrd_sigma: Array of 32 bit Reals [gt1r_signal_find_output_ocean_delta_time = 0..72818]
_FillValue: 3.402823466e+38
units: counts
long_name: background counts per bin sigma
description: The standard deviation of the number of background counts expected in one height bin of the histogram of width dzATM over time period, dtATM
source: ATL03 ATBD, Section 5
origname: bckgrd_sigma
fullnamepath: /gt1r/signal_find_output/ocean/bckgrd_sigma
coordinates: gt1r_signal_find_output_ocean_delta_time
gt1r_signal_find_output_ocean_t_pc_delta: Array of 32 bit Reals [gt1r_signal_find_output_ocean_delta_time = 0..72818]
_FillValue: 3.402823466e+38
units: seconds
long_name: bin width size
description: The histogram bin width (integration time) along-track used to find signal photons.
source: ATL03 ATBD, Section 5
origname: t_pc_delta
fullnamepath: /gt1r/signal_find_output/ocean/t_pc_delta
coordinates: gt1r_signal_find_output_ocean_delta_time
gt1r_signal_find_output_ocean_z_pc_delta: Array of 32 bit Reals [gt1r_signal_find_output_ocean_delta_time = 0..72818]
_FillValue: 3.402823466e+38
units: meters
long_name: bin height size
description: Height bin size of the histogram used to find signal photons.
source: ATL03 ATBD, Section 5
origname: z_pc_delta
fullnamepath: /gt1r/signal_find_output/ocean/z_pc_delta
coordinates: gt1r_signal_find_output_ocean_delta_time
gt1r_heights_ph_id_count: Array of 16 bit Integers [gt1r_heights_delta_time = 0..1319586]
units: counts
long_name: photon event counter
description: The photon event counter is part of photon ID and counts from 1 for each channel until reset by laser pulse counter.
source: Derived as part of Photon ID
contentType: referenceInformation
origname: ph_id_count
fullnamepath: /gt1r/heights/ph_id_count
coordinates: gt1r_heights_delta_time gt1r_heights_lat_ph gt1r_heights_lon_ph
gt1r_heights_lat_ph: Array of 64 bit Reals [gt1r_heights_delta_time = 0..1319586]
units: degrees_north
long_name: Latitude
standard_name: latitude
description: Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point.
source: ATL03g ATBD, Section 3.4
valid_min: -90.000000000000000
valid_max: 90.000000000000000
origname: lat_ph
fullnamepath: /gt1r/heights/lat_ph
coordinates: gt1r_heights_delta_time gt1r_heights_lon_ph
gt1r_heights_dist_ph_along: Array of 32 bit Reals [gt1r_heights_delta_time = 0..1319586]
units: meters
long_name: Distance from equator crossing.
description: Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack.
source: ATL03 ATBD, Section 3.1
origname: dist_ph_along
fullnamepath: /gt1r/heights/dist_ph_along
coordinates: gt1r_heights_delta_time gt1r_heights_lat_ph gt1r_heights_lon_ph
gt1r_heights_signal_conf_ph: Array of 16 bit Integers [gt1r_heights_delta_time = 0..1319586][ds_surf_type = 0..4]
units: 1
contentType: qualityInformation
long_name: Photon Signal Confidence
description: Confidence level associated with each photon event selected as signal. 0=noise. 1=added to allow for buffer but algorithm classifies as background; 2=low; 3=med; 4=high). This parameter is a 5xN array where N is the number of photons in the granule, and the 5 rows indicate signal finding for each surface type (in order: land, ocean, sea ice, land ice and inland water). Events not associated with a specific surface type have a confidence level of -1. Events evaluated as TEP returns have a confidence level of -2.
source: ATL03 ATBD, Section 5, Conf
flag_meanings: possible_tep not_considered noise buffer low medium high
flag_values: -2, -1, 0, 1, 2, 3, 4
valid_min: -2
valid_max: 4
origname: signal_conf_ph
fullnamepath: /gt1r/heights/signal_conf_ph
coordinates: gt1r_heights_delta_time gt1r_heights_lat_ph gt1r_heights_lon_ph
gt1r_heights_ph_id_pulse: Array of Bytes [gt1r_heights_delta_time = 0..1319586]
units: counts
contentType: referenceInformation
long_name: laser pulse counter
description: The laser pulse counter is part of photon ID and counts from 1 to 200 and is reset for each new major frame.
source: Derived as part of Photon ID
origname: ph_id_pulse
fullnamepath: /gt1r/heights/ph_id_pulse
coordinates: gt1r_heights_delta_time gt1r_heights_lat_ph gt1r_heights_lon_ph
gt1r_heights_h_ph: Array of 32 bit Reals [gt1r_heights_delta_time = 0..1319586]
units: meters
contentType: physicalMeasurement
long_name: Photon WGS84 Height
standard_name: height
description: Height of each received photon, relative to the WGS-84 ellipsoid including the geophysical corrections noted in Section 6. Please note that neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights.
source: ATL03g ATBD, Section 3.4
origname: h_ph
fullnamepath: /gt1r/heights/h_ph
coordinates: gt1r_heights_delta_time gt1r_heights_lat_ph gt1r_heights_lon_ph
gt1r_heights_ph_id_channel: Array of Bytes [gt1r_heights_delta_time = 0..1319586]
units: 1
contentType: referenceInformation
long_name: Receive channel id
description: Channel number assigned for each received photon event. This is part of the photon ID. Values range from 1 to 120 to span all channels and rise/fall edges. Values 1 to 60 are for falling edge; PCE1 (1 to 20), PCE 2 (21 to 40) and PCE3 (41 to 60). Values 61 to 120 are for rising edge; PCE1 (61 to 80), PCE 2 (81 to 100) and PC3 (101 to 120).
source: Derived as part of Photon ID
valid_min: 1
valid_max: 120
origname: ph_id_channel
fullnamepath: /gt1r/heights/ph_id_channel
coordinates: gt1r_heights_delta_time gt1r_heights_lat_ph gt1r_heights_lon_ph
gt1r_heights_lon_ph: Array of 64 bit Reals [gt1r_heights_delta_time = 0..1319586]
units: degrees_east
long_name: Longitude
standard_name: longitude
description: Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point.
source: ATL03g ATBD, Section 3.4
valid_min: -180.00000000000000
valid_max: 180.00000000000000
origname: lon_ph
fullnamepath: /gt1r/heights/lon_ph
coordinates: gt1r_heights_delta_time gt1r_heights_lat_ph
gt1r_heights_pce_mframe_cnt: Array of 32 bit Unsigned integers [gt1r_heights_delta_time = 0..1319586]
units: counts
contentType: referenceInformation
long_name: PCE Major frame counter
description: The major frame counter is read from the digital flow controller in a given PCE card. The counter identifies individual major frames across diag and science packets. Used as part of the photon ID.
source: Retained from prior a_alt_science_ph packet
origname: pce_mframe_cnt
fullnamepath: /gt1r/heights/pce_mframe_cnt
coordinates: gt1r_heights_delta_time gt1r_heights_lat_ph gt1r_heights_lon_ph
gt1r_heights_dist_ph_across: Array of 32 bit Reals [gt1r_heights_delta_time = 0..1319586]
units: meters
long_name: Distance off RGT.
description: Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1.
source: ATL03 ATBD, Section 3.1
origname: dist_ph_across
fullnamepath: /gt1r/heights/dist_ph_across
coordinates: gt1r_heights_delta_time gt1r_heights_lat_ph gt1r_heights_lon_ph
gt2r_bckgrd_atlas_bckgrd_int_height: Array of 32 bit Reals [gt2r_bckgrd_atlas_delta_time = 0..84047]
units: meters
contentType: modelResult
long_name: Altimetric range window width
description: The height of the altimetric range window. This is the height over which the 50-shot sum is generated. Parameter is ingested at 50-Hz, and values are repeated to form a 200-Hz array.
source: ATL03 ATBD Section 7.3
origname: bckgrd_int_height
fullnamepath: /gt2r/bckgrd_atlas/bckgrd_int_height
coordinates: gt2r_bckgrd_atlas_delta_time
gt2r_bckgrd_atlas_tlm_height_band1: Array of 32 bit Reals [gt2r_bckgrd_atlas_delta_time = 0..84047]
units: meters
description: The height in meters of the telemetry band 1.
source: ATL03 ATBD, Section 7.3.2
long_name: Height of the telemetry band 1
origname: tlm_height_band1
fullnamepath: /gt2r/bckgrd_atlas/tlm_height_band1
coordinates: gt2r_bckgrd_atlas_delta_time
gt2r_bckgrd_atlas_bckgrd_rate: Array of 32 bit Reals [gt2r_bckgrd_atlas_delta_time = 0..84047]
units: counts / second
contentType: modelResult
long_name: Background count rate based on the ATLAS 50-shot sum
description: The background count rate from the 50-shot altimetric histogram after removing the number of likely signal photons based on Section 5.
source: ATL03 ATBD Section 7.3
origname: bckgrd_rate
fullnamepath: /gt2r/bckgrd_atlas/bckgrd_rate
coordinates: gt2r_bckgrd_atlas_delta_time
gt2r_bckgrd_atlas_tlm_top_band1: Array of 32 bit Reals [gt2r_bckgrd_atlas_delta_time = 0..84047]
units: meters
long_name: Ellipsoidal height of the top of the telemetry band 1.
description: The ellipsoidal heights with respect to WGS-84 of the top of the telemetry band 1, with all geophysical corrections applied.
source: ATL03 ATBD, Section 3.2, 7.3.2
origname: tlm_top_band1
fullnamepath: /gt2r/bckgrd_atlas/tlm_top_band1
coordinates: gt2r_bckgrd_atlas_delta_time
gt2r_bckgrd_atlas_tlm_top_band2: Array of 32 bit Reals [gt2r_bckgrd_atlas_delta_time = 0..84047]
units: meters
long_name: Ellipsoidal height of the top of the telemetry band 2.
description: The ellipsoidal heights with respect to WGS-84 of the top of the telemetry band 2, with all geophysical corrections applied.
source: ATL03 ATBD, Section 3.2, 7.3.2
origname: tlm_top_band2
fullnamepath: /gt2r/bckgrd_atlas/tlm_top_band2
coordinates: gt2r_bckgrd_atlas_delta_time
gt2r_bckgrd_atlas_bckgrd_int_height_reduced: Array of 32 bit Reals [gt2r_bckgrd_atlas_delta_time = 0..84047]
units: meters
contentType: modelResult
long_name: Altimetric range window height - reduced
description: The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span.
source: ATL03 ATBD Section 7.3
origname: bckgrd_int_height_reduced
fullnamepath: /gt2r/bckgrd_atlas/bckgrd_int_height_reduced
coordinates: gt2r_bckgrd_atlas_delta_time
gt2r_bckgrd_atlas_bckgrd_hist_top: Array of 32 bit Reals [gt2r_bckgrd_atlas_delta_time = 0..84047]
units: meters
contentType: modelResult
long_name: Top of the altimetric range window
description: The height of the top of the altimetric histogram, in meters above the WGS-84 ellipsoid, with all geophysical corrections applied. Parameter is ingested at 50-Hz, and values are repeated to form a 200-Hz array.
source: ATL03 ATBD Section 7.3
origname: bckgrd_hist_top
fullnamepath: /gt2r/bckgrd_atlas/bckgrd_hist_top
coordinates: gt2r_bckgrd_atlas_delta_time
gt2r_bckgrd_atlas_bckgrd_counts_reduced: Array of 32 bit Integers [gt2r_bckgrd_atlas_delta_time = 0..84047]
units: counts
contentType: modelResult
long_name: ATLAS 50-shot background count - reduced
description: Number of photon counts in the 50-shot sum after subtracting the number of signal photon events, defined as in ATBD Section 5, in that span.
source: ATL03 ATBD Section 7.3
origname: bckgrd_counts_reduced
fullnamepath: /gt2r/bckgrd_atlas/bckgrd_counts_reduced
coordinates: gt2r_bckgrd_atlas_delta_time
gt2r_bckgrd_atlas_tlm_height_band2: Array of 32 bit Reals [gt2r_bckgrd_atlas_delta_time = 0..84047]
units: meters
long_name: Height of the telemetry band 2
description: The height in meters of the telemetry band 2. (if 0, second band is not present).
source: ATL03 ATBD, Section 7.3.2
origname: tlm_height_band2
fullnamepath: /gt2r/bckgrd_atlas/tlm_height_band2
coordinates: gt2r_bckgrd_atlas_delta_time
gt2r_bckgrd_atlas_bckgrd_counts: Array of 32 bit Integers [gt2r_bckgrd_atlas_delta_time = 0..84047]
units: counts
contentType: modelResult
long_name: ATLAS 50-shot background count
description: Onboard 50 shot background (200 Hz) sum of photon events within the altimetric range window.
source: ATL03 ATBD Section 7.3
origname: bckgrd_counts
fullnamepath: /gt2r/bckgrd_atlas/bckgrd_counts
coordinates: gt2r_bckgrd_atlas_delta_time
gt2r_geolocation_segment_ph_cnt: Array of 32 bit Integers [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 0
units: counts
long_name: Number of photons
description: Number of photons in a given along-track segment. In the case of no photons within the segment (segment_ph_cnt=0), most other parameters are filled with invalid or best-estimate values. Maintaining geolocation segments with no photons allows for the geolocation segment arrays to be directly aligned across the gtx groups.
source: Derived
origname: segment_ph_cnt
fullnamepath: /gt2r/geolocation/segment_ph_cnt
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_segment_length: Array of 64 bit Reals [gt2r_geolocation_delta_time = 0..149895]
units: meters
long_name: along-track segment length
description: The along-track length of the along-track segment. Nominally these are 20m, but they vary from 19.8m to 20.2m.
source: ATL03 ATBD, Section 3.1
origname: segment_length
fullnamepath: /gt2r/geolocation/segment_length
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_range_bias_corr: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
long_name: range bias correction
description: The range_bias estimated from geolocation analysis.
source: ATL03G ATBD, Section 3.6
_FillValue: 3.402823466e+38
units: meters
origname: range_bias_corr
fullnamepath: /gt2r/geolocation/range_bias_corr
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_neutat_delay_derivative: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters/meters
long_name: (Neutral Atmosphere delay)/dh
description: Change in neutral atmospheric delay per height change
source: ATL03a ATBD
origname: neutat_delay_derivative
fullnamepath: /gt2r/geolocation/neutat_delay_derivative
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_reference_photon_lon: Array of 64 bit Reals [gt2r_geolocation_delta_time = 0..149895]
units: degrees_east
long_name: Segment Longitude
standard_name: longitude
description: Longitude of each reference photon. Computed from the ECF Cartesian coordinates of the bounce point. In the case of no photons within the segment (segment_ph_cnt=0), the coordinates are the midpoint of the geolocation segment on the reference ground track.
source: ATL03G ATBD, Section 3.4
valid_min: -180.00000000000000
valid_max: 180.00000000000000
origname: reference_photon_lon
fullnamepath: /gt2r/geolocation/reference_photon_lon
coordinates: gt2r_geolocation_delta_time
gt2r_geolocation_sigma_across: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: across-track geolocation uncertainty
description: Estimated Cartesian across-track uncertainity (1-sigma) for the refrerence photon
source: ATL03G ATBD
origname: sigma_across
fullnamepath: /gt2r/geolocation/sigma_across
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_sigma_lon: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: degrees
long_name: longitude uncertainty
description: Estimated geodetic east Longitude uncertainty (1-sigma), for the reference photon bounce point.
source: ATL03G ATBD, Section 3.6
origname: sigma_lon
fullnamepath: /gt2r/geolocation/sigma_lon
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_ref_azimuth: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: radians
long_name: Azimuth
standard_name: azimuth
description: Azimuth of the unit pointing vector for the reference photon in the local ENU frame in radians. The angle is measured from North and positive towards East.
source: ATL03G ATBD, Section 3.3
origname: ref_azimuth
fullnamepath: /gt2r/geolocation/ref_azimuth
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_ref_elev: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: radians
long_name: elevation
standard_name: elevation
description: Elevation of the unit pointing vector for the reference photon in the local ENU frame in radians. The angle is measured from East-North plane and positive towards Up
source: ATL03G ATBD, Section 3.3
origname: ref_elev
fullnamepath: /gt2r/geolocation/ref_elev
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_neutat_ht: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Neutral atmosphere ref height
description: Reference height of the neutral atmosphere range correction
source: ATL03a ATBD
origname: neutat_ht
fullnamepath: /gt2r/geolocation/neutat_ht
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_solar_azimuth: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: degrees_east
long_name: solar azimuth
description: The azimuth of the sun position vector from the reference photon bounce point position in the local ENU frame. The angle is measured from North and is positive towards East. ATL03g provides this value in radians; it is converted to degrees for ATL03 output.
source: ATL03G ATBD, Section 3.3
origname: solar_azimuth
fullnamepath: /gt2r/geolocation/solar_azimuth
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_surf_type: Array of 16 bit Integers [gt2r_geolocation_delta_time = 0..149895][ds_surf_type = 0..4]
units: 1
contentType: referenceInformation
long_name: Surface Type
description: Flags describing which surface types this interval is associated with. 0=not type, 1=is type. Order of array is land, ocean, sea ice, land ice, inland water.
source: ATL03 ATBD, Section 4
flag_meanings: not_type is_type
flag_values: 0, 1
valid_min: 0
valid_max: 1
origname: surf_type
fullnamepath: /gt2r/geolocation/surf_type
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_sigma_lat: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: 1
long_name: latitude uncertainty
description: Estimated geodetic Latitude uncertainty (1-sigma), for the reference photon bounce point.
source: ATL03G ATBD, Section 3.6
origname: sigma_lat
fullnamepath: /gt2r/geolocation/sigma_lat
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_tx_pulse_width_lower: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: seconds
long_name: Transmit Pulse Energy Lower Width
description: The average distance between the lower threshold crossing times measured by the Start Pulse Detector.
source: ATL02 ATBD, Section 7.2
origname: tx_pulse_width_lower
fullnamepath: /gt2r/geolocation/tx_pulse_width_lower
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_sigma_along: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: along-track geolocation uncertainity
description: Estimated cartesian along-track uncertainanty (1-sigma) for the reference photon
source: ATL03G ATBD
origname: sigma_along
fullnamepath: /gt2r/geolocation/sigma_along
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_tx_pulse_skew_est: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: seconds
long_name: Transmit Pulse Skew Estimate
description: The difference between the averages of the lower and upper threshold crossing times. This is an estimate of the transmit pulse skew.
source: ATL02 ATBD, Section 7.2
origname: tx_pulse_skew_est
fullnamepath: /gt2r/geolocation/tx_pulse_skew_est
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_tx_pulse_energy: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: Joules
contentType: physicalMeasurement
long_name: Transmit Pulse Energy
description: The average transmit pulse energy, measured by the internal laser energy monitor, split into per-beam measurements.
source: ATL02 ATBD, Section 7.2
origname: tx_pulse_energy
fullnamepath: /gt2r/geolocation/tx_pulse_energy
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_tx_pulse_width_upper: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: seconds
long_name: Transmit Pulse Energy Upper Width
description: The average distance between the upper threshold crossing times measured by the Start Pulse Detector.
source: ATL02 ATBD, Section 7.2
origname: tx_pulse_width_upper
fullnamepath: /gt2r/geolocation/tx_pulse_width_upper
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_sigma_h: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: 1
long_name: height uncertainty
description: Estimated height uncertainty (1-sigma) for the reference photon bounce point.
source: ATL03G ATBD, Section 3.6
origname: sigma_h
fullnamepath: /gt2r/geolocation/sigma_h
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_podppd_flag: Array of 16 bit Integers [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 0
units: 1
long_name: POD_PPD Flag
description: Composite POD/PPD flag that indicates the quality of input geolocation products for the specific ATL03 segment. A non-zero value may indicate that geolocation solutions are degraded. The ATL03 sigma values should indicate the degree of uncertainty associated with the degredation. Possible values are: 0=NOMINAL; 1=LRS; 2=LASERS; 3=GYRO; 4=SST1; 5=SST2; 6=ATT_INTERP; 7=MANEUVER; 8=GPS_DATA_GAP; 9-ST_BLINDING; 10=OTHER. Values 1-6 (PPD) are prioritized over values 7-10 (POD). In the case where both POD and PPD report an error, only the PAD value is indicated.
source: ANC04, ANC05
flag_meanings: nominal lrs lasers gyro sst1 sst2 att_interp maneuver gps_data_gap st_blinding other
flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
valid_min: 0
valid_max: 10
origname: podppd_flag
fullnamepath: /gt2r/geolocation/podppd_flag
coordinates: gt2r_geolocation_delta_time
gt2r_geolocation_velocity_sc: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895][ds_xyz = 0..2]
_FillValue: 3.402823466e+38
units: meters/second
long_name: spacecraft velocity
description: Spacecraft velocity components (east component, north component, up component) an observer on the ground would measure. While values are common to all beams, this parameter is naturally produced as part of geolocation.
source: ATL03G ATBD
origname: velocity_sc
fullnamepath: /gt2r/geolocation/velocity_sc
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_segment_id: Array of 32 bit Integers [gt2r_geolocation_delta_time = 0..149895]
units: 1
contentType: referenceInformation
long_name: along-track segment ID number.
description: A 7 digit number identifiying the along-track geolocation segment number. These are sequential, starting with 1 for the first segment after an ascending equatorial crossing node.
source: ATL03 ATBD, Section 3.1
origname: segment_id
fullnamepath: /gt2r/geolocation/segment_id
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_reference_photon_lat: Array of 64 bit Reals [gt2r_geolocation_delta_time = 0..149895]
units: degrees_north
long_name: Segment Latitude
standard_name: latitude
description: Latitude of each reference photon. Computed from the ECF Cartesian coordinates of the bounce point. In the case of no photons within the segment (segment_ph_cnt=0), the coordinates are the midpoint of the geolocation segment on the reference ground track.
source: ATL03G ATBD, Section 3.4
valid_min: -90.000000000000000
valid_max: 90.000000000000000
origname: reference_photon_lat
fullnamepath: /gt2r/geolocation/reference_photon_lat
coordinates: gt2r_geolocation_delta_time
gt2r_geolocation_solar_elevation: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: degrees
long_name: solar elevation
description: The elevation of the sun position vector from the reference photon bounce point position in the local ENU frame. The angle is measured from the East-North plane and is positive Up. ATL03g provides this value in radians; it is converted to degress for ATL03 output.
source: ATL03G ATBD, Section 3.3
origname: solar_elevation
fullnamepath: /gt2r/geolocation/solar_elevation
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_bounce_time_offset: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: seconds
long_name: ground bounce time offset
description: The difference between the transmit time and the ground bounce time of the reference photons.
source: ATL03 ATBD, Section 3.3
origname: bounce_time_offset
fullnamepath: /gt2r/geolocation/bounce_time_offset
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_reference_photon_index: Array of 32 bit Integers [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 0
units: counts
long_name: Reference Photon Index
description: Index of the reference photon within the set of photons grouped within in segment. To recover the position of the reference photon within the photon-rate arrays, add ref_ph_ndx to the corresponding ph_ndx_beg and subtract 1. If no reference photon was selected, this value will indicate that the reference photon defaulted to the first photon. In the case of no photons within the segment (segment_ph_cnt=0), the value should be 0.
source: ATL03 ATBD, Section 3.2
origname: reference_photon_index
fullnamepath: /gt2r/geolocation/reference_photon_index
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_altitude_sc: Array of 64 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 1.7976931348623157e+308
units: meters
long_name: Altitude
description: Height of the spacecraft above the WGS84 ellipsoid.
source: ATL03g ATBD, Section 3.4
origname: altitude_sc
fullnamepath: /gt2r/geolocation/altitude_sc
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_segment_dist_x: Array of 64 bit Reals [gt2r_geolocation_delta_time = 0..149895]
units: meters
long_name: Segment Distance from EQC
description: Along-track distance from the equator crossing to the start of the 20 meter geolocation segment.
source: Derived
origname: segment_dist_x
fullnamepath: /gt2r/geolocation/segment_dist_x
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geolocation_neutat_delay_total: Array of 32 bit Reals [gt2r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Total Neutral Atmospheric Delay
description: Total neutral atmosphere delay correction (wet+dry).
source: ATL03a ATBD
origname: neutat_delay_total
fullnamepath: /gt2r/geolocation/neutat_delay_total
coordinates: gt2r_geolocation_delta_time gt2r_geolocation_reference_photon_lat gt2r_geolocation_reference_photon_lon
gt2r_geophys_corr_tide_oc_pole: Array of 32 bit Reals [gt2r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Ocean Pole Tide
description: Surface deformation of the Earth due to loading from the centrifugal effect of polar motion upon the oceans (-2 to 2 mm).
source: ATL03 ATBD, Section 6.3.6
origname: tide_oc_pole
fullnamepath: /gt2r/geophys_corr/tide_oc_pole
coordinates: gt2r_geophys_corr_delta_time
gt2r_geophys_corr_dem_flag: Array of 16 bit Integers [gt2r_geophys_corr_delta_time = 0..149895]
_FillValue: 127
units: 1
contentType: referenceInformation
long_name: dem source flag
description: Indicates source of the DEM height. Values: 0=None, 1=Arctic, 2=GMTED, 3=MSS, 4=Antarctic.
source: ATL03 ATBD Section 6.3
flag_meanings: none arctic gmted mss antarctic
flag_values: 0, 1, 2, 3, 4
valid_min: 0
valid_max: 4
origname: dem_flag
fullnamepath: /gt2r/geophys_corr/dem_flag
coordinates: gt2r_geophys_corr_delta_time
gt2r_geophys_corr_tide_ocean: Array of 32 bit Reals [gt2r_geophys_corr_delta_time = 0..149895]
long_name: Ocean Tide
_FillValue: 3.402823466e+38
units: meters
description: Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium). This correction is not applied to the photon heights and provided only as supplemental information.
source: ATL03 ATBD, Section 6.3.1
origname: tide_ocean
fullnamepath: /gt2r/geophys_corr/tide_ocean
coordinates: gt2r_geophys_corr_delta_time
gt2r_geophys_corr_tide_earth: Array of 32 bit Reals [gt2r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Earth Tide
description: Solid Earth Tides
source: ATL03 ATBD, Section 6.3.3
origname: tide_earth
fullnamepath: /gt2r/geophys_corr/tide_earth
coordinates: gt2r_geophys_corr_delta_time
gt2r_geophys_corr_dac: Array of 32 bit Reals [gt2r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Dynamic Atmosphere Correction
description: Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect. This correction is not applied to the photon heights and provided only as supplemental information.
source: ATL03 ATBD, Section 6.3.2
origname: dac
fullnamepath: /gt2r/geophys_corr/dac
coordinates: gt2r_geophys_corr_delta_time
gt2r_geophys_corr_tide_load: Array of 32 bit Reals [gt2r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Load Tide
description: Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm).
source: ATL03 ATBD, Section 6.3.4
origname: tide_load
fullnamepath: /gt2r/geophys_corr/tide_load
coordinates: gt2r_geophys_corr_delta_time
gt2r_geophys_corr_dem_h: Array of 32 bit Reals [gt2r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
contentType: referenceInformation
long_name: DEM Height
description: Best available DEM (in priority of Arctic/Antarctic/GMTED/MSS) value at the location of the reference photon.
source: ATL03 ATBD Section 6.3
origname: dem_h
fullnamepath: /gt2r/geophys_corr/dem_h
coordinates: gt2r_geophys_corr_delta_time
gt2r_geophys_corr_tide_equilibrium: Array of 32 bit Reals [gt2r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
contentType: referenceInformation
long_name: Long Period Equilibrium Tide
description: Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). This correction is not applied to the photon heights and is provided only as a supplemental information.
source: ATL03 ATBD, Section 6.3.1
origname: tide_equilibrium
fullnamepath: /gt2r/geophys_corr/tide_equilibrium
coordinates: gt2r_geophys_corr_delta_time
gt2r_geophys_corr_geoid: Array of 32 bit Reals [gt2r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Geoid
description: Geoid height above WGS-84 reference ellipsoid (range -107 to 86m). Not applied on the product; requested by higher-level products.
source: ATL03 ATBD, Section 6.3.8
origname: geoid
fullnamepath: /gt2r/geophys_corr/geoid
coordinates: gt2r_geophys_corr_delta_time
gt2r_geophys_corr_tide_pole: Array of 32 bit Reals [gt2r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Solid Earth Pole Tide
description: Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm).
source: ATL03 ATBD, Section 6.3.5
origname: tide_pole
fullnamepath: /gt2r/geophys_corr/tide_pole
coordinates: gt2r_geophys_corr_delta_time
gt2r_signal_find_output_ocean_bckgrd_mean: Array of 32 bit Reals [gt2r_signal_find_output_ocean_delta_time = 0..72106]
_FillValue: 3.402823466e+38
units: counts
long_name: background counts per bin
description: The mean of the number of background counts expected in one height bin of the histogram of width dzATM over time period, dtATM
source: ATL03 ATBD, Section 5
origname: bckgrd_mean
fullnamepath: /gt2r/signal_find_output/ocean/bckgrd_mean
coordinates: gt2r_signal_find_output_ocean_delta_time
gt2r_signal_find_output_ocean_bckgrd_sigma: Array of 32 bit Reals [gt2r_signal_find_output_ocean_delta_time = 0..72106]
_FillValue: 3.402823466e+38
units: counts
long_name: background counts per bin sigma
description: The standard deviation of the number of background counts expected in one height bin of the histogram of width dzATM over time period, dtATM
source: ATL03 ATBD, Section 5
origname: bckgrd_sigma
fullnamepath: /gt2r/signal_find_output/ocean/bckgrd_sigma
coordinates: gt2r_signal_find_output_ocean_delta_time
gt2r_signal_find_output_ocean_t_pc_delta: Array of 32 bit Reals [gt2r_signal_find_output_ocean_delta_time = 0..72106]
_FillValue: 3.402823466e+38
units: seconds
long_name: bin width size
description: The histogram bin width (integration time) along-track used to find signal photons.
source: ATL03 ATBD, Section 5
origname: t_pc_delta
fullnamepath: /gt2r/signal_find_output/ocean/t_pc_delta
coordinates: gt2r_signal_find_output_ocean_delta_time
gt2r_signal_find_output_ocean_z_pc_delta: Array of 32 bit Reals [gt2r_signal_find_output_ocean_delta_time = 0..72106]
_FillValue: 3.402823466e+38
units: meters
long_name: bin height size
description: Height bin size of the histogram used to find signal photons.
source: ATL03 ATBD, Section 5
origname: z_pc_delta
fullnamepath: /gt2r/signal_find_output/ocean/z_pc_delta
coordinates: gt2r_signal_find_output_ocean_delta_time
gt2r_heights_ph_id_count: Array of 16 bit Integers [gt2r_heights_delta_time = 0..1043505]
units: counts
long_name: photon event counter
description: The photon event counter is part of photon ID and counts from 1 for each channel until reset by laser pulse counter.
source: Derived as part of Photon ID
contentType: referenceInformation
origname: ph_id_count
fullnamepath: /gt2r/heights/ph_id_count
coordinates: gt2r_heights_delta_time gt2r_heights_lat_ph gt2r_heights_lon_ph
gt2r_heights_lat_ph: Array of 64 bit Reals [gt2r_heights_delta_time = 0..1043505]
units: degrees_north
long_name: Latitude
standard_name: latitude
description: Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point.
source: ATL03g ATBD, Section 3.4
valid_min: -90.000000000000000
valid_max: 90.000000000000000
origname: lat_ph
fullnamepath: /gt2r/heights/lat_ph
coordinates: gt2r_heights_delta_time gt2r_heights_lon_ph
gt2r_heights_dist_ph_along: Array of 32 bit Reals [gt2r_heights_delta_time = 0..1043505]
units: meters
long_name: Distance from equator crossing.
description: Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack.
source: ATL03 ATBD, Section 3.1
origname: dist_ph_along
fullnamepath: /gt2r/heights/dist_ph_along
coordinates: gt2r_heights_delta_time gt2r_heights_lat_ph gt2r_heights_lon_ph
gt2r_heights_signal_conf_ph: Array of 16 bit Integers [gt2r_heights_delta_time = 0..1043505][ds_surf_type = 0..4]
units: 1
contentType: qualityInformation
long_name: Photon Signal Confidence
description: Confidence level associated with each photon event selected as signal. 0=noise. 1=added to allow for buffer but algorithm classifies as background; 2=low; 3=med; 4=high). This parameter is a 5xN array where N is the number of photons in the granule, and the 5 rows indicate signal finding for each surface type (in order: land, ocean, sea ice, land ice and inland water). Events not associated with a specific surface type have a confidence level of -1. Events evaluated as TEP returns have a confidence level of -2.
source: ATL03 ATBD, Section 5, Conf
flag_meanings: possible_tep not_considered noise buffer low medium high
flag_values: -2, -1, 0, 1, 2, 3, 4
valid_min: -2
valid_max: 4
origname: signal_conf_ph
fullnamepath: /gt2r/heights/signal_conf_ph
coordinates: gt2r_heights_delta_time gt2r_heights_lat_ph gt2r_heights_lon_ph
gt2r_heights_ph_id_pulse: Array of Bytes [gt2r_heights_delta_time = 0..1043505]
units: counts
contentType: referenceInformation
long_name: laser pulse counter
description: The laser pulse counter is part of photon ID and counts from 1 to 200 and is reset for each new major frame.
source: Derived as part of Photon ID
origname: ph_id_pulse
fullnamepath: /gt2r/heights/ph_id_pulse
coordinates: gt2r_heights_delta_time gt2r_heights_lat_ph gt2r_heights_lon_ph
gt2r_heights_h_ph: Array of 32 bit Reals [gt2r_heights_delta_time = 0..1043505]
units: meters
contentType: physicalMeasurement
long_name: Photon WGS84 Height
standard_name: height
description: Height of each received photon, relative to the WGS-84 ellipsoid including the geophysical corrections noted in Section 6. Please note that neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights.
source: ATL03g ATBD, Section 3.4
origname: h_ph
fullnamepath: /gt2r/heights/h_ph
coordinates: gt2r_heights_delta_time gt2r_heights_lat_ph gt2r_heights_lon_ph
gt2r_heights_ph_id_channel: Array of Bytes [gt2r_heights_delta_time = 0..1043505]
units: 1
contentType: referenceInformation
long_name: Receive channel id
description: Channel number assigned for each received photon event. This is part of the photon ID. Values range from 1 to 120 to span all channels and rise/fall edges. Values 1 to 60 are for falling edge; PCE1 (1 to 20), PCE 2 (21 to 40) and PCE3 (41 to 60). Values 61 to 120 are for rising edge; PCE1 (61 to 80), PCE 2 (81 to 100) and PC3 (101 to 120).
source: Derived as part of Photon ID
valid_min: 1
valid_max: 120
origname: ph_id_channel
fullnamepath: /gt2r/heights/ph_id_channel
coordinates: gt2r_heights_delta_time gt2r_heights_lat_ph gt2r_heights_lon_ph
gt2r_heights_lon_ph: Array of 64 bit Reals [gt2r_heights_delta_time = 0..1043505]
units: degrees_east
long_name: Longitude
standard_name: longitude
description: Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point.
source: ATL03g ATBD, Section 3.4
valid_min: -180.00000000000000
valid_max: 180.00000000000000
origname: lon_ph
fullnamepath: /gt2r/heights/lon_ph
coordinates: gt2r_heights_delta_time gt2r_heights_lat_ph
gt2r_heights_pce_mframe_cnt: Array of 32 bit Unsigned integers [gt2r_heights_delta_time = 0..1043505]
units: counts
contentType: referenceInformation
long_name: PCE Major frame counter
description: The major frame counter is read from the digital flow controller in a given PCE card. The counter identifies individual major frames across diag and science packets. Used as part of the photon ID.
source: Retained from prior a_alt_science_ph packet
origname: pce_mframe_cnt
fullnamepath: /gt2r/heights/pce_mframe_cnt
coordinates: gt2r_heights_delta_time gt2r_heights_lat_ph gt2r_heights_lon_ph
gt2r_heights_dist_ph_across: Array of 32 bit Reals [gt2r_heights_delta_time = 0..1043505]
units: meters
long_name: Distance off RGT.
description: Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1.
source: ATL03 ATBD, Section 3.1
origname: dist_ph_across
fullnamepath: /gt2r/heights/dist_ph_across
coordinates: gt2r_heights_delta_time gt2r_heights_lat_ph gt2r_heights_lon_ph
quality_assessment_qa_granule_pass_fail: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: qualityInformation
long_name: Granule Pass Flag
description: Flag indicating granule quality. 0=granule passes automatic QA. 1=granule fails automatic QA.
source: Operations
flag_meanings: PASS FAIL
flag_values: 0, 1
valid_min: 0
valid_max: 1
origname: qa_granule_pass_fail
fullnamepath: /quality_assessment/qa_granule_pass_fail
quality_assessment_gt1r_qa_perc_signal_conf_ph_high: Array of 64 bit Reals [quality_assessment_delta_time = 0..0][ds_surf_type = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_HIgh
description: The percentage of high-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_high
fullnamepath: /quality_assessment/gt1r/qa_perc_signal_conf_ph_high
coordinates: quality_assessment_delta_time
quality_assessment_gt1r_qa_perc_signal_conf_ph_low: Array of 64 bit Reals [quality_assessment_delta_time = 0..0][ds_surf_type = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_Low
description: The percentage of low-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_low
fullnamepath: /quality_assessment/gt1r/qa_perc_signal_conf_ph_low
coordinates: quality_assessment_delta_time
quality_assessment_gt1r_qa_perc_signal_conf_ph_med: Array of 64 bit Reals [quality_assessment_delta_time = 0..0][ds_surf_type = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_Med
description: The percentage of medium-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_med
fullnamepath: /quality_assessment/gt1r/qa_perc_signal_conf_ph_med
coordinates: quality_assessment_delta_time
quality_assessment_gt1r_qa_perc_surf_type: Array of 64 bit Reals [quality_assessment_delta_time = 0..0][ds_surf_type = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Surface_Type
description: The percentage of geolocation segments for each surface type, based on the total number of geolocation segments.
source: ATL03 ATBD, Section 8
origname: qa_perc_surf_type
fullnamepath: /quality_assessment/gt1r/qa_perc_surf_type
coordinates: quality_assessment_delta_time
quality_assessment_gt2r_qa_perc_signal_conf_ph_high: Array of 64 bit Reals [quality_assessment_delta_time = 0..0][ds_surf_type = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_HIgh
description: The percentage of high-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_high
fullnamepath: /quality_assessment/gt2r/qa_perc_signal_conf_ph_high
coordinates: quality_assessment_delta_time
quality_assessment_gt2r_qa_perc_signal_conf_ph_low: Array of 64 bit Reals [quality_assessment_delta_time = 0..0][ds_surf_type = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_Low
description: The percentage of low-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_low
fullnamepath: /quality_assessment/gt2r/qa_perc_signal_conf_ph_low
coordinates: quality_assessment_delta_time
quality_assessment_gt2r_qa_perc_signal_conf_ph_med: Array of 64 bit Reals [quality_assessment_delta_time = 0..0][ds_surf_type = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_Med
description: The percentage of medium-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_med
fullnamepath: /quality_assessment/gt2r/qa_perc_signal_conf_ph_med
coordinates: quality_assessment_delta_time
quality_assessment_gt2r_qa_perc_surf_type: Array of 64 bit Reals [quality_assessment_delta_time = 0..0][ds_surf_type = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Surface_Type
description: The percentage of geolocation segments for each surface type, based on the total number of geolocation segments.
source: ATL03 ATBD, Section 8
origname: qa_perc_surf_type
fullnamepath: /quality_assessment/gt2r/qa_perc_surf_type
coordinates: quality_assessment_delta_time
quality_assessment_gt1l_qa_perc_signal_conf_ph_high: Array of 64 bit Reals [FakeDim0 = 0..0][FakeDim1 = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_HIgh
description: The percentage of high-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_high
fullnamepath: /quality_assessment/gt1l/qa_perc_signal_conf_ph_high
coordinates: quality_assessment_delta_time
quality_assessment_gt1l_qa_perc_signal_conf_ph_low: Array of 64 bit Reals [FakeDim0 = 0..0][FakeDim1 = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_Low
description: The percentage of low-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_low
fullnamepath: /quality_assessment/gt1l/qa_perc_signal_conf_ph_low
coordinates: quality_assessment_delta_time
quality_assessment_gt1l_qa_perc_signal_conf_ph_med: Array of 64 bit Reals [FakeDim0 = 0..0][FakeDim1 = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_Med
description: The percentage of medium-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_med
fullnamepath: /quality_assessment/gt1l/qa_perc_signal_conf_ph_med
coordinates: quality_assessment_delta_time
quality_assessment_gt1l_qa_perc_surf_type: Array of 64 bit Reals [FakeDim0 = 0..0][FakeDim1 = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Surface_Type
description: The percentage of geolocation segments for each surface type, based on the total number of geolocation segments.
source: ATL03 ATBD, Section 8
origname: qa_perc_surf_type
fullnamepath: /quality_assessment/gt1l/qa_perc_surf_type
coordinates: quality_assessment_delta_time
quality_assessment_qa_granule_fail_reason: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: qualityInformation
long_name: Granule Failure Reason
description: Flag indicating granule failure reason. 0=no failure; 1=processing error; 2=Insufficient output data was generated; 3=TBD Failure; 4=TBD_Failure; 5=other failure.
source: Operations
flag_meanings: no_failure PROCESS_ERROR INSUFFICIENT_OUTPUT failure_3 failure_4 OTHER_FAILURE
flag_values: 0, 1, 2, 3, 4, 5
valid_min: 0
valid_max: 5
origname: qa_granule_fail_reason
fullnamepath: /quality_assessment/qa_granule_fail_reason
quality_assessment_gt3l_qa_perc_signal_conf_ph_high: Array of 64 bit Reals [FakeDim0 = 0..0][FakeDim1 = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_HIgh
description: The percentage of high-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_high
fullnamepath: /quality_assessment/gt3l/qa_perc_signal_conf_ph_high
coordinates: quality_assessment_delta_time
quality_assessment_gt3l_qa_perc_signal_conf_ph_low: Array of 64 bit Reals [FakeDim0 = 0..0][FakeDim1 = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_Low
description: The percentage of low-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_low
fullnamepath: /quality_assessment/gt3l/qa_perc_signal_conf_ph_low
coordinates: quality_assessment_delta_time
quality_assessment_gt3l_qa_perc_signal_conf_ph_med: Array of 64 bit Reals [FakeDim0 = 0..0][FakeDim1 = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_Med
description: The percentage of medium-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_med
fullnamepath: /quality_assessment/gt3l/qa_perc_signal_conf_ph_med
coordinates: quality_assessment_delta_time
quality_assessment_gt3l_qa_perc_surf_type: Array of 64 bit Reals [FakeDim0 = 0..0][FakeDim1 = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Surface_Type
description: The percentage of geolocation segments for each surface type, based on the total number of geolocation segments.
source: ATL03 ATBD, Section 8
origname: qa_perc_surf_type
fullnamepath: /quality_assessment/gt3l/qa_perc_surf_type
coordinates: quality_assessment_delta_time
quality_assessment_gt2l_qa_perc_signal_conf_ph_high: Array of 64 bit Reals [FakeDim0 = 0..0][FakeDim1 = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_HIgh
description: The percentage of high-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_high
fullnamepath: /quality_assessment/gt2l/qa_perc_signal_conf_ph_high
coordinates: quality_assessment_delta_time
quality_assessment_gt2l_qa_perc_signal_conf_ph_low: Array of 64 bit Reals [FakeDim0 = 0..0][FakeDim1 = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_Low
description: The percentage of low-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_low
fullnamepath: /quality_assessment/gt2l/qa_perc_signal_conf_ph_low
coordinates: quality_assessment_delta_time
quality_assessment_gt2l_qa_perc_signal_conf_ph_med: Array of 64 bit Reals [FakeDim0 = 0..0][FakeDim1 = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_Med
description: The percentage of medium-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_med
fullnamepath: /quality_assessment/gt2l/qa_perc_signal_conf_ph_med
coordinates: quality_assessment_delta_time
quality_assessment_gt2l_qa_perc_surf_type: Array of 64 bit Reals [FakeDim0 = 0..0][FakeDim1 = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Surface_Type
description: The percentage of geolocation segments for each surface type, based on the total number of geolocation segments.
source: ATL03 ATBD, Section 8
origname: qa_perc_surf_type
fullnamepath: /quality_assessment/gt2l/qa_perc_surf_type
coordinates: quality_assessment_delta_time
quality_assessment_gt3r_qa_perc_signal_conf_ph_high: Array of 64 bit Reals [quality_assessment_delta_time = 0..0][ds_surf_type = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_HIgh
description: The percentage of high-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_high
fullnamepath: /quality_assessment/gt3r/qa_perc_signal_conf_ph_high
coordinates: quality_assessment_delta_time
quality_assessment_gt3r_qa_perc_signal_conf_ph_low: Array of 64 bit Reals [quality_assessment_delta_time = 0..0][ds_surf_type = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_Low
description: The percentage of low-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_low
fullnamepath: /quality_assessment/gt3r/qa_perc_signal_conf_ph_low
coordinates: quality_assessment_delta_time
quality_assessment_gt3r_qa_perc_signal_conf_ph_med: Array of 64 bit Reals [quality_assessment_delta_time = 0..0][ds_surf_type = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Signal_Conf_Ph_Med
description: The percentage of medium-confidence signal photons for each surface type, based on the total number of photons for each surface type.
source: ATL03 ATBD, Section 8
origname: qa_perc_signal_conf_ph_med
fullnamepath: /quality_assessment/gt3r/qa_perc_signal_conf_ph_med
coordinates: quality_assessment_delta_time
quality_assessment_gt3r_qa_perc_surf_type: Array of 64 bit Reals [quality_assessment_delta_time = 0..0][ds_surf_type = 0..4]
units: percent
contentType: qualityInformation
long_name: Percent_Surface_Type
description: The percentage of geolocation segments for each surface type, based on the total number of geolocation segments.
source: ATL03 ATBD, Section 8
origname: qa_perc_surf_type
fullnamepath: /quality_assessment/gt3r/qa_perc_surf_type
coordinates: quality_assessment_delta_time
atlas_impulse_response_pce1_spot1_tep_histogram_reference_tep_flag: Array of 32 bit Integers [atlas_impulse_response_pce1_spot1_tep_histogram_tep_tod = 0..0]
units: 1
contentType: auxiliaryInformation
description: Flag that indicates the reference TEP has been used in place of a more recent TEP realization. 0=dynamic TEP used; 1=static reference TEP used.
source: ATL03 ATBD, Section 7.2
flag_meanings: dynamic_tep_used, reference_tep_used
flag_values: 0, 1
valid_min: 0
valid_max: 1
long_name: Reference TEP Used
origname: reference_tep_flag
fullnamepath: /atlas_impulse_response/pce1_spot1/tep_histogram/reference_tep_flag
atlas_impulse_response_pce1_spot1_tep_histogram_tep_bckgrd: Array of 32 bit Integers [atlas_impulse_response_pce1_spot1_tep_histogram_tep_tod = 0..0]
units: counts
long_name: TEP Background
description: The average number of counts in the TEP histogram bins, after excluding bins that likely contain the transmit pulse.
source: ATL02 ATBD, Section 7.2
origname: tep_bckgrd
fullnamepath: /atlas_impulse_response/pce1_spot1/tep_histogram/tep_bckgrd
coordinates: atlas_impulse_response_pce1_spot1_tep_histogram_tep_tod
atlas_impulse_response_pce1_spot1_tep_histogram_tep_duration: Array of 64 bit Reals [atlas_impulse_response_pce1_spot1_tep_histogram_tep_tod = 0..0]
units: seconds
long_name: TEP Duration
description: The duration (or width) of data in the TEP histogram. Will generally be greater than 10 seconds.
source: ATL02 ATBD, Section 7.2
origname: tep_duration
fullnamepath: /atlas_impulse_response/pce1_spot1/tep_histogram/tep_duration
coordinates: atlas_impulse_response_pce1_spot1_tep_histogram_tep_tod
atlas_impulse_response_pce1_spot1_tep_histogram_tep_hist: Array of 64 bit Reals [atlas_impulse_response_pce1_spot1_tep_histogram_tep_hist_time = 0..1999]
units: counts
long_name: TEP Histogram
description: The normalized number of counts in each bin of the TEP histogram.
source: ATL02 ATBD, Section 7.2
origname: tep_hist
fullnamepath: /atlas_impulse_response/pce1_spot1/tep_histogram/tep_hist
coordinates: atlas_impulse_response_pce1_spot1_tep_histogram_tep_hist_time
atlas_impulse_response_pce2_spot3_tep_histogram_reference_tep_flag: Array of 32 bit Integers [atlas_impulse_response_pce2_spot3_tep_histogram_tep_tod = 0..0]
units: 1
contentType: auxiliaryInformation
description: Flag that indicates the reference TEP has been used in place of a more recent TEP realization. 0=dynamic TEP used; 1=static reference TEP used.
source: ATL03 ATBD, Section 7.2
flag_meanings: dynamic_tep_used, reference_tep_used
flag_values: 0, 1
valid_min: 0
valid_max: 1
long_name: Reference TEP Used
origname: reference_tep_flag
fullnamepath: /atlas_impulse_response/pce2_spot3/tep_histogram/reference_tep_flag
atlas_impulse_response_pce2_spot3_tep_histogram_tep_bckgrd: Array of 32 bit Integers [atlas_impulse_response_pce2_spot3_tep_histogram_tep_tod = 0..0]
units: counts
long_name: TEP Background
description: The average number of counts in the TEP histogram bins, after excluding bins that likely contain the transmit pulse.
source: ATL02 ATBD, Section 7.2
origname: tep_bckgrd
fullnamepath: /atlas_impulse_response/pce2_spot3/tep_histogram/tep_bckgrd
coordinates: atlas_impulse_response_pce2_spot3_tep_histogram_tep_tod
atlas_impulse_response_pce2_spot3_tep_histogram_tep_duration: Array of 64 bit Reals [atlas_impulse_response_pce2_spot3_tep_histogram_tep_tod = 0..0]
units: seconds
long_name: TEP Duration
description: The duration (or width) of data in the TEP histogram. Will generally be greater than 10 seconds.
source: ATL02 ATBD, Section 7.2
origname: tep_duration
fullnamepath: /atlas_impulse_response/pce2_spot3/tep_histogram/tep_duration
coordinates: atlas_impulse_response_pce2_spot3_tep_histogram_tep_tod
atlas_impulse_response_pce2_spot3_tep_histogram_tep_hist: Array of 64 bit Reals [atlas_impulse_response_pce2_spot3_tep_histogram_tep_hist_time = 0..1999]
units: counts
long_name: TEP Histogram
description: The normalized number of counts in each bin of the TEP histogram.
source: ATL02 ATBD, Section 7.2
origname: tep_hist
fullnamepath: /atlas_impulse_response/pce2_spot3/tep_histogram/tep_hist
coordinates: atlas_impulse_response_pce2_spot3_tep_histogram_tep_hist_time
ancillary_data_release: Array of Strings [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Release Number
description: Release number of the granule. The release number is incremented when the software or ancillary data used to create the granule has been changed.
source: Operations
origname: release
fullnamepath: /ancillary_data/release
ancillary_data_end_geoseg: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Ending Geolocation Segment
description: The ending geolocation segment number associated with the data contained within this granule. ICESat granule geographic regions are further refined by geolocation segments. During the geolocation process, a geolocation segment is created approximately every 20m from the start of the orbit to the end. The geolocation segments help align the ATLAS strong a weak beams and provide a common segment length for the L2 and higher products. The geolocation segment indices differ slightly from orbit-to-orbit because of the irregular shape of the Earth. The geolocation segment indices on ATL01 and ATL02 are only approximate because beams have not been aligned at the time of their creation.
source: Derived
origname: end_geoseg
fullnamepath: /ancillary_data/end_geoseg
ancillary_data_version: Array of Strings [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Version
description: Version number of this granule within the release. It is a sequential number corresponding to the number of times the granule has been reprocessed for the current release.
source: Operations
origname: version
fullnamepath: /ancillary_data/version
ancillary_data_calibrations_dead_time_radiometric_signal_loss_cal34_product: Array of Strings [FakeDim2 = 0..5]
units: 1
contentType: auxiliaryInformation
long_name: CAL Product Name
description: Name of ATLAS CAL Products containing the calibration data
source: CAL34
origname: cal34_product
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/cal34_product
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt1l_dead_time: Array of 32 bit Reals [FakeDim2 = 0..5]
units: ns
contentType: auxiliaryInformation
long_name: Dead Time
description: Dead time value
source: CAL34
origname: dead_time
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt1l/dead_time
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt1l_strength: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159]
units: 1
contentType: auxiliaryInformation
long_name: Beam Strength
description: Spot strength in events/shot (strength, deadtime)
source: CAL34
origname: strength
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt1l/strength
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt1l_rad_corr: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159][FakeDim4 = 0..497]
units: 1
contentType: auxiliaryInformation
long_name: Radiometric Correction
description: Radiometric Correction (width, strength, deadtime)
source: CAL34
origname: rad_corr
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt1l/rad_corr
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt1l_width: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim4 = 0..497]
units: ns
contentType: auxiliaryInformation
long_name: Apparent Width
description: Apparent width (width, deadtime)
source: CAL34
origname: width
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt1l/width
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt2l_dead_time: Array of 32 bit Reals [FakeDim2 = 0..5]
units: ns
contentType: auxiliaryInformation
long_name: Dead Time
description: Dead time value
source: CAL34
origname: dead_time
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt2l/dead_time
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt2l_strength: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159]
units: 1
contentType: auxiliaryInformation
long_name: Beam Strength
description: Spot strength in events/shot (strength, deadtime)
source: CAL34
origname: strength
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt2l/strength
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt2l_rad_corr: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159][FakeDim4 = 0..497]
units: 1
contentType: auxiliaryInformation
long_name: Radiometric Correction
description: Radiometric Correction (width, strength, deadtime)
source: CAL34
origname: rad_corr
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt2l/rad_corr
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt2l_width: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim4 = 0..497]
units: ns
contentType: auxiliaryInformation
long_name: Apparent Width
description: Apparent width (width, deadtime)
source: CAL34
origname: width
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt2l/width
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt1r_dead_time: Array of 32 bit Reals [FakeDim2 = 0..5]
units: ns
contentType: auxiliaryInformation
long_name: Dead Time
description: Dead time value
source: CAL34
origname: dead_time
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt1r/dead_time
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt1r_strength: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159]
units: 1
contentType: auxiliaryInformation
long_name: Beam Strength
description: Spot strength in events/shot (strength, deadtime)
source: CAL34
origname: strength
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt1r/strength
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt1r_rad_corr: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159][FakeDim4 = 0..497]
units: 1
contentType: auxiliaryInformation
long_name: Radiometric Correction
description: Radiometric Correction (width, strength, deadtime)
source: CAL34
origname: rad_corr
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt1r/rad_corr
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt1r_width: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim4 = 0..497]
units: ns
contentType: auxiliaryInformation
long_name: Apparent Width
description: Apparent width (width, deadtime)
source: CAL34
origname: width
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt1r/width
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt2r_dead_time: Array of 32 bit Reals [FakeDim2 = 0..5]
units: ns
contentType: auxiliaryInformation
long_name: Dead Time
description: Dead time value
source: CAL34
origname: dead_time
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt2r/dead_time
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt2r_strength: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159]
units: 1
contentType: auxiliaryInformation
long_name: Beam Strength
description: Spot strength in events/shot (strength, deadtime)
source: CAL34
origname: strength
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt2r/strength
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt2r_rad_corr: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159][FakeDim4 = 0..497]
units: 1
contentType: auxiliaryInformation
long_name: Radiometric Correction
description: Radiometric Correction (width, strength, deadtime)
source: CAL34
origname: rad_corr
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt2r/rad_corr
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt2r_width: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim4 = 0..497]
units: ns
contentType: auxiliaryInformation
long_name: Apparent Width
description: Apparent width (width, deadtime)
source: CAL34
origname: width
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt2r/width
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt3l_dead_time: Array of 32 bit Reals [FakeDim2 = 0..5]
units: ns
contentType: auxiliaryInformation
long_name: Dead Time
description: Dead time value
source: CAL34
origname: dead_time
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt3l/dead_time
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt3l_strength: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159]
units: 1
contentType: auxiliaryInformation
long_name: Beam Strength
description: Spot strength in events/shot (strength, deadtime)
source: CAL34
origname: strength
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt3l/strength
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt3l_rad_corr: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159][FakeDim4 = 0..497]
units: 1
contentType: auxiliaryInformation
long_name: Radiometric Correction
description: Radiometric Correction (width, strength, deadtime)
source: CAL34
origname: rad_corr
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt3l/rad_corr
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt3l_width: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim4 = 0..497]
units: ns
contentType: auxiliaryInformation
long_name: Apparent Width
description: Apparent width (width, deadtime)
source: CAL34
origname: width
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt3l/width
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt3r_dead_time: Array of 32 bit Reals [FakeDim2 = 0..5]
units: ns
contentType: auxiliaryInformation
long_name: Dead Time
description: Dead time value
source: CAL34
origname: dead_time
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt3r/dead_time
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt3r_strength: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159]
units: 1
contentType: auxiliaryInformation
long_name: Beam Strength
description: Spot strength in events/shot (strength, deadtime)
source: CAL34
origname: strength
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt3r/strength
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt3r_rad_corr: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159][FakeDim4 = 0..497]
units: 1
contentType: auxiliaryInformation
long_name: Radiometric Correction
description: Radiometric Correction (width, strength, deadtime)
source: CAL34
origname: rad_corr
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt3r/rad_corr
ancillary_data_calibrations_dead_time_radiometric_signal_loss_gt3r_width: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim4 = 0..497]
units: ns
contentType: auxiliaryInformation
long_name: Apparent Width
description: Apparent width (width, deadtime)
source: CAL34
origname: width
fullnamepath: /ancillary_data/calibrations/dead_time_radiometric_signal_loss/gt3r/width
ancillary_data_calibrations_dead_time_gt1r_dead_time: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19]
units: seconds
contentType: auxiliaryInformation
long_name: DeadTime
description: Dead Time (channel)
source: CAL42
origname: dead_time
fullnamepath: /ancillary_data/calibrations/dead_time/gt1r/dead_time
ancillary_data_calibrations_dead_time_gt1r_sigma: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19]
units: seconds
contentType: auxiliaryInformation
long_name: Sigma
description: Sigma (channel)
source: CAL42
origname: sigma
fullnamepath: /ancillary_data/calibrations/dead_time/gt1r/sigma
ancillary_data_calibrations_dead_time_gt2r_dead_time: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19]
units: seconds
contentType: auxiliaryInformation
long_name: DeadTime
description: Dead Time (channel)
source: CAL42
origname: dead_time
fullnamepath: /ancillary_data/calibrations/dead_time/gt2r/dead_time
ancillary_data_calibrations_dead_time_gt2r_sigma: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19]
units: seconds
contentType: auxiliaryInformation
long_name: Sigma
description: Sigma (channel)
source: CAL42
origname: sigma
fullnamepath: /ancillary_data/calibrations/dead_time/gt2r/sigma
ancillary_data_calibrations_dead_time_gt1l_dead_time: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19]
units: seconds
contentType: auxiliaryInformation
long_name: DeadTime
description: Dead Time (channel)
source: CAL42
origname: dead_time
fullnamepath: /ancillary_data/calibrations/dead_time/gt1l/dead_time
ancillary_data_calibrations_dead_time_gt1l_sigma: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19]
units: seconds
contentType: auxiliaryInformation
long_name: Sigma
description: Sigma (channel)
source: CAL42
origname: sigma
fullnamepath: /ancillary_data/calibrations/dead_time/gt1l/sigma
ancillary_data_calibrations_dead_time_gt3l_dead_time: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19]
units: seconds
contentType: auxiliaryInformation
long_name: DeadTime
description: Dead Time (channel)
source: CAL42
origname: dead_time
fullnamepath: /ancillary_data/calibrations/dead_time/gt3l/dead_time
ancillary_data_calibrations_dead_time_gt3l_sigma: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19]
units: seconds
contentType: auxiliaryInformation
long_name: Sigma
description: Sigma (channel)
source: CAL42
origname: sigma
fullnamepath: /ancillary_data/calibrations/dead_time/gt3l/sigma
ancillary_data_calibrations_dead_time_temperature: Array of 32 bit Reals [FakeDim0 = 0..0]
units: degreesC
contentType: auxiliaryInformation
long_name: Temperature
description: Temperature for which calibrations are provided.
source: CAL42
origname: temperature
fullnamepath: /ancillary_data/calibrations/dead_time/temperature
ancillary_data_calibrations_dead_time_cal42_product: Array of Strings [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
description: Name of ATLAS CAL Product containing the calibration data
source: CAL42
long_name: CAL Product Name
origname: cal42_product
fullnamepath: /ancillary_data/calibrations/dead_time/cal42_product
ancillary_data_calibrations_dead_time_gt2l_dead_time: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19]
units: seconds
contentType: auxiliaryInformation
long_name: DeadTime
description: Dead Time (channel)
source: CAL42
origname: dead_time
fullnamepath: /ancillary_data/calibrations/dead_time/gt2l/dead_time
ancillary_data_calibrations_dead_time_gt2l_sigma: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19]
units: seconds
contentType: auxiliaryInformation
long_name: Sigma
description: Sigma (channel)
source: CAL42
origname: sigma
fullnamepath: /ancillary_data/calibrations/dead_time/gt2l/sigma
ancillary_data_calibrations_dead_time_gt3r_dead_time: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19]
units: seconds
contentType: auxiliaryInformation
long_name: DeadTime
description: Dead Time (channel)
source: CAL42
origname: dead_time
fullnamepath: /ancillary_data/calibrations/dead_time/gt3r/dead_time
ancillary_data_calibrations_dead_time_gt3r_sigma: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19]
units: seconds
contentType: auxiliaryInformation
long_name: Sigma
description: Sigma (channel)
source: CAL42
origname: sigma
fullnamepath: /ancillary_data/calibrations/dead_time/gt3r/sigma
ancillary_data_calibrations_dead_time_side: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Detector Bank Side
description: A or B side of the detector bank
source: CAL42
flag_meanings: A B
flag_values: 1, 2
valid_min: 1
valid_max: 2
origname: side
fullnamepath: /ancillary_data/calibrations/dead_time/side
ancillary_data_calibrations_first_photon_bias_cal19_product: Array of Strings [FakeDim2 = 0..5]
units: 1
contentType: auxiliaryInformation
long_name: CAL Product Name
description: Name of ATLAS CAL Products containing the calibration data
source: CAL19
origname: cal19_product
fullnamepath: /ancillary_data/calibrations/first_photon_bias/cal19_product
ancillary_data_calibrations_first_photon_bias_gt1l_dead_time: Array of 32 bit Reals [FakeDim2 = 0..5]
units: ns
contentType: auxiliaryInformation
long_name: Dead Time
description: Dead time value
source: CAL19
origname: dead_time
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt1l/dead_time
ancillary_data_calibrations_first_photon_bias_gt1l_strength: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159]
units: 1
contentType: auxiliaryInformation
long_name: Beam Strength
description: Spot strength in events/shot (strength, deadtime)
source: CAL19
origname: strength
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt1l/strength
ancillary_data_calibrations_first_photon_bias_gt1l_ffb_corr: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159][FakeDim4 = 0..497]
units: ps
contentType: auxiliaryInformation
long_name: FFB Correction
description: First Photon Bias Correction (width, strength, deadtime) in picoseconds.
source: CAL19
origname: ffb_corr
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt1l/ffb_corr
ancillary_data_calibrations_first_photon_bias_gt1l_width: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim4 = 0..497]
units: ns
contentType: auxiliaryInformation
long_name: Apparent Width
description: Apparent width (width, deadtime)
source: CAL19
origname: width
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt1l/width
ancillary_data_calibrations_first_photon_bias_gt1r_dead_time: Array of 32 bit Reals [FakeDim2 = 0..5]
units: ns
contentType: auxiliaryInformation
long_name: Dead Time
description: Dead time value
source: CAL19
origname: dead_time
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt1r/dead_time
ancillary_data_calibrations_first_photon_bias_gt1r_strength: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159]
units: 1
contentType: auxiliaryInformation
long_name: Beam Strength
description: Spot strength in events/shot (strength, deadtime)
source: CAL19
origname: strength
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt1r/strength
ancillary_data_calibrations_first_photon_bias_gt1r_ffb_corr: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159][FakeDim4 = 0..497]
units: ps
contentType: auxiliaryInformation
long_name: FFB Correction
description: First Photon Bias Correction (width, strength, deadtime) in picoseconds.
source: CAL19
origname: ffb_corr
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt1r/ffb_corr
ancillary_data_calibrations_first_photon_bias_gt1r_width: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim4 = 0..497]
units: ns
contentType: auxiliaryInformation
long_name: Apparent Width
description: Apparent width (width, deadtime)
source: CAL19
origname: width
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt1r/width
ancillary_data_calibrations_first_photon_bias_gt2l_dead_time: Array of 32 bit Reals [FakeDim2 = 0..5]
units: ns
contentType: auxiliaryInformation
long_name: Dead Time
description: Dead time value
source: CAL19
origname: dead_time
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt2l/dead_time
ancillary_data_calibrations_first_photon_bias_gt2l_strength: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159]
units: 1
contentType: auxiliaryInformation
long_name: Beam Strength
description: Spot strength in events/shot (strength, deadtime)
source: CAL19
origname: strength
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt2l/strength
ancillary_data_calibrations_first_photon_bias_gt2l_ffb_corr: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159][FakeDim4 = 0..497]
units: ps
contentType: auxiliaryInformation
long_name: FFB Correction
description: First Photon Bias Correction (width, strength, deadtime) in picoseconds.
source: CAL19
origname: ffb_corr
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt2l/ffb_corr
ancillary_data_calibrations_first_photon_bias_gt2l_width: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim4 = 0..497]
units: ns
contentType: auxiliaryInformation
long_name: Apparent Width
description: Apparent width (width, deadtime)
source: CAL19
origname: width
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt2l/width
ancillary_data_calibrations_first_photon_bias_gt2r_dead_time: Array of 32 bit Reals [FakeDim2 = 0..5]
units: ns
contentType: auxiliaryInformation
long_name: Dead Time
description: Dead time value
source: CAL19
origname: dead_time
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt2r/dead_time
ancillary_data_calibrations_first_photon_bias_gt2r_strength: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159]
units: 1
contentType: auxiliaryInformation
long_name: Beam Strength
description: Spot strength in events/shot (strength, deadtime)
source: CAL19
origname: strength
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt2r/strength
ancillary_data_calibrations_first_photon_bias_gt2r_ffb_corr: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159][FakeDim4 = 0..497]
units: ps
contentType: auxiliaryInformation
long_name: FFB Correction
description: First Photon Bias Correction (width, strength, deadtime) in picoseconds.
source: CAL19
origname: ffb_corr
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt2r/ffb_corr
ancillary_data_calibrations_first_photon_bias_gt2r_width: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim4 = 0..497]
units: ns
contentType: auxiliaryInformation
long_name: Apparent Width
description: Apparent width (width, deadtime)
source: CAL19
origname: width
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt2r/width
ancillary_data_calibrations_first_photon_bias_gt3l_dead_time: Array of 32 bit Reals [FakeDim2 = 0..5]
units: ns
contentType: auxiliaryInformation
long_name: Dead Time
description: Dead time value
source: CAL19
origname: dead_time
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt3l/dead_time
ancillary_data_calibrations_first_photon_bias_gt3l_strength: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159]
units: 1
contentType: auxiliaryInformation
long_name: Beam Strength
description: Spot strength in events/shot (strength, deadtime)
source: CAL19
origname: strength
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt3l/strength
ancillary_data_calibrations_first_photon_bias_gt3l_ffb_corr: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159][FakeDim4 = 0..497]
units: ps
contentType: auxiliaryInformation
long_name: FFB Correction
description: First Photon Bias Correction (width, strength, deadtime) in picoseconds.
source: CAL19
origname: ffb_corr
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt3l/ffb_corr
ancillary_data_calibrations_first_photon_bias_gt3l_width: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim4 = 0..497]
units: ns
contentType: auxiliaryInformation
long_name: Apparent Width
description: Apparent width (width, deadtime)
source: CAL19
origname: width
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt3l/width
ancillary_data_calibrations_first_photon_bias_gt3r_dead_time: Array of 32 bit Reals [FakeDim2 = 0..5]
units: ns
contentType: auxiliaryInformation
long_name: Dead Time
description: Dead time value
source: CAL19
origname: dead_time
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt3r/dead_time
ancillary_data_calibrations_first_photon_bias_gt3r_strength: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159]
units: 1
contentType: auxiliaryInformation
long_name: Beam Strength
description: Spot strength in events/shot (strength, deadtime)
source: CAL19
origname: strength
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt3r/strength
ancillary_data_calibrations_first_photon_bias_gt3r_ffb_corr: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim3 = 0..159][FakeDim4 = 0..497]
units: ps
contentType: auxiliaryInformation
long_name: FFB Correction
description: First Photon Bias Correction (width, strength, deadtime) in picoseconds.
source: CAL19
origname: ffb_corr
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt3r/ffb_corr
ancillary_data_calibrations_first_photon_bias_gt3r_width: Array of 64 bit Reals [FakeDim2 = 0..5][FakeDim4 = 0..497]
units: ns
contentType: auxiliaryInformation
long_name: Apparent Width
description: Apparent width (width, deadtime)
source: CAL19
origname: width
fullnamepath: /ancillary_data/calibrations/first_photon_bias/gt3r/width
ancillary_data_calibrations_low_link_impulse_response_laser: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Laser
description: Laser Number
source: CAL20
origname: laser
fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/laser
ancillary_data_calibrations_low_link_impulse_response_mode: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Laser Power Setting
description: Laser Power Setting
source: CAL20
origname: mode
fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/mode
ancillary_data_calibrations_low_link_impulse_response_gt1r_hist: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19][ancillary_data_calibrations_low_link_impulse_response_hist_x = 0..1999]
units: 1
contentType: auxiliaryInformation
long_name: Histogram
description: Per-Channel Histogram
source: CAL20
origname: hist
fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/gt1r/hist
ancillary_data_calibrations_low_link_impulse_response_gt2r_hist: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19][ancillary_data_calibrations_low_link_impulse_response_hist_x = 0..1999]
units: 1
contentType: auxiliaryInformation
long_name: Histogram
description: Per-Channel Histogram
source: CAL20
origname: hist
fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/gt2r/hist
ancillary_data_calibrations_low_link_impulse_response_gt1l_hist: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19][ancillary_data_calibrations_low_link_impulse_response_hist_x = 0..1999]
units: 1
contentType: auxiliaryInformation
long_name: Histogram
description: Per-Channel Histogram
source: CAL20
origname: hist
fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/gt1l/hist
ancillary_data_calibrations_low_link_impulse_response_return_source: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Return Source
description: Source of the events from which the data are derived.
source: CAL20
flag_meanings: none tep maat echo
flag_values: 0, 1, 2, 3
valid_min: 0
valid_max: 3
origname: return_source
fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/return_source
ancillary_data_calibrations_low_link_impulse_response_cal20_product: Array of Strings [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: CAL Product Name
description: Name of ATLAS CAL Product containing the calibration data
source: CAL20
origname: cal20_product
fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/cal20_product
ancillary_data_calibrations_low_link_impulse_response_num_bins: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Number of Bins
description: Number of bins in the histogram
source: CAL20
origname: num_bins
fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/num_bins
ancillary_data_calibrations_low_link_impulse_response_gt3l_hist: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19][ancillary_data_calibrations_low_link_impulse_response_hist_x = 0..1999]
units: 1
contentType: auxiliaryInformation
long_name: Histogram
description: Per-Channel Histogram
source: CAL20
origname: hist
fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/gt3l/hist
ancillary_data_calibrations_low_link_impulse_response_temperature: Array of 32 bit Reals [FakeDim0 = 0..0]
units: degreesC
contentType: auxiliaryInformation
description: Temperature for which calibrations are provided.
source: CAL20
long_name: Temperature
origname: temperature
fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/temperature
ancillary_data_calibrations_low_link_impulse_response_bin_width: Array of 32 bit Reals [FakeDim0 = 0..0]
units: seconds
contentType: auxiliaryInformation
long_name: Bin Width
description: Histogram bin width
source: CAL20
origname: bin_width
fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/bin_width
ancillary_data_calibrations_low_link_impulse_response_gt2l_hist: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19][ancillary_data_calibrations_low_link_impulse_response_hist_x = 0..1999]
units: 1
contentType: auxiliaryInformation
long_name: Histogram
description: Per-Channel Histogram
source: CAL20
origname: hist
fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/gt2l/hist
ancillary_data_calibrations_low_link_impulse_response_gt3r_hist: Array of 64 bit Reals [ancillary_data_calibrations_ds_channel = 0..19][ancillary_data_calibrations_low_link_impulse_response_hist_x = 0..1999]
units: 1
contentType: auxiliaryInformation
long_name: Histogram
description: Per-Channel Histogram
source: CAL20
origname: hist
fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/gt3r/hist
ancillary_data_calibrations_low_link_impulse_response_side: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: A_or_B
description: A or B Side Component
source: CAL20
flag_meanings: A B
flag_values: 1, 2
valid_min: 1
valid_max: 2
origname: side
fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/side
ancillary_data_end_region: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Ending Region
description: The ending product-specific region number associated with the data contained within this granule. ICESat-2 data products are separated by geographic regions. The data contained within a specific region are the same for ATL01 and ATL02. ATL03 regions differ slightly because of different geolocation segment locations caused by the irregular shape of the Earth. The region indices for other products are completely independent.
source: Derived
origname: end_region
fullnamepath: /ancillary_data/end_region
ancillary_data_atlas_sdp_gps_epoch: Array of 64 bit Reals [FakeDim0 = 0..0]
units: seconds since 1980-01-06T00:00:00.000000Z
contentType: auxiliaryInformation
long_name: ATLAS Epoch Offset
description: Number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS Standard Data Product (SDP) epoch (2018-01-01:T00.00.00.000000 UTC). Add this value to delta time parameters to compute full gps_seconds (relative to the GPS epoch) for each data point.
source: Operations
origname: atlas_sdp_gps_epoch
fullnamepath: /ancillary_data/atlas_sdp_gps_epoch
ancillary_data_podppd_pad: Array of 64 bit Reals [FakeDim0 = 0..0]
units: seconds
contentType: auxiliaryInformation
long_name: Padding for POD/PPD Interpolation
description: Seconds of padding data needed for POD/PPD interpolation.
source: Control
origname: podppd_pad
fullnamepath: /ancillary_data/podppd_pad
ancillary_data_end_rgt: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Ending Reference Groundtrack
description: The ending reference groundtrack (RGT) number associated with the data contained within this granule. There are 1387 reference groundtrack in the ICESat-2 repeat orbit. The reference groundtrack increments each time the spacecraft completes a full orbit of the Earth and resets to 1 each time the spacecraft completes a full cycle.
source: Derived
valid_min: 1
valid_max: 1387
origname: end_rgt
fullnamepath: /ancillary_data/end_rgt
ancillary_data_end_delta_time: Array of 64 bit Reals [FakeDim0 = 0..0]
units: seconds since 2018-01-01
contentType: auxiliaryInformation
long_name: ATLAS End Time (Actual)
standard_name: time
description: Number of GPS seconds since the ATLAS SDP epoch at the last data point in the file. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: Derived
origname: end_delta_time
fullnamepath: /ancillary_data/end_delta_time
ancillary_data_end_orbit: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Ending Orbit Number
description: The ending orbit number associated with the data contained within this granule. The orbit number increments each time the spacecraft completes a full orbit of the Earth.
source: Derived
origname: end_orbit
fullnamepath: /ancillary_data/end_orbit
ancillary_data_start_cycle: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Starting Cycle
description: The starting cycle number associated with the data contained within this granule. The cycle number is the counter of the number of 91-day repeat cycles completed by the mission.
source: Derived
valid_min: 0
valid_max: 99
origname: start_cycle
fullnamepath: /ancillary_data/start_cycle
ancillary_data_atlas_engineering_transmit_tx_pulse_distribution: Array of 32 bit Reals [ancillary_data_atlas_engineering_ds_gt = 0..5][ancillary_data_start_delta_time = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: transmit pulse energy distribution
description: The fraction of the transmit pulse energy in a given beam, based on pre-launch calibration. This is a six-valued array mapped onto gt1l, gt1r, gt2l, gt2r, gt3l, gt3r using the sc_orient parameter.
source: ATL03 ATBD, Section 7.2
origname: tx_pulse_distribution
fullnamepath: /ancillary_data/atlas_engineering/transmit/tx_pulse_distribution
ancillary_data_atlas_engineering_transmit_tx_pulse_energy: Array of 32 bit Reals [ancillary_data_atlas_engineering_ds_gt = 0..5][ancillary_data_atlas_engineering_ds_stat = 0..3]
units: joules
contentType: auxiliaryInformation
long_name: ATLAS Transmit Energy
description: The mean, standard deviation, minimum and maximum values of the transmit energy for each beam as reported by the start pulse detector, averaged over a given ATL03 granule. This is a 6x4 array mapped onto gt1l, gt1r, gt2l, gt2r, gt3l, gt3r using the sc_orient parameter.
source: ATL03 ATBD Section 7.2.1
origname: tx_pulse_energy
fullnamepath: /ancillary_data/atlas_engineering/transmit/tx_pulse_energy
ancillary_data_atlas_engineering_transmit_tx_pulse_skew_est: Array of 32 bit Reals [ancillary_data_start_delta_time = 0..0][ancillary_data_atlas_engineering_ds_stat = 0..3]
units: seconds
contentType: auxiliaryInformation
long_name: transmit pulse shape skew
description: The difference between the means of the lower and upper threshold crossing times; a positive value corresponds to a positive skew in the pulse, and conversely for a negative value.
source: ATL02, described in ATL03 ATBD Section 7.2.1
origname: tx_pulse_skew_est
fullnamepath: /ancillary_data/atlas_engineering/transmit/tx_pulse_skew_est
ancillary_data_atlas_engineering_transmit_tx_pulse_thresh_lower: Array of 32 bit Reals [ancillary_data_start_delta_time = 0..0][ancillary_data_atlas_engineering_ds_stat = 0..3]
units: volts
contentType: auxiliaryInformation
long_name: transmit pulse lower threshold
description: The lower threshold setting of the start pulse detector. The threshold crossing times are used to determine the start pulse time, and estimate the start pulse shape. If this setting changes during a given granule, this parameter becomes two-valued.
source: ATL03 ATBD, Section 7.2
origname: tx_pulse_thresh_lower
fullnamepath: /ancillary_data/atlas_engineering/transmit/tx_pulse_thresh_lower
ancillary_data_atlas_engineering_transmit_tx_pulse_thresh_upper: Array of 32 bit Reals [ancillary_data_start_delta_time = 0..0][ancillary_data_atlas_engineering_ds_stat = 0..3]
units: volts
contentType: auxiliaryInformation
long_name: transmit pulse upper threshold
description: The upper threshold setting of the start pulse detector. The threshold crossing times are used to determine the start pulse time, and estimate the start pulse shape. If this setting changes during a given granule, this parameter becomes two-valued.
source: ATL03 ATBD, Section 7.2
origname: tx_pulse_thresh_upper
fullnamepath: /ancillary_data/atlas_engineering/transmit/tx_pulse_thresh_upper
ancillary_data_atlas_engineering_transmit_tx_pulse_width_lower: Array of 32 bit Reals [ancillary_data_start_delta_time = 0..0][ancillary_data_atlas_engineering_ds_stat = 0..3]
units: seconds
contentType: auxiliaryInformation
long_name: lower threshold crossing time difference
description: The difference between the two crossing times of the transmit pulse
source: ATL02, described in ATL03 ATBD Section 7.2.1
origname: tx_pulse_width_lower
fullnamepath: /ancillary_data/atlas_engineering/transmit/tx_pulse_width_lower
ancillary_data_atlas_engineering_transmit_tx_pulse_width_upper: Array of 32 bit Reals [ancillary_data_start_delta_time = 0..0][ancillary_data_atlas_engineering_ds_stat = 0..3]
units: seconds
contentType: auxiliaryInformation
long_name: upper threshold crossing time difference
description: The difference between the two crossing times of the transmit pulse
source: ATL02, described in ATL03 ATBD Section 7.2.1
origname: tx_pulse_width_upper
fullnamepath: /ancillary_data/atlas_engineering/transmit/tx_pulse_width_upper
ancillary_data_atlas_engineering_spd_ab_flag: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
description: Indicates if the active Start Pulse Detector (SPD) is side a (1) or side b (2).
source: Derived, L1B ATBD
flag_meanings: a b
flag_values: 1, 2
valid_min: 1
valid_max: 2
long_name: SPD A or B
origname: spd_ab_flag
fullnamepath: /ancillary_data/atlas_engineering/spd_ab_flag
ancillary_data_atlas_engineering_receiver_rx_bckgrd_sensitivity: Array of 32 bit Reals [ancillary_data_atlas_engineering_ds_gt = 0..5][ancillary_data_atlas_engineering_ds_stat = 0..3]
units: events/joule
contentType: auxiliaryInformation
long_name: Receiver background sensivitiy
description: Per-beam receiver background sensitivity. This is a six-valued array mapped onto gt1l, gt1r, gt2l, gt2r, gt3l, gt3r using the sc_orient parameter.
source: ATL02 ATBD, Sections 5.3.2
origname: rx_bckgrd_sensitivity
fullnamepath: /ancillary_data/atlas_engineering/receiver/rx_bckgrd_sensitivity
ancillary_data_atlas_engineering_receiver_rx_return_sensitivity: Array of 32 bit Reals [ancillary_data_atlas_engineering_ds_gt = 0..5][ancillary_data_atlas_engineering_ds_stat = 0..3]
units: events/joule
contentType: auxiliaryInformation
long_name: Receiver return sensitivity
description: Per-beam receiver return sensitivity. This is a six-valued array mapped onto gt1l, gt1r, gt2l, gt2r, gt3l, gt3r using the sc_orient parameter.
source: ATL02 ATBD, Sections 5.3.2
origname: rx_return_sensitivity
fullnamepath: /ancillary_data/atlas_engineering/receiver/rx_return_sensitivity
ancillary_data_atlas_engineering_tams_ab_flag: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: TAMS Side A or B
description: Indicates if the active TAMS is side a (1) or side b (2).
source: Derived, L1B ATBD
flag_meanings: a b
flag_values: 1, 2
valid_min: 1
valid_max: 2
origname: tams_ab_flag
fullnamepath: /ancillary_data/atlas_engineering/tams_ab_flag
ancillary_data_atlas_engineering_det_ab_flag: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Detector Side, A or B
description: Indicates if the active detector (DET) is side A (1) or side B (2).
source: Derived, L1B ATBD
flag_meanings: a b
flag_values: 1, 2
valid_min: 1
valid_max: 2
origname: det_ab_flag
fullnamepath: /ancillary_data/atlas_engineering/det_ab_flag
ancillary_data_atlas_engineering_lrs_ab_flag: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: LRS Side A or B
description: Indicates if the active LRS is side A (1) or side B (2).
source: Derived, L1B ATBD
flag_meanings: a b
flag_values: 1, 2
valid_min: 1
valid_max: 2
origname: lrs_ab_flag
fullnamepath: /ancillary_data/atlas_engineering/lrs_ab_flag
ancillary_data_atlas_engineering_laser_12_flag: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Laser 1 or Laser 2
description: Indicates if the active Laser is laser 1 or laser 2.
source: Derived, L1B ATBD
flag_meanings: 1 2
flag_values: 1, 2
valid_min: 1
valid_max: 2
origname: laser_12_flag
fullnamepath: /ancillary_data/atlas_engineering/laser_12_flag
ancillary_data_atlas_engineering_pdu_ab_flag: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: PDU Side A or B
description: Indicates if the active PDU is side a (1) or side b (2).
source: Derived, L1B ATBD
flag_meanings: a b
flag_values: 1, 2
valid_min: 1
valid_max: 2
origname: pdu_ab_flag
fullnamepath: /ancillary_data/atlas_engineering/pdu_ab_flag
ancillary_data_atlas_engineering_ph_uncorrelated_error: Array of 32 bit Reals [ancillary_data_atlas_engineering_ds_gt = 0..5][ancillary_data_start_delta_time = 0..0]
units: meters
contentType: auxiliaryInformation
long_name: Uncorrelated Error
description: The estimate of uncorrelated height error. This is a six-valued array mapped onto gt1l, gt1r, gt2l, gt2r, gt3l, gt3r using the sc_orient parameter.
source: ATL03 ATBD, Section 7.7.2
origname: ph_uncorrelated_error
fullnamepath: /ancillary_data/atlas_engineering/ph_uncorrelated_error
ancillary_data_atlas_engineering_hvpc_ab_flag: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: HVPC Side, A or B
description: Indicates if the active High Voltage Power Converter (HVPC) is side A (1) or side B (2).
source: Derived, L1B ATBD
flag_meanings: a b
flag_values: 1, 2
valid_min: 1
valid_max: 2
origname: hvpc_ab_flag
fullnamepath: /ancillary_data/atlas_engineering/hvpc_ab_flag
ancillary_data_data_end_utc: Array of Strings [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: End UTC Time of Granule (CCSDS-A, Actual)
description: UTC (in CCSDS-A format) of the last data point within the granule.
source: Derived
origname: data_end_utc
fullnamepath: /ancillary_data/data_end_utc
ancillary_data_control: Array of Strings [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Control File
description: PGE-specific control file used to generate this granule. To re-use, replace breaks (BR) with linefeeds.
source: Operations
origname: control
fullnamepath: /ancillary_data/control
ancillary_data_start_gpssow: Array of 64 bit Reals [FakeDim0 = 0..0]
units: seconds
contentType: auxiliaryInformation
long_name: Start GPS SOW of Granule (Actual)
description: GPS seconds-of-week of the first data point in the granule.
source: Derived
origname: start_gpssow
fullnamepath: /ancillary_data/start_gpssow
ancillary_data_gt1r_signal_find_input_sig_find_t_inc: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Histogram time increment
description: Time increment the algorithm uses to step through the photon cloud in a granule. Histograms are formed at each sig_find_t_inc interval to identify signal photon events.
source: ATL03, Section 5, _time
origname: sig_find_t_inc
fullnamepath: /ancillary_data/gt1r/signal_find_input/sig_find_t_inc
ancillary_data_gt1r_signal_find_input_alpha_max: Array of 64 bit Reals [FakeDim1 = 0..4]
units: radians
contentType: auxiliaryInformation
description: Maximum slope allowed for slant histogram; if larger than this then don
source: ATL03, Section 5, _max
long_name: Maximum Slope
origname: alpha_max
fullnamepath: /ancillary_data/gt1r/signal_find_input/alpha_max
ancillary_data_gt1r_signal_find_input_delta_z_bg: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Histogram height bin size for noise calculation from photon cloud
description: Width of a height bin in each atmospheric histogram, Ha, if calculating Ha from the photon cloud. Surface-type dependent.
source: ATL03, Section 5, _zBG
origname: delta_z_bg
fullnamepath: /ancillary_data/gt1r/signal_find_input/delta_z_bg
ancillary_data_gt1r_signal_find_input_e_linfit_edit: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Multiplier of STD of linear fit
description: Multiplier of standard deviation of linear fit to signal photons used to edit out noise during running linear fit edit of outliers.
source: ATL03, Section 5, e_linfit_edit
origname: e_linfit_edit
fullnamepath: /ancillary_data/gt1r/signal_find_input/e_linfit_edit
ancillary_data_gt1r_signal_find_input_e_m: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Multiplier of STD of background
description: Multiplier of standard deviation of the number of background photon events per bin used in determining signal photon threshold. Surface-type dependent.
source: ATL03, Section 5, em
origname: e_m
fullnamepath: /ancillary_data/gt1r/signal_find_input/e_m
ancillary_data_gt1r_signal_find_input_snrlow: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Signal to noise ratio low
description: Signal to noise ratio below which all selected signal has low confidence.
source: ATL03, Section 5, snrlow
origname: snrlow
fullnamepath: /ancillary_data/gt1r/signal_find_input/snrlow
ancillary_data_gt1r_signal_find_input_nslw_v: Array of 64 bit Reals [FakeDim1 = 0..4]
units: meters
contentType: auxiliaryInformation
long_name: Half height for variable slope slant histogramming
description: Half the value of the height window used for slant histogramming relative to the surface used when varying the surface slope, alpha, to fill large gaps. Surface-type dependent.
source: ATL03, Section 5, nslw_v
origname: nslw_v
fullnamepath: /ancillary_data/gt1r/signal_find_input/nslw_v
ancillary_data_gt1r_signal_find_input_nphot_min: Array of 32 bit Integers [FakeDim1 = 0..4]
units: counts
contentType: auxiliaryInformation
long_name: Minimum number of photons to fill gap
description: The minimum number of photons over which to perform a linear fit to estimate the surface profile across a gap. Surface-type dependent.
source: ATL03, Section 5, Nphotmin
origname: nphot_min
fullnamepath: /ancillary_data/gt1r/signal_find_input/nphot_min
ancillary_data_gt1r_signal_find_input_delta_zmin: Array of 64 bit Reals [FakeDim1 = 0..4]
units: meters
contentType: auxiliaryInformation
description: Minimum height bin size for histogramming for first sweep. Surface-type dependent.
source: ATL03, Section 5, _zmin
long_name: Minimum height bin size
origname: delta_zmin
fullnamepath: /ancillary_data/gt1r/signal_find_input/delta_zmin
ancillary_data_gt1r_signal_find_input_delta_t_max: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Histogram Maximum time
description: Maximum time interval over which photons are selected to histogram. Surface-type dependent.
source: ATL03, Section 5, _tmax
origname: delta_t_max
fullnamepath: /ancillary_data/gt1r/signal_find_input/delta_t_max
ancillary_data_gt1r_signal_find_input_lslant_flag: Array of 32 bit Integers [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Flag to request slant histogramming for strong beams.
description: Binary (logical) flag, if true (=1) then perform slant histogramming for the strong beam. Surface-type dependent.
source: ATL03, Section 5, lslant
flag_meanings: false true
flag_values: 0, 1
valid_min: 0
valid_max: 1
origname: lslant_flag
fullnamepath: /ancillary_data/gt1r/signal_find_input/lslant_flag
ancillary_data_gt1r_signal_find_input_n_delta_z2: Array of 32 bit Integers [FakeDim1 = 0..4]
units: counts
contentType: auxiliaryInformation
long_name: number of increments in z2
description: The number of increments between delta_zmax1 and delta_zmax2. Surface-type dependent.
source: ATL03, Section 5, n_z2
origname: n_delta_z2
fullnamepath: /ancillary_data/gt1r/signal_find_input/n_delta_z2
ancillary_data_gt1r_signal_find_input_e_m_mult: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Multiplier of STD of e_m
description: Multiplier of e_m used to determine Thsig2, threshold for singular bins. Surface-type dependent.
source: ATL03, Section 5, em_mult
origname: e_m_mult
fullnamepath: /ancillary_data/gt1r/signal_find_input/e_m_mult
ancillary_data_gt1r_signal_find_input_delta_t_min: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Histogram Minimum time
description: Minimum time interval over which photons are selected to histogram. Surface-type dependent.
source: ATL03, Section 5, _tmin
origname: delta_t_min
fullnamepath: /ancillary_data/gt1r/signal_find_input/delta_t_min
ancillary_data_gt1r_signal_find_input_r2: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Minimum ratio2
description: Minimum ratio of (maximum number of photons in any one bin of contiguous signal bins)/(Maximum number of photons in largest bin) in order to accept a group of potential signal bins as signal. Surface-type dependent.
source: ATL03, Section 5, R2
origname: r2
fullnamepath: /ancillary_data/gt1r/signal_find_input/r2
ancillary_data_gt1r_signal_find_input_snrmed: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Signal to noise ratio medium
description: Signal to noise ratio above which all selected signal has high confidence. Selected signal with signal to noise ratio between snrlow and snrmed is marked as medium confidence.
source: ATL03, Section 5, snrmed
origname: snrmed
fullnamepath: /ancillary_data/gt1r/signal_find_input/snrmed
ancillary_data_gt1r_signal_find_input_n_delta_z1: Array of 32 bit Integers [FakeDim1 = 0..4]
units: counts
contentType: auxiliaryInformation
long_name: number of increments in z1
description: The number of increments between delta_zmin and delat_zmax1. Surface-type dependent.
source: ATL03, Section 5, n_z1
origname: n_delta_z1
fullnamepath: /ancillary_data/gt1r/signal_find_input/n_delta_z1
ancillary_data_gt1r_signal_find_input_min_fit_time_fact: Array of 32 bit Integers [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: minimum fit time factor
description: The factor to multiply DTIME by to obtain the minimum time over which to fit a line to a height profile to calculate the local slope using running linear fits, min_fit_time.
source: ATL03, Section 5, min_fit_time_fact
origname: min_fit_time_fact
fullnamepath: /ancillary_data/gt1r/signal_find_input/min_fit_time_fact
ancillary_data_gt1r_signal_find_input_pc_bckgrd_flag: Array of 32 bit Integers [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: calculated background rate flag
description: Binary (logical) flag, if true (=1) then always use the photon cloud to calculate the background photon rate, if false only use the photon cloud in the absence of the atmospheric histogram. Surface-type dependent.
source: ATL03, Section 5, Lpcbg
flag_meanings: false true
flag_values: 0, 1
valid_min: 0
valid_max: 1
origname: pc_bckgrd_flag
fullnamepath: /ancillary_data/gt1r/signal_find_input/pc_bckgrd_flag
ancillary_data_gt1r_signal_find_input_t_gap_big: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Gap size criteria
description: For time gaps less than this value, slant histogramming is performed relative to the linear slope calculated from the surrounding signal. For time gaps greater than or equal to this value the slope is varied when performing slant histogramming. Surface-type dependent.
source: ATL03, Section 5, tgapbig
origname: t_gap_big
fullnamepath: /ancillary_data/gt1r/signal_find_input/t_gap_big
ancillary_data_gt1r_signal_find_input_e_a: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Multiplier of Ha_sigma
description: Multiplier of Ha_sigma used to determine which bins in the atmospheric histogram may contain signal photon events. Surface-type dependent.
source: ATL03, Section 5, ea
origname: e_a
fullnamepath: /ancillary_data/gt1r/signal_find_input/e_a
ancillary_data_gt1r_signal_find_input_delta_zmax2: Array of 64 bit Reals [FakeDim1 = 0..4]
units: meters
contentType: auxiliaryInformation
long_name: Maximum height bin size 2
description: Maximum height bin size for histogramming for second sweep. Surface-type dependent.
source: ATL03, Section 5, _zmax2
origname: delta_zmax2
fullnamepath: /ancillary_data/gt1r/signal_find_input/delta_zmax2
ancillary_data_gt1r_signal_find_input_nslw: Array of 64 bit Reals [FakeDim1 = 0..4]
units: meters
contentType: auxiliaryInformation
long_name: half height for slant histogramming
description: Half of the value of the height window used for slant histogramming relative to the surface defined by the linear fit to the surrounding photons at slope, alpha. Surface-type dependent.
source: ATL03, Section 5, nslw
origname: nslw
fullnamepath: /ancillary_data/gt1r/signal_find_input/nslw
ancillary_data_gt1r_signal_find_input_e_linfit_slant: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Multiplier of sigma linfit
description: Multiplier of sigma_linfit, the standard deviation of the residuals between the actual photon events used to estimate the surface using a linear fit; all photons with height > e_linfit_slant
source: ATL03, Section 5, e_linfit_slant
origname: e_linfit_slant
fullnamepath: /ancillary_data/gt1r/signal_find_input/e_linfit_slant
ancillary_data_gt1r_signal_find_input_addpad_flag: Array of 32 bit Integers [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Additional photon flag
description: Binary (logical) that if true (=1) then identify additional photon events as padding to achieve htspanin for each time interval sig_find_t_inc.
source: ATL03, Section 5, Addpad
origname: addpad_flag
fullnamepath: /ancillary_data/gt1r/signal_find_input/addpad_flag
ancillary_data_gt1r_signal_find_input_nbin_min: Array of 32 bit Integers [FakeDim1 = 0..4]
units: counts
contentType: auxiliaryInformation
long_name: Minimum number of bins
description: Minimum number of bins in a histogram required for the algorithm to be able to process the histogram.
source: ATL03, Section 5, Nbinmin
origname: nbin_min
fullnamepath: /ancillary_data/gt1r/signal_find_input/nbin_min
ancillary_data_gt1r_signal_find_input_htspanmin: Array of 64 bit Reals [FakeDim1 = 0..4]
units: meters
contentType: auxiliaryInformation
long_name: Minimum height span
description: Minimum height span for each time interval of photons with confidence flag > 0. If the height span is < htspanmin then all photons not previously selected within +/- htspanmin/2 of the median height of the signal photons selected are marked with a confidence flag of 1. Surface-type dependent.
source: ATL03, Section 5, Htspanmin
origname: htspanmin
fullnamepath: /ancillary_data/gt1r/signal_find_input/htspanmin
ancillary_data_gt1r_signal_find_input_alpha_inc: Array of 64 bit Reals [FakeDim1 = 0..4]
units: radians
contentType: auxiliaryInformation
description: Increment by which the slope is varied for slant histogramming over large gaps
source: ATL03, Section 5, _inc
long_name: Slope Increment
origname: alpha_inc
fullnamepath: /ancillary_data/gt1r/signal_find_input/alpha_inc
ancillary_data_gt1r_signal_find_input_out_edit_flag: Array of 32 bit Integers [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: outlier edit flag
description: Binary (logical) flag, if true (=1) then perform an n _ edit on a running linear fit to identified signal to remove outliers. Surface-type dependent.
source: ATL03, Section 5, Ledit
flag_meanings: false true
flag_values: 0, 1
valid_min: 0
valid_max: 1
origname: out_edit_flag
fullnamepath: /ancillary_data/gt1r/signal_find_input/out_edit_flag
ancillary_data_gt1r_signal_find_input_delta_t_gap_min: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Mimimum delta time gap
description: Minimum size of a time gap in the height profile over which to use variable slope slant histogramming.
source: ATL03, Section 5, _time_gapmin
origname: delta_t_gap_min
fullnamepath: /ancillary_data/gt1r/signal_find_input/delta_t_gap_min
ancillary_data_gt1r_signal_find_input_delta_t_lin_fit: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Linear fit time increment
description: Time span over which to perform a running linear fit to identified signal photon events when editing outliers. Surface type dependent.
source: ATL03, Section 5, _t_linfit_edit
origname: delta_t_lin_fit
fullnamepath: /ancillary_data/gt1r/signal_find_input/delta_t_lin_fit
ancillary_data_gt1r_signal_find_input_r: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Minimum ratio
description: Minimum ratio of max number of photons in histogram bin to mean noise value that must exist to consider a bin a signal bin.
source: ATL03, Section 5, R
origname: r
fullnamepath: /ancillary_data/gt1r/signal_find_input/r
ancillary_data_gt2r_signal_find_input_sig_find_t_inc: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Histogram time increment
description: Time increment the algorithm uses to step through the photon cloud in a granule. Histograms are formed at each sig_find_t_inc interval to identify signal photon events.
source: ATL03, Section 5, _time
origname: sig_find_t_inc
fullnamepath: /ancillary_data/gt2r/signal_find_input/sig_find_t_inc
ancillary_data_gt2r_signal_find_input_alpha_max: Array of 64 bit Reals [FakeDim1 = 0..4]
units: radians
contentType: auxiliaryInformation
description: Maximum slope allowed for slant histogram; if larger than this then don
source: ATL03, Section 5, _max
long_name: Maximum Slope
origname: alpha_max
fullnamepath: /ancillary_data/gt2r/signal_find_input/alpha_max
ancillary_data_gt2r_signal_find_input_delta_z_bg: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Histogram height bin size for noise calculation from photon cloud
description: Width of a height bin in each atmospheric histogram, Ha, if calculating Ha from the photon cloud. Surface-type dependent.
source: ATL03, Section 5, _zBG
origname: delta_z_bg
fullnamepath: /ancillary_data/gt2r/signal_find_input/delta_z_bg
ancillary_data_gt2r_signal_find_input_e_linfit_edit: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Multiplier of STD of linear fit
description: Multiplier of standard deviation of linear fit to signal photons used to edit out noise during running linear fit edit of outliers.
source: ATL03, Section 5, e_linfit_edit
origname: e_linfit_edit
fullnamepath: /ancillary_data/gt2r/signal_find_input/e_linfit_edit
ancillary_data_gt2r_signal_find_input_e_m: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Multiplier of STD of background
description: Multiplier of standard deviation of the number of background photon events per bin used in determining signal photon threshold. Surface-type dependent.
source: ATL03, Section 5, em
origname: e_m
fullnamepath: /ancillary_data/gt2r/signal_find_input/e_m
ancillary_data_gt2r_signal_find_input_snrlow: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Signal to noise ratio low
description: Signal to noise ratio below which all selected signal has low confidence.
source: ATL03, Section 5, snrlow
origname: snrlow
fullnamepath: /ancillary_data/gt2r/signal_find_input/snrlow
ancillary_data_gt2r_signal_find_input_nslw_v: Array of 64 bit Reals [FakeDim1 = 0..4]
units: meters
contentType: auxiliaryInformation
long_name: Half height for variable slope slant histogramming
description: Half the value of the height window used for slant histogramming relative to the surface used when varying the surface slope, alpha, to fill large gaps. Surface-type dependent.
source: ATL03, Section 5, nslw_v
origname: nslw_v
fullnamepath: /ancillary_data/gt2r/signal_find_input/nslw_v
ancillary_data_gt2r_signal_find_input_nphot_min: Array of 32 bit Integers [FakeDim1 = 0..4]
units: counts
contentType: auxiliaryInformation
long_name: Minimum number of photons to fill gap
description: The minimum number of photons over which to perform a linear fit to estimate the surface profile across a gap. Surface-type dependent.
source: ATL03, Section 5, Nphotmin
origname: nphot_min
fullnamepath: /ancillary_data/gt2r/signal_find_input/nphot_min
ancillary_data_gt2r_signal_find_input_delta_zmin: Array of 64 bit Reals [FakeDim1 = 0..4]
units: meters
contentType: auxiliaryInformation
description: Minimum height bin size for histogramming for first sweep. Surface-type dependent.
source: ATL03, Section 5, _zmin
long_name: Minimum height bin size
origname: delta_zmin
fullnamepath: /ancillary_data/gt2r/signal_find_input/delta_zmin
ancillary_data_gt2r_signal_find_input_delta_t_max: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Histogram Maximum time
description: Maximum time interval over which photons are selected to histogram. Surface-type dependent.
source: ATL03, Section 5, _tmax
origname: delta_t_max
fullnamepath: /ancillary_data/gt2r/signal_find_input/delta_t_max
ancillary_data_gt2r_signal_find_input_lslant_flag: Array of 32 bit Integers [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Flag to request slant histogramming for strong beams.
description: Binary (logical) flag, if true (=1) then perform slant histogramming for the strong beam. Surface-type dependent.
source: ATL03, Section 5, lslant
flag_meanings: false true
flag_values: 0, 1
valid_min: 0
valid_max: 1
origname: lslant_flag
fullnamepath: /ancillary_data/gt2r/signal_find_input/lslant_flag
ancillary_data_gt2r_signal_find_input_n_delta_z2: Array of 32 bit Integers [FakeDim1 = 0..4]
units: counts
contentType: auxiliaryInformation
long_name: number of increments in z2
description: The number of increments between delta_zmax1 and delta_zmax2. Surface-type dependent.
source: ATL03, Section 5, n_z2
origname: n_delta_z2
fullnamepath: /ancillary_data/gt2r/signal_find_input/n_delta_z2
ancillary_data_gt2r_signal_find_input_e_m_mult: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Multiplier of STD of e_m
description: Multiplier of e_m used to determine Thsig2, threshold for singular bins. Surface-type dependent.
source: ATL03, Section 5, em_mult
origname: e_m_mult
fullnamepath: /ancillary_data/gt2r/signal_find_input/e_m_mult
ancillary_data_gt2r_signal_find_input_delta_t_min: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Histogram Minimum time
description: Minimum time interval over which photons are selected to histogram. Surface-type dependent.
source: ATL03, Section 5, _tmin
origname: delta_t_min
fullnamepath: /ancillary_data/gt2r/signal_find_input/delta_t_min
ancillary_data_gt2r_signal_find_input_r2: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Minimum ratio2
description: Minimum ratio of (maximum number of photons in any one bin of contiguous signal bins)/(Maximum number of photons in largest bin) in order to accept a group of potential signal bins as signal. Surface-type dependent.
source: ATL03, Section 5, R2
origname: r2
fullnamepath: /ancillary_data/gt2r/signal_find_input/r2
ancillary_data_gt2r_signal_find_input_snrmed: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Signal to noise ratio medium
description: Signal to noise ratio above which all selected signal has high confidence. Selected signal with signal to noise ratio between snrlow and snrmed is marked as medium confidence.
source: ATL03, Section 5, snrmed
origname: snrmed
fullnamepath: /ancillary_data/gt2r/signal_find_input/snrmed
ancillary_data_gt2r_signal_find_input_n_delta_z1: Array of 32 bit Integers [FakeDim1 = 0..4]
units: counts
contentType: auxiliaryInformation
long_name: number of increments in z1
description: The number of increments between delta_zmin and delat_zmax1. Surface-type dependent.
source: ATL03, Section 5, n_z1
origname: n_delta_z1
fullnamepath: /ancillary_data/gt2r/signal_find_input/n_delta_z1
ancillary_data_gt2r_signal_find_input_min_fit_time_fact: Array of 32 bit Integers [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: minimum fit time factor
description: The factor to multiply DTIME by to obtain the minimum time over which to fit a line to a height profile to calculate the local slope using running linear fits, min_fit_time.
source: ATL03, Section 5, min_fit_time_fact
origname: min_fit_time_fact
fullnamepath: /ancillary_data/gt2r/signal_find_input/min_fit_time_fact
ancillary_data_gt2r_signal_find_input_pc_bckgrd_flag: Array of 32 bit Integers [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: calculated background rate flag
description: Binary (logical) flag, if true (=1) then always use the photon cloud to calculate the background photon rate, if false only use the photon cloud in the absence of the atmospheric histogram. Surface-type dependent.
source: ATL03, Section 5, Lpcbg
flag_meanings: false true
flag_values: 0, 1
valid_min: 0
valid_max: 1
origname: pc_bckgrd_flag
fullnamepath: /ancillary_data/gt2r/signal_find_input/pc_bckgrd_flag
ancillary_data_gt2r_signal_find_input_t_gap_big: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Gap size criteria
description: For time gaps less than this value, slant histogramming is performed relative to the linear slope calculated from the surrounding signal. For time gaps greater than or equal to this value the slope is varied when performing slant histogramming. Surface-type dependent.
source: ATL03, Section 5, tgapbig
origname: t_gap_big
fullnamepath: /ancillary_data/gt2r/signal_find_input/t_gap_big
ancillary_data_gt2r_signal_find_input_e_a: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Multiplier of Ha_sigma
description: Multiplier of Ha_sigma used to determine which bins in the atmospheric histogram may contain signal photon events. Surface-type dependent.
source: ATL03, Section 5, ea
origname: e_a
fullnamepath: /ancillary_data/gt2r/signal_find_input/e_a
ancillary_data_gt2r_signal_find_input_delta_zmax2: Array of 64 bit Reals [FakeDim1 = 0..4]
units: meters
contentType: auxiliaryInformation
long_name: Maximum height bin size 2
description: Maximum height bin size for histogramming for second sweep. Surface-type dependent.
source: ATL03, Section 5, _zmax2
origname: delta_zmax2
fullnamepath: /ancillary_data/gt2r/signal_find_input/delta_zmax2
ancillary_data_gt2r_signal_find_input_nslw: Array of 64 bit Reals [FakeDim1 = 0..4]
units: meters
contentType: auxiliaryInformation
long_name: half height for slant histogramming
description: Half of the value of the height window used for slant histogramming relative to the surface defined by the linear fit to the surrounding photons at slope, alpha. Surface-type dependent.
source: ATL03, Section 5, nslw
origname: nslw
fullnamepath: /ancillary_data/gt2r/signal_find_input/nslw
ancillary_data_gt2r_signal_find_input_e_linfit_slant: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Multiplier of sigma linfit
description: Multiplier of sigma_linfit, the standard deviation of the residuals between the actual photon events used to estimate the surface using a linear fit; all photons with height > e_linfit_slant
source: ATL03, Section 5, e_linfit_slant
origname: e_linfit_slant
fullnamepath: /ancillary_data/gt2r/signal_find_input/e_linfit_slant
ancillary_data_gt2r_signal_find_input_addpad_flag: Array of 32 bit Integers [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Additional photon flag
description: Binary (logical) that if true (=1) then identify additional photon events as padding to achieve htspanin for each time interval sig_find_t_inc.
source: ATL03, Section 5, Addpad
origname: addpad_flag
fullnamepath: /ancillary_data/gt2r/signal_find_input/addpad_flag
ancillary_data_gt2r_signal_find_input_nbin_min: Array of 32 bit Integers [FakeDim1 = 0..4]
units: counts
contentType: auxiliaryInformation
long_name: Minimum number of bins
description: Minimum number of bins in a histogram required for the algorithm to be able to process the histogram.
source: ATL03, Section 5, Nbinmin
origname: nbin_min
fullnamepath: /ancillary_data/gt2r/signal_find_input/nbin_min
ancillary_data_gt2r_signal_find_input_htspanmin: Array of 64 bit Reals [FakeDim1 = 0..4]
units: meters
contentType: auxiliaryInformation
long_name: Minimum height span
description: Minimum height span for each time interval of photons with confidence flag > 0. If the height span is < htspanmin then all photons not previously selected within +/- htspanmin/2 of the median height of the signal photons selected are marked with a confidence flag of 1. Surface-type dependent.
source: ATL03, Section 5, Htspanmin
origname: htspanmin
fullnamepath: /ancillary_data/gt2r/signal_find_input/htspanmin
ancillary_data_gt2r_signal_find_input_alpha_inc: Array of 64 bit Reals [FakeDim1 = 0..4]
units: radians
contentType: auxiliaryInformation
description: Increment by which the slope is varied for slant histogramming over large gaps
source: ATL03, Section 5, _inc
long_name: Slope Increment
origname: alpha_inc
fullnamepath: /ancillary_data/gt2r/signal_find_input/alpha_inc
ancillary_data_gt2r_signal_find_input_out_edit_flag: Array of 32 bit Integers [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: outlier edit flag
description: Binary (logical) flag, if true (=1) then perform an n _ edit on a running linear fit to identified signal to remove outliers. Surface-type dependent.
source: ATL03, Section 5, Ledit
flag_meanings: false true
flag_values: 0, 1
valid_min: 0
valid_max: 1
origname: out_edit_flag
fullnamepath: /ancillary_data/gt2r/signal_find_input/out_edit_flag
ancillary_data_gt2r_signal_find_input_delta_t_gap_min: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Mimimum delta time gap
description: Minimum size of a time gap in the height profile over which to use variable slope slant histogramming.
source: ATL03, Section 5, _time_gapmin
origname: delta_t_gap_min
fullnamepath: /ancillary_data/gt2r/signal_find_input/delta_t_gap_min
ancillary_data_gt2r_signal_find_input_delta_t_lin_fit: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Linear fit time increment
description: Time span over which to perform a running linear fit to identified signal photon events when editing outliers. Surface type dependent.
source: ATL03, Section 5, _t_linfit_edit
origname: delta_t_lin_fit
fullnamepath: /ancillary_data/gt2r/signal_find_input/delta_t_lin_fit
ancillary_data_gt2r_signal_find_input_r: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Minimum ratio
description: Minimum ratio of max number of photons in histogram bin to mean noise value that must exist to consider a bin a signal bin.
source: ATL03, Section 5, R
origname: r
fullnamepath: /ancillary_data/gt2r/signal_find_input/r
ancillary_data_granule_end_utc: Array of Strings [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: End UTC Time of Granule (CCSDS-A, Requested)
description: Requested end time (in UTC CCSDS-A) of this granule.
source: Derived
origname: granule_end_utc
fullnamepath: /ancillary_data/granule_end_utc
ancillary_data_end_cycle: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Ending Cycle
description: The ending cycle number associated with the data contained within this granule. The cycle number is the counter of the number of 91-day repeat cycles completed by the mission.
source: Derived
valid_min: 0
valid_max: 99
origname: end_cycle
fullnamepath: /ancillary_data/end_cycle
ancillary_data_granule_start_utc: Array of Strings [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Start UTC Time of Granule (CCSDS-A, Requested)
description: Requested start time (in UTC CCSDS-A) of this granule.
source: Derived
origname: granule_start_utc
fullnamepath: /ancillary_data/granule_start_utc
ancillary_data_start_geoseg: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Starting Geolocation Segment
description: The starting geolocation segment number associated with the data contained within this granule. ICESat granule geographic regions are further refined by geolocation segments. During the geolocation process, a geolocation segment is created approximately every 20m from the start of the orbit to the end. The geolocation segments help align the ATLAS strong a weak beams and provide a common segment length for the L2 and higher products. The geolocation segment indices differ slightly from orbit-to-orbit because of the irregular shape of the Earth. The geolocation segment indices on ATL01 and ATL02 are only approximate because beams have not been aligned at the time of their creation.
source: Derived
origname: start_geoseg
fullnamepath: /ancillary_data/start_geoseg
ancillary_data_start_orbit: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Starting Orbit Number
description: The starting orbit number associated with the data contained within this granule. The orbit number increments each time the spacecraft completes a full orbit of the Earth.
source: Derived
origname: start_orbit
fullnamepath: /ancillary_data/start_orbit
ancillary_data_data_start_utc: Array of Strings [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Start UTC Time of Granule (CCSDS-A, Actual)
description: UTC (in CCSDS-A format) of the first data point within the granule.
source: Derived
origname: data_start_utc
fullnamepath: /ancillary_data/data_start_utc
ancillary_data_end_gpsweek: Array of 32 bit Integers [FakeDim0 = 0..0]
units: weeks from 1980-01-06
contentType: auxiliaryInformation
long_name: Ending GPSWeek of Granule (Actual)
description: GPS week number of the last data point in the granule.
source: Derived
origname: end_gpsweek
fullnamepath: /ancillary_data/end_gpsweek
ancillary_data_start_rgt: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Starting Reference Groundtrack
description: The starting reference groundtrack (RGT) number associated with the data contained within this granule. There are 1387 reference groundtrack in the ICESat-2 repeat orbit. The reference groundtrack increments each time the spacecraft completes a full orbit of the Earth and resets to 1 each time the spacecraft completes a full cycle.
source: Derived
valid_min: 1
valid_max: 1387
origname: start_rgt
fullnamepath: /ancillary_data/start_rgt
ancillary_data_end_gpssow: Array of 64 bit Reals [FakeDim0 = 0..0]
units: seconds
contentType: auxiliaryInformation
long_name: Ending GPS SOW of Granule (Actual)
description: GPS seconds-of-week of the last data point in the granule.
source: Derived
origname: end_gpssow
fullnamepath: /ancillary_data/end_gpssow
ancillary_data_tep_tep_normalize: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Normalization Enabled
description: Indicates if the TEP histogram was normalized. 0=not normalized; 1=normalized
source: Ops
flag_meanings: not_normalized normalized
flag_values: 0, 1
valid_min: 0
valid_max: 1
origname: tep_normalize
fullnamepath: /ancillary_data/tep/tep_normalize
ancillary_data_tep_tep_valid_spot: Array of 16 bit Integers [FakeDim2 = 0..5]
units: 1
contentType: referenceInformation
long_name: Index of TEP Spot
description: A 6x1 array indicating which TEP to use for each spot that does not have a TEP associated with it (e.g. which TEP to use to characterize spots 2, 4, 5, and 6).
source: ATL03 ATBD
flag_meanings: pce1_spot1 pce2_spot3
flag_values: 1, 2
valid_min: 1
valid_max: 2
origname: tep_valid_spot
fullnamepath: /ancillary_data/tep/tep_valid_spot
ancillary_data_tep_tep_range_prim: Array of 32 bit Reals [FakeDim5 = 0..1]
units: seconds
contentType: auxiliaryInformation
long_name: Range of Primary TEP Window
description: The range of time of flight of TEP photon events to include in generating a histogram or other analaysis of the primary TEP return
source: ATL03 ATBD
origname: tep_range_prim
fullnamepath: /ancillary_data/tep/tep_range_prim
ancillary_data_tep_tep_start_x: Array of 32 bit Reals [FakeDim0 = 0..0]
units: seconds
contentType: auxiliaryInformation
long_name: TEP Start X
description: Value at the left edge of the first histogram bin.
source: Derived
origname: tep_start_x
fullnamepath: /ancillary_data/tep/tep_start_x
ancillary_data_tep_min_tep_secs: Array of 64 bit Reals [FakeDim0 = 0..0]
units: seconds
contentType: auxiliaryInformation
long_name: Minimum TEP Seconds
description: Minimum seconds of data required for computing a TEP histogram.
source: Derived
origname: min_tep_secs
fullnamepath: /ancillary_data/tep/min_tep_secs
ancillary_data_tep_tep_sec_window: Array of 32 bit Reals [FakeDim5 = 0..1]
units: seconds
contentType: auxiliaryInformation
long_name: TEP Secondary Window
description: The range of the secondary TEP window. Bins within this range are used in computing TEP rate.
source: Derived
origname: tep_sec_window
fullnamepath: /ancillary_data/tep/tep_sec_window
ancillary_data_tep_tep_rm_noise: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Noise Removal Enabled
description: Indicates if noise was removed from the TEP histogram. 0=background noise not removed; 1=background noise removed
source: Ops
flag_meanings: noise_not_removed noise_removed
flag_values: 0, 1
valid_min: 0
valid_max: 1
origname: tep_rm_noise
fullnamepath: /ancillary_data/tep/tep_rm_noise
ancillary_data_tep_tep_bin_size: Array of 32 bit Reals [FakeDim0 = 0..0]
units: seconds
contentType: auxiliaryInformation
long_name: TEP Bin Size
description: Size of each TEP histogram bin.
source: Derived
origname: tep_bin_size
fullnamepath: /ancillary_data/tep/tep_bin_size
ancillary_data_tep_n_tep_bins: Array of 32 bit Integers [FakeDim0 = 0..0]
units: counts
contentType: auxiliaryInformation
long_name: Number of Bins
description: Number of bins in each TEP histogram
source: Derived
origname: n_tep_bins
fullnamepath: /ancillary_data/tep/n_tep_bins
ancillary_data_tep_min_tep_ph: Array of 32 bit Integers [FakeDim0 = 0..0]
units: seconds
contentType: auxiliaryInformation
long_name: Minimum TEP photons
description: Minimum number of TEP photons required for computing a TEP histogram.
source: Derived
origname: min_tep_ph
fullnamepath: /ancillary_data/tep/min_tep_ph
ancillary_data_tep_tep_peak_bins: Array of 32 bit Integers [FakeDim0 = 0..0]
units: counts
contentType: auxiliaryInformation
long_name: Number of Peak Bins to Remove
description: Number of peak bins to remove for TEP background computation.
source: Derived
origname: tep_peak_bins
fullnamepath: /ancillary_data/tep/tep_peak_bins
ancillary_data_tep_tep_gap_size: Array of 64 bit Reals [FakeDim0 = 0..0]
units: seconds
contentType: auxiliaryInformation
long_name: TEP Gap Size
description: Minimum number of seconds separating each TEP histogram instance.
source: Derived
origname: tep_gap_size
fullnamepath: /ancillary_data/tep/tep_gap_size
ancillary_data_tep_tep_prim_window: Array of 32 bit Reals [FakeDim5 = 0..1]
units: seconds
contentType: auxiliaryInformation
description: The range of the primary TEP window. Bins within this range are used in computing TEP rate.
source: Derived
long_name: TEP Primary Window
origname: tep_prim_window
fullnamepath: /ancillary_data/tep/tep_prim_window
ancillary_data_gt3r_signal_find_input_sig_find_t_inc: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Histogram time increment
description: Time increment the algorithm uses to step through the photon cloud in a granule. Histograms are formed at each sig_find_t_inc interval to identify signal photon events.
source: ATL03, Section 5, _time
origname: sig_find_t_inc
fullnamepath: /ancillary_data/gt3r/signal_find_input/sig_find_t_inc
ancillary_data_gt3r_signal_find_input_alpha_max: Array of 64 bit Reals [FakeDim1 = 0..4]
units: radians
contentType: auxiliaryInformation
description: Maximum slope allowed for slant histogram; if larger than this then don
source: ATL03, Section 5, _max
long_name: Maximum Slope
origname: alpha_max
fullnamepath: /ancillary_data/gt3r/signal_find_input/alpha_max
ancillary_data_gt3r_signal_find_input_delta_z_bg: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Histogram height bin size for noise calculation from photon cloud
description: Width of a height bin in each atmospheric histogram, Ha, if calculating Ha from the photon cloud. Surface-type dependent.
source: ATL03, Section 5, _zBG
origname: delta_z_bg
fullnamepath: /ancillary_data/gt3r/signal_find_input/delta_z_bg
ancillary_data_gt3r_signal_find_input_e_linfit_edit: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Multiplier of STD of linear fit
description: Multiplier of standard deviation of linear fit to signal photons used to edit out noise during running linear fit edit of outliers.
source: ATL03, Section 5, e_linfit_edit
origname: e_linfit_edit
fullnamepath: /ancillary_data/gt3r/signal_find_input/e_linfit_edit
ancillary_data_gt3r_signal_find_input_e_m: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Multiplier of STD of background
description: Multiplier of standard deviation of the number of background photon events per bin used in determining signal photon threshold. Surface-type dependent.
source: ATL03, Section 5, em
origname: e_m
fullnamepath: /ancillary_data/gt3r/signal_find_input/e_m
ancillary_data_gt3r_signal_find_input_snrlow: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Signal to noise ratio low
description: Signal to noise ratio below which all selected signal has low confidence.
source: ATL03, Section 5, snrlow
origname: snrlow
fullnamepath: /ancillary_data/gt3r/signal_find_input/snrlow
ancillary_data_gt3r_signal_find_input_nslw_v: Array of 64 bit Reals [FakeDim1 = 0..4]
units: meters
contentType: auxiliaryInformation
long_name: Half height for variable slope slant histogramming
description: Half the value of the height window used for slant histogramming relative to the surface used when varying the surface slope, alpha, to fill large gaps. Surface-type dependent.
source: ATL03, Section 5, nslw_v
origname: nslw_v
fullnamepath: /ancillary_data/gt3r/signal_find_input/nslw_v
ancillary_data_gt3r_signal_find_input_nphot_min: Array of 32 bit Integers [FakeDim1 = 0..4]
units: counts
contentType: auxiliaryInformation
long_name: Minimum number of photons to fill gap
description: The minimum number of photons over which to perform a linear fit to estimate the surface profile across a gap. Surface-type dependent.
source: ATL03, Section 5, Nphotmin
origname: nphot_min
fullnamepath: /ancillary_data/gt3r/signal_find_input/nphot_min
ancillary_data_gt3r_signal_find_input_delta_zmin: Array of 64 bit Reals [FakeDim1 = 0..4]
units: meters
contentType: auxiliaryInformation
description: Minimum height bin size for histogramming for first sweep. Surface-type dependent.
source: ATL03, Section 5, _zmin
long_name: Minimum height bin size
origname: delta_zmin
fullnamepath: /ancillary_data/gt3r/signal_find_input/delta_zmin
ancillary_data_gt3r_signal_find_input_delta_t_max: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Histogram Maximum time
description: Maximum time interval over which photons are selected to histogram. Surface-type dependent.
source: ATL03, Section 5, _tmax
origname: delta_t_max
fullnamepath: /ancillary_data/gt3r/signal_find_input/delta_t_max
ancillary_data_gt3r_signal_find_input_lslant_flag: Array of 32 bit Integers [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Flag to request slant histogramming for strong beams.
description: Binary (logical) flag, if true (=1) then perform slant histogramming for the strong beam. Surface-type dependent.
source: ATL03, Section 5, lslant
flag_meanings: false true
flag_values: 0, 1
valid_min: 0
valid_max: 1
origname: lslant_flag
fullnamepath: /ancillary_data/gt3r/signal_find_input/lslant_flag
ancillary_data_gt3r_signal_find_input_n_delta_z2: Array of 32 bit Integers [FakeDim1 = 0..4]
units: counts
contentType: auxiliaryInformation
long_name: number of increments in z2
description: The number of increments between delta_zmax1 and delta_zmax2. Surface-type dependent.
source: ATL03, Section 5, n_z2
origname: n_delta_z2
fullnamepath: /ancillary_data/gt3r/signal_find_input/n_delta_z2
ancillary_data_gt3r_signal_find_input_e_m_mult: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Multiplier of STD of e_m
description: Multiplier of e_m used to determine Thsig2, threshold for singular bins. Surface-type dependent.
source: ATL03, Section 5, em_mult
origname: e_m_mult
fullnamepath: /ancillary_data/gt3r/signal_find_input/e_m_mult
ancillary_data_gt3r_signal_find_input_delta_t_min: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Histogram Minimum time
description: Minimum time interval over which photons are selected to histogram. Surface-type dependent.
source: ATL03, Section 5, _tmin
origname: delta_t_min
fullnamepath: /ancillary_data/gt3r/signal_find_input/delta_t_min
ancillary_data_gt3r_signal_find_input_r2: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Minimum ratio2
description: Minimum ratio of (maximum number of photons in any one bin of contiguous signal bins)/(Maximum number of photons in largest bin) in order to accept a group of potential signal bins as signal. Surface-type dependent.
source: ATL03, Section 5, R2
origname: r2
fullnamepath: /ancillary_data/gt3r/signal_find_input/r2
ancillary_data_gt3r_signal_find_input_snrmed: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Signal to noise ratio medium
description: Signal to noise ratio above which all selected signal has high confidence. Selected signal with signal to noise ratio between snrlow and snrmed is marked as medium confidence.
source: ATL03, Section 5, snrmed
origname: snrmed
fullnamepath: /ancillary_data/gt3r/signal_find_input/snrmed
ancillary_data_gt3r_signal_find_input_n_delta_z1: Array of 32 bit Integers [FakeDim1 = 0..4]
units: counts
contentType: auxiliaryInformation
long_name: number of increments in z1
description: The number of increments between delta_zmin and delat_zmax1. Surface-type dependent.
source: ATL03, Section 5, n_z1
origname: n_delta_z1
fullnamepath: /ancillary_data/gt3r/signal_find_input/n_delta_z1
ancillary_data_gt3r_signal_find_input_min_fit_time_fact: Array of 32 bit Integers [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: minimum fit time factor
description: The factor to multiply DTIME by to obtain the minimum time over which to fit a line to a height profile to calculate the local slope using running linear fits, min_fit_time.
source: ATL03, Section 5, min_fit_time_fact
origname: min_fit_time_fact
fullnamepath: /ancillary_data/gt3r/signal_find_input/min_fit_time_fact
ancillary_data_gt3r_signal_find_input_pc_bckgrd_flag: Array of 32 bit Integers [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: calculated background rate flag
description: Binary (logical) flag, if true (=1) then always use the photon cloud to calculate the background photon rate, if false only use the photon cloud in the absence of the atmospheric histogram. Surface-type dependent.
source: ATL03, Section 5, Lpcbg
flag_meanings: false true
flag_values: 0, 1
valid_min: 0
valid_max: 1
origname: pc_bckgrd_flag
fullnamepath: /ancillary_data/gt3r/signal_find_input/pc_bckgrd_flag
ancillary_data_gt3r_signal_find_input_t_gap_big: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Gap size criteria
description: For time gaps less than this value, slant histogramming is performed relative to the linear slope calculated from the surrounding signal. For time gaps greater than or equal to this value the slope is varied when performing slant histogramming. Surface-type dependent.
source: ATL03, Section 5, tgapbig
origname: t_gap_big
fullnamepath: /ancillary_data/gt3r/signal_find_input/t_gap_big
ancillary_data_gt3r_signal_find_input_e_a: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Multiplier of Ha_sigma
description: Multiplier of Ha_sigma used to determine which bins in the atmospheric histogram may contain signal photon events. Surface-type dependent.
source: ATL03, Section 5, ea
origname: e_a
fullnamepath: /ancillary_data/gt3r/signal_find_input/e_a
ancillary_data_gt3r_signal_find_input_delta_zmax2: Array of 64 bit Reals [FakeDim1 = 0..4]
units: meters
contentType: auxiliaryInformation
long_name: Maximum height bin size 2
description: Maximum height bin size for histogramming for second sweep. Surface-type dependent.
source: ATL03, Section 5, _zmax2
origname: delta_zmax2
fullnamepath: /ancillary_data/gt3r/signal_find_input/delta_zmax2
ancillary_data_gt3r_signal_find_input_nslw: Array of 64 bit Reals [FakeDim1 = 0..4]
units: meters
contentType: auxiliaryInformation
long_name: half height for slant histogramming
description: Half of the value of the height window used for slant histogramming relative to the surface defined by the linear fit to the surrounding photons at slope, alpha. Surface-type dependent.
source: ATL03, Section 5, nslw
origname: nslw
fullnamepath: /ancillary_data/gt3r/signal_find_input/nslw
ancillary_data_gt3r_signal_find_input_e_linfit_slant: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Multiplier of sigma linfit
description: Multiplier of sigma_linfit, the standard deviation of the residuals between the actual photon events used to estimate the surface using a linear fit; all photons with height > e_linfit_slant
source: ATL03, Section 5, e_linfit_slant
origname: e_linfit_slant
fullnamepath: /ancillary_data/gt3r/signal_find_input/e_linfit_slant
ancillary_data_gt3r_signal_find_input_addpad_flag: Array of 32 bit Integers [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Additional photon flag
description: Binary (logical) that if true (=1) then identify additional photon events as padding to achieve htspanin for each time interval sig_find_t_inc.
source: ATL03, Section 5, Addpad
origname: addpad_flag
fullnamepath: /ancillary_data/gt3r/signal_find_input/addpad_flag
ancillary_data_gt3r_signal_find_input_nbin_min: Array of 32 bit Integers [FakeDim1 = 0..4]
units: counts
contentType: auxiliaryInformation
long_name: Minimum number of bins
description: Minimum number of bins in a histogram required for the algorithm to be able to process the histogram.
source: ATL03, Section 5, Nbinmin
origname: nbin_min
fullnamepath: /ancillary_data/gt3r/signal_find_input/nbin_min
ancillary_data_gt3r_signal_find_input_htspanmin: Array of 64 bit Reals [FakeDim1 = 0..4]
units: meters
contentType: auxiliaryInformation
long_name: Minimum height span
description: Minimum height span for each time interval of photons with confidence flag > 0. If the height span is < htspanmin then all photons not previously selected within +/- htspanmin/2 of the median height of the signal photons selected are marked with a confidence flag of 1. Surface-type dependent.
source: ATL03, Section 5, Htspanmin
origname: htspanmin
fullnamepath: /ancillary_data/gt3r/signal_find_input/htspanmin
ancillary_data_gt3r_signal_find_input_alpha_inc: Array of 64 bit Reals [FakeDim1 = 0..4]
units: radians
contentType: auxiliaryInformation
description: Increment by which the slope is varied for slant histogramming over large gaps
source: ATL03, Section 5, _inc
long_name: Slope Increment
origname: alpha_inc
fullnamepath: /ancillary_data/gt3r/signal_find_input/alpha_inc
ancillary_data_gt3r_signal_find_input_out_edit_flag: Array of 32 bit Integers [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: outlier edit flag
description: Binary (logical) flag, if true (=1) then perform an n _ edit on a running linear fit to identified signal to remove outliers. Surface-type dependent.
source: ATL03, Section 5, Ledit
flag_meanings: false true
flag_values: 0, 1
valid_min: 0
valid_max: 1
origname: out_edit_flag
fullnamepath: /ancillary_data/gt3r/signal_find_input/out_edit_flag
ancillary_data_gt3r_signal_find_input_delta_t_gap_min: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Mimimum delta time gap
description: Minimum size of a time gap in the height profile over which to use variable slope slant histogramming.
source: ATL03, Section 5, _time_gapmin
origname: delta_t_gap_min
fullnamepath: /ancillary_data/gt3r/signal_find_input/delta_t_gap_min
ancillary_data_gt3r_signal_find_input_delta_t_lin_fit: Array of 64 bit Reals [FakeDim1 = 0..4]
units: seconds
contentType: auxiliaryInformation
long_name: Linear fit time increment
description: Time span over which to perform a running linear fit to identified signal photon events when editing outliers. Surface type dependent.
source: ATL03, Section 5, _t_linfit_edit
origname: delta_t_lin_fit
fullnamepath: /ancillary_data/gt3r/signal_find_input/delta_t_lin_fit
ancillary_data_gt3r_signal_find_input_r: Array of 64 bit Reals [FakeDim1 = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Minimum ratio
description: Minimum ratio of max number of photons in histogram bin to mean noise value that must exist to consider a bin a signal bin.
source: ATL03, Section 5, R
origname: r
fullnamepath: /ancillary_data/gt3r/signal_find_input/r
ancillary_data_start_region: Array of 32 bit Integers [FakeDim0 = 0..0]
units: 1
contentType: auxiliaryInformation
long_name: Starting Region
description: The starting product-specific region number associated with the data contained within this granule. ICESat-2 data products are separated by geographic regions. The data contained within a specific region are the same for ATL01 and ATL02. ATL03 regions differ slightly because of different geolocation segment locations caused by the irregular shape of the Earth. The region indices for other products are completely independent.
source: Derived
origname: start_region
fullnamepath: /ancillary_data/start_region
ancillary_data_atl03_pad: Array of 64 bit Reals [FakeDim0 = 0..0]
units: seconds
contentType: auxiliaryInformation
long_name: Padding for ATL03 processing
description: Seconds of padding data needed for ATL03 processing.
source: Control
origname: atl03_pad
fullnamepath: /ancillary_data/atl03_pad
ancillary_data_start_gpsweek: Array of 32 bit Integers [FakeDim0 = 0..0]
units: weeks from 1980-01-06
contentType: auxiliaryInformation
long_name: Start GPSWeek of Granule (Actual)
description: GPS week number of the first data point in the granule.
source: Derived
origname: start_gpsweek
fullnamepath: /ancillary_data/start_gpsweek
gt3r_bckgrd_atlas_bckgrd_int_height: Array of 32 bit Reals [gt3r_bckgrd_atlas_delta_time = 0..84205]
units: meters
contentType: modelResult
long_name: Altimetric range window width
description: The height of the altimetric range window. This is the height over which the 50-shot sum is generated. Parameter is ingested at 50-Hz, and values are repeated to form a 200-Hz array.
source: ATL03 ATBD Section 7.3
origname: bckgrd_int_height
fullnamepath: /gt3r/bckgrd_atlas/bckgrd_int_height
coordinates: gt3r_bckgrd_atlas_delta_time
gt3r_bckgrd_atlas_tlm_height_band1: Array of 32 bit Reals [gt3r_bckgrd_atlas_delta_time = 0..84205]
units: meters
description: The height in meters of the telemetry band 1.
source: ATL03 ATBD, Section 7.3.2
long_name: Height of the telemetry band 1
origname: tlm_height_band1
fullnamepath: /gt3r/bckgrd_atlas/tlm_height_band1
coordinates: gt3r_bckgrd_atlas_delta_time
gt3r_bckgrd_atlas_bckgrd_rate: Array of 32 bit Reals [gt3r_bckgrd_atlas_delta_time = 0..84205]
units: counts / second
contentType: modelResult
long_name: Background count rate based on the ATLAS 50-shot sum
description: The background count rate from the 50-shot altimetric histogram after removing the number of likely signal photons based on Section 5.
source: ATL03 ATBD Section 7.3
origname: bckgrd_rate
fullnamepath: /gt3r/bckgrd_atlas/bckgrd_rate
coordinates: gt3r_bckgrd_atlas_delta_time
gt3r_bckgrd_atlas_tlm_top_band1: Array of 32 bit Reals [gt3r_bckgrd_atlas_delta_time = 0..84205]
units: meters
long_name: Ellipsoidal height of the top of the telemetry band 1.
description: The ellipsoidal heights with respect to WGS-84 of the top of the telemetry band 1, with all geophysical corrections applied.
source: ATL03 ATBD, Section 3.2, 7.3.2
origname: tlm_top_band1
fullnamepath: /gt3r/bckgrd_atlas/tlm_top_band1
coordinates: gt3r_bckgrd_atlas_delta_time
gt3r_bckgrd_atlas_tlm_top_band2: Array of 32 bit Reals [gt3r_bckgrd_atlas_delta_time = 0..84205]
units: meters
long_name: Ellipsoidal height of the top of the telemetry band 2.
description: The ellipsoidal heights with respect to WGS-84 of the top of the telemetry band 2, with all geophysical corrections applied.
source: ATL03 ATBD, Section 3.2, 7.3.2
origname: tlm_top_band2
fullnamepath: /gt3r/bckgrd_atlas/tlm_top_band2
coordinates: gt3r_bckgrd_atlas_delta_time
gt3r_bckgrd_atlas_bckgrd_int_height_reduced: Array of 32 bit Reals [gt3r_bckgrd_atlas_delta_time = 0..84205]
units: meters
contentType: modelResult
long_name: Altimetric range window height - reduced
description: The height of the altimetric range window after subtracting the height span of the signal photon events in the 50-shot span.
source: ATL03 ATBD Section 7.3
origname: bckgrd_int_height_reduced
fullnamepath: /gt3r/bckgrd_atlas/bckgrd_int_height_reduced
coordinates: gt3r_bckgrd_atlas_delta_time
gt3r_bckgrd_atlas_bckgrd_hist_top: Array of 32 bit Reals [gt3r_bckgrd_atlas_delta_time = 0..84205]
units: meters
contentType: modelResult
long_name: Top of the altimetric range window
description: The height of the top of the altimetric histogram, in meters above the WGS-84 ellipsoid, with all geophysical corrections applied. Parameter is ingested at 50-Hz, and values are repeated to form a 200-Hz array.
source: ATL03 ATBD Section 7.3
origname: bckgrd_hist_top
fullnamepath: /gt3r/bckgrd_atlas/bckgrd_hist_top
coordinates: gt3r_bckgrd_atlas_delta_time
gt3r_bckgrd_atlas_bckgrd_counts_reduced: Array of 32 bit Integers [gt3r_bckgrd_atlas_delta_time = 0..84205]
units: counts
contentType: modelResult
long_name: ATLAS 50-shot background count - reduced
description: Number of photon counts in the 50-shot sum after subtracting the number of signal photon events, defined as in ATBD Section 5, in that span.
source: ATL03 ATBD Section 7.3
origname: bckgrd_counts_reduced
fullnamepath: /gt3r/bckgrd_atlas/bckgrd_counts_reduced
coordinates: gt3r_bckgrd_atlas_delta_time
gt3r_bckgrd_atlas_tlm_height_band2: Array of 32 bit Reals [gt3r_bckgrd_atlas_delta_time = 0..84205]
units: meters
long_name: Height of the telemetry band 2
description: The height in meters of the telemetry band 2. (if 0, second band is not present).
source: ATL03 ATBD, Section 7.3.2
origname: tlm_height_band2
fullnamepath: /gt3r/bckgrd_atlas/tlm_height_band2
coordinates: gt3r_bckgrd_atlas_delta_time
gt3r_bckgrd_atlas_bckgrd_counts: Array of 32 bit Integers [gt3r_bckgrd_atlas_delta_time = 0..84205]
units: counts
contentType: modelResult
long_name: ATLAS 50-shot background count
description: Onboard 50 shot background (200 Hz) sum of photon events within the altimetric range window.
source: ATL03 ATBD Section 7.3
origname: bckgrd_counts
fullnamepath: /gt3r/bckgrd_atlas/bckgrd_counts
coordinates: gt3r_bckgrd_atlas_delta_time
gt3r_geolocation_segment_ph_cnt: Array of 32 bit Integers [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 0
units: counts
long_name: Number of photons
description: Number of photons in a given along-track segment. In the case of no photons within the segment (segment_ph_cnt=0), most other parameters are filled with invalid or best-estimate values. Maintaining geolocation segments with no photons allows for the geolocation segment arrays to be directly aligned across the gtx groups.
source: Derived
origname: segment_ph_cnt
fullnamepath: /gt3r/geolocation/segment_ph_cnt
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_segment_length: Array of 64 bit Reals [gt3r_geolocation_delta_time = 0..149895]
units: meters
long_name: along-track segment length
description: The along-track length of the along-track segment. Nominally these are 20m, but they vary from 19.8m to 20.2m.
source: ATL03 ATBD, Section 3.1
origname: segment_length
fullnamepath: /gt3r/geolocation/segment_length
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_range_bias_corr: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
long_name: range bias correction
description: The range_bias estimated from geolocation analysis.
source: ATL03G ATBD, Section 3.6
_FillValue: 3.402823466e+38
units: meters
origname: range_bias_corr
fullnamepath: /gt3r/geolocation/range_bias_corr
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_neutat_delay_derivative: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters/meters
long_name: (Neutral Atmosphere delay)/dh
description: Change in neutral atmospheric delay per height change
source: ATL03a ATBD
origname: neutat_delay_derivative
fullnamepath: /gt3r/geolocation/neutat_delay_derivative
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_reference_photon_lon: Array of 64 bit Reals [gt3r_geolocation_delta_time = 0..149895]
units: degrees_east
long_name: Segment Longitude
standard_name: longitude
description: Longitude of each reference photon. Computed from the ECF Cartesian coordinates of the bounce point. In the case of no photons within the segment (segment_ph_cnt=0), the coordinates are the midpoint of the geolocation segment on the reference ground track.
source: ATL03G ATBD, Section 3.4
valid_min: -180.00000000000000
valid_max: 180.00000000000000
origname: reference_photon_lon
fullnamepath: /gt3r/geolocation/reference_photon_lon
coordinates: gt3r_geolocation_delta_time
gt3r_geolocation_sigma_across: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: across-track geolocation uncertainty
description: Estimated Cartesian across-track uncertainity (1-sigma) for the refrerence photon
source: ATL03G ATBD
origname: sigma_across
fullnamepath: /gt3r/geolocation/sigma_across
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_sigma_lon: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: degrees
long_name: longitude uncertainty
description: Estimated geodetic east Longitude uncertainty (1-sigma), for the reference photon bounce point.
source: ATL03G ATBD, Section 3.6
origname: sigma_lon
fullnamepath: /gt3r/geolocation/sigma_lon
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_ref_azimuth: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: radians
long_name: Azimuth
standard_name: azimuth
description: Azimuth of the unit pointing vector for the reference photon in the local ENU frame in radians. The angle is measured from North and positive towards East.
source: ATL03G ATBD, Section 3.3
origname: ref_azimuth
fullnamepath: /gt3r/geolocation/ref_azimuth
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_ref_elev: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: radians
long_name: elevation
standard_name: elevation
description: Elevation of the unit pointing vector for the reference photon in the local ENU frame in radians. The angle is measured from East-North plane and positive towards Up
source: ATL03G ATBD, Section 3.3
origname: ref_elev
fullnamepath: /gt3r/geolocation/ref_elev
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_neutat_ht: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Neutral atmosphere ref height
description: Reference height of the neutral atmosphere range correction
source: ATL03a ATBD
origname: neutat_ht
fullnamepath: /gt3r/geolocation/neutat_ht
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_solar_azimuth: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: degrees_east
long_name: solar azimuth
description: The azimuth of the sun position vector from the reference photon bounce point position in the local ENU frame. The angle is measured from North and is positive towards East. ATL03g provides this value in radians; it is converted to degrees for ATL03 output.
source: ATL03G ATBD, Section 3.3
origname: solar_azimuth
fullnamepath: /gt3r/geolocation/solar_azimuth
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_surf_type: Array of 16 bit Integers [gt3r_geolocation_delta_time = 0..149895][ds_surf_type = 0..4]
units: 1
contentType: referenceInformation
long_name: Surface Type
description: Flags describing which surface types this interval is associated with. 0=not type, 1=is type. Order of array is land, ocean, sea ice, land ice, inland water.
source: ATL03 ATBD, Section 4
flag_meanings: not_type is_type
flag_values: 0, 1
valid_min: 0
valid_max: 1
origname: surf_type
fullnamepath: /gt3r/geolocation/surf_type
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_sigma_lat: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: 1
long_name: latitude uncertainty
description: Estimated geodetic Latitude uncertainty (1-sigma), for the reference photon bounce point.
source: ATL03G ATBD, Section 3.6
origname: sigma_lat
fullnamepath: /gt3r/geolocation/sigma_lat
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_tx_pulse_width_lower: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: seconds
long_name: Transmit Pulse Energy Lower Width
description: The average distance between the lower threshold crossing times measured by the Start Pulse Detector.
source: ATL02 ATBD, Section 7.2
origname: tx_pulse_width_lower
fullnamepath: /gt3r/geolocation/tx_pulse_width_lower
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_sigma_along: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: along-track geolocation uncertainity
description: Estimated cartesian along-track uncertainanty (1-sigma) for the reference photon
source: ATL03G ATBD
origname: sigma_along
fullnamepath: /gt3r/geolocation/sigma_along
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_tx_pulse_skew_est: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: seconds
long_name: Transmit Pulse Skew Estimate
description: The difference between the averages of the lower and upper threshold crossing times. This is an estimate of the transmit pulse skew.
source: ATL02 ATBD, Section 7.2
origname: tx_pulse_skew_est
fullnamepath: /gt3r/geolocation/tx_pulse_skew_est
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_tx_pulse_energy: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: Joules
contentType: physicalMeasurement
long_name: Transmit Pulse Energy
description: The average transmit pulse energy, measured by the internal laser energy monitor, split into per-beam measurements.
source: ATL02 ATBD, Section 7.2
origname: tx_pulse_energy
fullnamepath: /gt3r/geolocation/tx_pulse_energy
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_tx_pulse_width_upper: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: seconds
long_name: Transmit Pulse Energy Upper Width
description: The average distance between the upper threshold crossing times measured by the Start Pulse Detector.
source: ATL02 ATBD, Section 7.2
origname: tx_pulse_width_upper
fullnamepath: /gt3r/geolocation/tx_pulse_width_upper
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_sigma_h: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: 1
long_name: height uncertainty
description: Estimated height uncertainty (1-sigma) for the reference photon bounce point.
source: ATL03G ATBD, Section 3.6
origname: sigma_h
fullnamepath: /gt3r/geolocation/sigma_h
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_podppd_flag: Array of 16 bit Integers [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 0
units: 1
long_name: POD_PPD Flag
description: Composite POD/PPD flag that indicates the quality of input geolocation products for the specific ATL03 segment. A non-zero value may indicate that geolocation solutions are degraded. The ATL03 sigma values should indicate the degree of uncertainty associated with the degredation. Possible values are: 0=NOMINAL; 1=LRS; 2=LASERS; 3=GYRO; 4=SST1; 5=SST2; 6=ATT_INTERP; 7=MANEUVER; 8=GPS_DATA_GAP; 9-ST_BLINDING; 10=OTHER. Values 1-6 (PPD) are prioritized over values 7-10 (POD). In the case where both POD and PPD report an error, only the PAD value is indicated.
source: ANC04, ANC05
flag_meanings: nominal lrs lasers gyro sst1 sst2 att_interp maneuver gps_data_gap st_blinding other
flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
valid_min: 0
valid_max: 10
origname: podppd_flag
fullnamepath: /gt3r/geolocation/podppd_flag
coordinates: gt3r_geolocation_delta_time
gt3r_geolocation_velocity_sc: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895][ds_xyz = 0..2]
_FillValue: 3.402823466e+38
units: meters/second
long_name: spacecraft velocity
description: Spacecraft velocity components (east component, north component, up component) an observer on the ground would measure. While values are common to all beams, this parameter is naturally produced as part of geolocation.
source: ATL03G ATBD
origname: velocity_sc
fullnamepath: /gt3r/geolocation/velocity_sc
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_segment_id: Array of 32 bit Integers [gt3r_geolocation_delta_time = 0..149895]
units: 1
contentType: referenceInformation
long_name: along-track segment ID number.
description: A 7 digit number identifiying the along-track geolocation segment number. These are sequential, starting with 1 for the first segment after an ascending equatorial crossing node.
source: ATL03 ATBD, Section 3.1
origname: segment_id
fullnamepath: /gt3r/geolocation/segment_id
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_reference_photon_lat: Array of 64 bit Reals [gt3r_geolocation_delta_time = 0..149895]
units: degrees_north
long_name: Segment Latitude
standard_name: latitude
description: Latitude of each reference photon. Computed from the ECF Cartesian coordinates of the bounce point. In the case of no photons within the segment (segment_ph_cnt=0), the coordinates are the midpoint of the geolocation segment on the reference ground track.
source: ATL03G ATBD, Section 3.4
valid_min: -90.000000000000000
valid_max: 90.000000000000000
origname: reference_photon_lat
fullnamepath: /gt3r/geolocation/reference_photon_lat
coordinates: gt3r_geolocation_delta_time
gt3r_geolocation_solar_elevation: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: degrees
long_name: solar elevation
description: The elevation of the sun position vector from the reference photon bounce point position in the local ENU frame. The angle is measured from the East-North plane and is positive Up. ATL03g provides this value in radians; it is converted to degress for ATL03 output.
source: ATL03G ATBD, Section 3.3
origname: solar_elevation
fullnamepath: /gt3r/geolocation/solar_elevation
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_bounce_time_offset: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: seconds
long_name: ground bounce time offset
description: The difference between the transmit time and the ground bounce time of the reference photons.
source: ATL03 ATBD, Section 3.3
origname: bounce_time_offset
fullnamepath: /gt3r/geolocation/bounce_time_offset
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_reference_photon_index: Array of 32 bit Integers [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 0
units: counts
long_name: Reference Photon Index
description: Index of the reference photon within the set of photons grouped within in segment. To recover the position of the reference photon within the photon-rate arrays, add ref_ph_ndx to the corresponding ph_ndx_beg and subtract 1. If no reference photon was selected, this value will indicate that the reference photon defaulted to the first photon. In the case of no photons within the segment (segment_ph_cnt=0), the value should be 0.
source: ATL03 ATBD, Section 3.2
origname: reference_photon_index
fullnamepath: /gt3r/geolocation/reference_photon_index
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_altitude_sc: Array of 64 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 1.7976931348623157e+308
units: meters
long_name: Altitude
description: Height of the spacecraft above the WGS84 ellipsoid.
source: ATL03g ATBD, Section 3.4
origname: altitude_sc
fullnamepath: /gt3r/geolocation/altitude_sc
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_segment_dist_x: Array of 64 bit Reals [gt3r_geolocation_delta_time = 0..149895]
units: meters
long_name: Segment Distance from EQC
description: Along-track distance from the equator crossing to the start of the 20 meter geolocation segment.
source: Derived
origname: segment_dist_x
fullnamepath: /gt3r/geolocation/segment_dist_x
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geolocation_neutat_delay_total: Array of 32 bit Reals [gt3r_geolocation_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Total Neutral Atmospheric Delay
description: Total neutral atmosphere delay correction (wet+dry).
source: ATL03a ATBD
origname: neutat_delay_total
fullnamepath: /gt3r/geolocation/neutat_delay_total
coordinates: gt3r_geolocation_delta_time gt3r_geolocation_reference_photon_lat gt3r_geolocation_reference_photon_lon
gt3r_geophys_corr_tide_oc_pole: Array of 32 bit Reals [gt3r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Ocean Pole Tide
description: Surface deformation of the Earth due to loading from the centrifugal effect of polar motion upon the oceans (-2 to 2 mm).
source: ATL03 ATBD, Section 6.3.6
origname: tide_oc_pole
fullnamepath: /gt3r/geophys_corr/tide_oc_pole
coordinates: gt3r_geophys_corr_delta_time
gt3r_geophys_corr_dem_flag: Array of 16 bit Integers [gt3r_geophys_corr_delta_time = 0..149895]
_FillValue: 127
units: 1
contentType: referenceInformation
long_name: dem source flag
description: Indicates source of the DEM height. Values: 0=None, 1=Arctic, 2=GMTED, 3=MSS, 4=Antarctic.
source: ATL03 ATBD Section 6.3
flag_meanings: none arctic gmted mss antarctic
flag_values: 0, 1, 2, 3, 4
valid_min: 0
valid_max: 4
origname: dem_flag
fullnamepath: /gt3r/geophys_corr/dem_flag
coordinates: gt3r_geophys_corr_delta_time
gt3r_geophys_corr_tide_ocean: Array of 32 bit Reals [gt3r_geophys_corr_delta_time = 0..149895]
long_name: Ocean Tide
_FillValue: 3.402823466e+38
units: meters
description: Ocean Tides including diurnal and semi-diurnal (harmonic analysis), and longer period tides (dynamic and self-consistent equilibrium). This correction is not applied to the photon heights and provided only as supplemental information.
source: ATL03 ATBD, Section 6.3.1
origname: tide_ocean
fullnamepath: /gt3r/geophys_corr/tide_ocean
coordinates: gt3r_geophys_corr_delta_time
gt3r_geophys_corr_tide_earth: Array of 32 bit Reals [gt3r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Earth Tide
description: Solid Earth Tides
source: ATL03 ATBD, Section 6.3.3
origname: tide_earth
fullnamepath: /gt3r/geophys_corr/tide_earth
coordinates: gt3r_geophys_corr_delta_time
gt3r_geophys_corr_dac: Array of 32 bit Reals [gt3r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Dynamic Atmosphere Correction
description: Dynamic Atmospheric Correction (DAC) includes inverted barometer (IB) effect. This correction is not applied to the photon heights and provided only as supplemental information.
source: ATL03 ATBD, Section 6.3.2
origname: dac
fullnamepath: /gt3r/geophys_corr/dac
coordinates: gt3r_geophys_corr_delta_time
gt3r_geophys_corr_tide_load: Array of 32 bit Reals [gt3r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Load Tide
description: Load Tide - Local displacement due to Ocean Loading (-6 to 0 cm).
source: ATL03 ATBD, Section 6.3.4
origname: tide_load
fullnamepath: /gt3r/geophys_corr/tide_load
coordinates: gt3r_geophys_corr_delta_time
gt3r_geophys_corr_dem_h: Array of 32 bit Reals [gt3r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
contentType: referenceInformation
long_name: DEM Height
description: Best available DEM (in priority of Arctic/Antarctic/GMTED/MSS) value at the location of the reference photon.
source: ATL03 ATBD Section 6.3
origname: dem_h
fullnamepath: /gt3r/geophys_corr/dem_h
coordinates: gt3r_geophys_corr_delta_time
gt3r_geophys_corr_tide_equilibrium: Array of 32 bit Reals [gt3r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
contentType: referenceInformation
long_name: Long Period Equilibrium Tide
description: Long period equilibrium tide self-consistent with ocean tide model (+-0.04m). This correction is not applied to the photon heights and is provided only as a supplemental information.
source: ATL03 ATBD, Section 6.3.1
origname: tide_equilibrium
fullnamepath: /gt3r/geophys_corr/tide_equilibrium
coordinates: gt3r_geophys_corr_delta_time
gt3r_geophys_corr_geoid: Array of 32 bit Reals [gt3r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Geoid
description: Geoid height above WGS-84 reference ellipsoid (range -107 to 86m). Not applied on the product; requested by higher-level products.
source: ATL03 ATBD, Section 6.3.8
origname: geoid
fullnamepath: /gt3r/geophys_corr/geoid
coordinates: gt3r_geophys_corr_delta_time
gt3r_geophys_corr_tide_pole: Array of 32 bit Reals [gt3r_geophys_corr_delta_time = 0..149895]
_FillValue: 3.402823466e+38
units: meters
long_name: Solid Earth Pole Tide
description: Solid Earth Pole Tide -Rotational deformation due to polar motion (-1.5 to 1.5 cm).
source: ATL03 ATBD, Section 6.3.5
origname: tide_pole
fullnamepath: /gt3r/geophys_corr/tide_pole
coordinates: gt3r_geophys_corr_delta_time
gt3r_signal_find_output_ocean_bckgrd_mean: Array of 32 bit Reals [gt3r_signal_find_output_ocean_delta_time = 0..73066]
_FillValue: 3.402823466e+38
units: counts
long_name: background counts per bin
description: The mean of the number of background counts expected in one height bin of the histogram of width dzATM over time period, dtATM
source: ATL03 ATBD, Section 5
origname: bckgrd_mean
fullnamepath: /gt3r/signal_find_output/ocean/bckgrd_mean
coordinates: gt3r_signal_find_output_ocean_delta_time
gt3r_signal_find_output_ocean_bckgrd_sigma: Array of 32 bit Reals [gt3r_signal_find_output_ocean_delta_time = 0..73066]
_FillValue: 3.402823466e+38
units: counts
long_name: background counts per bin sigma
description: The standard deviation of the number of background counts expected in one height bin of the histogram of width dzATM over time period, dtATM
source: ATL03 ATBD, Section 5
origname: bckgrd_sigma
fullnamepath: /gt3r/signal_find_output/ocean/bckgrd_sigma
coordinates: gt3r_signal_find_output_ocean_delta_time
gt3r_signal_find_output_ocean_t_pc_delta: Array of 32 bit Reals [gt3r_signal_find_output_ocean_delta_time = 0..73066]
_FillValue: 3.402823466e+38
units: seconds
long_name: bin width size
description: The histogram bin width (integration time) along-track used to find signal photons.
source: ATL03 ATBD, Section 5
origname: t_pc_delta
fullnamepath: /gt3r/signal_find_output/ocean/t_pc_delta
coordinates: gt3r_signal_find_output_ocean_delta_time
gt3r_signal_find_output_ocean_z_pc_delta: Array of 32 bit Reals [gt3r_signal_find_output_ocean_delta_time = 0..73066]
_FillValue: 3.402823466e+38
units: meters
long_name: bin height size
description: Height bin size of the histogram used to find signal photons.
source: ATL03 ATBD, Section 5
origname: z_pc_delta
fullnamepath: /gt3r/signal_find_output/ocean/z_pc_delta
coordinates: gt3r_signal_find_output_ocean_delta_time
gt3r_heights_ph_id_count: Array of 16 bit Integers [gt3r_heights_delta_time = 0..1431749]
units: counts
long_name: photon event counter
description: The photon event counter is part of photon ID and counts from 1 for each channel until reset by laser pulse counter.
source: Derived as part of Photon ID
contentType: referenceInformation
origname: ph_id_count
fullnamepath: /gt3r/heights/ph_id_count
coordinates: gt3r_heights_delta_time gt3r_heights_lat_ph gt3r_heights_lon_ph
gt3r_heights_lat_ph: Array of 64 bit Reals [gt3r_heights_delta_time = 0..1431749]
units: degrees_north
long_name: Latitude
standard_name: latitude
description: Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point.
source: ATL03g ATBD, Section 3.4
valid_min: -90.000000000000000
valid_max: 90.000000000000000
origname: lat_ph
fullnamepath: /gt3r/heights/lat_ph
coordinates: gt3r_heights_delta_time gt3r_heights_lon_ph
gt3r_heights_dist_ph_along: Array of 32 bit Reals [gt3r_heights_delta_time = 0..1431749]
units: meters
long_name: Distance from equator crossing.
description: Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack.
source: ATL03 ATBD, Section 3.1
origname: dist_ph_along
fullnamepath: /gt3r/heights/dist_ph_along
coordinates: gt3r_heights_delta_time gt3r_heights_lat_ph gt3r_heights_lon_ph
gt3r_heights_signal_conf_ph: Array of 16 bit Integers [gt3r_heights_delta_time = 0..1431749][ds_surf_type = 0..4]
units: 1
contentType: qualityInformation
long_name: Photon Signal Confidence
description: Confidence level associated with each photon event selected as signal. 0=noise. 1=added to allow for buffer but algorithm classifies as background; 2=low; 3=med; 4=high). This parameter is a 5xN array where N is the number of photons in the granule, and the 5 rows indicate signal finding for each surface type (in order: land, ocean, sea ice, land ice and inland water). Events not associated with a specific surface type have a confidence level of -1. Events evaluated as TEP returns have a confidence level of -2.
source: ATL03 ATBD, Section 5, Conf
flag_meanings: possible_tep not_considered noise buffer low medium high
flag_values: -2, -1, 0, 1, 2, 3, 4
valid_min: -2
valid_max: 4
origname: signal_conf_ph
fullnamepath: /gt3r/heights/signal_conf_ph
coordinates: gt3r_heights_delta_time gt3r_heights_lat_ph gt3r_heights_lon_ph
gt3r_heights_ph_id_pulse: Array of Bytes [gt3r_heights_delta_time = 0..1431749]
units: counts
contentType: referenceInformation
long_name: laser pulse counter
description: The laser pulse counter is part of photon ID and counts from 1 to 200 and is reset for each new major frame.
source: Derived as part of Photon ID
origname: ph_id_pulse
fullnamepath: /gt3r/heights/ph_id_pulse
coordinates: gt3r_heights_delta_time gt3r_heights_lat_ph gt3r_heights_lon_ph
gt3r_heights_h_ph: Array of 32 bit Reals [gt3r_heights_delta_time = 0..1431749]
units: meters
contentType: physicalMeasurement
long_name: Photon WGS84 Height
standard_name: height
description: Height of each received photon, relative to the WGS-84 ellipsoid including the geophysical corrections noted in Section 6. Please note that neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights.
source: ATL03g ATBD, Section 3.4
origname: h_ph
fullnamepath: /gt3r/heights/h_ph
coordinates: gt3r_heights_delta_time gt3r_heights_lat_ph gt3r_heights_lon_ph
gt3r_heights_ph_id_channel: Array of Bytes [gt3r_heights_delta_time = 0..1431749]
units: 1
contentType: referenceInformation
long_name: Receive channel id
description: Channel number assigned for each received photon event. This is part of the photon ID. Values range from 1 to 120 to span all channels and rise/fall edges. Values 1 to 60 are for falling edge; PCE1 (1 to 20), PCE 2 (21 to 40) and PCE3 (41 to 60). Values 61 to 120 are for rising edge; PCE1 (61 to 80), PCE 2 (81 to 100) and PC3 (101 to 120).
source: Derived as part of Photon ID
valid_min: 1
valid_max: 120
origname: ph_id_channel
fullnamepath: /gt3r/heights/ph_id_channel
coordinates: gt3r_heights_delta_time gt3r_heights_lat_ph gt3r_heights_lon_ph
gt3r_heights_lon_ph: Array of 64 bit Reals [gt3r_heights_delta_time = 0..1431749]
units: degrees_east
long_name: Longitude
standard_name: longitude
description: Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point.
source: ATL03g ATBD, Section 3.4
valid_min: -180.00000000000000
valid_max: 180.00000000000000
origname: lon_ph
fullnamepath: /gt3r/heights/lon_ph
coordinates: gt3r_heights_delta_time gt3r_heights_lat_ph
gt3r_heights_pce_mframe_cnt: Array of 32 bit Unsigned integers [gt3r_heights_delta_time = 0..1431749]
units: counts
contentType: referenceInformation
long_name: PCE Major frame counter
description: The major frame counter is read from the digital flow controller in a given PCE card. The counter identifies individual major frames across diag and science packets. Used as part of the photon ID.
source: Retained from prior a_alt_science_ph packet
origname: pce_mframe_cnt
fullnamepath: /gt3r/heights/pce_mframe_cnt
coordinates: gt3r_heights_delta_time gt3r_heights_lat_ph gt3r_heights_lon_ph
gt3r_heights_dist_ph_across: Array of 32 bit Reals [gt3r_heights_delta_time = 0..1431749]
units: meters
long_name: Distance off RGT.
description: Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1.
source: ATL03 ATBD, Section 3.1
origname: dist_ph_across
fullnamepath: /gt3r/heights/dist_ph_across
coordinates: gt3r_heights_delta_time gt3r_heights_lat_ph gt3r_heights_lon_ph
ancillary_data_atlas_engineering_ds_gt: Array of 16 bit Integers [ancillary_data_atlas_engineering_ds_gt = 0..5]
units: 1
contentType: referenceInformation
long_name: GT Index
description: Dimension scale for ATLAS Groundtracks (gt1l, gt1r, gt2l, gt2r, gt3l, gt3r)
flag_meanings: gt1l gt1r gt2l gt2r gt3l gt3r
flag_values: 1, 2, 3, 4, 5, 6
valid_min: 1
valid_max: 6
origname: ds_gt
fullnamepath: /ancillary_data/atlas_engineering/ds_gt
ancillary_data_atlas_engineering_ds_stat: Array of 16 bit Integers [ancillary_data_atlas_engineering_ds_stat = 0..3]
units: 1
contentType: referenceInformation
long_name: Stat Index
description: Dimension scale for statistics in the order mean, sdev, min, max
flag_meanings: mean sdev min max
flag_values: 1, 2, 3, 4
valid_min: 1
valid_max: 5
origname: ds_stat
fullnamepath: /ancillary_data/atlas_engineering/ds_stat
ancillary_data_calibrations_ds_channel: Array of 16 bit Integers [ancillary_data_calibrations_ds_channel = 0..19]
units: 1
contentType: referenceInformation
long_name: Channel
description: Dimension scale for ATLAS PCE channels (1-16=strong, 17-20=weak)
valid_min: 1
valid_max: 20
origname: ds_channel
fullnamepath: /ancillary_data/calibrations/ds_channel
ancillary_data_calibrations_low_link_impulse_response_hist_x: Array of 64 bit Reals [ancillary_data_calibrations_low_link_impulse_response_hist_x = 0..1999]
units: 1
contentType: auxiliaryInformation
long_name: Histogram Bin X Values
description: Histogram bin x-values
source: CAL20
origname: hist_x
fullnamepath: /ancillary_data/calibrations/low_link_impulse_response/hist_x
ancillary_data_start_delta_time: Array of 64 bit Reals [ancillary_data_start_delta_time = 0..0]
units: seconds since 2018-01-01
contentType: auxiliaryInformation
long_name: ATLAS Start Time (Actual)
standard_name: time
description: Number of GPS seconds since the ATLAS SDP epoch at the first data point in the file. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: Derived
origname: start_delta_time
fullnamepath: /ancillary_data/start_delta_time
ancillary_data_tep_ds_gt: Array of 16 bit Integers [ancillary_data_tep_ds_gt = 0..5]
units: 1
contentType: referenceInformation
long_name: GT Index
description: Dimension scale for ATLAS Groundtracks (gt1l, gt1r, gt2l, gt2r, gt3l, gt3r)
flag_meanings: gt1l gt1r gt2l gt2r gt3l gt3r
flag_values: 1, 2, 3, 4, 5, 6
valid_min: 1
valid_max: 6
origname: ds_gt
fullnamepath: /ancillary_data/tep/ds_gt
atlas_impulse_response_pce1_spot1_tep_histogram_tep_hist_time: Array of 64 bit Reals [atlas_impulse_response_pce1_spot1_tep_histogram_tep_hist_time = 0..1999]
units: seconds
long_name: TEP Histogram Time
description: The times associated with the TEP histogram bin centers, measured from the laser transmit time.
source: ATL02 ATBD, Section 7.2
origname: tep_hist_time
fullnamepath: /atlas_impulse_response/pce1_spot1/tep_histogram/tep_hist_time
atlas_impulse_response_pce1_spot1_tep_histogram_tep_tod: Array of 64 bit Reals [atlas_impulse_response_pce1_spot1_tep_histogram_tep_tod = 0..0]
units: seconds since 2018-01-01
long_name: TEP Time Of Day
standard_name: time
description: The time of day at of the start of the data within the TEP histogram, in seconds since the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: ATL02 ATBD, Section 7.2
origname: tep_tod
fullnamepath: /atlas_impulse_response/pce1_spot1/tep_histogram/tep_tod
atlas_impulse_response_pce2_spot3_tep_histogram_tep_hist_time: Array of 64 bit Reals [atlas_impulse_response_pce2_spot3_tep_histogram_tep_hist_time = 0..1999]
units: seconds
long_name: TEP Histogram Time
description: The times associated with the TEP histogram bin centers, measured from the laser transmit time.
source: ATL02 ATBD, Section 7.2
origname: tep_hist_time
fullnamepath: /atlas_impulse_response/pce2_spot3/tep_histogram/tep_hist_time
atlas_impulse_response_pce2_spot3_tep_histogram_tep_tod: Array of 64 bit Reals [atlas_impulse_response_pce2_spot3_tep_histogram_tep_tod = 0..0]
units: seconds since 2018-01-01
long_name: TEP Time Of Day
standard_name: time
description: The time of day at of the start of the data within the TEP histogram, in seconds since the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: ATL02 ATBD, Section 7.2
origname: tep_tod
fullnamepath: /atlas_impulse_response/pce2_spot3/tep_histogram/tep_tod
ds_surf_type: Array of 32 bit Integers [ds_surf_type = 0..4]
units: 1
contentType: auxiliaryInformation
long_name: Surface Type Dimension Scale
description: Dimension scale indexing the surface type array. Index=1 corresponds to Land; index = 2 corresponds to Ocean; Index = 3 corresponds to SeaIce; Index=4 corresponds to LandIce; Index=5 corresponds to InlandWater
flag_meanings: land ocean seaice landice inland_water
flag_values: 1, 2, 3, 4, 5
valid_min: 1
valid_max: 5
origname: ds_surf_type
fullnamepath: /ds_surf_type
ds_xyz: Array of 32 bit Integers [ds_xyz = 0..2]
units: 1
contentType: auxiliaryInformation
long_name: XYZ Dimension Scale
description: Dimension scale indexing the XYZ components of velocity_sc. Index=1 corresponds to X; index = 2 corresponds to Y; Index = 3 corresponds to Z;
flag_meanings: x y z
flag_values: 1, 2, 3
valid_min: 1
valid_max: 3
origname: ds_xyz
fullnamepath: /ds_xyz
gt1r_bckgrd_atlas_delta_time: Array of 64 bit Reals [gt1r_bckgrd_atlas_delta_time = 0..83959]
units: seconds since 2018-01-01
long_name: Time at the start of ATLAS 50-shot sum
standard_name: time
description: Elapsed GPS Seconds from the ATLAS SDP GPS Epoch, referenced to the start of the 50-shot sum. This is based on every fiftieth laser fire time, which leads to a very close alignment with major frame boundaries (+/- 1 shot). The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: ATL02
origname: delta_time
fullnamepath: /gt1r/bckgrd_atlas/delta_time
gt1r_geolocation_delta_time: Array of 64 bit Reals [gt1r_geolocation_delta_time = 0..149895]
units: seconds since 2018-01-01
contentType: physicalMeasurement
long_name: Delta Time
standard_name: time
description: Transmit time of the reference photon, measured in seconds from the atlas_sdp_gps_epoch. If there is no reference photon, this time corresponds to the approximate mid-point time associated with the along-track geolocation segment edge. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: Derived
coordinates: reference_photon_lat, reference_photon_lon
origname: delta_time
fullnamepath: /gt1r/geolocation/delta_time
gt1r_geophys_corr_delta_time: Array of 64 bit Reals [gt1r_geophys_corr_delta_time = 0..149895]
units: seconds since 2018-01-01
contentType: referenceInformation
long_name: Elapsed GPS seconds
standard_name: time
description: Elapsed seconds from the ATLAS SDP GPS Epoch, corresponding to the transmit time of the reference photon. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: Operations
origname: delta_time
fullnamepath: /gt1r/geophys_corr/delta_time
gt1r_heights_delta_time: Array of 64 bit Reals [gt1r_heights_delta_time = 0..1319586]
units: seconds since 2018-01-01
contentType: referenceInformation
long_name: Elapsed GPS seconds
standard_name: time
description: The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: Operations
coordinates: lat_ph lon_ph
origname: delta_time
fullnamepath: /gt1r/heights/delta_time
gt1r_signal_find_output_ocean_delta_time: Array of 64 bit Reals [gt1r_signal_find_output_ocean_delta_time = 0..72818]
units: seconds since 2018-01-01
contentType: physicalMeasurement
long_name: Elapsed GPS seconds
standard_name: time
description: Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: Derived via Time Tagging
origname: delta_time
fullnamepath: /gt1r/signal_find_output/ocean/delta_time
gt2r_bckgrd_atlas_delta_time: Array of 64 bit Reals [gt2r_bckgrd_atlas_delta_time = 0..84047]
units: seconds since 2018-01-01
long_name: Time at the start of ATLAS 50-shot sum
standard_name: time
description: Elapsed GPS Seconds from the ATLAS SDP GPS Epoch, referenced to the start of the 50-shot sum. This is based on every fiftieth laser fire time, which leads to a very close alignment with major frame boundaries (+/- 1 shot). The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: ATL02
origname: delta_time
fullnamepath: /gt2r/bckgrd_atlas/delta_time
gt2r_geolocation_delta_time: Array of 64 bit Reals [gt2r_geolocation_delta_time = 0..149895]
units: seconds since 2018-01-01
contentType: physicalMeasurement
long_name: Delta Time
standard_name: time
description: Transmit time of the reference photon, measured in seconds from the atlas_sdp_gps_epoch. If there is no reference photon, this time corresponds to the approximate mid-point time associated with the along-track geolocation segment edge. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: Derived
coordinates: reference_photon_lat, reference_photon_lon
origname: delta_time
fullnamepath: /gt2r/geolocation/delta_time
gt2r_geophys_corr_delta_time: Array of 64 bit Reals [gt2r_geophys_corr_delta_time = 0..149895]
units: seconds since 2018-01-01
contentType: referenceInformation
long_name: Elapsed GPS seconds
standard_name: time
description: Elapsed seconds from the ATLAS SDP GPS Epoch, corresponding to the transmit time of the reference photon. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: Operations
origname: delta_time
fullnamepath: /gt2r/geophys_corr/delta_time
gt2r_heights_delta_time: Array of 64 bit Reals [gt2r_heights_delta_time = 0..1043505]
units: seconds since 2018-01-01
contentType: referenceInformation
long_name: Elapsed GPS seconds
standard_name: time
description: The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: Operations
coordinates: lat_ph lon_ph
origname: delta_time
fullnamepath: /gt2r/heights/delta_time
gt2r_signal_find_output_ocean_delta_time: Array of 64 bit Reals [gt2r_signal_find_output_ocean_delta_time = 0..72106]
units: seconds since 2018-01-01
contentType: physicalMeasurement
long_name: Elapsed GPS seconds
standard_name: time
description: Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: Derived via Time Tagging
origname: delta_time
fullnamepath: /gt2r/signal_find_output/ocean/delta_time
gt3r_bckgrd_atlas_delta_time: Array of 64 bit Reals [gt3r_bckgrd_atlas_delta_time = 0..84205]
units: seconds since 2018-01-01
long_name: Time at the start of ATLAS 50-shot sum
standard_name: time
description: Elapsed GPS Seconds from the ATLAS SDP GPS Epoch, referenced to the start of the 50-shot sum. This is based on every fiftieth laser fire time, which leads to a very close alignment with major frame boundaries (+/- 1 shot). The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: ATL02
origname: delta_time
fullnamepath: /gt3r/bckgrd_atlas/delta_time
gt3r_geolocation_delta_time: Array of 64 bit Reals [gt3r_geolocation_delta_time = 0..149895]
units: seconds since 2018-01-01
contentType: physicalMeasurement
long_name: Delta Time
standard_name: time
description: Transmit time of the reference photon, measured in seconds from the atlas_sdp_gps_epoch. If there is no reference photon, this time corresponds to the approximate mid-point time associated with the along-track geolocation segment edge. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: Derived
coordinates: reference_photon_lat, reference_photon_lon
origname: delta_time
fullnamepath: /gt3r/geolocation/delta_time
gt3r_geophys_corr_delta_time: Array of 64 bit Reals [gt3r_geophys_corr_delta_time = 0..149895]
units: seconds since 2018-01-01
contentType: referenceInformation
long_name: Elapsed GPS seconds
standard_name: time
description: Elapsed seconds from the ATLAS SDP GPS Epoch, corresponding to the transmit time of the reference photon. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: Operations
origname: delta_time
fullnamepath: /gt3r/geophys_corr/delta_time
gt3r_heights_delta_time: Array of 64 bit Reals [gt3r_heights_delta_time = 0..1431749]
units: seconds since 2018-01-01
contentType: referenceInformation
long_name: Elapsed GPS seconds
standard_name: time
description: The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: Operations
coordinates: lat_ph lon_ph
origname: delta_time
fullnamepath: /gt3r/heights/delta_time
gt3r_signal_find_output_ocean_delta_time: Array of 64 bit Reals [gt3r_signal_find_output_ocean_delta_time = 0..73066]
units: seconds since 2018-01-01
contentType: physicalMeasurement
long_name: Elapsed GPS seconds
standard_name: time
description: Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: Derived via Time Tagging
origname: delta_time
fullnamepath: /gt3r/signal_find_output/ocean/delta_time
orbit_info_crossing_time: Array of 64 bit Reals [orbit_info_crossing_time = 0..0]
units: seconds since 2018-01-01
contentType: referenceInformation
long_name: Ascending Node Crossing Time
standard_name: time
description: The time, in seconds since the ATLAS SDP GPS Epoch, at which the ascending node crosses the equator. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: POD/PPD
origname: crossing_time
fullnamepath: /orbit_info/crossing_time
orbit_info_sc_orient_time: Array of 64 bit Reals [orbit_info_sc_orient_time = 0..0]
units: seconds since 2018-01-01
contentType: referenceInformation
long_name: Time of Last Spacecraft Orientation Change
standard_name: time
description: The time of the last spacecraft orientation change between forward, backward and transitional flight modes, expressed in seconds since the ATLAS SDP GPS Epoch. ICESat-2 is considered to be flying forward when the weak beams are leading the strong beams; and backward when the strong beams are leading the weak beams. ICESat-2 is considered to be in transition while it is maneuvering between the two orientations. Science quality is potentially degraded while in transition mode. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: POD/PPD
origname: sc_orient_time
fullnamepath: /orbit_info/sc_orient_time
quality_assessment_delta_time: Array of 64 bit Reals [quality_assessment_delta_time = 0..0]
units: seconds since 2018-01-01
contentType: referenceInformation
long_name: Elapsed GPS seconds
standard_name: time
description: Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed.
source: Operations
origname: delta_time
fullnamepath: /quality_assessment/delta_time
FakeDim0: Array of 32 bit Integers [FakeDim0 = 0..0]
units: level
FakeDim1: Array of 32 bit Integers [FakeDim1 = 0..4]
units: level
FakeDim2: Array of 32 bit Integers [FakeDim2 = 0..5]
units: level
FakeDim3: Array of 32 bit Integers [FakeDim3 = 0..159]
units: level
FakeDim4: Array of 32 bit Integers [FakeDim4 = 0..497]
units: level
FakeDim5: Array of 32 bit Integers [FakeDim5 = 0..1]
units: level