| short_name: | ATL13 |
| level: | L3A |
| title: | SET_BY_META |
| description: | This data set (ATL13) contains along track surface heights of inland water bodies, including lakes, estuaries and rivers. Water surface slope and descriptive statistics are also provided. The data were acquired by the Advanced Topographic Laser Altimeter S |
| Conventions: | CF-1.6 |
| contributor_name: | Thomas A 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 |
| date_type: | UTC |
| featureType: | trajectory |
| geospatial_lat_units: | degrees_north |
| geospatial_lon_units: | degrees_east |
| granule_type: | ATL13 |
| identifier_product_doi_authority: | http://dx.doi.org |
| 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: | 2023-06-14T00:56:11.000000Z |
| hdfversion: | HDF5 1.10.7 |
| history: | 2023-06-14T00:56:11.000000Z;29c0c907-2211-3a9a-a120-f4c26c96b657;Created by PGE atlas_l3a_iw Version 4.0 |
| identifier_file_uuid: | 29c0c907-2211-3a9a-a120-f4c26c96b657 |
| identifier_product_format_version: | 4.0 |
| time_coverage_duration: | 22630.000000000000 |
| time_coverage_end: | 2019-03-31T03:39:51.000000Z |
| time_coverage_start: | 2019-03-30T21:22:41.000000Z |
| geospatial_lat_min: | -90.000000000000000 |
| geospatial_lon_min: | -180.00000000000000 |
| geospatial_lat_max: | 90.000000000000000 |
| geospatial_lon_max: | 180.00000000000000 |
| 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/ |
| identifier_product_type: | ATL13 |
| identifier_product_doi: | doi:10.5067/ATLAS/ATL13.006 |
| institution: | National Aeronautics and Space Administration (NASA) |
| creator_name: | GSFC I-SIPS > ICESat-2 Science Investigator-led Processing System |
| summary: | The purpose of ATL13 is to provide along-track inland water surface heights and associated statistics. |
| keywords: | EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER FEATURES > 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: | 3A |
| 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: | gt1l_anom_ssegs_anom_sseg_time, gt1l_delta_time, gt1r_anom_ssegs_anom_sseg_time, gt1r_delta_time, gt2l_anom_ssegs_anom_sseg_time, gt2l_delta_time, gt2r_anom_ssegs_anom_sseg_time, gt2r_delta_time, gt3l_anom_ssegs_anom_sseg_time, gt3l_delta_time, gt3r_anom_ssegs_anom_sseg_time, gt3r_delta_time, orbit_info_crossing_time, orbit_info_sc_orient_time |
| orbit_info_cycle_number: | Array of 16 bit Integers [orbit_info_crossing_time = 0..3] long_name: Cycle Number units: 1 source: Operations valid_min: 0 valid_max: 50 contentType: referenceInformation description: A count of the number of exact repeats of this reference orbit. 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..3] long_name: Orbit Number units: 1 source: Operations valid_min: 1 valid_max: 65000 contentType: referenceInformation description: Unique identifying number for each planned ICESat-2 orbit. 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..3] long_name: Ascending Node Longitude units: degrees_east source: POD/PPD valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude at the ascending node crossing. 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] long_name: Spacecraft Orientation units: 1 source: POD/PPD valid_min: 0 valid_max: 2 contentType: referenceInformation 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. flag_meanings: backward forward transition flag_values: 0, 1, 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..3] long_name: Reference Ground track units: 1 source: POD/PPD valid_min: 1 valid_max: 1387 contentType: referenceInformation 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 GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs. origname: rgt fullnamepath: /orbit_info/rgt coordinates: orbit_info_crossing_time |
| gt1r_rgt: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] long_name: Reference Ground track units: 1 source: ATL03 valid_min: 1 valid_max: 1387 contentType: referenceInformation 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 1,387 RGTs. origname: rgt fullnamepath: /gt1r/rgt coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_azimuth: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Azimuth standard_name: azimuth units: radians source: ATL13 ATBD, Section 5.3.5 (A) contentType: auxiliaryInformation description: The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees. origname: segment_azimuth fullnamepath: /gt1r/segment_azimuth coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_qf_bias_fit: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Height Bias Fit Quality Flag units: 1 source: Inland Water ATBD valid_min: -3 valid_max: 4 contentType: qualityInformation description: The height bias fit flag is set based on the value of the goodness of fit bias estimated as the difference between the centroid elevations of the observed surface water histogram and fitted integrated water surface model histogram. The flag values are set as follows: = -3 if H_bias_fit < -0.10 (m); -2 if -0.10 <= H_bias_fit < -0.05;-1 when -0.05 <= H_bias_fit < -0.01; 0 if -0.01 <= H_bias_fit < 0.01 (m); 1 if 0.01 <= H_bias_fit < 0.05; 2 if 0.05 < H_bias_fit < 0.10; 3 if 0.10 <= H_bias_fit; 4 if H_bias_fit is invalid. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 equal_to_or_above_threshold6 invalid flag_values: -3, -2, -1, 0, 1, 2, 3, 4 origname: qf_bias_fit fullnamepath: /gt1r/qf_bias_fit coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_sseg_mean_lon: | Array of 64 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 1.7976931348623157e+308 long_name: Mean longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Mean longitude of the signal-qualified photons in a short segment. origname: sseg_mean_lon fullnamepath: /gt1r/sseg_mean_lon coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_cloud_flag_atm_atl09: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Cloud Flag Atm units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 10 contentType: modelResult description: Cloud flag from backscatter profile. origname: cloud_flag_atm_atl09 fullnamepath: /gt1r/cloud_flag_atm_atl09 coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_qf_ice: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Ice Quality Flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 3 contentType: qualityInformation description: The quality flag for ice describes the likelihood of ice on the short water body surface segment. 0 for QF_Bckgrd<= 2; 1 for 2 < QF_Bckgrd<= 4; 2 for 4 < QF_Bckgrd; 3 for (4 < QF_Bckgrd and QF_Cloud=1) flag_meanings: qf_bckgrd_le_2 qf_bckgrd_le_4 qf_bckgrd_gt_4 qf_bckgrd_w_cloud flag_values: 0, 1, 2, 3 origname: qf_ice fullnamepath: /gt1r/qf_ice coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_transect_id: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Transect ID units: 1 source: ATL13 ATBD, Section 5.3.2 (C) contentType: referenceInformation description: Transect within a water body to which the short segment rate output belongs. origname: transect_id fullnamepath: /gt1r/transect_id coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_inland_water_body_type: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Body type units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 1 valid_max: 9 contentType: referenceInformation description: Type of Inland Water Body, where 1=Lake, 2=Known Reservoir, 3=(Reserved for future use), 4=Ephemeral Water, 5=River, 6=Estuary or Bay, 7=Coastal Water, 8=Reserved, 9=Reserved flag_meanings: Lake Known_Reservoir Reserved_for_future_use Ephemeral_Water River Estuary_or_Bay Coastal_Water Reserved Reserved flag_values: 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_type fullnamepath: /gt1r/inland_water_body_type coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_inland_water_body_id: | Array of 32 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 2147483647 long_name: Body ID units: 1 source: ATL13 ATBD, Section 5.3.1 (C) contentType: referenceInformation description: Identifying signature of an individual inland water body. Each body of water is represented by a unique numeric value. origname: inland_water_body_id fullnamepath: /gt1r/inland_water_body_id coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_sseg_end_lon: | Array of 64 bit Reals [gt1r_delta_time = 0..50001] long_name: End longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude at which the short segment ends. May be a signal or non-signal photon. origname: sseg_end_lon fullnamepath: /gt1r/sseg_end_lon coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_qf_subsurface_attenuation: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Subsurface attenuation quality flag units: 1 source: ATL13 ATBD, Section 5.3.4 (A) valid_min: -2 valid_max: 2 contentType: qualityInformation description: Quality flag indicating whether or not the reported subsurface attenuation was constrained during deconvolution by the minimum (initial) limit in the possible range (QF=-1), the maximum limit in the possible range (QF = 1), or was allowed to settle on a solution within the possible range (QF=0). For analysis prior to deconvolution of the subsurface attenuation fit to the observations, the flag indicates whether the value determined by attempting to fit the observations was below (QF= -2), above (QF= 2), or within (QF=0) the possible range of expected values. When the default value for subsurface attenuation is chosen due to any condition other than those defined by an existing quality flag, QF=invalid. flag_meanings: obs_fit_below_range initial_limit within_range maximum_limit obs_fit_above_range flag_values: -2, -1, 0, 1, 2 origname: qf_subsurface_attenuation fullnamepath: /gt1r/qf_subsurface_attenuation coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_quality: | Array of 32 bit Integers [gt1r_delta_time = 0..50001][ds_sseg_quality = 0..3] _FillValue: 2147483647 long_name: Segment quality group count units: 1 source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Four-element array of describing, for each short segment n, the count of photons qualifying in each quality group. (n,1) = nominal, (n,2) = possible afterpulse, (n,3) = possible impulse response effect, (n,4) = possible TEP origname: segment_quality fullnamepath: /gt1r/segment_quality coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_geoid: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Segment Geoid units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Applicable mean-tide system geoid value at reporting location for all short segment statistics. (see geoid_free2mean to convert to the tide-free system.) origname: segment_geoid fullnamepath: /gt1r/segment_geoid coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_qf_sseg_length: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Short Segment Length flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 9 contentType: qualityInformation description: Length of short segments flag. The flag is set as follows: 0 if sseg_length < 10 (meters); 1 if 10 <= sseg_length < 20 (meters); 2 if 20 <= sseg_length < 30 (meters); 3 if 30 <= sseg_length < 50 (meters); 4 if 50 <= sseg_length < 75 (meters); 5 if 75 <= sseg_length < 100 (meters); 6 if 100 <= sseg_length < 150 (meters); 7 if 150 <= sseg_length < 200 (meters); 8 if 200 <= sseg_length < 300 (meters); 9 if 300 <= sseg_length. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 below_threshold7 below_threshold8 below_threshold9 equal_to_or_above_threshold9 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_sseg_length fullnamepath: /gt1r/qf_sseg_length coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_sseg_start_lon: | Array of 64 bit Reals [gt1r_delta_time = 0..50001] long_name: Start longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude at which the short segment begins. May be a signal or non-signal photon. origname: sseg_start_lon fullnamepath: /gt1r/sseg_start_lon coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_tide_equilibrium: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Segment Tide Equilibrium units: meters source: ATL03 contentType: auxiliaryInformation description: Long period equilibrium tide self-consistent with ocean tide model (+- 0.04 m). Although available at short segment rate for all water body types, value is provide mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_tide_equilibrium fullnamepath: /gt1r/segment_tide_equilibrium coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_qf_lseg_length: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Long Segment Length flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 3 contentType: qualityInformation description: The Long Segment Length flag is set based on the length of the long segment. The flag is set as follows: 0 if Lseg_length < 500 (meters); 1 if 50 <= Lseg_length < 1500 (meters); 2 if 150 <= Lseg_length < 3000 (meters); 3 if 3000 <= Lseg_length flag_meanings: below_threshold1 below_threshold2 below_threshold3 above_threshold4 flag_values: 0, 1, 2, 3 origname: qf_lseg_length fullnamepath: /gt1r/qf_lseg_length coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_significant_wave_ht: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: SWH units: meters source: section 5.3.3 (C) contentType: physicalMeasurement description: Significant wave height origname: significant_wave_ht fullnamepath: /gt1r/significant_wave_ht coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_bottom_lat: | Array of 64 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 1.7976931348623157e+308 long_name: Bottom latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of actual bottom location, based on the apparent bottom sseg_mean_lat / sseg_mean_lon location corrected for refraction effects. origname: bottom_lat fullnamepath: /gt1r/bottom_lat coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_cycle_number: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] long_name: Cycle Number units: counts source: ATL03 valid_min: 0 valid_max: 50 contentType: referenceInformation 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 1,387 and adding the RGT value. origname: cycle_number fullnamepath: /gt1r/cycle_number coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_qf_subsurface_backscat_ampltd: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Subsurface backscatter amplitude quality flag units: 1 source: ATL13 ATBD, Section 5.3.4 (A) valid_min: -2 valid_max: 2 contentType: qualityInformation description: Quality flag indicating whether or not the reported subsurface backscatter amplitude was constrained during deconvolution by the minimum limit in the possible range (QF=-1), the maximum limit in the possible range (QF = 1), or was allowed to settle on a solution within the possible range (QF=0). For analysis prior to deconvolution of the backscatter amplitude fit to the observations, the flag indicates whether the value determined by attempting to fit the observations was below (QF= -2), above (QF= 2), or within (QF=0) the possible range of expected values. When the default value for backscatter amplitude is chosen due to any condition other than those defined by an existing quality flag, QF=invalid. flag_meanings: obs_fit_below_range initial_limit within_range maximum_limit obs_fit_above_range flag_values: -2, -1, 0, 1, 2 origname: qf_subsurface_backscat_ampltd fullnamepath: /gt1r/qf_subsurface_backscat_ampltd coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_water_depth: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Water depth units: meters source: ATL13 ATBD, Section 5.3.4 (A) contentType: referenceInformation description: Depth from the mean water surface to detected bottom. origname: water_depth fullnamepath: /gt1r/water_depth coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_qf_bias_em: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: EM Bias Quality Flag units: 1 source: Inland Water ATBD valid_min: -3 valid_max: 4 contentType: qualityInformation description: The Electromagnetic Bias flag is set based on threshold checks for the estimated electromagnetic height bias. The flag is set as follows: -3 if H_bias_EM < -0.10 (m); -2 if -0.10 < H_bias_EM < -0.05; -1 if -0.05 <= H_bias_EM < -0.01; 0 if -0.01 <= H_bias_EM < 0.01 (m); 1 if 0.01 <= H_bias_EM < 0.05; 2 if 0.05 <= H_bias_EM < 0.10; 3 if 0.10 < H_bias_EM; 4 if H_bias_EM is invalid. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 above_threshold6 invalid flag_values: -3, -2, -1, 0, 1, 2, 3, 4 origname: qf_bias_em fullnamepath: /gt1r/qf_bias_em coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_id_end: | Array of 32 bit Integers [gt1r_delta_time = 0..50001] long_name: Last ATL03 Segment ID units: 1 source: ATL03 contentType: referenceInformation description: Last ATL03 segment_id associated with the photons within this inland water segment. origname: segment_id_end fullnamepath: /gt1r/segment_id_end coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_qf_stdev_vlseg: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: observed standard deviation quality flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Quality flag indicating the magnitude of standard deviation (SD) of observed detrended heights of the very long segment to which the short segment belongs, where 0: SD < 0.5 (meters), 1: 0.5 <= SD < 1.5, 2: 1.5 <= SD < 2.5, 3: 2.5 <= SD < 3.5, 4: 3.5 <= SD < 4.5, 5: 4.5 <= SD < 5.5, 6: 5.5 <= SD < 6.5, 7: 6.5 <= SD < 7.5, 8: 7.5 <= SD < 8.5, 9: 8.5 <= SD. It is recommended that a user consider this flag in conjunction with the water body type and size to best determine if the observed surface standard deviation is reasonable or whether results should be considered questionable. flag_meanings: SD_below_0.5 SD_below_1.5 SD_below_2.5 SD_below_3.5 SD_below_4.5 SD_below_5.5 SD_below_6.5 SD_below_7.5 SD_below_8.5 SD_greater_or_equal_to_8.5 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_stdev_vlseg fullnamepath: /gt1r/qf_stdev_vlseg coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_apparent_ht: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Apparent height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Apparent height of the short segment, before adjustments are made by the algorithm, based on an average of heights within a designated range of the short segment mode. origname: segment_apparent_ht fullnamepath: /gt1r/segment_apparent_ht coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_stdev_water_surf: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Surface StDev units: meters source: section 5.3.3 (C) contentType: referenceInformation description: Standard deviation of water surface, calculated over long segments with result reported at each short segment location tag contained within. origname: stdev_water_surf fullnamepath: /gt1r/stdev_water_surf coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_met_wind10_atl09: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Wind speed magnitude at 10m standard_name: Wind speed units: m/s source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Wind speed magnitude at 10m height from ATL09 input. origname: met_wind10_atl09 fullnamepath: /gt1r/met_wind10_atl09 coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_qf_iwp: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Inland Water Segment Processing Flag units: 1 source: Inland Water ATBD valid_min: 1 valid_max: 7 contentType: qualityInformation description: Describes the level of processing the inland water algorithm was able to perform based on the data available, ranging from one to 7. flag_meanings: 1_short_segment 2_short_segments 3_to_5_short_segments 6_to_7_short_segments 8_to_9_short_segments 10_to_29_short_segments at_least_30_short_segments flag_values: 1, 2, 3, 4, 5, 6, 7 origname: qf_iwp fullnamepath: /gt1r/qf_iwp coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_anom_ssegs_rgt: | Array of 16 bit Integers [gt1r_anom_ssegs_anom_sseg_time = 0..27992] long_name: Reference Ground track units: 1 source: ATL03 valid_min: 1 valid_max: 1387 contentType: referenceInformation 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 1,387 RGTs. origname: rgt fullnamepath: /gt1r/anom_ssegs/rgt coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lat gt1r_anom_ssegs_anom_sseg_lon |
| gt1r_anom_ssegs_anom_sseg_trigger_flag: | Array of 16 bit Integers [gt1r_anom_ssegs_anom_sseg_time = 0..27992][ds_anom_trigger = 0..8] _FillValue: 127 long_name: Anomalous classification flag units: 1 source: ATL13 ATBD, Table 5-4b valid_min: 0 valid_max: 1 contentType: qualityInformation description: Nine element array describing justification for short segment classification as anomalous, where for each element 0 = not triggered as anomalous and 1 = triggered as anomalous due to any of the following causes: [element 1=coarse ht difference, element 2=abnormal length, element 3= histogram mode spread, element 4=histogram mode count, element 5=histogram mode intensity, element 6=invalid long segment, element 7=shore buffer designation, element 8=insufficient signal phs, element 9=transect coarse water height unavailable against which to test short segment height] flag_meanings: not_triggered_as_anomalous triggered_as_anomalous flag_values: 0, 1 origname: anom_sseg_trigger_flag fullnamepath: /gt1r/anom_ssegs/anom_sseg_trigger_flag coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lat gt1r_anom_ssegs_anom_sseg_lon |
| gt1r_anom_ssegs_anom_sseg_quality: | Array of 32 bit Integers [gt1r_anom_ssegs_anom_sseg_time = 0..27992][ds_sseg_quality = 0..3] long_name: Segment quality group count units: 1 source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Four-element array of describing, for each anomalous short segment n, the count of photons qualifying in each quality group. (n,1) = nominal, (n,2) = possible afterpulse, (n,3) = possible impulse response effect, (n,4) = possible TEP _FillValue: 2147483647 origname: anom_sseg_quality fullnamepath: /gt1r/anom_ssegs/anom_sseg_quality coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lat gt1r_anom_ssegs_anom_sseg_lon |
| gt1r_anom_ssegs_transect_id: | Array of 16 bit Integers [gt1r_anom_ssegs_anom_sseg_time = 0..27992] _FillValue: 127 long_name: Transect ID units: 1 source: ATL13 ATBD, Section 5.3.2 (C) contentType: referenceInformation description: Transect within a water body to which the short segment rate output belongs. origname: transect_id fullnamepath: /gt1r/anom_ssegs/transect_id coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lat gt1r_anom_ssegs_anom_sseg_lon |
| gt1r_anom_ssegs_cycle_number: | Array of 16 bit Integers [gt1r_anom_ssegs_anom_sseg_time = 0..27992] long_name: Cycle Number units: counts source: ATL03 valid_min: 0 valid_max: 50 contentType: referenceInformation 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 1,387 and adding the RGT value. origname: cycle_number fullnamepath: /gt1r/anom_ssegs/cycle_number coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lat gt1r_anom_ssegs_anom_sseg_lon |
| gt1r_anom_ssegs_anom_sseg_lat: | Array of 64 bit Reals [gt1r_anom_ssegs_anom_sseg_time = 0..27992] long_name: Latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of the short segment (mean of signal class >=2 ph Lats). origname: anom_sseg_lat fullnamepath: /gt1r/anom_ssegs/anom_sseg_lat coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lon |
| gt1r_anom_ssegs_anom_sseg_stdev: | Array of 32 bit Reals [gt1r_anom_ssegs_anom_sseg_time = 0..27992] _FillValue: 3.402823466e+38 long_name: Segment standard deviation units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Standard deviation of anomalous short segment photon height in the anomalous short segment with signal classification >=2. origname: anom_sseg_stdev fullnamepath: /gt1r/anom_ssegs/anom_sseg_stdev coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lat gt1r_anom_ssegs_anom_sseg_lon |
| gt1r_anom_ssegs_anom_sseg_ht_delta: | Array of 32 bit Reals [gt1r_anom_ssegs_anom_sseg_time = 0..27992] _FillValue: 3.402823466e+38 long_name: Height difference units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Height difference between anom_sseg_mode of the anomalous short segment and the transect coarse_transect_ht. origname: anom_sseg_ht_delta fullnamepath: /gt1r/anom_ssegs/anom_sseg_ht_delta coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lat gt1r_anom_ssegs_anom_sseg_lon |
| gt1r_anom_ssegs_anom_sseg_length: | Array of 64 bit Reals [gt1r_anom_ssegs_anom_sseg_time = 0..27992] _FillValue: 1.7976931348623157e+308 long_name: Segment length units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Length of the short segment, based on end points computed by the average of sseg_endpoint_avg_n signal photons. origname: anom_sseg_length fullnamepath: /gt1r/anom_ssegs/anom_sseg_length coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lat gt1r_anom_ssegs_anom_sseg_lon |
| gt1r_anom_ssegs_anom_sseg_end_lon: | Array of 64 bit Reals [gt1r_anom_ssegs_anom_sseg_time = 0..27992] long_name: End longitude standard_name: longitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: End longitude of the anomalous short segment, based on the average longitude of the last sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_end_lon fullnamepath: /gt1r/anom_ssegs/anom_sseg_end_lon coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lat gt1r_anom_ssegs_anom_sseg_lon |
| gt1r_anom_ssegs_coarse_transect_ht: | Array of 32 bit Reals [gt1r_anom_ssegs_anom_sseg_time = 0..27992] _FillValue: 3.402823466e+38 long_name: Coarse water height units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Coarse water height of transect. origname: coarse_transect_ht fullnamepath: /gt1r/anom_ssegs/coarse_transect_ht coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lat gt1r_anom_ssegs_anom_sseg_lon |
| gt1r_anom_ssegs_anom_sseg_mode: | Array of 32 bit Reals [gt1r_anom_ssegs_anom_sseg_time = 0..27992] _FillValue: 3.402823466e+38 long_name: Anomalous mode bin height units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Height of anomalous short segment as determined by histogram bin mode. origname: anom_sseg_mode fullnamepath: /gt1r/anom_ssegs/anom_sseg_mode coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lat gt1r_anom_ssegs_anom_sseg_lon |
| gt1r_anom_ssegs_anom_sseg_lon: | Array of 64 bit Reals [gt1r_anom_ssegs_anom_sseg_time = 0..27992] long_name: Longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of the short segment (mean of signal class >=2 ph Lons). origname: anom_sseg_lon fullnamepath: /gt1r/anom_ssegs/anom_sseg_lon coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lat |
| gt1r_anom_ssegs_anom_sseg_start_lon: | Array of 64 bit Reals [gt1r_anom_ssegs_anom_sseg_time = 0..27992] long_name: Start longitude standard_name: longitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Start longitude of the anomalous short segment, based on the average longitude of the first sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_start_lon fullnamepath: /gt1r/anom_ssegs/anom_sseg_start_lon coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lat gt1r_anom_ssegs_anom_sseg_lon |
| gt1r_anom_ssegs_anom_sseg_mean_ht_ortho: | Array of 32 bit Reals [gt1r_anom_ssegs_anom_sseg_time = 0..27992] _FillValue: 3.402823466e+38 long_name: Orthometric Height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Orthometric height of anomalous short segment as determined by the mean of photon orthometric heights in the anomalous short segment with signal classification >2 origname: anom_sseg_mean_ht_ortho fullnamepath: /gt1r/anom_ssegs/anom_sseg_mean_ht_ortho coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lat gt1r_anom_ssegs_anom_sseg_lon |
| gt1r_anom_ssegs_anom_sseg_start_lat: | Array of 64 bit Reals [gt1r_anom_ssegs_anom_sseg_time = 0..27992] long_name: Start latitude standard_name: latitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Start latitude of the anomalous short segment, based on the average latitude of the first sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_start_lat fullnamepath: /gt1r/anom_ssegs/anom_sseg_start_lat coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lat gt1r_anom_ssegs_anom_sseg_lon |
| gt1r_anom_ssegs_anom_sseg_end_lat: | Array of 64 bit Reals [gt1r_anom_ssegs_anom_sseg_time = 0..27992] long_name: End latitude standard_name: latitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: End latitude of the anomalous short segment, based on the average latitude of the last sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_end_lat fullnamepath: /gt1r/anom_ssegs/anom_sseg_end_lat coordinates: gt1r_anom_ssegs_anom_sseg_time gt1r_anom_ssegs_anom_sseg_lat gt1r_anom_ssegs_anom_sseg_lon |
| gt1r_segment_podppd_flag: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 0 long_name: POD_PPD Flag units: 1 source: ATL02, ANC04, ANC05 valid_min: 0 valid_max: 7 contentType: referenceInformation description: Composite POD/PPD flag that indicates the quality of input geolocation products for the utilized ATL03 segments on an ATL13 short segment output basis. A non-zero value may indicate that geolocation solutions are degraded or that ATLAS is within a calibration scan period (CAL). The ATL03 sigma values should indicate the degree of uncertainty associated with the degradation. Possible non-CAL values are: 0=NOMINAL; 1=POD_DEGRADE; 2=PPD_DEGRADE; 3=PODPPD_DEGRADE; possible CAL values are: 4=CAL_NOMINAL; 5=CAL_POD_DEGRADE; 6=CAL_PPD_DEGRADE; 7=CAL_PODPPD_DEGRADE; flag_meanings: nominal pod_degrade ppd_degrade podppd_degrade cal_nominal cal_pod_degrade cal_ppd_degrade cal_podppd_degrade flag_values: 0, 1, 2, 3, 4, 5, 6, 7 origname: segment_podppd_flag fullnamepath: /gt1r/segment_podppd_flag coordinates: gt1r_delta_time |
| gt1r_qf_ht_adj: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Height adjustment Quality Flag units: 1 source: ATL13 ATBD, Section 5.3.5 (C) valid_min: -4 valid_max: 5 contentType: qualityInformation description: Flag representing the range of height, defined in 5.3.5 (C), which has been added to the apparent surface height due to frame of reference scaling during deconvolution analysis. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 below_threshold7 below_threshold8 equal_to_or_above_threshold8 invalid flag_values: -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 origname: qf_ht_adj fullnamepath: /gt1r/qf_ht_adj coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_full_sat_fract: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Full Saturation Fraction units: 1 source: ATL13 ATBD, Section 5.2 valid_min: 0.000000000 valid_max: 1.000000000 contentType: qualityInformation description: The fraction of pulses within the short segment determined to be fully saturated based on ATL03 geosegment rate input. origname: segment_full_sat_fract fullnamepath: /gt1r/segment_full_sat_fract coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_id_beg: | Array of 32 bit Integers [gt1r_delta_time = 0..50001] long_name: First ATL03 Segment ID units: 1 source: ATL03 contentType: referenceInformation description: First ATL03 segment_id associated with the photons within this inland water segment. origname: segment_id_beg fullnamepath: /gt1r/segment_id_beg coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_qf_subsurf_anomaly: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] units: 1 source: Inland Water ATBD 5.3.4(A) valid_min: 1 valid_max: 3 contentType: qualityInformation description: Describes the likelihood that the bottom or other subsurface anomaly is bottom based on the threshold value at which an anomaly was found. 1 = Subsurface anomaly due to bottom likely; 2 = Subsurface signal may indicate bottom or other anomaly; 3 = Possible subsurface anomaly; invalid = No subsurface anomaly detected flag_meanings: bottom_likely bottom_or_other_anomaly possible_subsurface_anomaly flag_values: 1, 2, 3 _FillValue: 127 long_name: Subsurface Anomaly Quality Flag origname: qf_subsurf_anomaly fullnamepath: /gt1r/qf_subsurf_anomaly coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_subsurface_attenuation: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Subsurface Attenuation units: m^-1 source: Section 5.3.4 (A) contentType: physicalMeasurement description: Subsurface attenuation coefficient. origname: subsurface_attenuation fullnamepath: /gt1r/subsurface_attenuation coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_layer_flag_atl09: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Consolidated cloud flag units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 1 contentType: qualityInformation description: Consolidated cloud flag. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 origname: layer_flag_atl09 fullnamepath: /gt1r/layer_flag_atl09 coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_inland_water_body_region: | Array of 32 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 2147483647 long_name: Body region units: 1 source: ATL13 ATBD, Section 5.3.1 (A) contentType: referenceInformation description: ATL13-created shapefile representing relevant bodies of water over which to implement the ATL13 water surface finding algorithm only within a region of processing interest. origname: inland_water_body_region fullnamepath: /gt1r/inland_water_body_region coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_sseg_end_lat: | Array of 64 bit Reals [gt1r_delta_time = 0..50001] long_name: End latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Latitude at which the short segment ends. May be a signal or non-signal photon. origname: sseg_end_lat fullnamepath: /gt1r/sseg_end_lat coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_cloud_flag_asr_atl09: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Cloud Flag ASR units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 5 contentType: modelResult description: Cloud probability from ASR. flag_meanings: clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence flag_values: 0, 1, 2, 3, 4, 5 origname: cloud_flag_asr_atl09 fullnamepath: /gt1r/cloud_flag_asr_atl09 coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_ice_flag: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Ice Flag units: 1 source: ATL13 ATBD, section 5.2 valid_min: 0 valid_max: 1 contentType: qualityInformation description: Describes likelihood of ice on water surface short segment. flag_meanings: no_ice ice flag_values: 0, 1 origname: ice_flag fullnamepath: /gt1r/ice_flag coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_sseg_start_lat: | Array of 64 bit Reals [gt1r_delta_time = 0..50001] long_name: Start latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude at which the short segment begins. May be a signal or non-signal photon. origname: sseg_start_lat fullnamepath: /gt1r/sseg_start_lat coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_ref_elev: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: elevation standard_name: elevation units: radians source: ATL13 ATBD, Section 5.3.5 (A) contentType: auxiliaryInformation 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. origname: segment_ref_elev fullnamepath: /gt1r/segment_ref_elev coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_lon: | Array of 64 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 1.7976931348623157e+308 long_name: Longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of reporting location for all short segment statistics. origname: segment_lon fullnamepath: /gt1r/segment_lon coordinates: gt1r_delta_time gt1r_segment_lat |
| gt1r_ht_ortho: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Orthometric Height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Orthometric height EGM2008 converted from ellipsoidal height. origname: ht_ortho fullnamepath: /gt1r/ht_ortho coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_lat: | Array of 64 bit Reals [gt1r_delta_time = 0..50001] long_name: Latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of reporting location for all short segment statistics. origname: segment_lat fullnamepath: /gt1r/segment_lat coordinates: gt1r_delta_time gt1r_segment_lon |
| gt1r_ht_water_surf: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Water surface height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Water surface height, reported for each short segment (default length = approximately 100 signal photons) with reference to WGS84 ellipsoid origname: ht_water_surf fullnamepath: /gt1r/ht_water_surf coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_near_sat_fract: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Near Saturation Fraction units: 1 source: ATL13 ATBD, Section 5.2 valid_min: 0.000000000 valid_max: 1.000000000 contentType: qualityInformation description: The fraction of pulses within the short segment determined to be nearly saturated based on ATL03 geosegment rate input. origname: segment_near_sat_fract fullnamepath: /gt1r/segment_near_sat_fract coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_err_ht_water_surf: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Height Error units: 1 source: section 5.3.3 (C) contentType: qualityInformation description: Error included in heights reported in ht_water_surf. origname: err_ht_water_surf fullnamepath: /gt1r/err_ht_water_surf coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_bottom_lon: | Array of 64 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 1.7976931348623157e+308 long_name: Mean longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of actual bottom location, based on the apparent bottom sseg_mean_lat / sseg_mean_lon location corrected for refraction effects. origname: bottom_lon fullnamepath: /gt1r/bottom_lon coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_bias_fit: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Goodness of fit bias units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Bias contribution from goodness of observation/system response fit. (Has been applied to ht_ortho and _ht_water_surf products) origname: segment_bias_fit fullnamepath: /gt1r/segment_bias_fit coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_qf_cloud: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Consolidated cloud flag units: 1 source: ATL09 valid_min: 0 valid_max: 1 contentType: qualityInformation description: This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow. From the ATL09 data closest to the segment time. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 origname: qf_cloud fullnamepath: /gt1r/qf_cloud coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_inland_water_body_source: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Body source units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 1 valid_max: 9 contentType: referenceInformation description: Source of Inland Water Body shape, where 1=HydroLAKES, 2=Global Lakes and Wetlands Database, 3=Named Marine Water Bodies, 4=GSHHG Shoreline, 5=Global River Widths from Landsat, 6=Reserved, 7=Reserved, 8=Reserved, 9=Reserved flag_meanings: HydroLAKES Global_Lakes_and_Wetlands_Database Named_Marine_Water_Bodies GSHHG_Shoreline Global_River_Widths_from_Landsat Reserved Reserved Reserved Reserved flag_values: 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_source fullnamepath: /gt1r/inland_water_body_source coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_tide_earth_free2mean: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Earth Tide Free-to-Mean conversion units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Segment rate value to convert solid earth tide from the tide-free system that was applied in ATL03 to photon heights to the ht_water_surf to the mean-tide system. Subtract value from ht_water_surf to reference it in the mean-tide system. Applicable value at reporting location for all short segment statistics. origname: segment_tide_earth_free2mean fullnamepath: /gt1r/segment_tide_earth_free2mean coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_qf_stdev_lseg: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: observed standard deviation quality flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Quality flag indicating the magnitude of standard deviation (SD) of observed detrended heights of the long segment to which the short segment belongs, where 0: SD < 0.5 (meters), 1: 0.5 <= SD < 1.5, 2: 1.5 <= SD < 2.5, 3: 2.5 <= SD < 3.5, 4: 3.5 <= SD < 4.5, 5: 4.5 <= SD < 5.5, 6: 5.5 <= SD < 6.5, 7: 6.5 <= SD < 7.5, 8: 7.5 <= SD < 8.5, 9: 8.5 <= SD. It is recommended that a user consider this flag in conjunction with the water body type and size to best determine if the observed surface standard deviation is reasonable or whether results should be considered questionable. flag_meanings: SD_below_0.5 SD_below_1.5 SD_below_2.5 SD_below_3.5 SD_below_4.5 SD_below_5.5 SD_below_6.5 SD_below_7.5 SD_below_8.5 SD_greater_or_equal_to_8.5 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_stdev_lseg fullnamepath: /gt1r/qf_stdev_lseg coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_dem_source: | Array of 32 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 2147483647 long_name: dem source flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 4 contentType: referenceInformation description: Flag equal to the source of the selected photon (in hierarchy of Arctic/Global/MSS/Antarctic). Values: 0=None, 1=Arctic, 2=Global, 3=MSS, 4=Antarctic. flag_meanings: none arctic global mss antarctic flag_values: 0, 1, 2, 3, 4 origname: segment_dem_source fullnamepath: /gt1r/segment_dem_source coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_fpb_correction: | Array of 64 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 1.7976931348623157e+308 long_name: First photon bias correction units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: First photon bias correction. May be applied at user disrection by subtracting from mean height produts ht_ortho and ht_water_surf. origname: segment_fpb_correction fullnamepath: /gt1r/segment_fpb_correction coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_inland_water_body_size: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Body size units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 0 valid_max: 9 contentType: referenceInformation description: Size of Inland Water Body, A=area, where 0=Not_Assigned, 1=A>10,000 sq km, 2=10,000>A>=1,000, 3=1,000>A>=100, 4=100>A>=10, 5=10>A>=1, 6=1>A>=0.1, 7=0.01>A, 8=Reserved, 9=Reserved flag_meanings: not_assigned area_gt_10000 10000_gt_area_ge_1000 1000_gt_area_ge_100 100_gt_area_ge_10 10_gt_area_ge_1 1_gt_area_ge_0.1 0.01_gt_area Reserved Reserved flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_size fullnamepath: /gt1r/inland_water_body_size coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_met_wind10_atl13: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Wind speed magnitude at 10m standard_name: Wind speed units: m/s source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Wind speed magnitude at 10m height, based on derived water surface wave height. origname: met_wind10_atl13 fullnamepath: /gt1r/met_wind10_atl13 coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_snow_ice_atl09: | Array of 32 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 2147483647 long_name: Snow Ice Flag units: 1 source: ATL13 ATBD, Section 5.3.5 (A) contentType: modelResult description: NOAA snow/ice flag scaled by ATL09 (0=ice-free water, 1=snow-free land, 2=snow, 3=ice, 127=invalid) flag_meanings: ice_free_water snow_free_land snow ice invalid flag_values: 0, 1, 2, 3, 127 origname: snow_ice_atl09 fullnamepath: /gt1r/snow_ice_atl09 coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_tide_ocean: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Segment Tide Ocean units: meters source: ATL03 contentType: auxiliaryInformation description: Ocean tides including diurnal and semi-diurnal (harmonic analysis (+-4 m)). Although available at short segment rate for all water body types, value is provide mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_tide_ocean fullnamepath: /gt1r/segment_tide_ocean coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_err_slope_trk: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] units: 1 _FillValue: 3.402823466e+38 long_name: Slope Error source: section 5.3.3 (C) contentType: qualityInformation description: Error included in segment_slope_trk_local. origname: err_slope_trk fullnamepath: /gt1r/err_slope_trk coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_slope_trk_bdy: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Water Body Slope units: m/m source: ATL13 ATBD, Section 5.3.5 (A) contentType: physicalMeasurement description: Along track water body surface slope, reported per short segment ID per water body. origname: segment_slope_trk_bdy fullnamepath: /gt1r/segment_slope_trk_bdy coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_sseg_mean_lat: | Array of 64 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 1.7976931348623157e+308 long_name: Mean latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Mean latitude of the signal-qualified photons in a short segment. origname: sseg_mean_lat fullnamepath: /gt1r/sseg_mean_lat coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_geoid_free2mean: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Geoid Free-to-Mean conversion units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Value to convert segment geoid heights from the mean-tide system to the tide-free system. Subtract this value from mean-tide system segment_geoid (on ATL13) to get geoid heights in the tide-free system. Applicable value at reporting location for all short segment statistics. origname: segment_geoid_free2mean fullnamepath: /gt1r/segment_geoid_free2mean coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_qf_spec_width: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Spectral width Flag units: 1 source: ATL13 ATBD, Section 4.8.8 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Spectral moments width flag. The flag is set as follows: 0 when spec_width is invalid; 1 when 0 <= spec_width <= 0.2; 2 when 0.2 < spec_width <= 0.3; 3 when 0.3 < spec_width <= 0.4; 4 when 0.4 < spec_width <= 0.5; 5 when 0.5 < spec_width <= 0.6; 6 when 0.6 < spec_width <= 0.7; 7 when 0.7 < spec_width <= 0.8; 8 when 0.8 < spec_width <= 0.9; 9 when 0.9 < spec_width. flag_meanings: invalid 0<=spec_width<=0.2 0.2 origname: qf_spec_width fullnamepath: /gt1r/qf_spec_width coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_qf_bckgrd: | Array of 16 bit Integers [gt1r_delta_time = 0..50001] _FillValue: 127 long_name: Background Quality Flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 6 contentType: qualityInformation description: Describes the degree of background photons present in each short segment. bckgrd_dnsty_threshold1= 0.001 (counts per bi per Lseg); bckgrd_dnsty_threshold2= 0.01 (counts per bin per Lseg); bckgrd_dnsty_threshold3= 0.05 (counts per bin per Lseg); bckgrd_dnsty_threshold4= 0.1 (counts per bin per Lseg); bckgrd_dnsty_threshold5= 0.3 (counts per bin per Lseg); bckgrd_dnsty_threshold6= 0.5 (counts per bin per Lseg) flag_meanings: equal_to_or_below_threshold1 equal_to_or_below_threshold2 equal_to_or_below_threshold3 equal_to_or_below_threshold4 equal_to_or_below_threshold5 equal_to_or_below_threshold6 above_threshold6 flag_values: 0, 1, 2, 3, 4, 5, 6 origname: qf_bckgrd fullnamepath: /gt1r/qf_bckgrd coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_sseg_mean_time: | Array of 64 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 1.7976931348623157e+308 long_name: Mean time standard_name: time units: Seconds since 2018-01-01 source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Mean time of the signal-qualified photons in a short segment. origname: sseg_mean_time fullnamepath: /gt1r/sseg_mean_time coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_met_ts_atl09: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Surface temperature standard_name: temperature units: K source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Surface (skin) temperature from ATL09. origname: met_ts_atl09 fullnamepath: /gt1r/met_ts_atl09 coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_bias_em: | Array of 64 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 1.7976931348623157e+308 long_name: Electromagnetic bias units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Electromagnetic bias. (Has been applied to ht_ortho and _ht_water_surf products) origname: segment_bias_em fullnamepath: /gt1r/segment_bias_em coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_dem_ht: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: DEM Height units: meters source: ATL13 ATBD, Section 5.3.5 contentType: referenceInformation description: DEM height relative to WGS-84 ellipsoid, reported at the short segment rate. origname: segment_dem_ht fullnamepath: /gt1r/segment_dem_ht coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_subsurface_backscat_ampltd: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Subsurface backscatter amplitude units: 1 source: Section 5.3.4 (A) contentType: modelResult description: Subsurface backscatter amplitude, described in section 4.5.3, reported per long segment (default length = 10 short segments = approximately 1000 signal photons). origname: subsurface_backscat_ampltd fullnamepath: /gt1r/subsurface_backscat_ampltd coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt1r_segment_dac: | Array of 32 bit Reals [gt1r_delta_time = 0..50001] _FillValue: 3.402823466e+38 long_name: Segment DAC units: meters source: ATBD Section 5.3.5A contentType: auxiliaryInformation description: Dynamic atmospheric correction (DAC) includes inverted barometer (IB) effect (+- 5 cm). Although available at short segment rate for all water body types, value is provided mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_dac fullnamepath: /gt1r/segment_dac coordinates: gt1r_delta_time gt1r_segment_lat gt1r_segment_lon |
| gt2r_rgt: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] long_name: Reference Ground track units: 1 source: ATL03 valid_min: 1 valid_max: 1387 contentType: referenceInformation 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 1,387 RGTs. origname: rgt fullnamepath: /gt2r/rgt coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_azimuth: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Azimuth standard_name: azimuth units: radians source: ATL13 ATBD, Section 5.3.5 (A) contentType: auxiliaryInformation description: The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees. origname: segment_azimuth fullnamepath: /gt2r/segment_azimuth coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_qf_bias_fit: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Height Bias Fit Quality Flag units: 1 source: Inland Water ATBD valid_min: -3 valid_max: 4 contentType: qualityInformation description: The height bias fit flag is set based on the value of the goodness of fit bias estimated as the difference between the centroid elevations of the observed surface water histogram and fitted integrated water surface model histogram. The flag values are set as follows: = -3 if H_bias_fit < -0.10 (m); -2 if -0.10 <= H_bias_fit < -0.05;-1 when -0.05 <= H_bias_fit < -0.01; 0 if -0.01 <= H_bias_fit < 0.01 (m); 1 if 0.01 <= H_bias_fit < 0.05; 2 if 0.05 < H_bias_fit < 0.10; 3 if 0.10 <= H_bias_fit; 4 if H_bias_fit is invalid. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 equal_to_or_above_threshold6 invalid flag_values: -3, -2, -1, 0, 1, 2, 3, 4 origname: qf_bias_fit fullnamepath: /gt2r/qf_bias_fit coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_sseg_mean_lon: | Array of 64 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 1.7976931348623157e+308 long_name: Mean longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Mean longitude of the signal-qualified photons in a short segment. origname: sseg_mean_lon fullnamepath: /gt2r/sseg_mean_lon coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_cloud_flag_atm_atl09: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Cloud Flag Atm units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 10 contentType: modelResult description: Cloud flag from backscatter profile. origname: cloud_flag_atm_atl09 fullnamepath: /gt2r/cloud_flag_atm_atl09 coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_qf_ice: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Ice Quality Flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 3 contentType: qualityInformation description: The quality flag for ice describes the likelihood of ice on the short water body surface segment. 0 for QF_Bckgrd<= 2; 1 for 2 < QF_Bckgrd<= 4; 2 for 4 < QF_Bckgrd; 3 for (4 < QF_Bckgrd and QF_Cloud=1) flag_meanings: qf_bckgrd_le_2 qf_bckgrd_le_4 qf_bckgrd_gt_4 qf_bckgrd_w_cloud flag_values: 0, 1, 2, 3 origname: qf_ice fullnamepath: /gt2r/qf_ice coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_transect_id: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Transect ID units: 1 source: ATL13 ATBD, Section 5.3.2 (C) contentType: referenceInformation description: Transect within a water body to which the short segment rate output belongs. origname: transect_id fullnamepath: /gt2r/transect_id coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_inland_water_body_type: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Body type units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 1 valid_max: 9 contentType: referenceInformation description: Type of Inland Water Body, where 1=Lake, 2=Known Reservoir, 3=(Reserved for future use), 4=Ephemeral Water, 5=River, 6=Estuary or Bay, 7=Coastal Water, 8=Reserved, 9=Reserved flag_meanings: Lake Known_Reservoir Reserved_for_future_use Ephemeral_Water River Estuary_or_Bay Coastal_Water Reserved Reserved flag_values: 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_type fullnamepath: /gt2r/inland_water_body_type coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_inland_water_body_id: | Array of 32 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 2147483647 long_name: Body ID units: 1 source: ATL13 ATBD, Section 5.3.1 (C) contentType: referenceInformation description: Identifying signature of an individual inland water body. Each body of water is represented by a unique numeric value. origname: inland_water_body_id fullnamepath: /gt2r/inland_water_body_id coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_sseg_end_lon: | Array of 64 bit Reals [gt2r_delta_time = 0..60233] long_name: End longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude at which the short segment ends. May be a signal or non-signal photon. origname: sseg_end_lon fullnamepath: /gt2r/sseg_end_lon coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_qf_subsurface_attenuation: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Subsurface attenuation quality flag units: 1 source: ATL13 ATBD, Section 5.3.4 (A) valid_min: -2 valid_max: 2 contentType: qualityInformation description: Quality flag indicating whether or not the reported subsurface attenuation was constrained during deconvolution by the minimum (initial) limit in the possible range (QF=-1), the maximum limit in the possible range (QF = 1), or was allowed to settle on a solution within the possible range (QF=0). For analysis prior to deconvolution of the subsurface attenuation fit to the observations, the flag indicates whether the value determined by attempting to fit the observations was below (QF= -2), above (QF= 2), or within (QF=0) the possible range of expected values. When the default value for subsurface attenuation is chosen due to any condition other than those defined by an existing quality flag, QF=invalid. flag_meanings: obs_fit_below_range initial_limit within_range maximum_limit obs_fit_above_range flag_values: -2, -1, 0, 1, 2 origname: qf_subsurface_attenuation fullnamepath: /gt2r/qf_subsurface_attenuation coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_quality: | Array of 32 bit Integers [gt2r_delta_time = 0..60233][ds_sseg_quality = 0..3] _FillValue: 2147483647 long_name: Segment quality group count units: 1 source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Four-element array of describing, for each short segment n, the count of photons qualifying in each quality group. (n,1) = nominal, (n,2) = possible afterpulse, (n,3) = possible impulse response effect, (n,4) = possible TEP origname: segment_quality fullnamepath: /gt2r/segment_quality coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_geoid: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Segment Geoid units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Applicable mean-tide system geoid value at reporting location for all short segment statistics. (see geoid_free2mean to convert to the tide-free system.) origname: segment_geoid fullnamepath: /gt2r/segment_geoid coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_qf_sseg_length: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Short Segment Length flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 9 contentType: qualityInformation description: Length of short segments flag. The flag is set as follows: 0 if sseg_length < 10 (meters); 1 if 10 <= sseg_length < 20 (meters); 2 if 20 <= sseg_length < 30 (meters); 3 if 30 <= sseg_length < 50 (meters); 4 if 50 <= sseg_length < 75 (meters); 5 if 75 <= sseg_length < 100 (meters); 6 if 100 <= sseg_length < 150 (meters); 7 if 150 <= sseg_length < 200 (meters); 8 if 200 <= sseg_length < 300 (meters); 9 if 300 <= sseg_length. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 below_threshold7 below_threshold8 below_threshold9 equal_to_or_above_threshold9 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_sseg_length fullnamepath: /gt2r/qf_sseg_length coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_sseg_start_lon: | Array of 64 bit Reals [gt2r_delta_time = 0..60233] long_name: Start longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude at which the short segment begins. May be a signal or non-signal photon. origname: sseg_start_lon fullnamepath: /gt2r/sseg_start_lon coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_tide_equilibrium: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Segment Tide Equilibrium units: meters source: ATL03 contentType: auxiliaryInformation description: Long period equilibrium tide self-consistent with ocean tide model (+- 0.04 m). Although available at short segment rate for all water body types, value is provide mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_tide_equilibrium fullnamepath: /gt2r/segment_tide_equilibrium coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_qf_lseg_length: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Long Segment Length flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 3 contentType: qualityInformation description: The Long Segment Length flag is set based on the length of the long segment. The flag is set as follows: 0 if Lseg_length < 500 (meters); 1 if 50 <= Lseg_length < 1500 (meters); 2 if 150 <= Lseg_length < 3000 (meters); 3 if 3000 <= Lseg_length flag_meanings: below_threshold1 below_threshold2 below_threshold3 above_threshold4 flag_values: 0, 1, 2, 3 origname: qf_lseg_length fullnamepath: /gt2r/qf_lseg_length coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_significant_wave_ht: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: SWH units: meters source: section 5.3.3 (C) contentType: physicalMeasurement description: Significant wave height origname: significant_wave_ht fullnamepath: /gt2r/significant_wave_ht coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_bottom_lat: | Array of 64 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 1.7976931348623157e+308 long_name: Bottom latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of actual bottom location, based on the apparent bottom sseg_mean_lat / sseg_mean_lon location corrected for refraction effects. origname: bottom_lat fullnamepath: /gt2r/bottom_lat coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_cycle_number: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] long_name: Cycle Number units: counts source: ATL03 valid_min: 0 valid_max: 50 contentType: referenceInformation 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 1,387 and adding the RGT value. origname: cycle_number fullnamepath: /gt2r/cycle_number coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_qf_subsurface_backscat_ampltd: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Subsurface backscatter amplitude quality flag units: 1 source: ATL13 ATBD, Section 5.3.4 (A) valid_min: -2 valid_max: 2 contentType: qualityInformation description: Quality flag indicating whether or not the reported subsurface backscatter amplitude was constrained during deconvolution by the minimum limit in the possible range (QF=-1), the maximum limit in the possible range (QF = 1), or was allowed to settle on a solution within the possible range (QF=0). For analysis prior to deconvolution of the backscatter amplitude fit to the observations, the flag indicates whether the value determined by attempting to fit the observations was below (QF= -2), above (QF= 2), or within (QF=0) the possible range of expected values. When the default value for backscatter amplitude is chosen due to any condition other than those defined by an existing quality flag, QF=invalid. flag_meanings: obs_fit_below_range initial_limit within_range maximum_limit obs_fit_above_range flag_values: -2, -1, 0, 1, 2 origname: qf_subsurface_backscat_ampltd fullnamepath: /gt2r/qf_subsurface_backscat_ampltd coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_water_depth: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Water depth units: meters source: ATL13 ATBD, Section 5.3.4 (A) contentType: referenceInformation description: Depth from the mean water surface to detected bottom. origname: water_depth fullnamepath: /gt2r/water_depth coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_qf_bias_em: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: EM Bias Quality Flag units: 1 source: Inland Water ATBD valid_min: -3 valid_max: 4 contentType: qualityInformation description: The Electromagnetic Bias flag is set based on threshold checks for the estimated electromagnetic height bias. The flag is set as follows: -3 if H_bias_EM < -0.10 (m); -2 if -0.10 < H_bias_EM < -0.05; -1 if -0.05 <= H_bias_EM < -0.01; 0 if -0.01 <= H_bias_EM < 0.01 (m); 1 if 0.01 <= H_bias_EM < 0.05; 2 if 0.05 <= H_bias_EM < 0.10; 3 if 0.10 < H_bias_EM; 4 if H_bias_EM is invalid. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 above_threshold6 invalid flag_values: -3, -2, -1, 0, 1, 2, 3, 4 origname: qf_bias_em fullnamepath: /gt2r/qf_bias_em coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_id_end: | Array of 32 bit Integers [gt2r_delta_time = 0..60233] long_name: Last ATL03 Segment ID units: 1 source: ATL03 contentType: referenceInformation description: Last ATL03 segment_id associated with the photons within this inland water segment. origname: segment_id_end fullnamepath: /gt2r/segment_id_end coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_qf_stdev_vlseg: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: observed standard deviation quality flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Quality flag indicating the magnitude of standard deviation (SD) of observed detrended heights of the very long segment to which the short segment belongs, where 0: SD < 0.5 (meters), 1: 0.5 <= SD < 1.5, 2: 1.5 <= SD < 2.5, 3: 2.5 <= SD < 3.5, 4: 3.5 <= SD < 4.5, 5: 4.5 <= SD < 5.5, 6: 5.5 <= SD < 6.5, 7: 6.5 <= SD < 7.5, 8: 7.5 <= SD < 8.5, 9: 8.5 <= SD. It is recommended that a user consider this flag in conjunction with the water body type and size to best determine if the observed surface standard deviation is reasonable or whether results should be considered questionable. flag_meanings: SD_below_0.5 SD_below_1.5 SD_below_2.5 SD_below_3.5 SD_below_4.5 SD_below_5.5 SD_below_6.5 SD_below_7.5 SD_below_8.5 SD_greater_or_equal_to_8.5 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_stdev_vlseg fullnamepath: /gt2r/qf_stdev_vlseg coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_apparent_ht: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Apparent height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Apparent height of the short segment, before adjustments are made by the algorithm, based on an average of heights within a designated range of the short segment mode. origname: segment_apparent_ht fullnamepath: /gt2r/segment_apparent_ht coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_stdev_water_surf: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Surface StDev units: meters source: section 5.3.3 (C) contentType: referenceInformation description: Standard deviation of water surface, calculated over long segments with result reported at each short segment location tag contained within. origname: stdev_water_surf fullnamepath: /gt2r/stdev_water_surf coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_met_wind10_atl09: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Wind speed magnitude at 10m standard_name: Wind speed units: m/s source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Wind speed magnitude at 10m height from ATL09 input. origname: met_wind10_atl09 fullnamepath: /gt2r/met_wind10_atl09 coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_qf_iwp: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Inland Water Segment Processing Flag units: 1 source: Inland Water ATBD valid_min: 1 valid_max: 7 contentType: qualityInformation description: Describes the level of processing the inland water algorithm was able to perform based on the data available, ranging from one to 7. flag_meanings: 1_short_segment 2_short_segments 3_to_5_short_segments 6_to_7_short_segments 8_to_9_short_segments 10_to_29_short_segments at_least_30_short_segments flag_values: 1, 2, 3, 4, 5, 6, 7 origname: qf_iwp fullnamepath: /gt2r/qf_iwp coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_anom_ssegs_rgt: | Array of 16 bit Integers [gt2r_anom_ssegs_anom_sseg_time = 0..36865] long_name: Reference Ground track units: 1 source: ATL03 valid_min: 1 valid_max: 1387 contentType: referenceInformation 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 1,387 RGTs. origname: rgt fullnamepath: /gt2r/anom_ssegs/rgt coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lat gt2r_anom_ssegs_anom_sseg_lon |
| gt2r_anom_ssegs_anom_sseg_trigger_flag: | Array of 16 bit Integers [gt2r_anom_ssegs_anom_sseg_time = 0..36865][ds_anom_trigger = 0..8] _FillValue: 127 long_name: Anomalous classification flag units: 1 source: ATL13 ATBD, Table 5-4b valid_min: 0 valid_max: 1 contentType: qualityInformation description: Nine element array describing justification for short segment classification as anomalous, where for each element 0 = not triggered as anomalous and 1 = triggered as anomalous due to any of the following causes: [element 1=coarse ht difference, element 2=abnormal length, element 3= histogram mode spread, element 4=histogram mode count, element 5=histogram mode intensity, element 6=invalid long segment, element 7=shore buffer designation, element 8=insufficient signal phs, element 9=transect coarse water height unavailable against which to test short segment height] flag_meanings: not_triggered_as_anomalous triggered_as_anomalous flag_values: 0, 1 origname: anom_sseg_trigger_flag fullnamepath: /gt2r/anom_ssegs/anom_sseg_trigger_flag coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lat gt2r_anom_ssegs_anom_sseg_lon |
| gt2r_anom_ssegs_anom_sseg_quality: | Array of 32 bit Integers [gt2r_anom_ssegs_anom_sseg_time = 0..36865][ds_sseg_quality = 0..3] long_name: Segment quality group count units: 1 source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Four-element array of describing, for each anomalous short segment n, the count of photons qualifying in each quality group. (n,1) = nominal, (n,2) = possible afterpulse, (n,3) = possible impulse response effect, (n,4) = possible TEP _FillValue: 2147483647 origname: anom_sseg_quality fullnamepath: /gt2r/anom_ssegs/anom_sseg_quality coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lat gt2r_anom_ssegs_anom_sseg_lon |
| gt2r_anom_ssegs_transect_id: | Array of 16 bit Integers [gt2r_anom_ssegs_anom_sseg_time = 0..36865] _FillValue: 127 long_name: Transect ID units: 1 source: ATL13 ATBD, Section 5.3.2 (C) contentType: referenceInformation description: Transect within a water body to which the short segment rate output belongs. origname: transect_id fullnamepath: /gt2r/anom_ssegs/transect_id coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lat gt2r_anom_ssegs_anom_sseg_lon |
| gt2r_anom_ssegs_cycle_number: | Array of 16 bit Integers [gt2r_anom_ssegs_anom_sseg_time = 0..36865] long_name: Cycle Number units: counts source: ATL03 valid_min: 0 valid_max: 50 contentType: referenceInformation 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 1,387 and adding the RGT value. origname: cycle_number fullnamepath: /gt2r/anom_ssegs/cycle_number coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lat gt2r_anom_ssegs_anom_sseg_lon |
| gt2r_anom_ssegs_anom_sseg_lat: | Array of 64 bit Reals [gt2r_anom_ssegs_anom_sseg_time = 0..36865] long_name: Latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of the short segment (mean of signal class >=2 ph Lats). origname: anom_sseg_lat fullnamepath: /gt2r/anom_ssegs/anom_sseg_lat coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lon |
| gt2r_anom_ssegs_anom_sseg_stdev: | Array of 32 bit Reals [gt2r_anom_ssegs_anom_sseg_time = 0..36865] _FillValue: 3.402823466e+38 long_name: Segment standard deviation units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Standard deviation of anomalous short segment photon height in the anomalous short segment with signal classification >=2. origname: anom_sseg_stdev fullnamepath: /gt2r/anom_ssegs/anom_sseg_stdev coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lat gt2r_anom_ssegs_anom_sseg_lon |
| gt2r_anom_ssegs_anom_sseg_ht_delta: | Array of 32 bit Reals [gt2r_anom_ssegs_anom_sseg_time = 0..36865] _FillValue: 3.402823466e+38 long_name: Height difference units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Height difference between anom_sseg_mode of the anomalous short segment and the transect coarse_transect_ht. origname: anom_sseg_ht_delta fullnamepath: /gt2r/anom_ssegs/anom_sseg_ht_delta coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lat gt2r_anom_ssegs_anom_sseg_lon |
| gt2r_anom_ssegs_anom_sseg_length: | Array of 64 bit Reals [gt2r_anom_ssegs_anom_sseg_time = 0..36865] _FillValue: 1.7976931348623157e+308 long_name: Segment length units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Length of the short segment, based on end points computed by the average of sseg_endpoint_avg_n signal photons. origname: anom_sseg_length fullnamepath: /gt2r/anom_ssegs/anom_sseg_length coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lat gt2r_anom_ssegs_anom_sseg_lon |
| gt2r_anom_ssegs_anom_sseg_end_lon: | Array of 64 bit Reals [gt2r_anom_ssegs_anom_sseg_time = 0..36865] long_name: End longitude standard_name: longitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: End longitude of the anomalous short segment, based on the average longitude of the last sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_end_lon fullnamepath: /gt2r/anom_ssegs/anom_sseg_end_lon coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lat gt2r_anom_ssegs_anom_sseg_lon |
| gt2r_anom_ssegs_coarse_transect_ht: | Array of 32 bit Reals [gt2r_anom_ssegs_anom_sseg_time = 0..36865] _FillValue: 3.402823466e+38 long_name: Coarse water height units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Coarse water height of transect. origname: coarse_transect_ht fullnamepath: /gt2r/anom_ssegs/coarse_transect_ht coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lat gt2r_anom_ssegs_anom_sseg_lon |
| gt2r_anom_ssegs_anom_sseg_mode: | Array of 32 bit Reals [gt2r_anom_ssegs_anom_sseg_time = 0..36865] _FillValue: 3.402823466e+38 long_name: Anomalous mode bin height units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Height of anomalous short segment as determined by histogram bin mode. origname: anom_sseg_mode fullnamepath: /gt2r/anom_ssegs/anom_sseg_mode coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lat gt2r_anom_ssegs_anom_sseg_lon |
| gt2r_anom_ssegs_anom_sseg_lon: | Array of 64 bit Reals [gt2r_anom_ssegs_anom_sseg_time = 0..36865] long_name: Longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of the short segment (mean of signal class >=2 ph Lons). origname: anom_sseg_lon fullnamepath: /gt2r/anom_ssegs/anom_sseg_lon coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lat |
| gt2r_anom_ssegs_anom_sseg_start_lon: | Array of 64 bit Reals [gt2r_anom_ssegs_anom_sseg_time = 0..36865] long_name: Start longitude standard_name: longitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Start longitude of the anomalous short segment, based on the average longitude of the first sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_start_lon fullnamepath: /gt2r/anom_ssegs/anom_sseg_start_lon coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lat gt2r_anom_ssegs_anom_sseg_lon |
| gt2r_anom_ssegs_anom_sseg_mean_ht_ortho: | Array of 32 bit Reals [gt2r_anom_ssegs_anom_sseg_time = 0..36865] _FillValue: 3.402823466e+38 long_name: Orthometric Height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Orthometric height of anomalous short segment as determined by the mean of photon orthometric heights in the anomalous short segment with signal classification >2 origname: anom_sseg_mean_ht_ortho fullnamepath: /gt2r/anom_ssegs/anom_sseg_mean_ht_ortho coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lat gt2r_anom_ssegs_anom_sseg_lon |
| gt2r_anom_ssegs_anom_sseg_start_lat: | Array of 64 bit Reals [gt2r_anom_ssegs_anom_sseg_time = 0..36865] long_name: Start latitude standard_name: latitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Start latitude of the anomalous short segment, based on the average latitude of the first sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_start_lat fullnamepath: /gt2r/anom_ssegs/anom_sseg_start_lat coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lat gt2r_anom_ssegs_anom_sseg_lon |
| gt2r_anom_ssegs_anom_sseg_end_lat: | Array of 64 bit Reals [gt2r_anom_ssegs_anom_sseg_time = 0..36865] long_name: End latitude standard_name: latitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: End latitude of the anomalous short segment, based on the average latitude of the last sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_end_lat fullnamepath: /gt2r/anom_ssegs/anom_sseg_end_lat coordinates: gt2r_anom_ssegs_anom_sseg_time gt2r_anom_ssegs_anom_sseg_lat gt2r_anom_ssegs_anom_sseg_lon |
| gt2r_segment_podppd_flag: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 0 long_name: POD_PPD Flag units: 1 source: ATL02, ANC04, ANC05 valid_min: 0 valid_max: 7 contentType: referenceInformation description: Composite POD/PPD flag that indicates the quality of input geolocation products for the utilized ATL03 segments on an ATL13 short segment output basis. A non-zero value may indicate that geolocation solutions are degraded or that ATLAS is within a calibration scan period (CAL). The ATL03 sigma values should indicate the degree of uncertainty associated with the degradation. Possible non-CAL values are: 0=NOMINAL; 1=POD_DEGRADE; 2=PPD_DEGRADE; 3=PODPPD_DEGRADE; possible CAL values are: 4=CAL_NOMINAL; 5=CAL_POD_DEGRADE; 6=CAL_PPD_DEGRADE; 7=CAL_PODPPD_DEGRADE; flag_meanings: nominal pod_degrade ppd_degrade podppd_degrade cal_nominal cal_pod_degrade cal_ppd_degrade cal_podppd_degrade flag_values: 0, 1, 2, 3, 4, 5, 6, 7 origname: segment_podppd_flag fullnamepath: /gt2r/segment_podppd_flag coordinates: gt2r_delta_time |
| gt2r_qf_ht_adj: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Height adjustment Quality Flag units: 1 source: ATL13 ATBD, Section 5.3.5 (C) valid_min: -4 valid_max: 5 contentType: qualityInformation description: Flag representing the range of height, defined in 5.3.5 (C), which has been added to the apparent surface height due to frame of reference scaling during deconvolution analysis. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 below_threshold7 below_threshold8 equal_to_or_above_threshold8 invalid flag_values: -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 origname: qf_ht_adj fullnamepath: /gt2r/qf_ht_adj coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_full_sat_fract: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Full Saturation Fraction units: 1 source: ATL13 ATBD, Section 5.2 valid_min: 0.000000000 valid_max: 1.000000000 contentType: qualityInformation description: The fraction of pulses within the short segment determined to be fully saturated based on ATL03 geosegment rate input. origname: segment_full_sat_fract fullnamepath: /gt2r/segment_full_sat_fract coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_id_beg: | Array of 32 bit Integers [gt2r_delta_time = 0..60233] long_name: First ATL03 Segment ID units: 1 source: ATL03 contentType: referenceInformation description: First ATL03 segment_id associated with the photons within this inland water segment. origname: segment_id_beg fullnamepath: /gt2r/segment_id_beg coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_qf_subsurf_anomaly: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] units: 1 source: Inland Water ATBD 5.3.4(A) valid_min: 1 valid_max: 3 contentType: qualityInformation description: Describes the likelihood that the bottom or other subsurface anomaly is bottom based on the threshold value at which an anomaly was found. 1 = Subsurface anomaly due to bottom likely; 2 = Subsurface signal may indicate bottom or other anomaly; 3 = Possible subsurface anomaly; invalid = No subsurface anomaly detected flag_meanings: bottom_likely bottom_or_other_anomaly possible_subsurface_anomaly flag_values: 1, 2, 3 _FillValue: 127 long_name: Subsurface Anomaly Quality Flag origname: qf_subsurf_anomaly fullnamepath: /gt2r/qf_subsurf_anomaly coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_subsurface_attenuation: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Subsurface Attenuation units: m^-1 source: Section 5.3.4 (A) contentType: physicalMeasurement description: Subsurface attenuation coefficient. origname: subsurface_attenuation fullnamepath: /gt2r/subsurface_attenuation coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_layer_flag_atl09: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Consolidated cloud flag units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 1 contentType: qualityInformation description: Consolidated cloud flag. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 origname: layer_flag_atl09 fullnamepath: /gt2r/layer_flag_atl09 coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_inland_water_body_region: | Array of 32 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 2147483647 long_name: Body region units: 1 source: ATL13 ATBD, Section 5.3.1 (A) contentType: referenceInformation description: ATL13-created shapefile representing relevant bodies of water over which to implement the ATL13 water surface finding algorithm only within a region of processing interest. origname: inland_water_body_region fullnamepath: /gt2r/inland_water_body_region coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_sseg_end_lat: | Array of 64 bit Reals [gt2r_delta_time = 0..60233] long_name: End latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Latitude at which the short segment ends. May be a signal or non-signal photon. origname: sseg_end_lat fullnamepath: /gt2r/sseg_end_lat coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_cloud_flag_asr_atl09: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Cloud Flag ASR units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 5 contentType: modelResult description: Cloud probability from ASR. flag_meanings: clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence flag_values: 0, 1, 2, 3, 4, 5 origname: cloud_flag_asr_atl09 fullnamepath: /gt2r/cloud_flag_asr_atl09 coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_ice_flag: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Ice Flag units: 1 source: ATL13 ATBD, section 5.2 valid_min: 0 valid_max: 1 contentType: qualityInformation description: Describes likelihood of ice on water surface short segment. flag_meanings: no_ice ice flag_values: 0, 1 origname: ice_flag fullnamepath: /gt2r/ice_flag coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_sseg_start_lat: | Array of 64 bit Reals [gt2r_delta_time = 0..60233] long_name: Start latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude at which the short segment begins. May be a signal or non-signal photon. origname: sseg_start_lat fullnamepath: /gt2r/sseg_start_lat coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_ref_elev: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: elevation standard_name: elevation units: radians source: ATL13 ATBD, Section 5.3.5 (A) contentType: auxiliaryInformation 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. origname: segment_ref_elev fullnamepath: /gt2r/segment_ref_elev coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_lon: | Array of 64 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 1.7976931348623157e+308 long_name: Longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of reporting location for all short segment statistics. origname: segment_lon fullnamepath: /gt2r/segment_lon coordinates: gt2r_delta_time gt2r_segment_lat |
| gt2r_ht_ortho: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Orthometric Height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Orthometric height EGM2008 converted from ellipsoidal height. origname: ht_ortho fullnamepath: /gt2r/ht_ortho coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_lat: | Array of 64 bit Reals [gt2r_delta_time = 0..60233] long_name: Latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of reporting location for all short segment statistics. origname: segment_lat fullnamepath: /gt2r/segment_lat coordinates: gt2r_delta_time gt2r_segment_lon |
| gt2r_ht_water_surf: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Water surface height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Water surface height, reported for each short segment (default length = approximately 100 signal photons) with reference to WGS84 ellipsoid origname: ht_water_surf fullnamepath: /gt2r/ht_water_surf coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_near_sat_fract: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Near Saturation Fraction units: 1 source: ATL13 ATBD, Section 5.2 valid_min: 0.000000000 valid_max: 1.000000000 contentType: qualityInformation description: The fraction of pulses within the short segment determined to be nearly saturated based on ATL03 geosegment rate input. origname: segment_near_sat_fract fullnamepath: /gt2r/segment_near_sat_fract coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_err_ht_water_surf: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Height Error units: 1 source: section 5.3.3 (C) contentType: qualityInformation description: Error included in heights reported in ht_water_surf. origname: err_ht_water_surf fullnamepath: /gt2r/err_ht_water_surf coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_bottom_lon: | Array of 64 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 1.7976931348623157e+308 long_name: Mean longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of actual bottom location, based on the apparent bottom sseg_mean_lat / sseg_mean_lon location corrected for refraction effects. origname: bottom_lon fullnamepath: /gt2r/bottom_lon coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_bias_fit: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Goodness of fit bias units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Bias contribution from goodness of observation/system response fit. (Has been applied to ht_ortho and _ht_water_surf products) origname: segment_bias_fit fullnamepath: /gt2r/segment_bias_fit coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_qf_cloud: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Consolidated cloud flag units: 1 source: ATL09 valid_min: 0 valid_max: 1 contentType: qualityInformation description: This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow. From the ATL09 data closest to the segment time. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 origname: qf_cloud fullnamepath: /gt2r/qf_cloud coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_inland_water_body_source: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Body source units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 1 valid_max: 9 contentType: referenceInformation description: Source of Inland Water Body shape, where 1=HydroLAKES, 2=Global Lakes and Wetlands Database, 3=Named Marine Water Bodies, 4=GSHHG Shoreline, 5=Global River Widths from Landsat, 6=Reserved, 7=Reserved, 8=Reserved, 9=Reserved flag_meanings: HydroLAKES Global_Lakes_and_Wetlands_Database Named_Marine_Water_Bodies GSHHG_Shoreline Global_River_Widths_from_Landsat Reserved Reserved Reserved Reserved flag_values: 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_source fullnamepath: /gt2r/inland_water_body_source coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_tide_earth_free2mean: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Earth Tide Free-to-Mean conversion units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Segment rate value to convert solid earth tide from the tide-free system that was applied in ATL03 to photon heights to the ht_water_surf to the mean-tide system. Subtract value from ht_water_surf to reference it in the mean-tide system. Applicable value at reporting location for all short segment statistics. origname: segment_tide_earth_free2mean fullnamepath: /gt2r/segment_tide_earth_free2mean coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_qf_stdev_lseg: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: observed standard deviation quality flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Quality flag indicating the magnitude of standard deviation (SD) of observed detrended heights of the long segment to which the short segment belongs, where 0: SD < 0.5 (meters), 1: 0.5 <= SD < 1.5, 2: 1.5 <= SD < 2.5, 3: 2.5 <= SD < 3.5, 4: 3.5 <= SD < 4.5, 5: 4.5 <= SD < 5.5, 6: 5.5 <= SD < 6.5, 7: 6.5 <= SD < 7.5, 8: 7.5 <= SD < 8.5, 9: 8.5 <= SD. It is recommended that a user consider this flag in conjunction with the water body type and size to best determine if the observed surface standard deviation is reasonable or whether results should be considered questionable. flag_meanings: SD_below_0.5 SD_below_1.5 SD_below_2.5 SD_below_3.5 SD_below_4.5 SD_below_5.5 SD_below_6.5 SD_below_7.5 SD_below_8.5 SD_greater_or_equal_to_8.5 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_stdev_lseg fullnamepath: /gt2r/qf_stdev_lseg coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_dem_source: | Array of 32 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 2147483647 long_name: dem source flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 4 contentType: referenceInformation description: Flag equal to the source of the selected photon (in hierarchy of Arctic/Global/MSS/Antarctic). Values: 0=None, 1=Arctic, 2=Global, 3=MSS, 4=Antarctic. flag_meanings: none arctic global mss antarctic flag_values: 0, 1, 2, 3, 4 origname: segment_dem_source fullnamepath: /gt2r/segment_dem_source coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_fpb_correction: | Array of 64 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 1.7976931348623157e+308 long_name: First photon bias correction units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: First photon bias correction. May be applied at user disrection by subtracting from mean height produts ht_ortho and ht_water_surf. origname: segment_fpb_correction fullnamepath: /gt2r/segment_fpb_correction coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_inland_water_body_size: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Body size units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 0 valid_max: 9 contentType: referenceInformation description: Size of Inland Water Body, A=area, where 0=Not_Assigned, 1=A>10,000 sq km, 2=10,000>A>=1,000, 3=1,000>A>=100, 4=100>A>=10, 5=10>A>=1, 6=1>A>=0.1, 7=0.01>A, 8=Reserved, 9=Reserved flag_meanings: not_assigned area_gt_10000 10000_gt_area_ge_1000 1000_gt_area_ge_100 100_gt_area_ge_10 10_gt_area_ge_1 1_gt_area_ge_0.1 0.01_gt_area Reserved Reserved flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_size fullnamepath: /gt2r/inland_water_body_size coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_met_wind10_atl13: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Wind speed magnitude at 10m standard_name: Wind speed units: m/s source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Wind speed magnitude at 10m height, based on derived water surface wave height. origname: met_wind10_atl13 fullnamepath: /gt2r/met_wind10_atl13 coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_snow_ice_atl09: | Array of 32 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 2147483647 long_name: Snow Ice Flag units: 1 source: ATL13 ATBD, Section 5.3.5 (A) contentType: modelResult description: NOAA snow/ice flag scaled by ATL09 (0=ice-free water, 1=snow-free land, 2=snow, 3=ice, 127=invalid) flag_meanings: ice_free_water snow_free_land snow ice invalid flag_values: 0, 1, 2, 3, 127 origname: snow_ice_atl09 fullnamepath: /gt2r/snow_ice_atl09 coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_tide_ocean: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Segment Tide Ocean units: meters source: ATL03 contentType: auxiliaryInformation description: Ocean tides including diurnal and semi-diurnal (harmonic analysis (+-4 m)). Although available at short segment rate for all water body types, value is provide mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_tide_ocean fullnamepath: /gt2r/segment_tide_ocean coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_err_slope_trk: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] units: 1 _FillValue: 3.402823466e+38 long_name: Slope Error source: section 5.3.3 (C) contentType: qualityInformation description: Error included in segment_slope_trk_local. origname: err_slope_trk fullnamepath: /gt2r/err_slope_trk coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_slope_trk_bdy: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Water Body Slope units: m/m source: ATL13 ATBD, Section 5.3.5 (A) contentType: physicalMeasurement description: Along track water body surface slope, reported per short segment ID per water body. origname: segment_slope_trk_bdy fullnamepath: /gt2r/segment_slope_trk_bdy coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_sseg_mean_lat: | Array of 64 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 1.7976931348623157e+308 long_name: Mean latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Mean latitude of the signal-qualified photons in a short segment. origname: sseg_mean_lat fullnamepath: /gt2r/sseg_mean_lat coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_geoid_free2mean: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Geoid Free-to-Mean conversion units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Value to convert segment geoid heights from the mean-tide system to the tide-free system. Subtract this value from mean-tide system segment_geoid (on ATL13) to get geoid heights in the tide-free system. Applicable value at reporting location for all short segment statistics. origname: segment_geoid_free2mean fullnamepath: /gt2r/segment_geoid_free2mean coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_qf_spec_width: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Spectral width Flag units: 1 source: ATL13 ATBD, Section 4.8.8 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Spectral moments width flag. The flag is set as follows: 0 when spec_width is invalid; 1 when 0 <= spec_width <= 0.2; 2 when 0.2 < spec_width <= 0.3; 3 when 0.3 < spec_width <= 0.4; 4 when 0.4 < spec_width <= 0.5; 5 when 0.5 < spec_width <= 0.6; 6 when 0.6 < spec_width <= 0.7; 7 when 0.7 < spec_width <= 0.8; 8 when 0.8 < spec_width <= 0.9; 9 when 0.9 < spec_width. flag_meanings: invalid 0<=spec_width<=0.2 0.2 origname: qf_spec_width fullnamepath: /gt2r/qf_spec_width coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_qf_bckgrd: | Array of 16 bit Integers [gt2r_delta_time = 0..60233] _FillValue: 127 long_name: Background Quality Flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 6 contentType: qualityInformation description: Describes the degree of background photons present in each short segment. bckgrd_dnsty_threshold1= 0.001 (counts per bi per Lseg); bckgrd_dnsty_threshold2= 0.01 (counts per bin per Lseg); bckgrd_dnsty_threshold3= 0.05 (counts per bin per Lseg); bckgrd_dnsty_threshold4= 0.1 (counts per bin per Lseg); bckgrd_dnsty_threshold5= 0.3 (counts per bin per Lseg); bckgrd_dnsty_threshold6= 0.5 (counts per bin per Lseg) flag_meanings: equal_to_or_below_threshold1 equal_to_or_below_threshold2 equal_to_or_below_threshold3 equal_to_or_below_threshold4 equal_to_or_below_threshold5 equal_to_or_below_threshold6 above_threshold6 flag_values: 0, 1, 2, 3, 4, 5, 6 origname: qf_bckgrd fullnamepath: /gt2r/qf_bckgrd coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_sseg_mean_time: | Array of 64 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 1.7976931348623157e+308 long_name: Mean time standard_name: time units: Seconds since 2018-01-01 source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Mean time of the signal-qualified photons in a short segment. origname: sseg_mean_time fullnamepath: /gt2r/sseg_mean_time coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_met_ts_atl09: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Surface temperature standard_name: temperature units: K source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Surface (skin) temperature from ATL09. origname: met_ts_atl09 fullnamepath: /gt2r/met_ts_atl09 coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_bias_em: | Array of 64 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 1.7976931348623157e+308 long_name: Electromagnetic bias units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Electromagnetic bias. (Has been applied to ht_ortho and _ht_water_surf products) origname: segment_bias_em fullnamepath: /gt2r/segment_bias_em coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_dem_ht: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: DEM Height units: meters source: ATL13 ATBD, Section 5.3.5 contentType: referenceInformation description: DEM height relative to WGS-84 ellipsoid, reported at the short segment rate. origname: segment_dem_ht fullnamepath: /gt2r/segment_dem_ht coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_subsurface_backscat_ampltd: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Subsurface backscatter amplitude units: 1 source: Section 5.3.4 (A) contentType: modelResult description: Subsurface backscatter amplitude, described in section 4.5.3, reported per long segment (default length = 10 short segments = approximately 1000 signal photons). origname: subsurface_backscat_ampltd fullnamepath: /gt2r/subsurface_backscat_ampltd coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt2r_segment_dac: | Array of 32 bit Reals [gt2r_delta_time = 0..60233] _FillValue: 3.402823466e+38 long_name: Segment DAC units: meters source: ATBD Section 5.3.5A contentType: auxiliaryInformation description: Dynamic atmospheric correction (DAC) includes inverted barometer (IB) effect (+- 5 cm). Although available at short segment rate for all water body types, value is provided mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_dac fullnamepath: /gt2r/segment_dac coordinates: gt2r_delta_time gt2r_segment_lat gt2r_segment_lon |
| gt1l_rgt: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] long_name: Reference Ground track units: 1 source: ATL03 valid_min: 1 valid_max: 1387 contentType: referenceInformation 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 1,387 RGTs. origname: rgt fullnamepath: /gt1l/rgt coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_azimuth: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Azimuth standard_name: azimuth units: radians source: ATL13 ATBD, Section 5.3.5 (A) contentType: auxiliaryInformation description: The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees. origname: segment_azimuth fullnamepath: /gt1l/segment_azimuth coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_qf_bias_fit: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Height Bias Fit Quality Flag units: 1 source: Inland Water ATBD valid_min: -3 valid_max: 4 contentType: qualityInformation description: The height bias fit flag is set based on the value of the goodness of fit bias estimated as the difference between the centroid elevations of the observed surface water histogram and fitted integrated water surface model histogram. The flag values are set as follows: = -3 if H_bias_fit < -0.10 (m); -2 if -0.10 <= H_bias_fit < -0.05;-1 when -0.05 <= H_bias_fit < -0.01; 0 if -0.01 <= H_bias_fit < 0.01 (m); 1 if 0.01 <= H_bias_fit < 0.05; 2 if 0.05 < H_bias_fit < 0.10; 3 if 0.10 <= H_bias_fit; 4 if H_bias_fit is invalid. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 equal_to_or_above_threshold6 invalid flag_values: -3, -2, -1, 0, 1, 2, 3, 4 origname: qf_bias_fit fullnamepath: /gt1l/qf_bias_fit coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_sseg_mean_lon: | Array of 64 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 1.7976931348623157e+308 long_name: Mean longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Mean longitude of the signal-qualified photons in a short segment. origname: sseg_mean_lon fullnamepath: /gt1l/sseg_mean_lon coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_cloud_flag_atm_atl09: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Cloud Flag Atm units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 10 contentType: modelResult description: Cloud flag from backscatter profile. origname: cloud_flag_atm_atl09 fullnamepath: /gt1l/cloud_flag_atm_atl09 coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_qf_ice: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Ice Quality Flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 3 contentType: qualityInformation description: The quality flag for ice describes the likelihood of ice on the short water body surface segment. 0 for QF_Bckgrd<= 2; 1 for 2 < QF_Bckgrd<= 4; 2 for 4 < QF_Bckgrd; 3 for (4 < QF_Bckgrd and QF_Cloud=1) flag_meanings: qf_bckgrd_le_2 qf_bckgrd_le_4 qf_bckgrd_gt_4 qf_bckgrd_w_cloud flag_values: 0, 1, 2, 3 origname: qf_ice fullnamepath: /gt1l/qf_ice coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_transect_id: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Transect ID units: 1 source: ATL13 ATBD, Section 5.3.2 (C) contentType: referenceInformation description: Transect within a water body to which the short segment rate output belongs. origname: transect_id fullnamepath: /gt1l/transect_id coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_inland_water_body_type: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Body type units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 1 valid_max: 9 contentType: referenceInformation description: Type of Inland Water Body, where 1=Lake, 2=Known Reservoir, 3=(Reserved for future use), 4=Ephemeral Water, 5=River, 6=Estuary or Bay, 7=Coastal Water, 8=Reserved, 9=Reserved flag_meanings: Lake Known_Reservoir Reserved_for_future_use Ephemeral_Water River Estuary_or_Bay Coastal_Water Reserved Reserved flag_values: 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_type fullnamepath: /gt1l/inland_water_body_type coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_inland_water_body_id: | Array of 32 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 2147483647 long_name: Body ID units: 1 source: ATL13 ATBD, Section 5.3.1 (C) contentType: referenceInformation description: Identifying signature of an individual inland water body. Each body of water is represented by a unique numeric value. origname: inland_water_body_id fullnamepath: /gt1l/inland_water_body_id coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_sseg_end_lon: | Array of 64 bit Reals [gt1l_delta_time = 0..223696] long_name: End longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude at which the short segment ends. May be a signal or non-signal photon. origname: sseg_end_lon fullnamepath: /gt1l/sseg_end_lon coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_qf_subsurface_attenuation: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Subsurface attenuation quality flag units: 1 source: ATL13 ATBD, Section 5.3.4 (A) valid_min: -2 valid_max: 2 contentType: qualityInformation description: Quality flag indicating whether or not the reported subsurface attenuation was constrained during deconvolution by the minimum (initial) limit in the possible range (QF=-1), the maximum limit in the possible range (QF = 1), or was allowed to settle on a solution within the possible range (QF=0). For analysis prior to deconvolution of the subsurface attenuation fit to the observations, the flag indicates whether the value determined by attempting to fit the observations was below (QF= -2), above (QF= 2), or within (QF=0) the possible range of expected values. When the default value for subsurface attenuation is chosen due to any condition other than those defined by an existing quality flag, QF=invalid. flag_meanings: obs_fit_below_range initial_limit within_range maximum_limit obs_fit_above_range flag_values: -2, -1, 0, 1, 2 origname: qf_subsurface_attenuation fullnamepath: /gt1l/qf_subsurface_attenuation coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_quality: | Array of 32 bit Integers [gt1l_delta_time = 0..223696][ds_sseg_quality = 0..3] _FillValue: 2147483647 long_name: Segment quality group count units: 1 source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Four-element array of describing, for each short segment n, the count of photons qualifying in each quality group. (n,1) = nominal, (n,2) = possible afterpulse, (n,3) = possible impulse response effect, (n,4) = possible TEP origname: segment_quality fullnamepath: /gt1l/segment_quality coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_geoid: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Segment Geoid units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Applicable mean-tide system geoid value at reporting location for all short segment statistics. (see geoid_free2mean to convert to the tide-free system.) origname: segment_geoid fullnamepath: /gt1l/segment_geoid coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_qf_sseg_length: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Short Segment Length flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 9 contentType: qualityInformation description: Length of short segments flag. The flag is set as follows: 0 if sseg_length < 10 (meters); 1 if 10 <= sseg_length < 20 (meters); 2 if 20 <= sseg_length < 30 (meters); 3 if 30 <= sseg_length < 50 (meters); 4 if 50 <= sseg_length < 75 (meters); 5 if 75 <= sseg_length < 100 (meters); 6 if 100 <= sseg_length < 150 (meters); 7 if 150 <= sseg_length < 200 (meters); 8 if 200 <= sseg_length < 300 (meters); 9 if 300 <= sseg_length. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 below_threshold7 below_threshold8 below_threshold9 equal_to_or_above_threshold9 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_sseg_length fullnamepath: /gt1l/qf_sseg_length coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_sseg_start_lon: | Array of 64 bit Reals [gt1l_delta_time = 0..223696] long_name: Start longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude at which the short segment begins. May be a signal or non-signal photon. origname: sseg_start_lon fullnamepath: /gt1l/sseg_start_lon coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_tide_equilibrium: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Segment Tide Equilibrium units: meters source: ATL03 contentType: auxiliaryInformation description: Long period equilibrium tide self-consistent with ocean tide model (+- 0.04 m). Although available at short segment rate for all water body types, value is provide mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_tide_equilibrium fullnamepath: /gt1l/segment_tide_equilibrium coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_qf_lseg_length: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Long Segment Length flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 3 contentType: qualityInformation description: The Long Segment Length flag is set based on the length of the long segment. The flag is set as follows: 0 if Lseg_length < 500 (meters); 1 if 50 <= Lseg_length < 1500 (meters); 2 if 150 <= Lseg_length < 3000 (meters); 3 if 3000 <= Lseg_length flag_meanings: below_threshold1 below_threshold2 below_threshold3 above_threshold4 flag_values: 0, 1, 2, 3 origname: qf_lseg_length fullnamepath: /gt1l/qf_lseg_length coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_significant_wave_ht: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: SWH units: meters source: section 5.3.3 (C) contentType: physicalMeasurement description: Significant wave height origname: significant_wave_ht fullnamepath: /gt1l/significant_wave_ht coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_bottom_lat: | Array of 64 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 1.7976931348623157e+308 long_name: Bottom latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of actual bottom location, based on the apparent bottom sseg_mean_lat / sseg_mean_lon location corrected for refraction effects. origname: bottom_lat fullnamepath: /gt1l/bottom_lat coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_cycle_number: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] long_name: Cycle Number units: counts source: ATL03 valid_min: 0 valid_max: 50 contentType: referenceInformation 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 1,387 and adding the RGT value. origname: cycle_number fullnamepath: /gt1l/cycle_number coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_qf_subsurface_backscat_ampltd: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Subsurface backscatter amplitude quality flag units: 1 source: ATL13 ATBD, Section 5.3.4 (A) valid_min: -2 valid_max: 2 contentType: qualityInformation description: Quality flag indicating whether or not the reported subsurface backscatter amplitude was constrained during deconvolution by the minimum limit in the possible range (QF=-1), the maximum limit in the possible range (QF = 1), or was allowed to settle on a solution within the possible range (QF=0). For analysis prior to deconvolution of the backscatter amplitude fit to the observations, the flag indicates whether the value determined by attempting to fit the observations was below (QF= -2), above (QF= 2), or within (QF=0) the possible range of expected values. When the default value for backscatter amplitude is chosen due to any condition other than those defined by an existing quality flag, QF=invalid. flag_meanings: obs_fit_below_range initial_limit within_range maximum_limit obs_fit_above_range flag_values: -2, -1, 0, 1, 2 origname: qf_subsurface_backscat_ampltd fullnamepath: /gt1l/qf_subsurface_backscat_ampltd coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_water_depth: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Water depth units: meters source: ATL13 ATBD, Section 5.3.4 (A) contentType: referenceInformation description: Depth from the mean water surface to detected bottom. origname: water_depth fullnamepath: /gt1l/water_depth coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_qf_bias_em: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: EM Bias Quality Flag units: 1 source: Inland Water ATBD valid_min: -3 valid_max: 4 contentType: qualityInformation description: The Electromagnetic Bias flag is set based on threshold checks for the estimated electromagnetic height bias. The flag is set as follows: -3 if H_bias_EM < -0.10 (m); -2 if -0.10 < H_bias_EM < -0.05; -1 if -0.05 <= H_bias_EM < -0.01; 0 if -0.01 <= H_bias_EM < 0.01 (m); 1 if 0.01 <= H_bias_EM < 0.05; 2 if 0.05 <= H_bias_EM < 0.10; 3 if 0.10 < H_bias_EM; 4 if H_bias_EM is invalid. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 above_threshold6 invalid flag_values: -3, -2, -1, 0, 1, 2, 3, 4 origname: qf_bias_em fullnamepath: /gt1l/qf_bias_em coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_id_end: | Array of 32 bit Integers [gt1l_delta_time = 0..223696] long_name: Last ATL03 Segment ID units: 1 source: ATL03 contentType: referenceInformation description: Last ATL03 segment_id associated with the photons within this inland water segment. origname: segment_id_end fullnamepath: /gt1l/segment_id_end coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_qf_stdev_vlseg: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: observed standard deviation quality flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Quality flag indicating the magnitude of standard deviation (SD) of observed detrended heights of the very long segment to which the short segment belongs, where 0: SD < 0.5 (meters), 1: 0.5 <= SD < 1.5, 2: 1.5 <= SD < 2.5, 3: 2.5 <= SD < 3.5, 4: 3.5 <= SD < 4.5, 5: 4.5 <= SD < 5.5, 6: 5.5 <= SD < 6.5, 7: 6.5 <= SD < 7.5, 8: 7.5 <= SD < 8.5, 9: 8.5 <= SD. It is recommended that a user consider this flag in conjunction with the water body type and size to best determine if the observed surface standard deviation is reasonable or whether results should be considered questionable. flag_meanings: SD_below_0.5 SD_below_1.5 SD_below_2.5 SD_below_3.5 SD_below_4.5 SD_below_5.5 SD_below_6.5 SD_below_7.5 SD_below_8.5 SD_greater_or_equal_to_8.5 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_stdev_vlseg fullnamepath: /gt1l/qf_stdev_vlseg coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_apparent_ht: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Apparent height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Apparent height of the short segment, before adjustments are made by the algorithm, based on an average of heights within a designated range of the short segment mode. origname: segment_apparent_ht fullnamepath: /gt1l/segment_apparent_ht coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_stdev_water_surf: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Surface StDev units: meters source: section 5.3.3 (C) contentType: referenceInformation description: Standard deviation of water surface, calculated over long segments with result reported at each short segment location tag contained within. origname: stdev_water_surf fullnamepath: /gt1l/stdev_water_surf coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_met_wind10_atl09: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Wind speed magnitude at 10m standard_name: Wind speed units: m/s source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Wind speed magnitude at 10m height from ATL09 input. origname: met_wind10_atl09 fullnamepath: /gt1l/met_wind10_atl09 coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_qf_iwp: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Inland Water Segment Processing Flag units: 1 source: Inland Water ATBD valid_min: 1 valid_max: 7 contentType: qualityInformation description: Describes the level of processing the inland water algorithm was able to perform based on the data available, ranging from one to 7. flag_meanings: 1_short_segment 2_short_segments 3_to_5_short_segments 6_to_7_short_segments 8_to_9_short_segments 10_to_29_short_segments at_least_30_short_segments flag_values: 1, 2, 3, 4, 5, 6, 7 origname: qf_iwp fullnamepath: /gt1l/qf_iwp coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_anom_ssegs_rgt: | Array of 16 bit Integers [gt1l_anom_ssegs_anom_sseg_time = 0..113504] long_name: Reference Ground track units: 1 source: ATL03 valid_min: 1 valid_max: 1387 contentType: referenceInformation 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 1,387 RGTs. origname: rgt fullnamepath: /gt1l/anom_ssegs/rgt coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lat gt1l_anom_ssegs_anom_sseg_lon |
| gt1l_anom_ssegs_anom_sseg_trigger_flag: | Array of 16 bit Integers [gt1l_anom_ssegs_anom_sseg_time = 0..113504][ds_anom_trigger = 0..8] _FillValue: 127 long_name: Anomalous classification flag units: 1 source: ATL13 ATBD, Table 5-4b valid_min: 0 valid_max: 1 contentType: qualityInformation description: Nine element array describing justification for short segment classification as anomalous, where for each element 0 = not triggered as anomalous and 1 = triggered as anomalous due to any of the following causes: [element 1=coarse ht difference, element 2=abnormal length, element 3= histogram mode spread, element 4=histogram mode count, element 5=histogram mode intensity, element 6=invalid long segment, element 7=shore buffer designation, element 8=insufficient signal phs, element 9=transect coarse water height unavailable against which to test short segment height] flag_meanings: not_triggered_as_anomalous triggered_as_anomalous flag_values: 0, 1 origname: anom_sseg_trigger_flag fullnamepath: /gt1l/anom_ssegs/anom_sseg_trigger_flag coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lat gt1l_anom_ssegs_anom_sseg_lon |
| gt1l_anom_ssegs_anom_sseg_quality: | Array of 32 bit Integers [gt1l_anom_ssegs_anom_sseg_time = 0..113504][ds_sseg_quality = 0..3] long_name: Segment quality group count units: 1 source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Four-element array of describing, for each anomalous short segment n, the count of photons qualifying in each quality group. (n,1) = nominal, (n,2) = possible afterpulse, (n,3) = possible impulse response effect, (n,4) = possible TEP _FillValue: 2147483647 origname: anom_sseg_quality fullnamepath: /gt1l/anom_ssegs/anom_sseg_quality coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lat gt1l_anom_ssegs_anom_sseg_lon |
| gt1l_anom_ssegs_transect_id: | Array of 16 bit Integers [gt1l_anom_ssegs_anom_sseg_time = 0..113504] _FillValue: 127 long_name: Transect ID units: 1 source: ATL13 ATBD, Section 5.3.2 (C) contentType: referenceInformation description: Transect within a water body to which the short segment rate output belongs. origname: transect_id fullnamepath: /gt1l/anom_ssegs/transect_id coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lat gt1l_anom_ssegs_anom_sseg_lon |
| gt1l_anom_ssegs_cycle_number: | Array of 16 bit Integers [gt1l_anom_ssegs_anom_sseg_time = 0..113504] long_name: Cycle Number units: counts source: ATL03 valid_min: 0 valid_max: 50 contentType: referenceInformation 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 1,387 and adding the RGT value. origname: cycle_number fullnamepath: /gt1l/anom_ssegs/cycle_number coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lat gt1l_anom_ssegs_anom_sseg_lon |
| gt1l_anom_ssegs_anom_sseg_lat: | Array of 64 bit Reals [gt1l_anom_ssegs_anom_sseg_time = 0..113504] long_name: Latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of the short segment (mean of signal class >=2 ph Lats). origname: anom_sseg_lat fullnamepath: /gt1l/anom_ssegs/anom_sseg_lat coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lon |
| gt1l_anom_ssegs_anom_sseg_stdev: | Array of 32 bit Reals [gt1l_anom_ssegs_anom_sseg_time = 0..113504] _FillValue: 3.402823466e+38 long_name: Segment standard deviation units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Standard deviation of anomalous short segment photon height in the anomalous short segment with signal classification >=2. origname: anom_sseg_stdev fullnamepath: /gt1l/anom_ssegs/anom_sseg_stdev coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lat gt1l_anom_ssegs_anom_sseg_lon |
| gt1l_anom_ssegs_anom_sseg_ht_delta: | Array of 32 bit Reals [gt1l_anom_ssegs_anom_sseg_time = 0..113504] _FillValue: 3.402823466e+38 long_name: Height difference units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Height difference between anom_sseg_mode of the anomalous short segment and the transect coarse_transect_ht. origname: anom_sseg_ht_delta fullnamepath: /gt1l/anom_ssegs/anom_sseg_ht_delta coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lat gt1l_anom_ssegs_anom_sseg_lon |
| gt1l_anom_ssegs_anom_sseg_length: | Array of 64 bit Reals [gt1l_anom_ssegs_anom_sseg_time = 0..113504] _FillValue: 1.7976931348623157e+308 long_name: Segment length units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Length of the short segment, based on end points computed by the average of sseg_endpoint_avg_n signal photons. origname: anom_sseg_length fullnamepath: /gt1l/anom_ssegs/anom_sseg_length coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lat gt1l_anom_ssegs_anom_sseg_lon |
| gt1l_anom_ssegs_anom_sseg_end_lon: | Array of 64 bit Reals [gt1l_anom_ssegs_anom_sseg_time = 0..113504] long_name: End longitude standard_name: longitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: End longitude of the anomalous short segment, based on the average longitude of the last sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_end_lon fullnamepath: /gt1l/anom_ssegs/anom_sseg_end_lon coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lat gt1l_anom_ssegs_anom_sseg_lon |
| gt1l_anom_ssegs_coarse_transect_ht: | Array of 32 bit Reals [gt1l_anom_ssegs_anom_sseg_time = 0..113504] _FillValue: 3.402823466e+38 long_name: Coarse water height units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Coarse water height of transect. origname: coarse_transect_ht fullnamepath: /gt1l/anom_ssegs/coarse_transect_ht coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lat gt1l_anom_ssegs_anom_sseg_lon |
| gt1l_anom_ssegs_anom_sseg_mode: | Array of 32 bit Reals [gt1l_anom_ssegs_anom_sseg_time = 0..113504] _FillValue: 3.402823466e+38 long_name: Anomalous mode bin height units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Height of anomalous short segment as determined by histogram bin mode. origname: anom_sseg_mode fullnamepath: /gt1l/anom_ssegs/anom_sseg_mode coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lat gt1l_anom_ssegs_anom_sseg_lon |
| gt1l_anom_ssegs_anom_sseg_lon: | Array of 64 bit Reals [gt1l_anom_ssegs_anom_sseg_time = 0..113504] long_name: Longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of the short segment (mean of signal class >=2 ph Lons). origname: anom_sseg_lon fullnamepath: /gt1l/anom_ssegs/anom_sseg_lon coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lat |
| gt1l_anom_ssegs_anom_sseg_start_lon: | Array of 64 bit Reals [gt1l_anom_ssegs_anom_sseg_time = 0..113504] long_name: Start longitude standard_name: longitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Start longitude of the anomalous short segment, based on the average longitude of the first sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_start_lon fullnamepath: /gt1l/anom_ssegs/anom_sseg_start_lon coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lat gt1l_anom_ssegs_anom_sseg_lon |
| gt1l_anom_ssegs_anom_sseg_mean_ht_ortho: | Array of 32 bit Reals [gt1l_anom_ssegs_anom_sseg_time = 0..113504] _FillValue: 3.402823466e+38 long_name: Orthometric Height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Orthometric height of anomalous short segment as determined by the mean of photon orthometric heights in the anomalous short segment with signal classification >2 origname: anom_sseg_mean_ht_ortho fullnamepath: /gt1l/anom_ssegs/anom_sseg_mean_ht_ortho coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lat gt1l_anom_ssegs_anom_sseg_lon |
| gt1l_anom_ssegs_anom_sseg_start_lat: | Array of 64 bit Reals [gt1l_anom_ssegs_anom_sseg_time = 0..113504] long_name: Start latitude standard_name: latitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Start latitude of the anomalous short segment, based on the average latitude of the first sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_start_lat fullnamepath: /gt1l/anom_ssegs/anom_sseg_start_lat coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lat gt1l_anom_ssegs_anom_sseg_lon |
| gt1l_anom_ssegs_anom_sseg_end_lat: | Array of 64 bit Reals [gt1l_anom_ssegs_anom_sseg_time = 0..113504] long_name: End latitude standard_name: latitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: End latitude of the anomalous short segment, based on the average latitude of the last sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_end_lat fullnamepath: /gt1l/anom_ssegs/anom_sseg_end_lat coordinates: gt1l_anom_ssegs_anom_sseg_time gt1l_anom_ssegs_anom_sseg_lat gt1l_anom_ssegs_anom_sseg_lon |
| gt1l_segment_podppd_flag: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 0 long_name: POD_PPD Flag units: 1 source: ATL02, ANC04, ANC05 valid_min: 0 valid_max: 7 contentType: referenceInformation description: Composite POD/PPD flag that indicates the quality of input geolocation products for the utilized ATL03 segments on an ATL13 short segment output basis. A non-zero value may indicate that geolocation solutions are degraded or that ATLAS is within a calibration scan period (CAL). The ATL03 sigma values should indicate the degree of uncertainty associated with the degradation. Possible non-CAL values are: 0=NOMINAL; 1=POD_DEGRADE; 2=PPD_DEGRADE; 3=PODPPD_DEGRADE; possible CAL values are: 4=CAL_NOMINAL; 5=CAL_POD_DEGRADE; 6=CAL_PPD_DEGRADE; 7=CAL_PODPPD_DEGRADE; flag_meanings: nominal pod_degrade ppd_degrade podppd_degrade cal_nominal cal_pod_degrade cal_ppd_degrade cal_podppd_degrade flag_values: 0, 1, 2, 3, 4, 5, 6, 7 origname: segment_podppd_flag fullnamepath: /gt1l/segment_podppd_flag coordinates: gt1l_delta_time |
| gt1l_qf_ht_adj: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Height adjustment Quality Flag units: 1 source: ATL13 ATBD, Section 5.3.5 (C) valid_min: -4 valid_max: 5 contentType: qualityInformation description: Flag representing the range of height, defined in 5.3.5 (C), which has been added to the apparent surface height due to frame of reference scaling during deconvolution analysis. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 below_threshold7 below_threshold8 equal_to_or_above_threshold8 invalid flag_values: -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 origname: qf_ht_adj fullnamepath: /gt1l/qf_ht_adj coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_full_sat_fract: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Full Saturation Fraction units: 1 source: ATL13 ATBD, Section 5.2 valid_min: 0.000000000 valid_max: 1.000000000 contentType: qualityInformation description: The fraction of pulses within the short segment determined to be fully saturated based on ATL03 geosegment rate input. origname: segment_full_sat_fract fullnamepath: /gt1l/segment_full_sat_fract coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_id_beg: | Array of 32 bit Integers [gt1l_delta_time = 0..223696] long_name: First ATL03 Segment ID units: 1 source: ATL03 contentType: referenceInformation description: First ATL03 segment_id associated with the photons within this inland water segment. origname: segment_id_beg fullnamepath: /gt1l/segment_id_beg coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_qf_subsurf_anomaly: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] units: 1 source: Inland Water ATBD 5.3.4(A) valid_min: 1 valid_max: 3 contentType: qualityInformation description: Describes the likelihood that the bottom or other subsurface anomaly is bottom based on the threshold value at which an anomaly was found. 1 = Subsurface anomaly due to bottom likely; 2 = Subsurface signal may indicate bottom or other anomaly; 3 = Possible subsurface anomaly; invalid = No subsurface anomaly detected flag_meanings: bottom_likely bottom_or_other_anomaly possible_subsurface_anomaly flag_values: 1, 2, 3 _FillValue: 127 long_name: Subsurface Anomaly Quality Flag origname: qf_subsurf_anomaly fullnamepath: /gt1l/qf_subsurf_anomaly coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_subsurface_attenuation: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Subsurface Attenuation units: m^-1 source: Section 5.3.4 (A) contentType: physicalMeasurement description: Subsurface attenuation coefficient. origname: subsurface_attenuation fullnamepath: /gt1l/subsurface_attenuation coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_layer_flag_atl09: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Consolidated cloud flag units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 1 contentType: qualityInformation description: Consolidated cloud flag. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 origname: layer_flag_atl09 fullnamepath: /gt1l/layer_flag_atl09 coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_inland_water_body_region: | Array of 32 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 2147483647 long_name: Body region units: 1 source: ATL13 ATBD, Section 5.3.1 (A) contentType: referenceInformation description: ATL13-created shapefile representing relevant bodies of water over which to implement the ATL13 water surface finding algorithm only within a region of processing interest. origname: inland_water_body_region fullnamepath: /gt1l/inland_water_body_region coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_sseg_end_lat: | Array of 64 bit Reals [gt1l_delta_time = 0..223696] long_name: End latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Latitude at which the short segment ends. May be a signal or non-signal photon. origname: sseg_end_lat fullnamepath: /gt1l/sseg_end_lat coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_cloud_flag_asr_atl09: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Cloud Flag ASR units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 5 contentType: modelResult description: Cloud probability from ASR. flag_meanings: clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence flag_values: 0, 1, 2, 3, 4, 5 origname: cloud_flag_asr_atl09 fullnamepath: /gt1l/cloud_flag_asr_atl09 coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_ice_flag: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Ice Flag units: 1 source: ATL13 ATBD, section 5.2 valid_min: 0 valid_max: 1 contentType: qualityInformation description: Describes likelihood of ice on water surface short segment. flag_meanings: no_ice ice flag_values: 0, 1 origname: ice_flag fullnamepath: /gt1l/ice_flag coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_sseg_start_lat: | Array of 64 bit Reals [gt1l_delta_time = 0..223696] long_name: Start latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude at which the short segment begins. May be a signal or non-signal photon. origname: sseg_start_lat fullnamepath: /gt1l/sseg_start_lat coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_ref_elev: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: elevation standard_name: elevation units: radians source: ATL13 ATBD, Section 5.3.5 (A) contentType: auxiliaryInformation 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. origname: segment_ref_elev fullnamepath: /gt1l/segment_ref_elev coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_lon: | Array of 64 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 1.7976931348623157e+308 long_name: Longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of reporting location for all short segment statistics. origname: segment_lon fullnamepath: /gt1l/segment_lon coordinates: gt1l_delta_time gt1l_segment_lat |
| gt1l_ht_ortho: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Orthometric Height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Orthometric height EGM2008 converted from ellipsoidal height. origname: ht_ortho fullnamepath: /gt1l/ht_ortho coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_lat: | Array of 64 bit Reals [gt1l_delta_time = 0..223696] long_name: Latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of reporting location for all short segment statistics. origname: segment_lat fullnamepath: /gt1l/segment_lat coordinates: gt1l_delta_time gt1l_segment_lon |
| gt1l_ht_water_surf: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Water surface height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Water surface height, reported for each short segment (default length = approximately 100 signal photons) with reference to WGS84 ellipsoid origname: ht_water_surf fullnamepath: /gt1l/ht_water_surf coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_near_sat_fract: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Near Saturation Fraction units: 1 source: ATL13 ATBD, Section 5.2 valid_min: 0.000000000 valid_max: 1.000000000 contentType: qualityInformation description: The fraction of pulses within the short segment determined to be nearly saturated based on ATL03 geosegment rate input. origname: segment_near_sat_fract fullnamepath: /gt1l/segment_near_sat_fract coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_err_ht_water_surf: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Height Error units: 1 source: section 5.3.3 (C) contentType: qualityInformation description: Error included in heights reported in ht_water_surf. origname: err_ht_water_surf fullnamepath: /gt1l/err_ht_water_surf coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_bottom_lon: | Array of 64 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 1.7976931348623157e+308 long_name: Mean longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of actual bottom location, based on the apparent bottom sseg_mean_lat / sseg_mean_lon location corrected for refraction effects. origname: bottom_lon fullnamepath: /gt1l/bottom_lon coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_bias_fit: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Goodness of fit bias units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Bias contribution from goodness of observation/system response fit. (Has been applied to ht_ortho and _ht_water_surf products) origname: segment_bias_fit fullnamepath: /gt1l/segment_bias_fit coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_qf_cloud: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Consolidated cloud flag units: 1 source: ATL09 valid_min: 0 valid_max: 1 contentType: qualityInformation description: This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow. From the ATL09 data closest to the segment time. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 origname: qf_cloud fullnamepath: /gt1l/qf_cloud coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_inland_water_body_source: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Body source units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 1 valid_max: 9 contentType: referenceInformation description: Source of Inland Water Body shape, where 1=HydroLAKES, 2=Global Lakes and Wetlands Database, 3=Named Marine Water Bodies, 4=GSHHG Shoreline, 5=Global River Widths from Landsat, 6=Reserved, 7=Reserved, 8=Reserved, 9=Reserved flag_meanings: HydroLAKES Global_Lakes_and_Wetlands_Database Named_Marine_Water_Bodies GSHHG_Shoreline Global_River_Widths_from_Landsat Reserved Reserved Reserved Reserved flag_values: 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_source fullnamepath: /gt1l/inland_water_body_source coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_tide_earth_free2mean: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Earth Tide Free-to-Mean conversion units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Segment rate value to convert solid earth tide from the tide-free system that was applied in ATL03 to photon heights to the ht_water_surf to the mean-tide system. Subtract value from ht_water_surf to reference it in the mean-tide system. Applicable value at reporting location for all short segment statistics. origname: segment_tide_earth_free2mean fullnamepath: /gt1l/segment_tide_earth_free2mean coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_qf_stdev_lseg: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: observed standard deviation quality flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Quality flag indicating the magnitude of standard deviation (SD) of observed detrended heights of the long segment to which the short segment belongs, where 0: SD < 0.5 (meters), 1: 0.5 <= SD < 1.5, 2: 1.5 <= SD < 2.5, 3: 2.5 <= SD < 3.5, 4: 3.5 <= SD < 4.5, 5: 4.5 <= SD < 5.5, 6: 5.5 <= SD < 6.5, 7: 6.5 <= SD < 7.5, 8: 7.5 <= SD < 8.5, 9: 8.5 <= SD. It is recommended that a user consider this flag in conjunction with the water body type and size to best determine if the observed surface standard deviation is reasonable or whether results should be considered questionable. flag_meanings: SD_below_0.5 SD_below_1.5 SD_below_2.5 SD_below_3.5 SD_below_4.5 SD_below_5.5 SD_below_6.5 SD_below_7.5 SD_below_8.5 SD_greater_or_equal_to_8.5 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_stdev_lseg fullnamepath: /gt1l/qf_stdev_lseg coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_dem_source: | Array of 32 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 2147483647 long_name: dem source flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 4 contentType: referenceInformation description: Flag equal to the source of the selected photon (in hierarchy of Arctic/Global/MSS/Antarctic). Values: 0=None, 1=Arctic, 2=Global, 3=MSS, 4=Antarctic. flag_meanings: none arctic global mss antarctic flag_values: 0, 1, 2, 3, 4 origname: segment_dem_source fullnamepath: /gt1l/segment_dem_source coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_fpb_correction: | Array of 64 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 1.7976931348623157e+308 long_name: First photon bias correction units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: First photon bias correction. May be applied at user disrection by subtracting from mean height produts ht_ortho and ht_water_surf. origname: segment_fpb_correction fullnamepath: /gt1l/segment_fpb_correction coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_inland_water_body_size: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Body size units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 0 valid_max: 9 contentType: referenceInformation description: Size of Inland Water Body, A=area, where 0=Not_Assigned, 1=A>10,000 sq km, 2=10,000>A>=1,000, 3=1,000>A>=100, 4=100>A>=10, 5=10>A>=1, 6=1>A>=0.1, 7=0.01>A, 8=Reserved, 9=Reserved flag_meanings: not_assigned area_gt_10000 10000_gt_area_ge_1000 1000_gt_area_ge_100 100_gt_area_ge_10 10_gt_area_ge_1 1_gt_area_ge_0.1 0.01_gt_area Reserved Reserved flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_size fullnamepath: /gt1l/inland_water_body_size coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_met_wind10_atl13: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Wind speed magnitude at 10m standard_name: Wind speed units: m/s source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Wind speed magnitude at 10m height, based on derived water surface wave height. origname: met_wind10_atl13 fullnamepath: /gt1l/met_wind10_atl13 coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_snow_ice_atl09: | Array of 32 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 2147483647 long_name: Snow Ice Flag units: 1 source: ATL13 ATBD, Section 5.3.5 (A) contentType: modelResult description: NOAA snow/ice flag scaled by ATL09 (0=ice-free water, 1=snow-free land, 2=snow, 3=ice, 127=invalid) flag_meanings: ice_free_water snow_free_land snow ice invalid flag_values: 0, 1, 2, 3, 127 origname: snow_ice_atl09 fullnamepath: /gt1l/snow_ice_atl09 coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_tide_ocean: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Segment Tide Ocean units: meters source: ATL03 contentType: auxiliaryInformation description: Ocean tides including diurnal and semi-diurnal (harmonic analysis (+-4 m)). Although available at short segment rate for all water body types, value is provide mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_tide_ocean fullnamepath: /gt1l/segment_tide_ocean coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_err_slope_trk: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] units: 1 _FillValue: 3.402823466e+38 long_name: Slope Error source: section 5.3.3 (C) contentType: qualityInformation description: Error included in segment_slope_trk_local. origname: err_slope_trk fullnamepath: /gt1l/err_slope_trk coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_slope_trk_bdy: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Water Body Slope units: m/m source: ATL13 ATBD, Section 5.3.5 (A) contentType: physicalMeasurement description: Along track water body surface slope, reported per short segment ID per water body. origname: segment_slope_trk_bdy fullnamepath: /gt1l/segment_slope_trk_bdy coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_sseg_mean_lat: | Array of 64 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 1.7976931348623157e+308 long_name: Mean latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Mean latitude of the signal-qualified photons in a short segment. origname: sseg_mean_lat fullnamepath: /gt1l/sseg_mean_lat coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_geoid_free2mean: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Geoid Free-to-Mean conversion units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Value to convert segment geoid heights from the mean-tide system to the tide-free system. Subtract this value from mean-tide system segment_geoid (on ATL13) to get geoid heights in the tide-free system. Applicable value at reporting location for all short segment statistics. origname: segment_geoid_free2mean fullnamepath: /gt1l/segment_geoid_free2mean coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_qf_spec_width: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Spectral width Flag units: 1 source: ATL13 ATBD, Section 4.8.8 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Spectral moments width flag. The flag is set as follows: 0 when spec_width is invalid; 1 when 0 <= spec_width <= 0.2; 2 when 0.2 < spec_width <= 0.3; 3 when 0.3 < spec_width <= 0.4; 4 when 0.4 < spec_width <= 0.5; 5 when 0.5 < spec_width <= 0.6; 6 when 0.6 < spec_width <= 0.7; 7 when 0.7 < spec_width <= 0.8; 8 when 0.8 < spec_width <= 0.9; 9 when 0.9 < spec_width. flag_meanings: invalid 0<=spec_width<=0.2 0.2 origname: qf_spec_width fullnamepath: /gt1l/qf_spec_width coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_qf_bckgrd: | Array of 16 bit Integers [gt1l_delta_time = 0..223696] _FillValue: 127 long_name: Background Quality Flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 6 contentType: qualityInformation description: Describes the degree of background photons present in each short segment. bckgrd_dnsty_threshold1= 0.001 (counts per bi per Lseg); bckgrd_dnsty_threshold2= 0.01 (counts per bin per Lseg); bckgrd_dnsty_threshold3= 0.05 (counts per bin per Lseg); bckgrd_dnsty_threshold4= 0.1 (counts per bin per Lseg); bckgrd_dnsty_threshold5= 0.3 (counts per bin per Lseg); bckgrd_dnsty_threshold6= 0.5 (counts per bin per Lseg) flag_meanings: equal_to_or_below_threshold1 equal_to_or_below_threshold2 equal_to_or_below_threshold3 equal_to_or_below_threshold4 equal_to_or_below_threshold5 equal_to_or_below_threshold6 above_threshold6 flag_values: 0, 1, 2, 3, 4, 5, 6 origname: qf_bckgrd fullnamepath: /gt1l/qf_bckgrd coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_sseg_mean_time: | Array of 64 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 1.7976931348623157e+308 long_name: Mean time standard_name: time units: Seconds since 2018-01-01 source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Mean time of the signal-qualified photons in a short segment. origname: sseg_mean_time fullnamepath: /gt1l/sseg_mean_time coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_met_ts_atl09: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Surface temperature standard_name: temperature units: K source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Surface (skin) temperature from ATL09. origname: met_ts_atl09 fullnamepath: /gt1l/met_ts_atl09 coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_bias_em: | Array of 64 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 1.7976931348623157e+308 long_name: Electromagnetic bias units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Electromagnetic bias. (Has been applied to ht_ortho and _ht_water_surf products) origname: segment_bias_em fullnamepath: /gt1l/segment_bias_em coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_dem_ht: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: DEM Height units: meters source: ATL13 ATBD, Section 5.3.5 contentType: referenceInformation description: DEM height relative to WGS-84 ellipsoid, reported at the short segment rate. origname: segment_dem_ht fullnamepath: /gt1l/segment_dem_ht coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_subsurface_backscat_ampltd: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Subsurface backscatter amplitude units: 1 source: Section 5.3.4 (A) contentType: modelResult description: Subsurface backscatter amplitude, described in section 4.5.3, reported per long segment (default length = 10 short segments = approximately 1000 signal photons). origname: subsurface_backscat_ampltd fullnamepath: /gt1l/subsurface_backscat_ampltd coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| gt1l_segment_dac: | Array of 32 bit Reals [gt1l_delta_time = 0..223696] _FillValue: 3.402823466e+38 long_name: Segment DAC units: meters source: ATBD Section 5.3.5A contentType: auxiliaryInformation description: Dynamic atmospheric correction (DAC) includes inverted barometer (IB) effect (+- 5 cm). Although available at short segment rate for all water body types, value is provided mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_dac fullnamepath: /gt1l/segment_dac coordinates: gt1l_delta_time gt1l_segment_lat gt1l_segment_lon |
| quality_assessment_qa_granule_fail_reason: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Granule Failure Reason units: 1 source: Operations valid_min: 0 valid_max: 5 contentType: qualityInformation description: Flag indicating granule failure reason. 0=no failure; 1=processing failure; 2=insufficient data; 3=TBD3; 4=TBD4; 5=TBD5 flag_meanings: no_failure processing_failure insufficient_data TBD3 TBD4 TBD5 flag_values: 0, 1, 2, 3, 4, 5 origname: qa_granule_fail_reason fullnamepath: /quality_assessment/qa_granule_fail_reason |
| quality_assessment_qa_granule_pass_fail: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Granule Pass Flag units: 1 source: Operations valid_min: 0 valid_max: 1 contentType: qualityInformation description: Flag indicating granule quality. 0=granule passes automatic QA. 1=granule fails automatic QA. flag_meanings: PASS FAIL flag_values: 0, 1 origname: qa_granule_pass_fail fullnamepath: /quality_assessment/qa_granule_pass_fail |
| gt3l_rgt: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] long_name: Reference Ground track units: 1 source: ATL03 valid_min: 1 valid_max: 1387 contentType: referenceInformation 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 1,387 RGTs. origname: rgt fullnamepath: /gt3l/rgt coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_azimuth: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Azimuth standard_name: azimuth units: radians source: ATL13 ATBD, Section 5.3.5 (A) contentType: auxiliaryInformation description: The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees. origname: segment_azimuth fullnamepath: /gt3l/segment_azimuth coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_qf_bias_fit: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Height Bias Fit Quality Flag units: 1 source: Inland Water ATBD valid_min: -3 valid_max: 4 contentType: qualityInformation description: The height bias fit flag is set based on the value of the goodness of fit bias estimated as the difference between the centroid elevations of the observed surface water histogram and fitted integrated water surface model histogram. The flag values are set as follows: = -3 if H_bias_fit < -0.10 (m); -2 if -0.10 <= H_bias_fit < -0.05;-1 when -0.05 <= H_bias_fit < -0.01; 0 if -0.01 <= H_bias_fit < 0.01 (m); 1 if 0.01 <= H_bias_fit < 0.05; 2 if 0.05 < H_bias_fit < 0.10; 3 if 0.10 <= H_bias_fit; 4 if H_bias_fit is invalid. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 equal_to_or_above_threshold6 invalid flag_values: -3, -2, -1, 0, 1, 2, 3, 4 origname: qf_bias_fit fullnamepath: /gt3l/qf_bias_fit coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_sseg_mean_lon: | Array of 64 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 1.7976931348623157e+308 long_name: Mean longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Mean longitude of the signal-qualified photons in a short segment. origname: sseg_mean_lon fullnamepath: /gt3l/sseg_mean_lon coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_cloud_flag_atm_atl09: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Cloud Flag Atm units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 10 contentType: modelResult description: Cloud flag from backscatter profile. origname: cloud_flag_atm_atl09 fullnamepath: /gt3l/cloud_flag_atm_atl09 coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_qf_ice: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Ice Quality Flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 3 contentType: qualityInformation description: The quality flag for ice describes the likelihood of ice on the short water body surface segment. 0 for QF_Bckgrd<= 2; 1 for 2 < QF_Bckgrd<= 4; 2 for 4 < QF_Bckgrd; 3 for (4 < QF_Bckgrd and QF_Cloud=1) flag_meanings: qf_bckgrd_le_2 qf_bckgrd_le_4 qf_bckgrd_gt_4 qf_bckgrd_w_cloud flag_values: 0, 1, 2, 3 origname: qf_ice fullnamepath: /gt3l/qf_ice coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_transect_id: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Transect ID units: 1 source: ATL13 ATBD, Section 5.3.2 (C) contentType: referenceInformation description: Transect within a water body to which the short segment rate output belongs. origname: transect_id fullnamepath: /gt3l/transect_id coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_inland_water_body_type: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Body type units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 1 valid_max: 9 contentType: referenceInformation description: Type of Inland Water Body, where 1=Lake, 2=Known Reservoir, 3=(Reserved for future use), 4=Ephemeral Water, 5=River, 6=Estuary or Bay, 7=Coastal Water, 8=Reserved, 9=Reserved flag_meanings: Lake Known_Reservoir Reserved_for_future_use Ephemeral_Water River Estuary_or_Bay Coastal_Water Reserved Reserved flag_values: 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_type fullnamepath: /gt3l/inland_water_body_type coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_inland_water_body_id: | Array of 32 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 2147483647 long_name: Body ID units: 1 source: ATL13 ATBD, Section 5.3.1 (C) contentType: referenceInformation description: Identifying signature of an individual inland water body. Each body of water is represented by a unique numeric value. origname: inland_water_body_id fullnamepath: /gt3l/inland_water_body_id coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_sseg_end_lon: | Array of 64 bit Reals [gt3l_delta_time = 0..221604] long_name: End longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude at which the short segment ends. May be a signal or non-signal photon. origname: sseg_end_lon fullnamepath: /gt3l/sseg_end_lon coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_qf_subsurface_attenuation: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Subsurface attenuation quality flag units: 1 source: ATL13 ATBD, Section 5.3.4 (A) valid_min: -2 valid_max: 2 contentType: qualityInformation description: Quality flag indicating whether or not the reported subsurface attenuation was constrained during deconvolution by the minimum (initial) limit in the possible range (QF=-1), the maximum limit in the possible range (QF = 1), or was allowed to settle on a solution within the possible range (QF=0). For analysis prior to deconvolution of the subsurface attenuation fit to the observations, the flag indicates whether the value determined by attempting to fit the observations was below (QF= -2), above (QF= 2), or within (QF=0) the possible range of expected values. When the default value for subsurface attenuation is chosen due to any condition other than those defined by an existing quality flag, QF=invalid. flag_meanings: obs_fit_below_range initial_limit within_range maximum_limit obs_fit_above_range flag_values: -2, -1, 0, 1, 2 origname: qf_subsurface_attenuation fullnamepath: /gt3l/qf_subsurface_attenuation coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_quality: | Array of 32 bit Integers [gt3l_delta_time = 0..221604][ds_sseg_quality = 0..3] _FillValue: 2147483647 long_name: Segment quality group count units: 1 source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Four-element array of describing, for each short segment n, the count of photons qualifying in each quality group. (n,1) = nominal, (n,2) = possible afterpulse, (n,3) = possible impulse response effect, (n,4) = possible TEP origname: segment_quality fullnamepath: /gt3l/segment_quality coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_geoid: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Segment Geoid units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Applicable mean-tide system geoid value at reporting location for all short segment statistics. (see geoid_free2mean to convert to the tide-free system.) origname: segment_geoid fullnamepath: /gt3l/segment_geoid coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_qf_sseg_length: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Short Segment Length flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 9 contentType: qualityInformation description: Length of short segments flag. The flag is set as follows: 0 if sseg_length < 10 (meters); 1 if 10 <= sseg_length < 20 (meters); 2 if 20 <= sseg_length < 30 (meters); 3 if 30 <= sseg_length < 50 (meters); 4 if 50 <= sseg_length < 75 (meters); 5 if 75 <= sseg_length < 100 (meters); 6 if 100 <= sseg_length < 150 (meters); 7 if 150 <= sseg_length < 200 (meters); 8 if 200 <= sseg_length < 300 (meters); 9 if 300 <= sseg_length. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 below_threshold7 below_threshold8 below_threshold9 equal_to_or_above_threshold9 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_sseg_length fullnamepath: /gt3l/qf_sseg_length coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_sseg_start_lon: | Array of 64 bit Reals [gt3l_delta_time = 0..221604] long_name: Start longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude at which the short segment begins. May be a signal or non-signal photon. origname: sseg_start_lon fullnamepath: /gt3l/sseg_start_lon coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_tide_equilibrium: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Segment Tide Equilibrium units: meters source: ATL03 contentType: auxiliaryInformation description: Long period equilibrium tide self-consistent with ocean tide model (+- 0.04 m). Although available at short segment rate for all water body types, value is provide mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_tide_equilibrium fullnamepath: /gt3l/segment_tide_equilibrium coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_qf_lseg_length: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Long Segment Length flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 3 contentType: qualityInformation description: The Long Segment Length flag is set based on the length of the long segment. The flag is set as follows: 0 if Lseg_length < 500 (meters); 1 if 50 <= Lseg_length < 1500 (meters); 2 if 150 <= Lseg_length < 3000 (meters); 3 if 3000 <= Lseg_length flag_meanings: below_threshold1 below_threshold2 below_threshold3 above_threshold4 flag_values: 0, 1, 2, 3 origname: qf_lseg_length fullnamepath: /gt3l/qf_lseg_length coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_significant_wave_ht: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: SWH units: meters source: section 5.3.3 (C) contentType: physicalMeasurement description: Significant wave height origname: significant_wave_ht fullnamepath: /gt3l/significant_wave_ht coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_bottom_lat: | Array of 64 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 1.7976931348623157e+308 long_name: Bottom latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of actual bottom location, based on the apparent bottom sseg_mean_lat / sseg_mean_lon location corrected for refraction effects. origname: bottom_lat fullnamepath: /gt3l/bottom_lat coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_cycle_number: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] long_name: Cycle Number units: counts source: ATL03 valid_min: 0 valid_max: 50 contentType: referenceInformation 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 1,387 and adding the RGT value. origname: cycle_number fullnamepath: /gt3l/cycle_number coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_qf_subsurface_backscat_ampltd: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Subsurface backscatter amplitude quality flag units: 1 source: ATL13 ATBD, Section 5.3.4 (A) valid_min: -2 valid_max: 2 contentType: qualityInformation description: Quality flag indicating whether or not the reported subsurface backscatter amplitude was constrained during deconvolution by the minimum limit in the possible range (QF=-1), the maximum limit in the possible range (QF = 1), or was allowed to settle on a solution within the possible range (QF=0). For analysis prior to deconvolution of the backscatter amplitude fit to the observations, the flag indicates whether the value determined by attempting to fit the observations was below (QF= -2), above (QF= 2), or within (QF=0) the possible range of expected values. When the default value for backscatter amplitude is chosen due to any condition other than those defined by an existing quality flag, QF=invalid. flag_meanings: obs_fit_below_range initial_limit within_range maximum_limit obs_fit_above_range flag_values: -2, -1, 0, 1, 2 origname: qf_subsurface_backscat_ampltd fullnamepath: /gt3l/qf_subsurface_backscat_ampltd coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_water_depth: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Water depth units: meters source: ATL13 ATBD, Section 5.3.4 (A) contentType: referenceInformation description: Depth from the mean water surface to detected bottom. origname: water_depth fullnamepath: /gt3l/water_depth coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_qf_bias_em: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: EM Bias Quality Flag units: 1 source: Inland Water ATBD valid_min: -3 valid_max: 4 contentType: qualityInformation description: The Electromagnetic Bias flag is set based on threshold checks for the estimated electromagnetic height bias. The flag is set as follows: -3 if H_bias_EM < -0.10 (m); -2 if -0.10 < H_bias_EM < -0.05; -1 if -0.05 <= H_bias_EM < -0.01; 0 if -0.01 <= H_bias_EM < 0.01 (m); 1 if 0.01 <= H_bias_EM < 0.05; 2 if 0.05 <= H_bias_EM < 0.10; 3 if 0.10 < H_bias_EM; 4 if H_bias_EM is invalid. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 above_threshold6 invalid flag_values: -3, -2, -1, 0, 1, 2, 3, 4 origname: qf_bias_em fullnamepath: /gt3l/qf_bias_em coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_id_end: | Array of 32 bit Integers [gt3l_delta_time = 0..221604] long_name: Last ATL03 Segment ID units: 1 source: ATL03 contentType: referenceInformation description: Last ATL03 segment_id associated with the photons within this inland water segment. origname: segment_id_end fullnamepath: /gt3l/segment_id_end coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_qf_stdev_vlseg: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: observed standard deviation quality flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Quality flag indicating the magnitude of standard deviation (SD) of observed detrended heights of the very long segment to which the short segment belongs, where 0: SD < 0.5 (meters), 1: 0.5 <= SD < 1.5, 2: 1.5 <= SD < 2.5, 3: 2.5 <= SD < 3.5, 4: 3.5 <= SD < 4.5, 5: 4.5 <= SD < 5.5, 6: 5.5 <= SD < 6.5, 7: 6.5 <= SD < 7.5, 8: 7.5 <= SD < 8.5, 9: 8.5 <= SD. It is recommended that a user consider this flag in conjunction with the water body type and size to best determine if the observed surface standard deviation is reasonable or whether results should be considered questionable. flag_meanings: SD_below_0.5 SD_below_1.5 SD_below_2.5 SD_below_3.5 SD_below_4.5 SD_below_5.5 SD_below_6.5 SD_below_7.5 SD_below_8.5 SD_greater_or_equal_to_8.5 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_stdev_vlseg fullnamepath: /gt3l/qf_stdev_vlseg coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_apparent_ht: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Apparent height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Apparent height of the short segment, before adjustments are made by the algorithm, based on an average of heights within a designated range of the short segment mode. origname: segment_apparent_ht fullnamepath: /gt3l/segment_apparent_ht coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_stdev_water_surf: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Surface StDev units: meters source: section 5.3.3 (C) contentType: referenceInformation description: Standard deviation of water surface, calculated over long segments with result reported at each short segment location tag contained within. origname: stdev_water_surf fullnamepath: /gt3l/stdev_water_surf coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_met_wind10_atl09: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Wind speed magnitude at 10m standard_name: Wind speed units: m/s source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Wind speed magnitude at 10m height from ATL09 input. origname: met_wind10_atl09 fullnamepath: /gt3l/met_wind10_atl09 coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_qf_iwp: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Inland Water Segment Processing Flag units: 1 source: Inland Water ATBD valid_min: 1 valid_max: 7 contentType: qualityInformation description: Describes the level of processing the inland water algorithm was able to perform based on the data available, ranging from one to 7. flag_meanings: 1_short_segment 2_short_segments 3_to_5_short_segments 6_to_7_short_segments 8_to_9_short_segments 10_to_29_short_segments at_least_30_short_segments flag_values: 1, 2, 3, 4, 5, 6, 7 origname: qf_iwp fullnamepath: /gt3l/qf_iwp coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_anom_ssegs_rgt: | Array of 16 bit Integers [gt3l_anom_ssegs_anom_sseg_time = 0..105767] long_name: Reference Ground track units: 1 source: ATL03 valid_min: 1 valid_max: 1387 contentType: referenceInformation 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 1,387 RGTs. origname: rgt fullnamepath: /gt3l/anom_ssegs/rgt coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lat gt3l_anom_ssegs_anom_sseg_lon |
| gt3l_anom_ssegs_anom_sseg_trigger_flag: | Array of 16 bit Integers [gt3l_anom_ssegs_anom_sseg_time = 0..105767][ds_anom_trigger = 0..8] _FillValue: 127 long_name: Anomalous classification flag units: 1 source: ATL13 ATBD, Table 5-4b valid_min: 0 valid_max: 1 contentType: qualityInformation description: Nine element array describing justification for short segment classification as anomalous, where for each element 0 = not triggered as anomalous and 1 = triggered as anomalous due to any of the following causes: [element 1=coarse ht difference, element 2=abnormal length, element 3= histogram mode spread, element 4=histogram mode count, element 5=histogram mode intensity, element 6=invalid long segment, element 7=shore buffer designation, element 8=insufficient signal phs, element 9=transect coarse water height unavailable against which to test short segment height] flag_meanings: not_triggered_as_anomalous triggered_as_anomalous flag_values: 0, 1 origname: anom_sseg_trigger_flag fullnamepath: /gt3l/anom_ssegs/anom_sseg_trigger_flag coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lat gt3l_anom_ssegs_anom_sseg_lon |
| gt3l_anom_ssegs_anom_sseg_quality: | Array of 32 bit Integers [gt3l_anom_ssegs_anom_sseg_time = 0..105767][ds_sseg_quality = 0..3] long_name: Segment quality group count units: 1 source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Four-element array of describing, for each anomalous short segment n, the count of photons qualifying in each quality group. (n,1) = nominal, (n,2) = possible afterpulse, (n,3) = possible impulse response effect, (n,4) = possible TEP _FillValue: 2147483647 origname: anom_sseg_quality fullnamepath: /gt3l/anom_ssegs/anom_sseg_quality coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lat gt3l_anom_ssegs_anom_sseg_lon |
| gt3l_anom_ssegs_transect_id: | Array of 16 bit Integers [gt3l_anom_ssegs_anom_sseg_time = 0..105767] _FillValue: 127 long_name: Transect ID units: 1 source: ATL13 ATBD, Section 5.3.2 (C) contentType: referenceInformation description: Transect within a water body to which the short segment rate output belongs. origname: transect_id fullnamepath: /gt3l/anom_ssegs/transect_id coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lat gt3l_anom_ssegs_anom_sseg_lon |
| gt3l_anom_ssegs_cycle_number: | Array of 16 bit Integers [gt3l_anom_ssegs_anom_sseg_time = 0..105767] long_name: Cycle Number units: counts source: ATL03 valid_min: 0 valid_max: 50 contentType: referenceInformation 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 1,387 and adding the RGT value. origname: cycle_number fullnamepath: /gt3l/anom_ssegs/cycle_number coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lat gt3l_anom_ssegs_anom_sseg_lon |
| gt3l_anom_ssegs_anom_sseg_lat: | Array of 64 bit Reals [gt3l_anom_ssegs_anom_sseg_time = 0..105767] long_name: Latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of the short segment (mean of signal class >=2 ph Lats). origname: anom_sseg_lat fullnamepath: /gt3l/anom_ssegs/anom_sseg_lat coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lon |
| gt3l_anom_ssegs_anom_sseg_stdev: | Array of 32 bit Reals [gt3l_anom_ssegs_anom_sseg_time = 0..105767] _FillValue: 3.402823466e+38 long_name: Segment standard deviation units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Standard deviation of anomalous short segment photon height in the anomalous short segment with signal classification >=2. origname: anom_sseg_stdev fullnamepath: /gt3l/anom_ssegs/anom_sseg_stdev coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lat gt3l_anom_ssegs_anom_sseg_lon |
| gt3l_anom_ssegs_anom_sseg_ht_delta: | Array of 32 bit Reals [gt3l_anom_ssegs_anom_sseg_time = 0..105767] _FillValue: 3.402823466e+38 long_name: Height difference units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Height difference between anom_sseg_mode of the anomalous short segment and the transect coarse_transect_ht. origname: anom_sseg_ht_delta fullnamepath: /gt3l/anom_ssegs/anom_sseg_ht_delta coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lat gt3l_anom_ssegs_anom_sseg_lon |
| gt3l_anom_ssegs_anom_sseg_length: | Array of 64 bit Reals [gt3l_anom_ssegs_anom_sseg_time = 0..105767] _FillValue: 1.7976931348623157e+308 long_name: Segment length units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Length of the short segment, based on end points computed by the average of sseg_endpoint_avg_n signal photons. origname: anom_sseg_length fullnamepath: /gt3l/anom_ssegs/anom_sseg_length coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lat gt3l_anom_ssegs_anom_sseg_lon |
| gt3l_anom_ssegs_anom_sseg_end_lon: | Array of 64 bit Reals [gt3l_anom_ssegs_anom_sseg_time = 0..105767] long_name: End longitude standard_name: longitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: End longitude of the anomalous short segment, based on the average longitude of the last sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_end_lon fullnamepath: /gt3l/anom_ssegs/anom_sseg_end_lon coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lat gt3l_anom_ssegs_anom_sseg_lon |
| gt3l_anom_ssegs_coarse_transect_ht: | Array of 32 bit Reals [gt3l_anom_ssegs_anom_sseg_time = 0..105767] _FillValue: 3.402823466e+38 long_name: Coarse water height units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Coarse water height of transect. origname: coarse_transect_ht fullnamepath: /gt3l/anom_ssegs/coarse_transect_ht coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lat gt3l_anom_ssegs_anom_sseg_lon |
| gt3l_anom_ssegs_anom_sseg_mode: | Array of 32 bit Reals [gt3l_anom_ssegs_anom_sseg_time = 0..105767] _FillValue: 3.402823466e+38 long_name: Anomalous mode bin height units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Height of anomalous short segment as determined by histogram bin mode. origname: anom_sseg_mode fullnamepath: /gt3l/anom_ssegs/anom_sseg_mode coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lat gt3l_anom_ssegs_anom_sseg_lon |
| gt3l_anom_ssegs_anom_sseg_lon: | Array of 64 bit Reals [gt3l_anom_ssegs_anom_sseg_time = 0..105767] long_name: Longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of the short segment (mean of signal class >=2 ph Lons). origname: anom_sseg_lon fullnamepath: /gt3l/anom_ssegs/anom_sseg_lon coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lat |
| gt3l_anom_ssegs_anom_sseg_start_lon: | Array of 64 bit Reals [gt3l_anom_ssegs_anom_sseg_time = 0..105767] long_name: Start longitude standard_name: longitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Start longitude of the anomalous short segment, based on the average longitude of the first sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_start_lon fullnamepath: /gt3l/anom_ssegs/anom_sseg_start_lon coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lat gt3l_anom_ssegs_anom_sseg_lon |
| gt3l_anom_ssegs_anom_sseg_mean_ht_ortho: | Array of 32 bit Reals [gt3l_anom_ssegs_anom_sseg_time = 0..105767] _FillValue: 3.402823466e+38 long_name: Orthometric Height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Orthometric height of anomalous short segment as determined by the mean of photon orthometric heights in the anomalous short segment with signal classification >2 origname: anom_sseg_mean_ht_ortho fullnamepath: /gt3l/anom_ssegs/anom_sseg_mean_ht_ortho coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lat gt3l_anom_ssegs_anom_sseg_lon |
| gt3l_anom_ssegs_anom_sseg_start_lat: | Array of 64 bit Reals [gt3l_anom_ssegs_anom_sseg_time = 0..105767] long_name: Start latitude standard_name: latitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Start latitude of the anomalous short segment, based on the average latitude of the first sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_start_lat fullnamepath: /gt3l/anom_ssegs/anom_sseg_start_lat coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lat gt3l_anom_ssegs_anom_sseg_lon |
| gt3l_anom_ssegs_anom_sseg_end_lat: | Array of 64 bit Reals [gt3l_anom_ssegs_anom_sseg_time = 0..105767] long_name: End latitude standard_name: latitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: End latitude of the anomalous short segment, based on the average latitude of the last sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_end_lat fullnamepath: /gt3l/anom_ssegs/anom_sseg_end_lat coordinates: gt3l_anom_ssegs_anom_sseg_time gt3l_anom_ssegs_anom_sseg_lat gt3l_anom_ssegs_anom_sseg_lon |
| gt3l_segment_podppd_flag: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 0 long_name: POD_PPD Flag units: 1 source: ATL02, ANC04, ANC05 valid_min: 0 valid_max: 7 contentType: referenceInformation description: Composite POD/PPD flag that indicates the quality of input geolocation products for the utilized ATL03 segments on an ATL13 short segment output basis. A non-zero value may indicate that geolocation solutions are degraded or that ATLAS is within a calibration scan period (CAL). The ATL03 sigma values should indicate the degree of uncertainty associated with the degradation. Possible non-CAL values are: 0=NOMINAL; 1=POD_DEGRADE; 2=PPD_DEGRADE; 3=PODPPD_DEGRADE; possible CAL values are: 4=CAL_NOMINAL; 5=CAL_POD_DEGRADE; 6=CAL_PPD_DEGRADE; 7=CAL_PODPPD_DEGRADE; flag_meanings: nominal pod_degrade ppd_degrade podppd_degrade cal_nominal cal_pod_degrade cal_ppd_degrade cal_podppd_degrade flag_values: 0, 1, 2, 3, 4, 5, 6, 7 origname: segment_podppd_flag fullnamepath: /gt3l/segment_podppd_flag coordinates: gt3l_delta_time |
| gt3l_qf_ht_adj: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Height adjustment Quality Flag units: 1 source: ATL13 ATBD, Section 5.3.5 (C) valid_min: -4 valid_max: 5 contentType: qualityInformation description: Flag representing the range of height, defined in 5.3.5 (C), which has been added to the apparent surface height due to frame of reference scaling during deconvolution analysis. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 below_threshold7 below_threshold8 equal_to_or_above_threshold8 invalid flag_values: -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 origname: qf_ht_adj fullnamepath: /gt3l/qf_ht_adj coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_full_sat_fract: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Full Saturation Fraction units: 1 source: ATL13 ATBD, Section 5.2 valid_min: 0.000000000 valid_max: 1.000000000 contentType: qualityInformation description: The fraction of pulses within the short segment determined to be fully saturated based on ATL03 geosegment rate input. origname: segment_full_sat_fract fullnamepath: /gt3l/segment_full_sat_fract coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_id_beg: | Array of 32 bit Integers [gt3l_delta_time = 0..221604] long_name: First ATL03 Segment ID units: 1 source: ATL03 contentType: referenceInformation description: First ATL03 segment_id associated with the photons within this inland water segment. origname: segment_id_beg fullnamepath: /gt3l/segment_id_beg coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_qf_subsurf_anomaly: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] units: 1 source: Inland Water ATBD 5.3.4(A) valid_min: 1 valid_max: 3 contentType: qualityInformation description: Describes the likelihood that the bottom or other subsurface anomaly is bottom based on the threshold value at which an anomaly was found. 1 = Subsurface anomaly due to bottom likely; 2 = Subsurface signal may indicate bottom or other anomaly; 3 = Possible subsurface anomaly; invalid = No subsurface anomaly detected flag_meanings: bottom_likely bottom_or_other_anomaly possible_subsurface_anomaly flag_values: 1, 2, 3 _FillValue: 127 long_name: Subsurface Anomaly Quality Flag origname: qf_subsurf_anomaly fullnamepath: /gt3l/qf_subsurf_anomaly coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_subsurface_attenuation: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Subsurface Attenuation units: m^-1 source: Section 5.3.4 (A) contentType: physicalMeasurement description: Subsurface attenuation coefficient. origname: subsurface_attenuation fullnamepath: /gt3l/subsurface_attenuation coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_layer_flag_atl09: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Consolidated cloud flag units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 1 contentType: qualityInformation description: Consolidated cloud flag. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 origname: layer_flag_atl09 fullnamepath: /gt3l/layer_flag_atl09 coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_inland_water_body_region: | Array of 32 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 2147483647 long_name: Body region units: 1 source: ATL13 ATBD, Section 5.3.1 (A) contentType: referenceInformation description: ATL13-created shapefile representing relevant bodies of water over which to implement the ATL13 water surface finding algorithm only within a region of processing interest. origname: inland_water_body_region fullnamepath: /gt3l/inland_water_body_region coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_sseg_end_lat: | Array of 64 bit Reals [gt3l_delta_time = 0..221604] long_name: End latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Latitude at which the short segment ends. May be a signal or non-signal photon. origname: sseg_end_lat fullnamepath: /gt3l/sseg_end_lat coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_cloud_flag_asr_atl09: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Cloud Flag ASR units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 5 contentType: modelResult description: Cloud probability from ASR. flag_meanings: clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence flag_values: 0, 1, 2, 3, 4, 5 origname: cloud_flag_asr_atl09 fullnamepath: /gt3l/cloud_flag_asr_atl09 coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_ice_flag: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Ice Flag units: 1 source: ATL13 ATBD, section 5.2 valid_min: 0 valid_max: 1 contentType: qualityInformation description: Describes likelihood of ice on water surface short segment. flag_meanings: no_ice ice flag_values: 0, 1 origname: ice_flag fullnamepath: /gt3l/ice_flag coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_sseg_start_lat: | Array of 64 bit Reals [gt3l_delta_time = 0..221604] long_name: Start latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude at which the short segment begins. May be a signal or non-signal photon. origname: sseg_start_lat fullnamepath: /gt3l/sseg_start_lat coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_ref_elev: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: elevation standard_name: elevation units: radians source: ATL13 ATBD, Section 5.3.5 (A) contentType: auxiliaryInformation 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. origname: segment_ref_elev fullnamepath: /gt3l/segment_ref_elev coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_lon: | Array of 64 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 1.7976931348623157e+308 long_name: Longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of reporting location for all short segment statistics. origname: segment_lon fullnamepath: /gt3l/segment_lon coordinates: gt3l_delta_time gt3l_segment_lat |
| gt3l_ht_ortho: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Orthometric Height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Orthometric height EGM2008 converted from ellipsoidal height. origname: ht_ortho fullnamepath: /gt3l/ht_ortho coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_lat: | Array of 64 bit Reals [gt3l_delta_time = 0..221604] long_name: Latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of reporting location for all short segment statistics. origname: segment_lat fullnamepath: /gt3l/segment_lat coordinates: gt3l_delta_time gt3l_segment_lon |
| gt3l_ht_water_surf: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Water surface height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Water surface height, reported for each short segment (default length = approximately 100 signal photons) with reference to WGS84 ellipsoid origname: ht_water_surf fullnamepath: /gt3l/ht_water_surf coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_near_sat_fract: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Near Saturation Fraction units: 1 source: ATL13 ATBD, Section 5.2 valid_min: 0.000000000 valid_max: 1.000000000 contentType: qualityInformation description: The fraction of pulses within the short segment determined to be nearly saturated based on ATL03 geosegment rate input. origname: segment_near_sat_fract fullnamepath: /gt3l/segment_near_sat_fract coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_err_ht_water_surf: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Height Error units: 1 source: section 5.3.3 (C) contentType: qualityInformation description: Error included in heights reported in ht_water_surf. origname: err_ht_water_surf fullnamepath: /gt3l/err_ht_water_surf coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_bottom_lon: | Array of 64 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 1.7976931348623157e+308 long_name: Mean longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of actual bottom location, based on the apparent bottom sseg_mean_lat / sseg_mean_lon location corrected for refraction effects. origname: bottom_lon fullnamepath: /gt3l/bottom_lon coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_bias_fit: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Goodness of fit bias units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Bias contribution from goodness of observation/system response fit. (Has been applied to ht_ortho and _ht_water_surf products) origname: segment_bias_fit fullnamepath: /gt3l/segment_bias_fit coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_qf_cloud: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Consolidated cloud flag units: 1 source: ATL09 valid_min: 0 valid_max: 1 contentType: qualityInformation description: This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow. From the ATL09 data closest to the segment time. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 origname: qf_cloud fullnamepath: /gt3l/qf_cloud coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_inland_water_body_source: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Body source units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 1 valid_max: 9 contentType: referenceInformation description: Source of Inland Water Body shape, where 1=HydroLAKES, 2=Global Lakes and Wetlands Database, 3=Named Marine Water Bodies, 4=GSHHG Shoreline, 5=Global River Widths from Landsat, 6=Reserved, 7=Reserved, 8=Reserved, 9=Reserved flag_meanings: HydroLAKES Global_Lakes_and_Wetlands_Database Named_Marine_Water_Bodies GSHHG_Shoreline Global_River_Widths_from_Landsat Reserved Reserved Reserved Reserved flag_values: 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_source fullnamepath: /gt3l/inland_water_body_source coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_tide_earth_free2mean: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Earth Tide Free-to-Mean conversion units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Segment rate value to convert solid earth tide from the tide-free system that was applied in ATL03 to photon heights to the ht_water_surf to the mean-tide system. Subtract value from ht_water_surf to reference it in the mean-tide system. Applicable value at reporting location for all short segment statistics. origname: segment_tide_earth_free2mean fullnamepath: /gt3l/segment_tide_earth_free2mean coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_qf_stdev_lseg: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: observed standard deviation quality flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Quality flag indicating the magnitude of standard deviation (SD) of observed detrended heights of the long segment to which the short segment belongs, where 0: SD < 0.5 (meters), 1: 0.5 <= SD < 1.5, 2: 1.5 <= SD < 2.5, 3: 2.5 <= SD < 3.5, 4: 3.5 <= SD < 4.5, 5: 4.5 <= SD < 5.5, 6: 5.5 <= SD < 6.5, 7: 6.5 <= SD < 7.5, 8: 7.5 <= SD < 8.5, 9: 8.5 <= SD. It is recommended that a user consider this flag in conjunction with the water body type and size to best determine if the observed surface standard deviation is reasonable or whether results should be considered questionable. flag_meanings: SD_below_0.5 SD_below_1.5 SD_below_2.5 SD_below_3.5 SD_below_4.5 SD_below_5.5 SD_below_6.5 SD_below_7.5 SD_below_8.5 SD_greater_or_equal_to_8.5 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_stdev_lseg fullnamepath: /gt3l/qf_stdev_lseg coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_dem_source: | Array of 32 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 2147483647 long_name: dem source flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 4 contentType: referenceInformation description: Flag equal to the source of the selected photon (in hierarchy of Arctic/Global/MSS/Antarctic). Values: 0=None, 1=Arctic, 2=Global, 3=MSS, 4=Antarctic. flag_meanings: none arctic global mss antarctic flag_values: 0, 1, 2, 3, 4 origname: segment_dem_source fullnamepath: /gt3l/segment_dem_source coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_fpb_correction: | Array of 64 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 1.7976931348623157e+308 long_name: First photon bias correction units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: First photon bias correction. May be applied at user disrection by subtracting from mean height produts ht_ortho and ht_water_surf. origname: segment_fpb_correction fullnamepath: /gt3l/segment_fpb_correction coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_inland_water_body_size: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Body size units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 0 valid_max: 9 contentType: referenceInformation description: Size of Inland Water Body, A=area, where 0=Not_Assigned, 1=A>10,000 sq km, 2=10,000>A>=1,000, 3=1,000>A>=100, 4=100>A>=10, 5=10>A>=1, 6=1>A>=0.1, 7=0.01>A, 8=Reserved, 9=Reserved flag_meanings: not_assigned area_gt_10000 10000_gt_area_ge_1000 1000_gt_area_ge_100 100_gt_area_ge_10 10_gt_area_ge_1 1_gt_area_ge_0.1 0.01_gt_area Reserved Reserved flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_size fullnamepath: /gt3l/inland_water_body_size coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_met_wind10_atl13: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Wind speed magnitude at 10m standard_name: Wind speed units: m/s source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Wind speed magnitude at 10m height, based on derived water surface wave height. origname: met_wind10_atl13 fullnamepath: /gt3l/met_wind10_atl13 coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_snow_ice_atl09: | Array of 32 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 2147483647 long_name: Snow Ice Flag units: 1 source: ATL13 ATBD, Section 5.3.5 (A) contentType: modelResult description: NOAA snow/ice flag scaled by ATL09 (0=ice-free water, 1=snow-free land, 2=snow, 3=ice, 127=invalid) flag_meanings: ice_free_water snow_free_land snow ice invalid flag_values: 0, 1, 2, 3, 127 origname: snow_ice_atl09 fullnamepath: /gt3l/snow_ice_atl09 coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_tide_ocean: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Segment Tide Ocean units: meters source: ATL03 contentType: auxiliaryInformation description: Ocean tides including diurnal and semi-diurnal (harmonic analysis (+-4 m)). Although available at short segment rate for all water body types, value is provide mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_tide_ocean fullnamepath: /gt3l/segment_tide_ocean coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_err_slope_trk: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] units: 1 _FillValue: 3.402823466e+38 long_name: Slope Error source: section 5.3.3 (C) contentType: qualityInformation description: Error included in segment_slope_trk_local. origname: err_slope_trk fullnamepath: /gt3l/err_slope_trk coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_slope_trk_bdy: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Water Body Slope units: m/m source: ATL13 ATBD, Section 5.3.5 (A) contentType: physicalMeasurement description: Along track water body surface slope, reported per short segment ID per water body. origname: segment_slope_trk_bdy fullnamepath: /gt3l/segment_slope_trk_bdy coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_sseg_mean_lat: | Array of 64 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 1.7976931348623157e+308 long_name: Mean latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Mean latitude of the signal-qualified photons in a short segment. origname: sseg_mean_lat fullnamepath: /gt3l/sseg_mean_lat coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_geoid_free2mean: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Geoid Free-to-Mean conversion units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Value to convert segment geoid heights from the mean-tide system to the tide-free system. Subtract this value from mean-tide system segment_geoid (on ATL13) to get geoid heights in the tide-free system. Applicable value at reporting location for all short segment statistics. origname: segment_geoid_free2mean fullnamepath: /gt3l/segment_geoid_free2mean coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_qf_spec_width: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Spectral width Flag units: 1 source: ATL13 ATBD, Section 4.8.8 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Spectral moments width flag. The flag is set as follows: 0 when spec_width is invalid; 1 when 0 <= spec_width <= 0.2; 2 when 0.2 < spec_width <= 0.3; 3 when 0.3 < spec_width <= 0.4; 4 when 0.4 < spec_width <= 0.5; 5 when 0.5 < spec_width <= 0.6; 6 when 0.6 < spec_width <= 0.7; 7 when 0.7 < spec_width <= 0.8; 8 when 0.8 < spec_width <= 0.9; 9 when 0.9 < spec_width. flag_meanings: invalid 0<=spec_width<=0.2 0.2 origname: qf_spec_width fullnamepath: /gt3l/qf_spec_width coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_qf_bckgrd: | Array of 16 bit Integers [gt3l_delta_time = 0..221604] _FillValue: 127 long_name: Background Quality Flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 6 contentType: qualityInformation description: Describes the degree of background photons present in each short segment. bckgrd_dnsty_threshold1= 0.001 (counts per bi per Lseg); bckgrd_dnsty_threshold2= 0.01 (counts per bin per Lseg); bckgrd_dnsty_threshold3= 0.05 (counts per bin per Lseg); bckgrd_dnsty_threshold4= 0.1 (counts per bin per Lseg); bckgrd_dnsty_threshold5= 0.3 (counts per bin per Lseg); bckgrd_dnsty_threshold6= 0.5 (counts per bin per Lseg) flag_meanings: equal_to_or_below_threshold1 equal_to_or_below_threshold2 equal_to_or_below_threshold3 equal_to_or_below_threshold4 equal_to_or_below_threshold5 equal_to_or_below_threshold6 above_threshold6 flag_values: 0, 1, 2, 3, 4, 5, 6 origname: qf_bckgrd fullnamepath: /gt3l/qf_bckgrd coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_sseg_mean_time: | Array of 64 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 1.7976931348623157e+308 long_name: Mean time standard_name: time units: Seconds since 2018-01-01 source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Mean time of the signal-qualified photons in a short segment. origname: sseg_mean_time fullnamepath: /gt3l/sseg_mean_time coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_met_ts_atl09: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Surface temperature standard_name: temperature units: K source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Surface (skin) temperature from ATL09. origname: met_ts_atl09 fullnamepath: /gt3l/met_ts_atl09 coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_bias_em: | Array of 64 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 1.7976931348623157e+308 long_name: Electromagnetic bias units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Electromagnetic bias. (Has been applied to ht_ortho and _ht_water_surf products) origname: segment_bias_em fullnamepath: /gt3l/segment_bias_em coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_dem_ht: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: DEM Height units: meters source: ATL13 ATBD, Section 5.3.5 contentType: referenceInformation description: DEM height relative to WGS-84 ellipsoid, reported at the short segment rate. origname: segment_dem_ht fullnamepath: /gt3l/segment_dem_ht coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_subsurface_backscat_ampltd: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Subsurface backscatter amplitude units: 1 source: Section 5.3.4 (A) contentType: modelResult description: Subsurface backscatter amplitude, described in section 4.5.3, reported per long segment (default length = 10 short segments = approximately 1000 signal photons). origname: subsurface_backscat_ampltd fullnamepath: /gt3l/subsurface_backscat_ampltd coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt3l_segment_dac: | Array of 32 bit Reals [gt3l_delta_time = 0..221604] _FillValue: 3.402823466e+38 long_name: Segment DAC units: meters source: ATBD Section 5.3.5A contentType: auxiliaryInformation description: Dynamic atmospheric correction (DAC) includes inverted barometer (IB) effect (+- 5 cm). Although available at short segment rate for all water body types, value is provided mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_dac fullnamepath: /gt3l/segment_dac coordinates: gt3l_delta_time gt3l_segment_lat gt3l_segment_lon |
| gt2l_rgt: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] long_name: Reference Ground track units: 1 source: ATL03 valid_min: 1 valid_max: 1387 contentType: referenceInformation 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 1,387 RGTs. origname: rgt fullnamepath: /gt2l/rgt coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_azimuth: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Azimuth standard_name: azimuth units: radians source: ATL13 ATBD, Section 5.3.5 (A) contentType: auxiliaryInformation description: The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees. origname: segment_azimuth fullnamepath: /gt2l/segment_azimuth coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_qf_bias_fit: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Height Bias Fit Quality Flag units: 1 source: Inland Water ATBD valid_min: -3 valid_max: 4 contentType: qualityInformation description: The height bias fit flag is set based on the value of the goodness of fit bias estimated as the difference between the centroid elevations of the observed surface water histogram and fitted integrated water surface model histogram. The flag values are set as follows: = -3 if H_bias_fit < -0.10 (m); -2 if -0.10 <= H_bias_fit < -0.05;-1 when -0.05 <= H_bias_fit < -0.01; 0 if -0.01 <= H_bias_fit < 0.01 (m); 1 if 0.01 <= H_bias_fit < 0.05; 2 if 0.05 < H_bias_fit < 0.10; 3 if 0.10 <= H_bias_fit; 4 if H_bias_fit is invalid. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 equal_to_or_above_threshold6 invalid flag_values: -3, -2, -1, 0, 1, 2, 3, 4 origname: qf_bias_fit fullnamepath: /gt2l/qf_bias_fit coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_sseg_mean_lon: | Array of 64 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 1.7976931348623157e+308 long_name: Mean longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Mean longitude of the signal-qualified photons in a short segment. origname: sseg_mean_lon fullnamepath: /gt2l/sseg_mean_lon coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_cloud_flag_atm_atl09: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Cloud Flag Atm units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 10 contentType: modelResult description: Cloud flag from backscatter profile. origname: cloud_flag_atm_atl09 fullnamepath: /gt2l/cloud_flag_atm_atl09 coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_qf_ice: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Ice Quality Flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 3 contentType: qualityInformation description: The quality flag for ice describes the likelihood of ice on the short water body surface segment. 0 for QF_Bckgrd<= 2; 1 for 2 < QF_Bckgrd<= 4; 2 for 4 < QF_Bckgrd; 3 for (4 < QF_Bckgrd and QF_Cloud=1) flag_meanings: qf_bckgrd_le_2 qf_bckgrd_le_4 qf_bckgrd_gt_4 qf_bckgrd_w_cloud flag_values: 0, 1, 2, 3 origname: qf_ice fullnamepath: /gt2l/qf_ice coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_transect_id: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Transect ID units: 1 source: ATL13 ATBD, Section 5.3.2 (C) contentType: referenceInformation description: Transect within a water body to which the short segment rate output belongs. origname: transect_id fullnamepath: /gt2l/transect_id coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_inland_water_body_type: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Body type units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 1 valid_max: 9 contentType: referenceInformation description: Type of Inland Water Body, where 1=Lake, 2=Known Reservoir, 3=(Reserved for future use), 4=Ephemeral Water, 5=River, 6=Estuary or Bay, 7=Coastal Water, 8=Reserved, 9=Reserved flag_meanings: Lake Known_Reservoir Reserved_for_future_use Ephemeral_Water River Estuary_or_Bay Coastal_Water Reserved Reserved flag_values: 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_type fullnamepath: /gt2l/inland_water_body_type coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_inland_water_body_id: | Array of 32 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 2147483647 long_name: Body ID units: 1 source: ATL13 ATBD, Section 5.3.1 (C) contentType: referenceInformation description: Identifying signature of an individual inland water body. Each body of water is represented by a unique numeric value. origname: inland_water_body_id fullnamepath: /gt2l/inland_water_body_id coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_sseg_end_lon: | Array of 64 bit Reals [gt2l_delta_time = 0..191958] long_name: End longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude at which the short segment ends. May be a signal or non-signal photon. origname: sseg_end_lon fullnamepath: /gt2l/sseg_end_lon coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_qf_subsurface_attenuation: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Subsurface attenuation quality flag units: 1 source: ATL13 ATBD, Section 5.3.4 (A) valid_min: -2 valid_max: 2 contentType: qualityInformation description: Quality flag indicating whether or not the reported subsurface attenuation was constrained during deconvolution by the minimum (initial) limit in the possible range (QF=-1), the maximum limit in the possible range (QF = 1), or was allowed to settle on a solution within the possible range (QF=0). For analysis prior to deconvolution of the subsurface attenuation fit to the observations, the flag indicates whether the value determined by attempting to fit the observations was below (QF= -2), above (QF= 2), or within (QF=0) the possible range of expected values. When the default value for subsurface attenuation is chosen due to any condition other than those defined by an existing quality flag, QF=invalid. flag_meanings: obs_fit_below_range initial_limit within_range maximum_limit obs_fit_above_range flag_values: -2, -1, 0, 1, 2 origname: qf_subsurface_attenuation fullnamepath: /gt2l/qf_subsurface_attenuation coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_quality: | Array of 32 bit Integers [gt2l_delta_time = 0..191958][ds_sseg_quality = 0..3] _FillValue: 2147483647 long_name: Segment quality group count units: 1 source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Four-element array of describing, for each short segment n, the count of photons qualifying in each quality group. (n,1) = nominal, (n,2) = possible afterpulse, (n,3) = possible impulse response effect, (n,4) = possible TEP origname: segment_quality fullnamepath: /gt2l/segment_quality coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_geoid: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Segment Geoid units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Applicable mean-tide system geoid value at reporting location for all short segment statistics. (see geoid_free2mean to convert to the tide-free system.) origname: segment_geoid fullnamepath: /gt2l/segment_geoid coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_qf_sseg_length: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Short Segment Length flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 9 contentType: qualityInformation description: Length of short segments flag. The flag is set as follows: 0 if sseg_length < 10 (meters); 1 if 10 <= sseg_length < 20 (meters); 2 if 20 <= sseg_length < 30 (meters); 3 if 30 <= sseg_length < 50 (meters); 4 if 50 <= sseg_length < 75 (meters); 5 if 75 <= sseg_length < 100 (meters); 6 if 100 <= sseg_length < 150 (meters); 7 if 150 <= sseg_length < 200 (meters); 8 if 200 <= sseg_length < 300 (meters); 9 if 300 <= sseg_length. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 below_threshold7 below_threshold8 below_threshold9 equal_to_or_above_threshold9 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_sseg_length fullnamepath: /gt2l/qf_sseg_length coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_sseg_start_lon: | Array of 64 bit Reals [gt2l_delta_time = 0..191958] long_name: Start longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude at which the short segment begins. May be a signal or non-signal photon. origname: sseg_start_lon fullnamepath: /gt2l/sseg_start_lon coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_tide_equilibrium: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Segment Tide Equilibrium units: meters source: ATL03 contentType: auxiliaryInformation description: Long period equilibrium tide self-consistent with ocean tide model (+- 0.04 m). Although available at short segment rate for all water body types, value is provide mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_tide_equilibrium fullnamepath: /gt2l/segment_tide_equilibrium coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_qf_lseg_length: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Long Segment Length flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 3 contentType: qualityInformation description: The Long Segment Length flag is set based on the length of the long segment. The flag is set as follows: 0 if Lseg_length < 500 (meters); 1 if 50 <= Lseg_length < 1500 (meters); 2 if 150 <= Lseg_length < 3000 (meters); 3 if 3000 <= Lseg_length flag_meanings: below_threshold1 below_threshold2 below_threshold3 above_threshold4 flag_values: 0, 1, 2, 3 origname: qf_lseg_length fullnamepath: /gt2l/qf_lseg_length coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_significant_wave_ht: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: SWH units: meters source: section 5.3.3 (C) contentType: physicalMeasurement description: Significant wave height origname: significant_wave_ht fullnamepath: /gt2l/significant_wave_ht coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_bottom_lat: | Array of 64 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 1.7976931348623157e+308 long_name: Bottom latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of actual bottom location, based on the apparent bottom sseg_mean_lat / sseg_mean_lon location corrected for refraction effects. origname: bottom_lat fullnamepath: /gt2l/bottom_lat coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_cycle_number: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] long_name: Cycle Number units: counts source: ATL03 valid_min: 0 valid_max: 50 contentType: referenceInformation 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 1,387 and adding the RGT value. origname: cycle_number fullnamepath: /gt2l/cycle_number coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_qf_subsurface_backscat_ampltd: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Subsurface backscatter amplitude quality flag units: 1 source: ATL13 ATBD, Section 5.3.4 (A) valid_min: -2 valid_max: 2 contentType: qualityInformation description: Quality flag indicating whether or not the reported subsurface backscatter amplitude was constrained during deconvolution by the minimum limit in the possible range (QF=-1), the maximum limit in the possible range (QF = 1), or was allowed to settle on a solution within the possible range (QF=0). For analysis prior to deconvolution of the backscatter amplitude fit to the observations, the flag indicates whether the value determined by attempting to fit the observations was below (QF= -2), above (QF= 2), or within (QF=0) the possible range of expected values. When the default value for backscatter amplitude is chosen due to any condition other than those defined by an existing quality flag, QF=invalid. flag_meanings: obs_fit_below_range initial_limit within_range maximum_limit obs_fit_above_range flag_values: -2, -1, 0, 1, 2 origname: qf_subsurface_backscat_ampltd fullnamepath: /gt2l/qf_subsurface_backscat_ampltd coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_water_depth: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Water depth units: meters source: ATL13 ATBD, Section 5.3.4 (A) contentType: referenceInformation description: Depth from the mean water surface to detected bottom. origname: water_depth fullnamepath: /gt2l/water_depth coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_qf_bias_em: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: EM Bias Quality Flag units: 1 source: Inland Water ATBD valid_min: -3 valid_max: 4 contentType: qualityInformation description: The Electromagnetic Bias flag is set based on threshold checks for the estimated electromagnetic height bias. The flag is set as follows: -3 if H_bias_EM < -0.10 (m); -2 if -0.10 < H_bias_EM < -0.05; -1 if -0.05 <= H_bias_EM < -0.01; 0 if -0.01 <= H_bias_EM < 0.01 (m); 1 if 0.01 <= H_bias_EM < 0.05; 2 if 0.05 <= H_bias_EM < 0.10; 3 if 0.10 < H_bias_EM; 4 if H_bias_EM is invalid. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 above_threshold6 invalid flag_values: -3, -2, -1, 0, 1, 2, 3, 4 origname: qf_bias_em fullnamepath: /gt2l/qf_bias_em coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_id_end: | Array of 32 bit Integers [gt2l_delta_time = 0..191958] long_name: Last ATL03 Segment ID units: 1 source: ATL03 contentType: referenceInformation description: Last ATL03 segment_id associated with the photons within this inland water segment. origname: segment_id_end fullnamepath: /gt2l/segment_id_end coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_qf_stdev_vlseg: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: observed standard deviation quality flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Quality flag indicating the magnitude of standard deviation (SD) of observed detrended heights of the very long segment to which the short segment belongs, where 0: SD < 0.5 (meters), 1: 0.5 <= SD < 1.5, 2: 1.5 <= SD < 2.5, 3: 2.5 <= SD < 3.5, 4: 3.5 <= SD < 4.5, 5: 4.5 <= SD < 5.5, 6: 5.5 <= SD < 6.5, 7: 6.5 <= SD < 7.5, 8: 7.5 <= SD < 8.5, 9: 8.5 <= SD. It is recommended that a user consider this flag in conjunction with the water body type and size to best determine if the observed surface standard deviation is reasonable or whether results should be considered questionable. flag_meanings: SD_below_0.5 SD_below_1.5 SD_below_2.5 SD_below_3.5 SD_below_4.5 SD_below_5.5 SD_below_6.5 SD_below_7.5 SD_below_8.5 SD_greater_or_equal_to_8.5 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_stdev_vlseg fullnamepath: /gt2l/qf_stdev_vlseg coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_apparent_ht: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Apparent height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Apparent height of the short segment, before adjustments are made by the algorithm, based on an average of heights within a designated range of the short segment mode. origname: segment_apparent_ht fullnamepath: /gt2l/segment_apparent_ht coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_stdev_water_surf: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Surface StDev units: meters source: section 5.3.3 (C) contentType: referenceInformation description: Standard deviation of water surface, calculated over long segments with result reported at each short segment location tag contained within. origname: stdev_water_surf fullnamepath: /gt2l/stdev_water_surf coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_met_wind10_atl09: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Wind speed magnitude at 10m standard_name: Wind speed units: m/s source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Wind speed magnitude at 10m height from ATL09 input. origname: met_wind10_atl09 fullnamepath: /gt2l/met_wind10_atl09 coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_qf_iwp: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Inland Water Segment Processing Flag units: 1 source: Inland Water ATBD valid_min: 1 valid_max: 7 contentType: qualityInformation description: Describes the level of processing the inland water algorithm was able to perform based on the data available, ranging from one to 7. flag_meanings: 1_short_segment 2_short_segments 3_to_5_short_segments 6_to_7_short_segments 8_to_9_short_segments 10_to_29_short_segments at_least_30_short_segments flag_values: 1, 2, 3, 4, 5, 6, 7 origname: qf_iwp fullnamepath: /gt2l/qf_iwp coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_anom_ssegs_rgt: | Array of 16 bit Integers [gt2l_anom_ssegs_anom_sseg_time = 0..60820] long_name: Reference Ground track units: 1 source: ATL03 valid_min: 1 valid_max: 1387 contentType: referenceInformation 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 1,387 RGTs. origname: rgt fullnamepath: /gt2l/anom_ssegs/rgt coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lat gt2l_anom_ssegs_anom_sseg_lon |
| gt2l_anom_ssegs_anom_sseg_trigger_flag: | Array of 16 bit Integers [gt2l_anom_ssegs_anom_sseg_time = 0..60820][ds_anom_trigger = 0..8] _FillValue: 127 long_name: Anomalous classification flag units: 1 source: ATL13 ATBD, Table 5-4b valid_min: 0 valid_max: 1 contentType: qualityInformation description: Nine element array describing justification for short segment classification as anomalous, where for each element 0 = not triggered as anomalous and 1 = triggered as anomalous due to any of the following causes: [element 1=coarse ht difference, element 2=abnormal length, element 3= histogram mode spread, element 4=histogram mode count, element 5=histogram mode intensity, element 6=invalid long segment, element 7=shore buffer designation, element 8=insufficient signal phs, element 9=transect coarse water height unavailable against which to test short segment height] flag_meanings: not_triggered_as_anomalous triggered_as_anomalous flag_values: 0, 1 origname: anom_sseg_trigger_flag fullnamepath: /gt2l/anom_ssegs/anom_sseg_trigger_flag coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lat gt2l_anom_ssegs_anom_sseg_lon |
| gt2l_anom_ssegs_anom_sseg_quality: | Array of 32 bit Integers [gt2l_anom_ssegs_anom_sseg_time = 0..60820][ds_sseg_quality = 0..3] long_name: Segment quality group count units: 1 source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Four-element array of describing, for each anomalous short segment n, the count of photons qualifying in each quality group. (n,1) = nominal, (n,2) = possible afterpulse, (n,3) = possible impulse response effect, (n,4) = possible TEP _FillValue: 2147483647 origname: anom_sseg_quality fullnamepath: /gt2l/anom_ssegs/anom_sseg_quality coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lat gt2l_anom_ssegs_anom_sseg_lon |
| gt2l_anom_ssegs_transect_id: | Array of 16 bit Integers [gt2l_anom_ssegs_anom_sseg_time = 0..60820] _FillValue: 127 long_name: Transect ID units: 1 source: ATL13 ATBD, Section 5.3.2 (C) contentType: referenceInformation description: Transect within a water body to which the short segment rate output belongs. origname: transect_id fullnamepath: /gt2l/anom_ssegs/transect_id coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lat gt2l_anom_ssegs_anom_sseg_lon |
| gt2l_anom_ssegs_cycle_number: | Array of 16 bit Integers [gt2l_anom_ssegs_anom_sseg_time = 0..60820] long_name: Cycle Number units: counts source: ATL03 valid_min: 0 valid_max: 50 contentType: referenceInformation 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 1,387 and adding the RGT value. origname: cycle_number fullnamepath: /gt2l/anom_ssegs/cycle_number coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lat gt2l_anom_ssegs_anom_sseg_lon |
| gt2l_anom_ssegs_anom_sseg_lat: | Array of 64 bit Reals [gt2l_anom_ssegs_anom_sseg_time = 0..60820] long_name: Latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of the short segment (mean of signal class >=2 ph Lats). origname: anom_sseg_lat fullnamepath: /gt2l/anom_ssegs/anom_sseg_lat coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lon |
| gt2l_anom_ssegs_anom_sseg_stdev: | Array of 32 bit Reals [gt2l_anom_ssegs_anom_sseg_time = 0..60820] _FillValue: 3.402823466e+38 long_name: Segment standard deviation units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Standard deviation of anomalous short segment photon height in the anomalous short segment with signal classification >=2. origname: anom_sseg_stdev fullnamepath: /gt2l/anom_ssegs/anom_sseg_stdev coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lat gt2l_anom_ssegs_anom_sseg_lon |
| gt2l_anom_ssegs_anom_sseg_ht_delta: | Array of 32 bit Reals [gt2l_anom_ssegs_anom_sseg_time = 0..60820] _FillValue: 3.402823466e+38 long_name: Height difference units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Height difference between anom_sseg_mode of the anomalous short segment and the transect coarse_transect_ht. origname: anom_sseg_ht_delta fullnamepath: /gt2l/anom_ssegs/anom_sseg_ht_delta coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lat gt2l_anom_ssegs_anom_sseg_lon |
| gt2l_anom_ssegs_anom_sseg_length: | Array of 64 bit Reals [gt2l_anom_ssegs_anom_sseg_time = 0..60820] _FillValue: 1.7976931348623157e+308 long_name: Segment length units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Length of the short segment, based on end points computed by the average of sseg_endpoint_avg_n signal photons. origname: anom_sseg_length fullnamepath: /gt2l/anom_ssegs/anom_sseg_length coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lat gt2l_anom_ssegs_anom_sseg_lon |
| gt2l_anom_ssegs_anom_sseg_end_lon: | Array of 64 bit Reals [gt2l_anom_ssegs_anom_sseg_time = 0..60820] long_name: End longitude standard_name: longitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: End longitude of the anomalous short segment, based on the average longitude of the last sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_end_lon fullnamepath: /gt2l/anom_ssegs/anom_sseg_end_lon coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lat gt2l_anom_ssegs_anom_sseg_lon |
| gt2l_anom_ssegs_coarse_transect_ht: | Array of 32 bit Reals [gt2l_anom_ssegs_anom_sseg_time = 0..60820] _FillValue: 3.402823466e+38 long_name: Coarse water height units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Coarse water height of transect. origname: coarse_transect_ht fullnamepath: /gt2l/anom_ssegs/coarse_transect_ht coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lat gt2l_anom_ssegs_anom_sseg_lon |
| gt2l_anom_ssegs_anom_sseg_mode: | Array of 32 bit Reals [gt2l_anom_ssegs_anom_sseg_time = 0..60820] _FillValue: 3.402823466e+38 long_name: Anomalous mode bin height units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Height of anomalous short segment as determined by histogram bin mode. origname: anom_sseg_mode fullnamepath: /gt2l/anom_ssegs/anom_sseg_mode coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lat gt2l_anom_ssegs_anom_sseg_lon |
| gt2l_anom_ssegs_anom_sseg_lon: | Array of 64 bit Reals [gt2l_anom_ssegs_anom_sseg_time = 0..60820] long_name: Longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of the short segment (mean of signal class >=2 ph Lons). origname: anom_sseg_lon fullnamepath: /gt2l/anom_ssegs/anom_sseg_lon coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lat |
| gt2l_anom_ssegs_anom_sseg_start_lon: | Array of 64 bit Reals [gt2l_anom_ssegs_anom_sseg_time = 0..60820] long_name: Start longitude standard_name: longitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Start longitude of the anomalous short segment, based on the average longitude of the first sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_start_lon fullnamepath: /gt2l/anom_ssegs/anom_sseg_start_lon coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lat gt2l_anom_ssegs_anom_sseg_lon |
| gt2l_anom_ssegs_anom_sseg_mean_ht_ortho: | Array of 32 bit Reals [gt2l_anom_ssegs_anom_sseg_time = 0..60820] _FillValue: 3.402823466e+38 long_name: Orthometric Height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Orthometric height of anomalous short segment as determined by the mean of photon orthometric heights in the anomalous short segment with signal classification >2 origname: anom_sseg_mean_ht_ortho fullnamepath: /gt2l/anom_ssegs/anom_sseg_mean_ht_ortho coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lat gt2l_anom_ssegs_anom_sseg_lon |
| gt2l_anom_ssegs_anom_sseg_start_lat: | Array of 64 bit Reals [gt2l_anom_ssegs_anom_sseg_time = 0..60820] long_name: Start latitude standard_name: latitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Start latitude of the anomalous short segment, based on the average latitude of the first sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_start_lat fullnamepath: /gt2l/anom_ssegs/anom_sseg_start_lat coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lat gt2l_anom_ssegs_anom_sseg_lon |
| gt2l_anom_ssegs_anom_sseg_end_lat: | Array of 64 bit Reals [gt2l_anom_ssegs_anom_sseg_time = 0..60820] long_name: End latitude standard_name: latitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: End latitude of the anomalous short segment, based on the average latitude of the last sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_end_lat fullnamepath: /gt2l/anom_ssegs/anom_sseg_end_lat coordinates: gt2l_anom_ssegs_anom_sseg_time gt2l_anom_ssegs_anom_sseg_lat gt2l_anom_ssegs_anom_sseg_lon |
| gt2l_segment_podppd_flag: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 0 long_name: POD_PPD Flag units: 1 source: ATL02, ANC04, ANC05 valid_min: 0 valid_max: 7 contentType: referenceInformation description: Composite POD/PPD flag that indicates the quality of input geolocation products for the utilized ATL03 segments on an ATL13 short segment output basis. A non-zero value may indicate that geolocation solutions are degraded or that ATLAS is within a calibration scan period (CAL). The ATL03 sigma values should indicate the degree of uncertainty associated with the degradation. Possible non-CAL values are: 0=NOMINAL; 1=POD_DEGRADE; 2=PPD_DEGRADE; 3=PODPPD_DEGRADE; possible CAL values are: 4=CAL_NOMINAL; 5=CAL_POD_DEGRADE; 6=CAL_PPD_DEGRADE; 7=CAL_PODPPD_DEGRADE; flag_meanings: nominal pod_degrade ppd_degrade podppd_degrade cal_nominal cal_pod_degrade cal_ppd_degrade cal_podppd_degrade flag_values: 0, 1, 2, 3, 4, 5, 6, 7 origname: segment_podppd_flag fullnamepath: /gt2l/segment_podppd_flag coordinates: gt2l_delta_time |
| gt2l_qf_ht_adj: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Height adjustment Quality Flag units: 1 source: ATL13 ATBD, Section 5.3.5 (C) valid_min: -4 valid_max: 5 contentType: qualityInformation description: Flag representing the range of height, defined in 5.3.5 (C), which has been added to the apparent surface height due to frame of reference scaling during deconvolution analysis. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 below_threshold7 below_threshold8 equal_to_or_above_threshold8 invalid flag_values: -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 origname: qf_ht_adj fullnamepath: /gt2l/qf_ht_adj coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_full_sat_fract: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Full Saturation Fraction units: 1 source: ATL13 ATBD, Section 5.2 valid_min: 0.000000000 valid_max: 1.000000000 contentType: qualityInformation description: The fraction of pulses within the short segment determined to be fully saturated based on ATL03 geosegment rate input. origname: segment_full_sat_fract fullnamepath: /gt2l/segment_full_sat_fract coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_id_beg: | Array of 32 bit Integers [gt2l_delta_time = 0..191958] long_name: First ATL03 Segment ID units: 1 source: ATL03 contentType: referenceInformation description: First ATL03 segment_id associated with the photons within this inland water segment. origname: segment_id_beg fullnamepath: /gt2l/segment_id_beg coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_qf_subsurf_anomaly: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] units: 1 source: Inland Water ATBD 5.3.4(A) valid_min: 1 valid_max: 3 contentType: qualityInformation description: Describes the likelihood that the bottom or other subsurface anomaly is bottom based on the threshold value at which an anomaly was found. 1 = Subsurface anomaly due to bottom likely; 2 = Subsurface signal may indicate bottom or other anomaly; 3 = Possible subsurface anomaly; invalid = No subsurface anomaly detected flag_meanings: bottom_likely bottom_or_other_anomaly possible_subsurface_anomaly flag_values: 1, 2, 3 _FillValue: 127 long_name: Subsurface Anomaly Quality Flag origname: qf_subsurf_anomaly fullnamepath: /gt2l/qf_subsurf_anomaly coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_subsurface_attenuation: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Subsurface Attenuation units: m^-1 source: Section 5.3.4 (A) contentType: physicalMeasurement description: Subsurface attenuation coefficient. origname: subsurface_attenuation fullnamepath: /gt2l/subsurface_attenuation coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_layer_flag_atl09: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Consolidated cloud flag units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 1 contentType: qualityInformation description: Consolidated cloud flag. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 origname: layer_flag_atl09 fullnamepath: /gt2l/layer_flag_atl09 coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_inland_water_body_region: | Array of 32 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 2147483647 long_name: Body region units: 1 source: ATL13 ATBD, Section 5.3.1 (A) contentType: referenceInformation description: ATL13-created shapefile representing relevant bodies of water over which to implement the ATL13 water surface finding algorithm only within a region of processing interest. origname: inland_water_body_region fullnamepath: /gt2l/inland_water_body_region coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_sseg_end_lat: | Array of 64 bit Reals [gt2l_delta_time = 0..191958] long_name: End latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Latitude at which the short segment ends. May be a signal or non-signal photon. origname: sseg_end_lat fullnamepath: /gt2l/sseg_end_lat coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_cloud_flag_asr_atl09: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Cloud Flag ASR units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 5 contentType: modelResult description: Cloud probability from ASR. flag_meanings: clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence flag_values: 0, 1, 2, 3, 4, 5 origname: cloud_flag_asr_atl09 fullnamepath: /gt2l/cloud_flag_asr_atl09 coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_ice_flag: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Ice Flag units: 1 source: ATL13 ATBD, section 5.2 valid_min: 0 valid_max: 1 contentType: qualityInformation description: Describes likelihood of ice on water surface short segment. flag_meanings: no_ice ice flag_values: 0, 1 origname: ice_flag fullnamepath: /gt2l/ice_flag coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_sseg_start_lat: | Array of 64 bit Reals [gt2l_delta_time = 0..191958] long_name: Start latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude at which the short segment begins. May be a signal or non-signal photon. origname: sseg_start_lat fullnamepath: /gt2l/sseg_start_lat coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_ref_elev: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: elevation standard_name: elevation units: radians source: ATL13 ATBD, Section 5.3.5 (A) contentType: auxiliaryInformation 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. origname: segment_ref_elev fullnamepath: /gt2l/segment_ref_elev coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_lon: | Array of 64 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 1.7976931348623157e+308 long_name: Longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of reporting location for all short segment statistics. origname: segment_lon fullnamepath: /gt2l/segment_lon coordinates: gt2l_delta_time gt2l_segment_lat |
| gt2l_ht_ortho: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Orthometric Height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Orthometric height EGM2008 converted from ellipsoidal height. origname: ht_ortho fullnamepath: /gt2l/ht_ortho coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_lat: | Array of 64 bit Reals [gt2l_delta_time = 0..191958] long_name: Latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of reporting location for all short segment statistics. origname: segment_lat fullnamepath: /gt2l/segment_lat coordinates: gt2l_delta_time gt2l_segment_lon |
| gt2l_ht_water_surf: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Water surface height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Water surface height, reported for each short segment (default length = approximately 100 signal photons) with reference to WGS84 ellipsoid origname: ht_water_surf fullnamepath: /gt2l/ht_water_surf coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_near_sat_fract: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Near Saturation Fraction units: 1 source: ATL13 ATBD, Section 5.2 valid_min: 0.000000000 valid_max: 1.000000000 contentType: qualityInformation description: The fraction of pulses within the short segment determined to be nearly saturated based on ATL03 geosegment rate input. origname: segment_near_sat_fract fullnamepath: /gt2l/segment_near_sat_fract coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_err_ht_water_surf: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Height Error units: 1 source: section 5.3.3 (C) contentType: qualityInformation description: Error included in heights reported in ht_water_surf. origname: err_ht_water_surf fullnamepath: /gt2l/err_ht_water_surf coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_bottom_lon: | Array of 64 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 1.7976931348623157e+308 long_name: Mean longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of actual bottom location, based on the apparent bottom sseg_mean_lat / sseg_mean_lon location corrected for refraction effects. origname: bottom_lon fullnamepath: /gt2l/bottom_lon coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_bias_fit: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Goodness of fit bias units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Bias contribution from goodness of observation/system response fit. (Has been applied to ht_ortho and _ht_water_surf products) origname: segment_bias_fit fullnamepath: /gt2l/segment_bias_fit coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_qf_cloud: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Consolidated cloud flag units: 1 source: ATL09 valid_min: 0 valid_max: 1 contentType: qualityInformation description: This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow. From the ATL09 data closest to the segment time. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 origname: qf_cloud fullnamepath: /gt2l/qf_cloud coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_inland_water_body_source: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Body source units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 1 valid_max: 9 contentType: referenceInformation description: Source of Inland Water Body shape, where 1=HydroLAKES, 2=Global Lakes and Wetlands Database, 3=Named Marine Water Bodies, 4=GSHHG Shoreline, 5=Global River Widths from Landsat, 6=Reserved, 7=Reserved, 8=Reserved, 9=Reserved flag_meanings: HydroLAKES Global_Lakes_and_Wetlands_Database Named_Marine_Water_Bodies GSHHG_Shoreline Global_River_Widths_from_Landsat Reserved Reserved Reserved Reserved flag_values: 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_source fullnamepath: /gt2l/inland_water_body_source coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_tide_earth_free2mean: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Earth Tide Free-to-Mean conversion units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Segment rate value to convert solid earth tide from the tide-free system that was applied in ATL03 to photon heights to the ht_water_surf to the mean-tide system. Subtract value from ht_water_surf to reference it in the mean-tide system. Applicable value at reporting location for all short segment statistics. origname: segment_tide_earth_free2mean fullnamepath: /gt2l/segment_tide_earth_free2mean coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_qf_stdev_lseg: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: observed standard deviation quality flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Quality flag indicating the magnitude of standard deviation (SD) of observed detrended heights of the long segment to which the short segment belongs, where 0: SD < 0.5 (meters), 1: 0.5 <= SD < 1.5, 2: 1.5 <= SD < 2.5, 3: 2.5 <= SD < 3.5, 4: 3.5 <= SD < 4.5, 5: 4.5 <= SD < 5.5, 6: 5.5 <= SD < 6.5, 7: 6.5 <= SD < 7.5, 8: 7.5 <= SD < 8.5, 9: 8.5 <= SD. It is recommended that a user consider this flag in conjunction with the water body type and size to best determine if the observed surface standard deviation is reasonable or whether results should be considered questionable. flag_meanings: SD_below_0.5 SD_below_1.5 SD_below_2.5 SD_below_3.5 SD_below_4.5 SD_below_5.5 SD_below_6.5 SD_below_7.5 SD_below_8.5 SD_greater_or_equal_to_8.5 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_stdev_lseg fullnamepath: /gt2l/qf_stdev_lseg coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_dem_source: | Array of 32 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 2147483647 long_name: dem source flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 4 contentType: referenceInformation description: Flag equal to the source of the selected photon (in hierarchy of Arctic/Global/MSS/Antarctic). Values: 0=None, 1=Arctic, 2=Global, 3=MSS, 4=Antarctic. flag_meanings: none arctic global mss antarctic flag_values: 0, 1, 2, 3, 4 origname: segment_dem_source fullnamepath: /gt2l/segment_dem_source coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_fpb_correction: | Array of 64 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 1.7976931348623157e+308 long_name: First photon bias correction units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: First photon bias correction. May be applied at user disrection by subtracting from mean height produts ht_ortho and ht_water_surf. origname: segment_fpb_correction fullnamepath: /gt2l/segment_fpb_correction coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_inland_water_body_size: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Body size units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 0 valid_max: 9 contentType: referenceInformation description: Size of Inland Water Body, A=area, where 0=Not_Assigned, 1=A>10,000 sq km, 2=10,000>A>=1,000, 3=1,000>A>=100, 4=100>A>=10, 5=10>A>=1, 6=1>A>=0.1, 7=0.01>A, 8=Reserved, 9=Reserved flag_meanings: not_assigned area_gt_10000 10000_gt_area_ge_1000 1000_gt_area_ge_100 100_gt_area_ge_10 10_gt_area_ge_1 1_gt_area_ge_0.1 0.01_gt_area Reserved Reserved flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_size fullnamepath: /gt2l/inland_water_body_size coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_met_wind10_atl13: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Wind speed magnitude at 10m standard_name: Wind speed units: m/s source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Wind speed magnitude at 10m height, based on derived water surface wave height. origname: met_wind10_atl13 fullnamepath: /gt2l/met_wind10_atl13 coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_snow_ice_atl09: | Array of 32 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 2147483647 long_name: Snow Ice Flag units: 1 source: ATL13 ATBD, Section 5.3.5 (A) contentType: modelResult description: NOAA snow/ice flag scaled by ATL09 (0=ice-free water, 1=snow-free land, 2=snow, 3=ice, 127=invalid) flag_meanings: ice_free_water snow_free_land snow ice invalid flag_values: 0, 1, 2, 3, 127 origname: snow_ice_atl09 fullnamepath: /gt2l/snow_ice_atl09 coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_tide_ocean: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Segment Tide Ocean units: meters source: ATL03 contentType: auxiliaryInformation description: Ocean tides including diurnal and semi-diurnal (harmonic analysis (+-4 m)). Although available at short segment rate for all water body types, value is provide mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_tide_ocean fullnamepath: /gt2l/segment_tide_ocean coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_err_slope_trk: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] units: 1 _FillValue: 3.402823466e+38 long_name: Slope Error source: section 5.3.3 (C) contentType: qualityInformation description: Error included in segment_slope_trk_local. origname: err_slope_trk fullnamepath: /gt2l/err_slope_trk coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_slope_trk_bdy: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Water Body Slope units: m/m source: ATL13 ATBD, Section 5.3.5 (A) contentType: physicalMeasurement description: Along track water body surface slope, reported per short segment ID per water body. origname: segment_slope_trk_bdy fullnamepath: /gt2l/segment_slope_trk_bdy coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_sseg_mean_lat: | Array of 64 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 1.7976931348623157e+308 long_name: Mean latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Mean latitude of the signal-qualified photons in a short segment. origname: sseg_mean_lat fullnamepath: /gt2l/sseg_mean_lat coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_geoid_free2mean: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Geoid Free-to-Mean conversion units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Value to convert segment geoid heights from the mean-tide system to the tide-free system. Subtract this value from mean-tide system segment_geoid (on ATL13) to get geoid heights in the tide-free system. Applicable value at reporting location for all short segment statistics. origname: segment_geoid_free2mean fullnamepath: /gt2l/segment_geoid_free2mean coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_qf_spec_width: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Spectral width Flag units: 1 source: ATL13 ATBD, Section 4.8.8 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Spectral moments width flag. The flag is set as follows: 0 when spec_width is invalid; 1 when 0 <= spec_width <= 0.2; 2 when 0.2 < spec_width <= 0.3; 3 when 0.3 < spec_width <= 0.4; 4 when 0.4 < spec_width <= 0.5; 5 when 0.5 < spec_width <= 0.6; 6 when 0.6 < spec_width <= 0.7; 7 when 0.7 < spec_width <= 0.8; 8 when 0.8 < spec_width <= 0.9; 9 when 0.9 < spec_width. flag_meanings: invalid 0<=spec_width<=0.2 0.2 origname: qf_spec_width fullnamepath: /gt2l/qf_spec_width coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_qf_bckgrd: | Array of 16 bit Integers [gt2l_delta_time = 0..191958] _FillValue: 127 long_name: Background Quality Flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 6 contentType: qualityInformation description: Describes the degree of background photons present in each short segment. bckgrd_dnsty_threshold1= 0.001 (counts per bi per Lseg); bckgrd_dnsty_threshold2= 0.01 (counts per bin per Lseg); bckgrd_dnsty_threshold3= 0.05 (counts per bin per Lseg); bckgrd_dnsty_threshold4= 0.1 (counts per bin per Lseg); bckgrd_dnsty_threshold5= 0.3 (counts per bin per Lseg); bckgrd_dnsty_threshold6= 0.5 (counts per bin per Lseg) flag_meanings: equal_to_or_below_threshold1 equal_to_or_below_threshold2 equal_to_or_below_threshold3 equal_to_or_below_threshold4 equal_to_or_below_threshold5 equal_to_or_below_threshold6 above_threshold6 flag_values: 0, 1, 2, 3, 4, 5, 6 origname: qf_bckgrd fullnamepath: /gt2l/qf_bckgrd coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_sseg_mean_time: | Array of 64 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 1.7976931348623157e+308 long_name: Mean time standard_name: time units: Seconds since 2018-01-01 source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Mean time of the signal-qualified photons in a short segment. origname: sseg_mean_time fullnamepath: /gt2l/sseg_mean_time coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_met_ts_atl09: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Surface temperature standard_name: temperature units: K source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Surface (skin) temperature from ATL09. origname: met_ts_atl09 fullnamepath: /gt2l/met_ts_atl09 coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_bias_em: | Array of 64 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 1.7976931348623157e+308 long_name: Electromagnetic bias units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Electromagnetic bias. (Has been applied to ht_ortho and _ht_water_surf products) origname: segment_bias_em fullnamepath: /gt2l/segment_bias_em coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_dem_ht: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: DEM Height units: meters source: ATL13 ATBD, Section 5.3.5 contentType: referenceInformation description: DEM height relative to WGS-84 ellipsoid, reported at the short segment rate. origname: segment_dem_ht fullnamepath: /gt2l/segment_dem_ht coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_subsurface_backscat_ampltd: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Subsurface backscatter amplitude units: 1 source: Section 5.3.4 (A) contentType: modelResult description: Subsurface backscatter amplitude, described in section 4.5.3, reported per long segment (default length = 10 short segments = approximately 1000 signal photons). origname: subsurface_backscat_ampltd fullnamepath: /gt2l/subsurface_backscat_ampltd coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| gt2l_segment_dac: | Array of 32 bit Reals [gt2l_delta_time = 0..191958] _FillValue: 3.402823466e+38 long_name: Segment DAC units: meters source: ATBD Section 5.3.5A contentType: auxiliaryInformation description: Dynamic atmospheric correction (DAC) includes inverted barometer (IB) effect (+- 5 cm). Although available at short segment rate for all water body types, value is provided mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_dac fullnamepath: /gt2l/segment_dac coordinates: gt2l_delta_time gt2l_segment_lat gt2l_segment_lon |
| ancillary_data_release: | Array of Strings [FakeDim0 = 0..0] long_name: Release Number units: 1 source: Operations contentType: auxiliaryInformation 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. origname: release fullnamepath: /ancillary_data/release |
| ancillary_data_end_geoseg: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Ending Geolocation Segment units: 1 source: Derived contentType: auxiliaryInformation 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. origname: end_geoseg fullnamepath: /ancillary_data/end_geoseg |
| ancillary_data_version: | Array of Strings [FakeDim0 = 0..0] long_name: Version units: 1 source: Operations contentType: auxiliaryInformation 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. origname: version fullnamepath: /ancillary_data/version |
| ancillary_data_end_region: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Ending Region units: 1 source: Derived contentType: auxiliaryInformation 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. origname: end_region fullnamepath: /ancillary_data/end_region |
| ancillary_data_atlas_sdp_gps_epoch: | Array of 64 bit Reals [FakeDim0 = 0..0] long_name: ATLAS Epoch Offset units: seconds since 1980-01-06T00:00:00.000000Z source: Operations contentType: auxiliaryInformation 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. origname: atlas_sdp_gps_epoch fullnamepath: /ancillary_data/atlas_sdp_gps_epoch |
| ancillary_data_end_rgt: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Ending Reference Groundtrack units: 1 source: Derived valid_min: 1 valid_max: 1387 contentType: auxiliaryInformation 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. origname: end_rgt fullnamepath: /ancillary_data/end_rgt |
| ancillary_data_end_delta_time: | Array of 64 bit Reals [FakeDim0 = 0..0] long_name: ATLAS End Time (Actual) standard_name: time units: seconds since 2018-01-01 source: Derived contentType: auxiliaryInformation 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. origname: end_delta_time fullnamepath: /ancillary_data/end_delta_time |
| ancillary_data_end_orbit: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Ending Orbit Number units: 1 source: Derived contentType: auxiliaryInformation 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. origname: end_orbit fullnamepath: /ancillary_data/end_orbit |
| ancillary_data_start_cycle: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Starting Cycle units: 1 source: Derived valid_min: 0 valid_max: 99 contentType: auxiliaryInformation 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. origname: start_cycle fullnamepath: /ancillary_data/start_cycle |
| ancillary_data_data_end_utc: | Array of Strings [FakeDim0 = 0..0] long_name: End UTC Time of Granule (CCSDS-A, Actual) units: 1 source: Derived contentType: auxiliaryInformation description: UTC (in CCSDS-A format) of the last data point within the granule. origname: data_end_utc fullnamepath: /ancillary_data/data_end_utc |
| ancillary_data_control: | Array of Strings [FakeDim0 = 0..0] long_name: Control File units: 1 source: Operations contentType: auxiliaryInformation description: PGE-specific control file used to generate this granule. To re-use, replace breaks (BR) with linefeeds. origname: control fullnamepath: /ancillary_data/control |
| ancillary_data_start_gpssow: | Array of 64 bit Reals [FakeDim0 = 0..0] long_name: Start GPS SOW of Granule (Actual) units: seconds source: Derived contentType: auxiliaryInformation description: GPS seconds-of-week of the first data point in the granule. origname: start_gpssow fullnamepath: /ancillary_data/start_gpssow |
| ancillary_data_granule_end_utc: | Array of Strings [FakeDim0 = 0..0] long_name: End UTC Time of Granule (CCSDS-A, Requested) units: 1 source: Derived contentType: auxiliaryInformation description: Requested end time (in UTC CCSDS-A) of this granule. origname: granule_end_utc fullnamepath: /ancillary_data/granule_end_utc |
| ancillary_data_end_cycle: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Ending Cycle units: 1 source: Derived valid_min: 0 valid_max: 99 contentType: auxiliaryInformation 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. origname: end_cycle fullnamepath: /ancillary_data/end_cycle |
| ancillary_data_granule_start_utc: | Array of Strings [FakeDim0 = 0..0] long_name: Start UTC Time of Granule (CCSDS-A, Requested) units: 1 source: Derived contentType: auxiliaryInformation description: Requested start time (in UTC CCSDS-A) of this granule. origname: granule_start_utc fullnamepath: /ancillary_data/granule_start_utc |
| ancillary_data_start_delta_time: | Array of 64 bit Reals [FakeDim0 = 0..0] long_name: ATLAS Start Time (Actual) standard_name: time units: seconds since 2018-01-01 source: Derived contentType: auxiliaryInformation 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. origname: start_delta_time fullnamepath: /ancillary_data/start_delta_time |
| ancillary_data_start_geoseg: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Starting Geolocation Segment units: 1 source: Derived contentType: auxiliaryInformation 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. origname: start_geoseg fullnamepath: /ancillary_data/start_geoseg |
| ancillary_data_inland_water_n_coarse_iter: | Array of 16 bit Integers [FakeDim1 = 0..8][FakeDim2 = 0..2] _FillValue: 127 long_name: Number of coarse iterations units: 1 source: ATBD Table 5-2 contentType: auxiliaryInformation description: Number of coarse iteration steps for amplitude, mean height and standard deviation for surface iterated convolution. origname: n_coarse_iter fullnamepath: /ancillary_data/inland_water/n_coarse_iter |
| ancillary_data_inland_water_atm_window2: | Array of 32 bit Reals [FakeDim0 = 0..0] long_name: ATM Background Window Top units: meters source: ATBD Table 5-2 contentType: auxiliaryInformation description: Upper limit of height above coarse water surface height for atmospheric background count calculation. origname: atm_window2 fullnamepath: /ancillary_data/inland_water/atm_window2 |
| ancillary_data_inland_water_b1_sseg1: | Array of 32 bit Reals [FakeDim0 = 0..0] long_name: Small Segment Bin Size units: meters source: ATBD Table 5-2 contentType: auxiliaryInformation description: Bin size to be used for histogramming of each small segment. origname: b1_sseg1 fullnamepath: /ancillary_data/inland_water/b1_sseg1 |
| ancillary_data_inland_water_s_seg1: | Array of 32 bit Integers [FakeDim1 = 0..8] _FillValue: 2147483647 long_name: Short Segment Length units: 1 source: ATBD Table 5-2 valid_min: 1 valid_max: 500 contentType: auxiliaryInformation description: Short segment size, indicating the number of along track signal photons per segment, operationally used as unit length over which to identify water surface height anomalies such as islands, bridges, etc. origname: s_seg1 fullnamepath: /ancillary_data/inland_water/s_seg1 |
| ancillary_data_inland_water_detrend_width: | Array of 32 bit Reals [FakeDim0 = 0..0] long_name: Detrend Width units: 1 source: ATBD Table 5-2 contentType: auxiliaryInformation description: Number of standard deviations +/- mode to include in detrend band. origname: detrend_width fullnamepath: /ancillary_data/inland_water/detrend_width |
| ancillary_data_inland_water_sub_max: | Array of 32 bit Reals [FakeDim0 = 0..0] long_name: Subsurf Max Vertical Profile units: meters source: ATBD Table 5-2 contentType: auxiliaryInformation description: Maximum vertical profile of water subsurface to include in estimation of subsurface characteristics origname: sub_max fullnamepath: /ancillary_data/inland_water/sub_max |
| ancillary_data_inland_water_lidar_coeff_alpha_unit_max: | Array of 32 bit Reals [FakeDim1 = 0..8][FakeDim3 = 0..1] long_name: Subsurface parameters units: 1 source: ATBD Table 5-2 contentType: auxiliaryInformation description: Coefficient multiplier of unit exponential distribution and subsurface alpha_unit maximum values of iteration loops used in deconvolution, described in section 5.3.4 (A), based on water body type. origname: lidar_coeff_alpha_unit_max fullnamepath: /ancillary_data/inland_water/lidar_coeff_alpha_unit_max |
| ancillary_data_inland_water_ref_dist_iw_bdy: | Array of 32 bit Reals [FakeDim0 = 0..0] long_name: Reference Difference units: meters source: ATBD Table 5-2 contentType: auxiliaryInformation description: Maximum distance from a water body that a geosegment reference photon indicates the need for overlap testing each individual photon in the geosegment origname: ref_dist_iw_bdy fullnamepath: /ancillary_data/inland_water/ref_dist_iw_bdy |
| ancillary_data_inland_water_geoseg_edge_buffer: | Array of 16 bit Integers [FakeDim1 = 0..8][FakeDim5 = 0..8] _FillValue: 127 long_name: geosegment edge buffer units: 1 source: ATL13 ATBD, Section 5.2, Table 5-2 valid_min: 0 valid_max: 5 contentType: auxiliaryInformation description: Number of geosegments to include in the water surface calculation that are outside of both water body edges, as identified by reference photon location comparison to water body shapes. flag_meanings: buffer_0 buffer_1 buffer_2 buffer_3 buffer_4 buffer_5 flag_values: 0, 1, 2, 3, 4, 5 origname: geoseg_edge_buffer fullnamepath: /ancillary_data/inland_water/geoseg_edge_buffer |
| ancillary_data_inland_water_sseg_mode_freq_test: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Short Segment Mode Frequency Test units: 1 source: ATBD Table 5-2 contentType: auxiliaryInformation description: Threshold to test number of short segment histogram modes against for inclusion or exclusion of short segment. origname: sseg_mode_freq_test fullnamepath: /ancillary_data/inland_water/sseg_mode_freq_test |
| ancillary_data_inland_water_type_to_process: | Array of 16 bit Integers [FakeDim1 = 0..8] _FillValue: 127 long_name: Type to Process units: 1 source: ATL13 ATBD, Section 4.7.1.2, Table 5-4 valid_min: 0 valid_max: 1 contentType: auxiliaryInformation description: Water body types that are to be processed by the ATL13 algorithm. This parameter is a rank 1 array of extent 9, with the body type digits coinciding with the array subscripts 1 through 9. Array elements are binary values, if 0 then process body type, 1 otherwise. Water body types are described in ATL13 chapter 4.7.1.2 and in Table 5-4. flag_meanings: process_type otherwise flag_values: 0, 1 origname: type_to_process fullnamepath: /ancillary_data/inland_water/type_to_process |
| ancillary_data_inland_water_sig_threshold: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Signal Confidence Threshold units: 1 source: ATBD Table 5-2 contentType: auxiliaryInformation description: Minimum signal confidence required for photon to be included in analysis origname: sig_threshold fullnamepath: /ancillary_data/inland_water/sig_threshold |
| ancillary_data_inland_water_size_to_process: | Array of 16 bit Integers [FakeDim1 = 0..8][FakeDim7 = 0..8] _FillValue: 127 long_name: Size to Process units: 1 source: ATL13 ATBD, Section 4.7.1.2, Table 5-4 valid_min: 0 valid_max: 1 contentType: auxiliaryInformation description: Water body sizes that are to be processed by the ATL13 algorithm for each water body type. This parameter is a rank 2 array of size 9x9, where array subscripts 1 through 9, coincide with body type digits along columns, and body size digits along rows. Array elements are binary values, if 0 then process body size for that type, 1 otherwise. Water body sizes are described in ATL13 chapter 4.7.1.2 and in Table 5-4. flag_meanings: process_size otherwise flag_values: 0, 1 origname: size_to_process fullnamepath: /ancillary_data/inland_water/size_to_process |
| ancillary_data_inland_water_lidar_coeff_alpha_unit_min: | Array of 32 bit Reals [FakeDim1 = 0..8][FakeDim3 = 0..1] long_name: Subsurface parameters units: 1 source: ATBD Table 5-2 contentType: auxiliaryInformation description: Coefficient multiplier of unit exponential distribution and subsurface alpha_unit minimum values of iteration loops used in deconvolution, described in section 5.3.4 (A), based on water body type. origname: lidar_coeff_alpha_unit_min fullnamepath: /ancillary_data/inland_water/lidar_coeff_alpha_unit_min |
| ancillary_data_inland_water_lidar_coeff_alpha_unit_incr: | Array of 32 bit Reals [FakeDim1 = 0..8][FakeDim3 = 0..1] long_name: Subsurface parameters units: 1 source: ATBD Table 5-2 contentType: auxiliaryInformation description: Iteration loop coefficient multiplier of unit exponential distribution and subsurface alpha_unit step increments used in deconvolution, described in section 5.3.4 (A), based on water body type. origname: lidar_coeff_alpha_unit_incr fullnamepath: /ancillary_data/inland_water/lidar_coeff_alpha_unit_incr |
| ancillary_data_inland_water_gauss_pk_thres: | Array of 32 bit Reals [FakeDim0 = 0..0] long_name: Gaussian Peak Threshold units: 1 source: ATBD Table 5-2 contentType: auxiliaryInformation description: Fraction of the peak amplitude above which Gaussian fit error analysis is executed (ie, calculate error on Gaussian only between the peak amplitude and gauss_pk_thres * peak) origname: gauss_pk_thres fullnamepath: /ancillary_data/inland_water/gauss_pk_thres |
| ancillary_data_inland_water_sseg_mode_cnt_test: | Array of 16 bit Integers [FakeDim8 = 0..5] _FillValue: 127 long_name: Short segment mode count test units: 1 source: ATBD Table 5-2 valid_min: 7 valid_max: 10 contentType: referenceInformation description: Threshold to test number of values contained in short segment histogram multimodes against for inclusion or exclusion of short segment flag_meanings: sseg_stdev_thres_1 sseg_stdev_thres_2 sseg_stdev_thres_3 sseg_stdev_thres_4 sseg_stdev_thres_5 sseg_stdev_thres_6 flag_values: 10, 10, 7, 7, 7, 7 origname: sseg_mode_cnt_test fullnamepath: /ancillary_data/inland_water/sseg_mode_cnt_test |
| ancillary_data_inland_water_shore_buffer: | Array of 16 bit Integers [FakeDim1 = 0..8][FakeDim10 = 0..8] _FillValue: 127 source: ATL13 ATBD, Section 5.2, Table 5-2 valid_min: 0 valid_max: 1 contentType: auxiliaryInformation description: Number of near-shore short segments to ignore in analysis due to near-shore influences. flag_meanings: buffer_0 buffer_1 flag_values: 0, 1 long_name: Shore buffer units: 1 origname: shore_buffer fullnamepath: /ancillary_data/inland_water/shore_buffer |
| ancillary_data_inland_water_h_mavg_c: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Num Depth Bins C units: meters source: ATBD Table 5-2 contentType: auxiliaryInformation description: Number of bins over which to calculate moving average origname: h_mavg_c fullnamepath: /ancillary_data/inland_water/h_mavg_c |
| ancillary_data_inland_water_bckgrd_threshold: | Array of 32 bit Reals [FakeDim3 = 0..1] long_name: Background Threshold units: counts/sec source: ATBD Table 5-2 contentType: auxiliaryInformation description: Thresholds outside of which computed background is flagged (High, Low). origname: bckgrd_threshold fullnamepath: /ancillary_data/inland_water/bckgrd_threshold |
| ancillary_data_inland_water_n2: | Array of 32 bit Reals [FakeDim1 = 0..8] long_name: refractive index of water units: 1 source: ATL13 ATBD Section 5.3.2 C contentType: auxiliaryInformation description: Refractive index of water for a processed water body. origname: n2 fullnamepath: /ancillary_data/inland_water/n2 |
| ancillary_data_inland_water_f2_d_min: | Array of 32 bit Reals [FakeDim0 = 0..0] long_name: Minimum Distance Thres units: meters source: ATBD Table 5-2 contentType: auxiliaryInformation description: Minimum distance threshold between photons required for inclusion in algorithm. origname: f2_d_min fullnamepath: /ancillary_data/inland_water/f2_d_min |
| ancillary_data_inland_water_max_gseg_search: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Max Geoseg Search Radius units: 1 source: ATBD Table 5-2 contentType: auxiliaryInformation description: Maximum number of geosegments in either direction to search for reported water surface heights origname: max_gseg_search fullnamepath: /ancillary_data/inland_water/max_gseg_search |
| ancillary_data_inland_water_sseg_length_test: | Array of 32 bit Reals [FakeDim1 = 0..8] _FillValue: 3.402823466e+38 long_name: Short Segment Length Test units: meters source: ATBD Table 5-2 valid_min: 1.000000000 valid_max: 500.0000000 contentType: auxiliaryInformation description: Threshold by which to test the length of a short segment to determine anomalous or not anomalous, varying by water body type. origname: sseg_length_test fullnamepath: /ancillary_data/inland_water/sseg_length_test |
| ancillary_data_inland_water_h_mavg_a: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Num Depth Bins A units: meters source: ATBD Table 5-2 contentType: auxiliaryInformation description: Number of depth bins over which to compute H_mavg_a origname: h_mavg_a fullnamepath: /ancillary_data/inland_water/h_mavg_a |
| ancillary_data_inland_water_signal_window_bottom: | Array of 32 bit Reals [FakeDim0 = 0..0] long_name: Signal Window Bottom units: meters source: ATBD Table 5-2 contentType: auxiliaryInformation description: Lower limit below coarse water surface to include photons for analysis. origname: signal_window_bottom fullnamepath: /ancillary_data/inland_water/signal_window_bottom |
| ancillary_data_inland_water_amp_mean_sig_min: | Array of 32 bit Reals [FakeDim2 = 0..2] _FillValue: 3.402823466e+38 long_name: iteration loop minimum values units: 1 source: ATBD Table 5-2 contentType: auxiliaryInformation description: Amplitude, mean, and sigma minimum values of iteration loops used in deconvolution described in section 5.3.4(B) origname: amp_mean_sig_min fullnamepath: /ancillary_data/inland_water/amp_mean_sig_min |
| ancillary_data_inland_water_amp_mean_sig_nskip: | Array of 16 bit Integers [FakeDim1 = 0..8][FakeDim2 = 0..2] _FillValue: 127 long_name: Skip factor for surface iterated convolution units: 1 source: ATBD Table 5-2 contentType: auxiliaryInformation description: Number of amplitude, mean height and standard deviation values skipped based on body type, within coarse iteration loops of amplitude, HM_unit and sigma_unit used in deconvolution described in section 5.3.4 (B), to determine an approximate error minimum location over the surface profile range. origname: amp_mean_sig_nskip fullnamepath: /ancillary_data/inland_water/amp_mean_sig_nskip |
| ancillary_data_inland_water_c_fresnel: | Array of 32 bit Reals [FakeDim0 = 0..0] long_name: Fresnel Coeff units: 1 source: ATBD Table 5-2 contentType: auxiliaryInformation description: Fresnel specular reflection coefficient @ 532 nm origname: c_fresnel fullnamepath: /ancillary_data/inland_water/c_fresnel |
| ancillary_data_inland_water_sseg_mode_spread_test: | Array of 32 bit Reals [FakeDim0 = 0..0] long_name: Short Segment Mode Spread Test units: meters source: ATBD Table 5-2 contentType: auxiliaryInformation description: Threshold to test distance between short segment histogram multimodes against for inclusion or exclusion of short segment. origname: sseg_mode_spread_test fullnamepath: /ancillary_data/inland_water/sseg_mode_spread_test |
| ancillary_data_inland_water_anmly_test: | Array of 32 bit Reals [FakeDim1 = 0..8][FakeDim11 = 0..11] long_name: Anomaly Test units: meters source: ATBD Table 5-2 contentType: auxiliaryInformation description: Array containing threshold values against which to test segments for heights that are anomalous to the rest of the water surface. The anmly_test value is selected based on the corresponding length of the water body crossing, calculated in the code as iw_bdy_xlen_flag. The mode of each segment histogram will be tested against ht_water_coarse and marked as anomalous if the difference is greater than the anomaly test value associated with the segment crossing length. origname: anmly_test fullnamepath: /ancillary_data/inland_water/anmly_test |
| ancillary_data_inland_water_h_mavg_b: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Num Depth Bins B units: meters source: ATBD Table 5-2 contentType: auxiliaryInformation description: Number of depth bins over which to compute H_mavg_b origname: h_mavg_b fullnamepath: /ancillary_data/inland_water/h_mavg_b |
| ancillary_data_inland_water_b_long: | Array of 32 bit Reals [FakeDim0 = 0..0] long_name: Long Bin Size units: meters source: ATBD Table 5-2 contentType: auxiliaryInformation description: Bin size to be used by which to establish a histogram of long segments. origname: b_long fullnamepath: /ancillary_data/inland_water/b_long |
| ancillary_data_inland_water_amp_mean_sig_incr: | Array of 32 bit Reals [FakeDim2 = 0..2] _FillValue: 3.402823466e+38 long_name: iteration loop increments units: 1 source: ATBD Table 5-2 contentType: auxiliaryInformation description: Iteration loop amplitude, mean, and sigma step increments used in deconvolution described in section 5.3.4(B) origname: amp_mean_sig_incr fullnamepath: /ancillary_data/inland_water/amp_mean_sig_incr |
| ancillary_data_inland_water_bin_detrend: | Array of 32 bit Reals [FakeDim0 = 0..0] long_name: Detrend Bin Size units: meters source: ATBD Table 5-2 contentType: auxiliaryInformation description: Bin size used to establish a band of heights over which to determine the detrending equation. origname: bin_detrend fullnamepath: /ancillary_data/inland_water/bin_detrend |
| ancillary_data_inland_water_atm_window1: | Array of 32 bit Reals [FakeDim0 = 0..0] long_name: ATM Background Window Bottom units: meters source: ATBD Table 5-2 contentType: auxiliaryInformation description: Lower limit of height above coarse water surface height for atmospheric background count calculation. origname: atm_window1 fullnamepath: /ancillary_data/inland_water/atm_window1 |
| ancillary_data_inland_water_m_avg_d: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Num Depth Bins D units: meters source: ATBD Table 5-2 contentType: auxiliaryInformation description: Number of depth bins over which to compute P_ht_long_subsurf_mavg origname: m_avg_d fullnamepath: /ancillary_data/inland_water/m_avg_d |
| ancillary_data_inland_water_amp_mean_sig_max: | Array of 32 bit Reals [FakeDim2 = 0..2] _FillValue: 3.402823466e+38 long_name: iteration loop maximum values units: 1 source: ATBD Table 5-2 contentType: auxiliaryInformation description: Amplitude, mean, and sigma maximum values of iteration loops used in deconvolution described in section 5.3.4(B) origname: amp_mean_sig_max fullnamepath: /ancillary_data/inland_water/amp_mean_sig_max |
| ancillary_data_inland_water_l_surf: | Array of 32 bit Integers [FakeDim1 = 0..8] _FillValue: 2147483647 long_name: Long Surface Segment Size units: 1 source: ATBD Table 5-2 valid_min: 10 valid_max: 5000 contentType: auxiliaryInformation description: Long segment size, operationally used as unit length over which to detrend the water surface, characterize the surface, and deconvolve the instrument pulse and subsurface effects from the water surface response. origname: l_surf fullnamepath: /ancillary_data/inland_water/l_surf |
| ancillary_data_inland_water_signal_window_top: | Array of 32 bit Reals [FakeDim0 = 0..0] long_name: Signal Window Top units: meters source: ATBD Table 5-2 contentType: auxiliaryInformation description: Upper limit above coarse water surface to include photons for analysis. origname: signal_window_top fullnamepath: /ancillary_data/inland_water/signal_window_top |
| ancillary_data_inland_water_lsbr_threshold: | Array of 32 bit Reals [FakeDim0 = 0..0] long_name: LSBR Threshold units: 1 source: ATBD Table 5-2 contentType: auxiliaryInformation description: Threshold at which the LSBR indicates a significant transition from signal photon richness to noise. origname: lsbr_threshold fullnamepath: /ancillary_data/inland_water/lsbr_threshold |
| ancillary_data_inland_water_l_sub: | Array of 32 bit Integers [FakeDim1 = 0..8] _FillValue: 2147483647 long_name: Long subsurface segment size units: 1 source: ATBD Table 5-2 valid_min: 30 valid_max: 15000 contentType: auxiliaryInformation description: Long segment size, operationally used as unit length over which to characterize the subsurface, and deconvolve the instrument pulse and subsurface effects from the water surface response. origname: l_sub fullnamepath: /ancillary_data/inland_water/l_sub |
| ancillary_data_inland_water_b2_sseg1: | Array of 32 bit Reals [FakeDim0 = 0..0] long_name: Small Segment Height Bin Size units: meters contentType: auxiliaryInformation description: Bin size to be used for histogramming of small segment heights. source: ATBD Table 5-2 origname: b2_sseg1 fullnamepath: /ancillary_data/inland_water/b2_sseg1 |
| ancillary_data_inland_water_shore_buff_sseg_length: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Shore buffer short segment length units: 1 source: ATL13 ATBD, Section 5.2, Table 5-2 contentType: auxiliaryInformation description: Maximum length of a short segment that can be marked as anomalous due to shore buffering. origname: shore_buff_sseg_length fullnamepath: /ancillary_data/inland_water/shore_buff_sseg_length |
| ancillary_data_start_orbit: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Starting Orbit Number units: 1 source: Derived contentType: auxiliaryInformation 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. origname: start_orbit fullnamepath: /ancillary_data/start_orbit |
| ancillary_data_data_start_utc: | Array of Strings [FakeDim0 = 0..0] long_name: Start UTC Time of Granule (CCSDS-A, Actual) units: 1 source: Derived contentType: auxiliaryInformation description: UTC (in CCSDS-A format) of the first data point within the granule. origname: data_start_utc fullnamepath: /ancillary_data/data_start_utc |
| ancillary_data_end_gpsweek: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Ending GPSWeek of Granule (Actual) units: weeks from 1980-01-06 source: Derived contentType: auxiliaryInformation description: GPS week number of the last data point in the granule. origname: end_gpsweek fullnamepath: /ancillary_data/end_gpsweek |
| ancillary_data_start_rgt: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Starting Reference Groundtrack units: 1 source: Derived valid_min: 1 valid_max: 1387 contentType: auxiliaryInformation 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. origname: start_rgt fullnamepath: /ancillary_data/start_rgt |
| ancillary_data_end_gpssow: | Array of 64 bit Reals [FakeDim0 = 0..0] long_name: Ending GPS SOW of Granule (Actual) units: seconds source: Derived contentType: auxiliaryInformation description: GPS seconds-of-week of the last data point in the granule. origname: end_gpssow fullnamepath: /ancillary_data/end_gpssow |
| ancillary_data_start_region: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Starting Region units: 1 source: Derived contentType: auxiliaryInformation 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. origname: start_region fullnamepath: /ancillary_data/start_region |
| ancillary_data_start_gpsweek: | Array of 32 bit Integers [FakeDim0 = 0..0] long_name: Start GPSWeek of Granule (Actual) units: weeks from 1980-01-06 source: Derived contentType: auxiliaryInformation description: GPS week number of the first data point in the granule. origname: start_gpsweek fullnamepath: /ancillary_data/start_gpsweek |
| gt3r_rgt: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] long_name: Reference Ground track units: 1 source: ATL03 valid_min: 1 valid_max: 1387 contentType: referenceInformation 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 1,387 RGTs. origname: rgt fullnamepath: /gt3r/rgt coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_azimuth: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Azimuth standard_name: azimuth units: radians source: ATL13 ATBD, Section 5.3.5 (A) contentType: auxiliaryInformation description: The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees. origname: segment_azimuth fullnamepath: /gt3r/segment_azimuth coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_qf_bias_fit: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Height Bias Fit Quality Flag units: 1 source: Inland Water ATBD valid_min: -3 valid_max: 4 contentType: qualityInformation description: The height bias fit flag is set based on the value of the goodness of fit bias estimated as the difference between the centroid elevations of the observed surface water histogram and fitted integrated water surface model histogram. The flag values are set as follows: = -3 if H_bias_fit < -0.10 (m); -2 if -0.10 <= H_bias_fit < -0.05;-1 when -0.05 <= H_bias_fit < -0.01; 0 if -0.01 <= H_bias_fit < 0.01 (m); 1 if 0.01 <= H_bias_fit < 0.05; 2 if 0.05 < H_bias_fit < 0.10; 3 if 0.10 <= H_bias_fit; 4 if H_bias_fit is invalid. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 equal_to_or_above_threshold6 invalid flag_values: -3, -2, -1, 0, 1, 2, 3, 4 origname: qf_bias_fit fullnamepath: /gt3r/qf_bias_fit coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_sseg_mean_lon: | Array of 64 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 1.7976931348623157e+308 long_name: Mean longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Mean longitude of the signal-qualified photons in a short segment. origname: sseg_mean_lon fullnamepath: /gt3r/sseg_mean_lon coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_cloud_flag_atm_atl09: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Cloud Flag Atm units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 10 contentType: modelResult description: Cloud flag from backscatter profile. origname: cloud_flag_atm_atl09 fullnamepath: /gt3r/cloud_flag_atm_atl09 coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_qf_ice: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Ice Quality Flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 3 contentType: qualityInformation description: The quality flag for ice describes the likelihood of ice on the short water body surface segment. 0 for QF_Bckgrd<= 2; 1 for 2 < QF_Bckgrd<= 4; 2 for 4 < QF_Bckgrd; 3 for (4 < QF_Bckgrd and QF_Cloud=1) flag_meanings: qf_bckgrd_le_2 qf_bckgrd_le_4 qf_bckgrd_gt_4 qf_bckgrd_w_cloud flag_values: 0, 1, 2, 3 origname: qf_ice fullnamepath: /gt3r/qf_ice coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_transect_id: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Transect ID units: 1 source: ATL13 ATBD, Section 5.3.2 (C) contentType: referenceInformation description: Transect within a water body to which the short segment rate output belongs. origname: transect_id fullnamepath: /gt3r/transect_id coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_inland_water_body_type: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Body type units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 1 valid_max: 9 contentType: referenceInformation description: Type of Inland Water Body, where 1=Lake, 2=Known Reservoir, 3=(Reserved for future use), 4=Ephemeral Water, 5=River, 6=Estuary or Bay, 7=Coastal Water, 8=Reserved, 9=Reserved flag_meanings: Lake Known_Reservoir Reserved_for_future_use Ephemeral_Water River Estuary_or_Bay Coastal_Water Reserved Reserved flag_values: 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_type fullnamepath: /gt3r/inland_water_body_type coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_inland_water_body_id: | Array of 32 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 2147483647 long_name: Body ID units: 1 source: ATL13 ATBD, Section 5.3.1 (C) contentType: referenceInformation description: Identifying signature of an individual inland water body. Each body of water is represented by a unique numeric value. origname: inland_water_body_id fullnamepath: /gt3r/inland_water_body_id coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_sseg_end_lon: | Array of 64 bit Reals [gt3r_delta_time = 0..52146] long_name: End longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude at which the short segment ends. May be a signal or non-signal photon. origname: sseg_end_lon fullnamepath: /gt3r/sseg_end_lon coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_qf_subsurface_attenuation: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Subsurface attenuation quality flag units: 1 source: ATL13 ATBD, Section 5.3.4 (A) valid_min: -2 valid_max: 2 contentType: qualityInformation description: Quality flag indicating whether or not the reported subsurface attenuation was constrained during deconvolution by the minimum (initial) limit in the possible range (QF=-1), the maximum limit in the possible range (QF = 1), or was allowed to settle on a solution within the possible range (QF=0). For analysis prior to deconvolution of the subsurface attenuation fit to the observations, the flag indicates whether the value determined by attempting to fit the observations was below (QF= -2), above (QF= 2), or within (QF=0) the possible range of expected values. When the default value for subsurface attenuation is chosen due to any condition other than those defined by an existing quality flag, QF=invalid. flag_meanings: obs_fit_below_range initial_limit within_range maximum_limit obs_fit_above_range flag_values: -2, -1, 0, 1, 2 origname: qf_subsurface_attenuation fullnamepath: /gt3r/qf_subsurface_attenuation coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_quality: | Array of 32 bit Integers [gt3r_delta_time = 0..52146][ds_sseg_quality = 0..3] _FillValue: 2147483647 long_name: Segment quality group count units: 1 source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Four-element array of describing, for each short segment n, the count of photons qualifying in each quality group. (n,1) = nominal, (n,2) = possible afterpulse, (n,3) = possible impulse response effect, (n,4) = possible TEP origname: segment_quality fullnamepath: /gt3r/segment_quality coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_geoid: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Segment Geoid units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Applicable mean-tide system geoid value at reporting location for all short segment statistics. (see geoid_free2mean to convert to the tide-free system.) origname: segment_geoid fullnamepath: /gt3r/segment_geoid coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_qf_sseg_length: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Short Segment Length flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 9 contentType: qualityInformation description: Length of short segments flag. The flag is set as follows: 0 if sseg_length < 10 (meters); 1 if 10 <= sseg_length < 20 (meters); 2 if 20 <= sseg_length < 30 (meters); 3 if 30 <= sseg_length < 50 (meters); 4 if 50 <= sseg_length < 75 (meters); 5 if 75 <= sseg_length < 100 (meters); 6 if 100 <= sseg_length < 150 (meters); 7 if 150 <= sseg_length < 200 (meters); 8 if 200 <= sseg_length < 300 (meters); 9 if 300 <= sseg_length. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 below_threshold7 below_threshold8 below_threshold9 equal_to_or_above_threshold9 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_sseg_length fullnamepath: /gt3r/qf_sseg_length coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_sseg_start_lon: | Array of 64 bit Reals [gt3r_delta_time = 0..52146] long_name: Start longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude at which the short segment begins. May be a signal or non-signal photon. origname: sseg_start_lon fullnamepath: /gt3r/sseg_start_lon coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_tide_equilibrium: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Segment Tide Equilibrium units: meters source: ATL03 contentType: auxiliaryInformation description: Long period equilibrium tide self-consistent with ocean tide model (+- 0.04 m). Although available at short segment rate for all water body types, value is provide mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_tide_equilibrium fullnamepath: /gt3r/segment_tide_equilibrium coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_qf_lseg_length: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Long Segment Length flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 3 contentType: qualityInformation description: The Long Segment Length flag is set based on the length of the long segment. The flag is set as follows: 0 if Lseg_length < 500 (meters); 1 if 50 <= Lseg_length < 1500 (meters); 2 if 150 <= Lseg_length < 3000 (meters); 3 if 3000 <= Lseg_length flag_meanings: below_threshold1 below_threshold2 below_threshold3 above_threshold4 flag_values: 0, 1, 2, 3 origname: qf_lseg_length fullnamepath: /gt3r/qf_lseg_length coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_significant_wave_ht: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: SWH units: meters source: section 5.3.3 (C) contentType: physicalMeasurement description: Significant wave height origname: significant_wave_ht fullnamepath: /gt3r/significant_wave_ht coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_bottom_lat: | Array of 64 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 1.7976931348623157e+308 long_name: Bottom latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of actual bottom location, based on the apparent bottom sseg_mean_lat / sseg_mean_lon location corrected for refraction effects. origname: bottom_lat fullnamepath: /gt3r/bottom_lat coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_cycle_number: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] long_name: Cycle Number units: counts source: ATL03 valid_min: 0 valid_max: 50 contentType: referenceInformation 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 1,387 and adding the RGT value. origname: cycle_number fullnamepath: /gt3r/cycle_number coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_qf_subsurface_backscat_ampltd: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Subsurface backscatter amplitude quality flag units: 1 source: ATL13 ATBD, Section 5.3.4 (A) valid_min: -2 valid_max: 2 contentType: qualityInformation description: Quality flag indicating whether or not the reported subsurface backscatter amplitude was constrained during deconvolution by the minimum limit in the possible range (QF=-1), the maximum limit in the possible range (QF = 1), or was allowed to settle on a solution within the possible range (QF=0). For analysis prior to deconvolution of the backscatter amplitude fit to the observations, the flag indicates whether the value determined by attempting to fit the observations was below (QF= -2), above (QF= 2), or within (QF=0) the possible range of expected values. When the default value for backscatter amplitude is chosen due to any condition other than those defined by an existing quality flag, QF=invalid. flag_meanings: obs_fit_below_range initial_limit within_range maximum_limit obs_fit_above_range flag_values: -2, -1, 0, 1, 2 origname: qf_subsurface_backscat_ampltd fullnamepath: /gt3r/qf_subsurface_backscat_ampltd coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_water_depth: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Water depth units: meters source: ATL13 ATBD, Section 5.3.4 (A) contentType: referenceInformation description: Depth from the mean water surface to detected bottom. origname: water_depth fullnamepath: /gt3r/water_depth coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_qf_bias_em: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: EM Bias Quality Flag units: 1 source: Inland Water ATBD valid_min: -3 valid_max: 4 contentType: qualityInformation description: The Electromagnetic Bias flag is set based on threshold checks for the estimated electromagnetic height bias. The flag is set as follows: -3 if H_bias_EM < -0.10 (m); -2 if -0.10 < H_bias_EM < -0.05; -1 if -0.05 <= H_bias_EM < -0.01; 0 if -0.01 <= H_bias_EM < 0.01 (m); 1 if 0.01 <= H_bias_EM < 0.05; 2 if 0.05 <= H_bias_EM < 0.10; 3 if 0.10 < H_bias_EM; 4 if H_bias_EM is invalid. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 above_threshold6 invalid flag_values: -3, -2, -1, 0, 1, 2, 3, 4 origname: qf_bias_em fullnamepath: /gt3r/qf_bias_em coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_id_end: | Array of 32 bit Integers [gt3r_delta_time = 0..52146] long_name: Last ATL03 Segment ID units: 1 source: ATL03 contentType: referenceInformation description: Last ATL03 segment_id associated with the photons within this inland water segment. origname: segment_id_end fullnamepath: /gt3r/segment_id_end coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_qf_stdev_vlseg: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: observed standard deviation quality flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Quality flag indicating the magnitude of standard deviation (SD) of observed detrended heights of the very long segment to which the short segment belongs, where 0: SD < 0.5 (meters), 1: 0.5 <= SD < 1.5, 2: 1.5 <= SD < 2.5, 3: 2.5 <= SD < 3.5, 4: 3.5 <= SD < 4.5, 5: 4.5 <= SD < 5.5, 6: 5.5 <= SD < 6.5, 7: 6.5 <= SD < 7.5, 8: 7.5 <= SD < 8.5, 9: 8.5 <= SD. It is recommended that a user consider this flag in conjunction with the water body type and size to best determine if the observed surface standard deviation is reasonable or whether results should be considered questionable. flag_meanings: SD_below_0.5 SD_below_1.5 SD_below_2.5 SD_below_3.5 SD_below_4.5 SD_below_5.5 SD_below_6.5 SD_below_7.5 SD_below_8.5 SD_greater_or_equal_to_8.5 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_stdev_vlseg fullnamepath: /gt3r/qf_stdev_vlseg coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_apparent_ht: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Apparent height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Apparent height of the short segment, before adjustments are made by the algorithm, based on an average of heights within a designated range of the short segment mode. origname: segment_apparent_ht fullnamepath: /gt3r/segment_apparent_ht coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_stdev_water_surf: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Surface StDev units: meters source: section 5.3.3 (C) contentType: referenceInformation description: Standard deviation of water surface, calculated over long segments with result reported at each short segment location tag contained within. origname: stdev_water_surf fullnamepath: /gt3r/stdev_water_surf coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_met_wind10_atl09: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Wind speed magnitude at 10m standard_name: Wind speed units: m/s source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Wind speed magnitude at 10m height from ATL09 input. origname: met_wind10_atl09 fullnamepath: /gt3r/met_wind10_atl09 coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_qf_iwp: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Inland Water Segment Processing Flag units: 1 source: Inland Water ATBD valid_min: 1 valid_max: 7 contentType: qualityInformation description: Describes the level of processing the inland water algorithm was able to perform based on the data available, ranging from one to 7. flag_meanings: 1_short_segment 2_short_segments 3_to_5_short_segments 6_to_7_short_segments 8_to_9_short_segments 10_to_29_short_segments at_least_30_short_segments flag_values: 1, 2, 3, 4, 5, 6, 7 origname: qf_iwp fullnamepath: /gt3r/qf_iwp coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_anom_ssegs_rgt: | Array of 16 bit Integers [gt3r_anom_ssegs_anom_sseg_time = 0..27494] long_name: Reference Ground track units: 1 source: ATL03 valid_min: 1 valid_max: 1387 contentType: referenceInformation 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 1,387 RGTs. origname: rgt fullnamepath: /gt3r/anom_ssegs/rgt coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lat gt3r_anom_ssegs_anom_sseg_lon |
| gt3r_anom_ssegs_anom_sseg_trigger_flag: | Array of 16 bit Integers [gt3r_anom_ssegs_anom_sseg_time = 0..27494][ds_anom_trigger = 0..8] _FillValue: 127 long_name: Anomalous classification flag units: 1 source: ATL13 ATBD, Table 5-4b valid_min: 0 valid_max: 1 contentType: qualityInformation description: Nine element array describing justification for short segment classification as anomalous, where for each element 0 = not triggered as anomalous and 1 = triggered as anomalous due to any of the following causes: [element 1=coarse ht difference, element 2=abnormal length, element 3= histogram mode spread, element 4=histogram mode count, element 5=histogram mode intensity, element 6=invalid long segment, element 7=shore buffer designation, element 8=insufficient signal phs, element 9=transect coarse water height unavailable against which to test short segment height] flag_meanings: not_triggered_as_anomalous triggered_as_anomalous flag_values: 0, 1 origname: anom_sseg_trigger_flag fullnamepath: /gt3r/anom_ssegs/anom_sseg_trigger_flag coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lat gt3r_anom_ssegs_anom_sseg_lon |
| gt3r_anom_ssegs_anom_sseg_quality: | Array of 32 bit Integers [gt3r_anom_ssegs_anom_sseg_time = 0..27494][ds_sseg_quality = 0..3] long_name: Segment quality group count units: 1 source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Four-element array of describing, for each anomalous short segment n, the count of photons qualifying in each quality group. (n,1) = nominal, (n,2) = possible afterpulse, (n,3) = possible impulse response effect, (n,4) = possible TEP _FillValue: 2147483647 origname: anom_sseg_quality fullnamepath: /gt3r/anom_ssegs/anom_sseg_quality coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lat gt3r_anom_ssegs_anom_sseg_lon |
| gt3r_anom_ssegs_transect_id: | Array of 16 bit Integers [gt3r_anom_ssegs_anom_sseg_time = 0..27494] _FillValue: 127 long_name: Transect ID units: 1 source: ATL13 ATBD, Section 5.3.2 (C) contentType: referenceInformation description: Transect within a water body to which the short segment rate output belongs. origname: transect_id fullnamepath: /gt3r/anom_ssegs/transect_id coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lat gt3r_anom_ssegs_anom_sseg_lon |
| gt3r_anom_ssegs_cycle_number: | Array of 16 bit Integers [gt3r_anom_ssegs_anom_sseg_time = 0..27494] long_name: Cycle Number units: counts source: ATL03 valid_min: 0 valid_max: 50 contentType: referenceInformation 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 1,387 and adding the RGT value. origname: cycle_number fullnamepath: /gt3r/anom_ssegs/cycle_number coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lat gt3r_anom_ssegs_anom_sseg_lon |
| gt3r_anom_ssegs_anom_sseg_lat: | Array of 64 bit Reals [gt3r_anom_ssegs_anom_sseg_time = 0..27494] long_name: Latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of the short segment (mean of signal class >=2 ph Lats). origname: anom_sseg_lat fullnamepath: /gt3r/anom_ssegs/anom_sseg_lat coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lon |
| gt3r_anom_ssegs_anom_sseg_stdev: | Array of 32 bit Reals [gt3r_anom_ssegs_anom_sseg_time = 0..27494] _FillValue: 3.402823466e+38 long_name: Segment standard deviation units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Standard deviation of anomalous short segment photon height in the anomalous short segment with signal classification >=2. origname: anom_sseg_stdev fullnamepath: /gt3r/anom_ssegs/anom_sseg_stdev coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lat gt3r_anom_ssegs_anom_sseg_lon |
| gt3r_anom_ssegs_anom_sseg_ht_delta: | Array of 32 bit Reals [gt3r_anom_ssegs_anom_sseg_time = 0..27494] _FillValue: 3.402823466e+38 long_name: Height difference units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Height difference between anom_sseg_mode of the anomalous short segment and the transect coarse_transect_ht. origname: anom_sseg_ht_delta fullnamepath: /gt3r/anom_ssegs/anom_sseg_ht_delta coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lat gt3r_anom_ssegs_anom_sseg_lon |
| gt3r_anom_ssegs_anom_sseg_length: | Array of 64 bit Reals [gt3r_anom_ssegs_anom_sseg_time = 0..27494] _FillValue: 1.7976931348623157e+308 long_name: Segment length units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Length of the short segment, based on end points computed by the average of sseg_endpoint_avg_n signal photons. origname: anom_sseg_length fullnamepath: /gt3r/anom_ssegs/anom_sseg_length coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lat gt3r_anom_ssegs_anom_sseg_lon |
| gt3r_anom_ssegs_anom_sseg_end_lon: | Array of 64 bit Reals [gt3r_anom_ssegs_anom_sseg_time = 0..27494] long_name: End longitude standard_name: longitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: End longitude of the anomalous short segment, based on the average longitude of the last sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_end_lon fullnamepath: /gt3r/anom_ssegs/anom_sseg_end_lon coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lat gt3r_anom_ssegs_anom_sseg_lon |
| gt3r_anom_ssegs_coarse_transect_ht: | Array of 32 bit Reals [gt3r_anom_ssegs_anom_sseg_time = 0..27494] _FillValue: 3.402823466e+38 long_name: Coarse water height units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Coarse water height of transect. origname: coarse_transect_ht fullnamepath: /gt3r/anom_ssegs/coarse_transect_ht coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lat gt3r_anom_ssegs_anom_sseg_lon |
| gt3r_anom_ssegs_anom_sseg_mode: | Array of 32 bit Reals [gt3r_anom_ssegs_anom_sseg_time = 0..27494] _FillValue: 3.402823466e+38 long_name: Anomalous mode bin height units: meters source: ATL13 ATBD, Table 5-4b contentType: referenceInformation description: Height of anomalous short segment as determined by histogram bin mode. origname: anom_sseg_mode fullnamepath: /gt3r/anom_ssegs/anom_sseg_mode coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lat gt3r_anom_ssegs_anom_sseg_lon |
| gt3r_anom_ssegs_anom_sseg_lon: | Array of 64 bit Reals [gt3r_anom_ssegs_anom_sseg_time = 0..27494] long_name: Longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of the short segment (mean of signal class >=2 ph Lons). origname: anom_sseg_lon fullnamepath: /gt3r/anom_ssegs/anom_sseg_lon coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lat |
| gt3r_anom_ssegs_anom_sseg_start_lon: | Array of 64 bit Reals [gt3r_anom_ssegs_anom_sseg_time = 0..27494] long_name: Start longitude standard_name: longitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Start longitude of the anomalous short segment, based on the average longitude of the first sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_start_lon fullnamepath: /gt3r/anom_ssegs/anom_sseg_start_lon coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lat gt3r_anom_ssegs_anom_sseg_lon |
| gt3r_anom_ssegs_anom_sseg_mean_ht_ortho: | Array of 32 bit Reals [gt3r_anom_ssegs_anom_sseg_time = 0..27494] _FillValue: 3.402823466e+38 long_name: Orthometric Height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Orthometric height of anomalous short segment as determined by the mean of photon orthometric heights in the anomalous short segment with signal classification >2 origname: anom_sseg_mean_ht_ortho fullnamepath: /gt3r/anom_ssegs/anom_sseg_mean_ht_ortho coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lat gt3r_anom_ssegs_anom_sseg_lon |
| gt3r_anom_ssegs_anom_sseg_start_lat: | Array of 64 bit Reals [gt3r_anom_ssegs_anom_sseg_time = 0..27494] long_name: Start latitude standard_name: latitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Start latitude of the anomalous short segment, based on the average latitude of the first sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_start_lat fullnamepath: /gt3r/anom_ssegs/anom_sseg_start_lat coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lat gt3r_anom_ssegs_anom_sseg_lon |
| gt3r_anom_ssegs_anom_sseg_end_lat: | Array of 64 bit Reals [gt3r_anom_ssegs_anom_sseg_time = 0..27494] long_name: End latitude standard_name: latitude units: degrees source: ATL13 ATBD, Table 5-4b valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: End latitude of the anomalous short segment, based on the average latitude of the last sseg_endpoint_avg_n signal photons in the segment. origname: anom_sseg_end_lat fullnamepath: /gt3r/anom_ssegs/anom_sseg_end_lat coordinates: gt3r_anom_ssegs_anom_sseg_time gt3r_anom_ssegs_anom_sseg_lat gt3r_anom_ssegs_anom_sseg_lon |
| gt3r_segment_podppd_flag: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 0 long_name: POD_PPD Flag units: 1 source: ATL02, ANC04, ANC05 valid_min: 0 valid_max: 7 contentType: referenceInformation description: Composite POD/PPD flag that indicates the quality of input geolocation products for the utilized ATL03 segments on an ATL13 short segment output basis. A non-zero value may indicate that geolocation solutions are degraded or that ATLAS is within a calibration scan period (CAL). The ATL03 sigma values should indicate the degree of uncertainty associated with the degradation. Possible non-CAL values are: 0=NOMINAL; 1=POD_DEGRADE; 2=PPD_DEGRADE; 3=PODPPD_DEGRADE; possible CAL values are: 4=CAL_NOMINAL; 5=CAL_POD_DEGRADE; 6=CAL_PPD_DEGRADE; 7=CAL_PODPPD_DEGRADE; flag_meanings: nominal pod_degrade ppd_degrade podppd_degrade cal_nominal cal_pod_degrade cal_ppd_degrade cal_podppd_degrade flag_values: 0, 1, 2, 3, 4, 5, 6, 7 origname: segment_podppd_flag fullnamepath: /gt3r/segment_podppd_flag coordinates: gt3r_delta_time |
| gt3r_qf_ht_adj: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Height adjustment Quality Flag units: 1 source: ATL13 ATBD, Section 5.3.5 (C) valid_min: -4 valid_max: 5 contentType: qualityInformation description: Flag representing the range of height, defined in 5.3.5 (C), which has been added to the apparent surface height due to frame of reference scaling during deconvolution analysis. flag_meanings: below_threshold1 below_threshold2 below_threshold3 below_threshold4 below_threshold5 below_threshold6 below_threshold7 below_threshold8 equal_to_or_above_threshold8 invalid flag_values: -4, -3, -2, -1, 0, 1, 2, 3, 4, 5 origname: qf_ht_adj fullnamepath: /gt3r/qf_ht_adj coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_full_sat_fract: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Full Saturation Fraction units: 1 source: ATL13 ATBD, Section 5.2 valid_min: 0.000000000 valid_max: 1.000000000 contentType: qualityInformation description: The fraction of pulses within the short segment determined to be fully saturated based on ATL03 geosegment rate input. origname: segment_full_sat_fract fullnamepath: /gt3r/segment_full_sat_fract coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_id_beg: | Array of 32 bit Integers [gt3r_delta_time = 0..52146] long_name: First ATL03 Segment ID units: 1 source: ATL03 contentType: referenceInformation description: First ATL03 segment_id associated with the photons within this inland water segment. origname: segment_id_beg fullnamepath: /gt3r/segment_id_beg coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_qf_subsurf_anomaly: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] units: 1 source: Inland Water ATBD 5.3.4(A) valid_min: 1 valid_max: 3 contentType: qualityInformation description: Describes the likelihood that the bottom or other subsurface anomaly is bottom based on the threshold value at which an anomaly was found. 1 = Subsurface anomaly due to bottom likely; 2 = Subsurface signal may indicate bottom or other anomaly; 3 = Possible subsurface anomaly; invalid = No subsurface anomaly detected flag_meanings: bottom_likely bottom_or_other_anomaly possible_subsurface_anomaly flag_values: 1, 2, 3 _FillValue: 127 long_name: Subsurface Anomaly Quality Flag origname: qf_subsurf_anomaly fullnamepath: /gt3r/qf_subsurf_anomaly coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_subsurface_attenuation: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Subsurface Attenuation units: m^-1 source: Section 5.3.4 (A) contentType: physicalMeasurement description: Subsurface attenuation coefficient. origname: subsurface_attenuation fullnamepath: /gt3r/subsurface_attenuation coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_layer_flag_atl09: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Consolidated cloud flag units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 1 contentType: qualityInformation description: Consolidated cloud flag. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 origname: layer_flag_atl09 fullnamepath: /gt3r/layer_flag_atl09 coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_inland_water_body_region: | Array of 32 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 2147483647 long_name: Body region units: 1 source: ATL13 ATBD, Section 5.3.1 (A) contentType: referenceInformation description: ATL13-created shapefile representing relevant bodies of water over which to implement the ATL13 water surface finding algorithm only within a region of processing interest. origname: inland_water_body_region fullnamepath: /gt3r/inland_water_body_region coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_sseg_end_lat: | Array of 64 bit Reals [gt3r_delta_time = 0..52146] long_name: End latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Latitude at which the short segment ends. May be a signal or non-signal photon. origname: sseg_end_lat fullnamepath: /gt3r/sseg_end_lat coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_cloud_flag_asr_atl09: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Cloud Flag ASR units: 1 source: ATL13 ATBD, Section 5.3.5 (A) valid_min: 0 valid_max: 5 contentType: modelResult description: Cloud probability from ASR. flag_meanings: clear_with_high_confidence clear_with_medium_confidence clear_with_low_confidence cloudy_with_low_confidence cloudy_with_medium_confidence cloudy_with_high_confidence flag_values: 0, 1, 2, 3, 4, 5 origname: cloud_flag_asr_atl09 fullnamepath: /gt3r/cloud_flag_asr_atl09 coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_ice_flag: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Ice Flag units: 1 source: ATL13 ATBD, section 5.2 valid_min: 0 valid_max: 1 contentType: qualityInformation description: Describes likelihood of ice on water surface short segment. flag_meanings: no_ice ice flag_values: 0, 1 origname: ice_flag fullnamepath: /gt3r/ice_flag coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_sseg_start_lat: | Array of 64 bit Reals [gt3r_delta_time = 0..52146] long_name: Start latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.2 (C) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude at which the short segment begins. May be a signal or non-signal photon. origname: sseg_start_lat fullnamepath: /gt3r/sseg_start_lat coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_ref_elev: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: elevation standard_name: elevation units: radians source: ATL13 ATBD, Section 5.3.5 (A) contentType: auxiliaryInformation 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. origname: segment_ref_elev fullnamepath: /gt3r/segment_ref_elev coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_lon: | Array of 64 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 1.7976931348623157e+308 long_name: Longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of reporting location for all short segment statistics. origname: segment_lon fullnamepath: /gt3r/segment_lon coordinates: gt3r_delta_time gt3r_segment_lat |
| gt3r_ht_ortho: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Orthometric Height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Orthometric height EGM2008 converted from ellipsoidal height. origname: ht_ortho fullnamepath: /gt3r/ht_ortho coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_lat: | Array of 64 bit Reals [gt3r_delta_time = 0..52146] long_name: Latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Latitude of reporting location for all short segment statistics. origname: segment_lat fullnamepath: /gt3r/segment_lat coordinates: gt3r_delta_time gt3r_segment_lon |
| gt3r_ht_water_surf: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Water surface height units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Water surface height, reported for each short segment (default length = approximately 100 signal photons) with reference to WGS84 ellipsoid origname: ht_water_surf fullnamepath: /gt3r/ht_water_surf coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_near_sat_fract: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Near Saturation Fraction units: 1 source: ATL13 ATBD, Section 5.2 valid_min: 0.000000000 valid_max: 1.000000000 contentType: qualityInformation description: The fraction of pulses within the short segment determined to be nearly saturated based on ATL03 geosegment rate input. origname: segment_near_sat_fract fullnamepath: /gt3r/segment_near_sat_fract coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_err_ht_water_surf: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Height Error units: 1 source: section 5.3.3 (C) contentType: qualityInformation description: Error included in heights reported in ht_water_surf. origname: err_ht_water_surf fullnamepath: /gt3r/err_ht_water_surf coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_bottom_lon: | Array of 64 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 1.7976931348623157e+308 long_name: Mean longitude standard_name: longitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -180.00000000000000 valid_max: 180.00000000000000 contentType: referenceInformation description: Longitude of actual bottom location, based on the apparent bottom sseg_mean_lat / sseg_mean_lon location corrected for refraction effects. origname: bottom_lon fullnamepath: /gt3r/bottom_lon coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_bias_fit: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Goodness of fit bias units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Bias contribution from goodness of observation/system response fit. (Has been applied to ht_ortho and _ht_water_surf products) origname: segment_bias_fit fullnamepath: /gt3r/segment_bias_fit coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_qf_cloud: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Consolidated cloud flag units: 1 source: ATL09 valid_min: 0 valid_max: 1 contentType: qualityInformation description: This flag is a combination of multiple flags (cloud_flag_atm, cloud_flag_asr, and bsnow_con) and takes daytime/nighttime into consideration. A value of 1 means clouds or blowing snow are likely present. A value of 0 indicates the likely absence of clouds or blowing snow. From the ATL09 data closest to the segment time. flag_meanings: likely_clear likely_cloudy flag_values: 0, 1 origname: qf_cloud fullnamepath: /gt3r/qf_cloud coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_inland_water_body_source: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Body source units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 1 valid_max: 9 contentType: referenceInformation description: Source of Inland Water Body shape, where 1=HydroLAKES, 2=Global Lakes and Wetlands Database, 3=Named Marine Water Bodies, 4=GSHHG Shoreline, 5=Global River Widths from Landsat, 6=Reserved, 7=Reserved, 8=Reserved, 9=Reserved flag_meanings: HydroLAKES Global_Lakes_and_Wetlands_Database Named_Marine_Water_Bodies GSHHG_Shoreline Global_River_Widths_from_Landsat Reserved Reserved Reserved Reserved flag_values: 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_source fullnamepath: /gt3r/inland_water_body_source coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_tide_earth_free2mean: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Earth Tide Free-to-Mean conversion units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Segment rate value to convert solid earth tide from the tide-free system that was applied in ATL03 to photon heights to the ht_water_surf to the mean-tide system. Subtract value from ht_water_surf to reference it in the mean-tide system. Applicable value at reporting location for all short segment statistics. origname: segment_tide_earth_free2mean fullnamepath: /gt3r/segment_tide_earth_free2mean coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_qf_stdev_lseg: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: observed standard deviation quality flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Quality flag indicating the magnitude of standard deviation (SD) of observed detrended heights of the long segment to which the short segment belongs, where 0: SD < 0.5 (meters), 1: 0.5 <= SD < 1.5, 2: 1.5 <= SD < 2.5, 3: 2.5 <= SD < 3.5, 4: 3.5 <= SD < 4.5, 5: 4.5 <= SD < 5.5, 6: 5.5 <= SD < 6.5, 7: 6.5 <= SD < 7.5, 8: 7.5 <= SD < 8.5, 9: 8.5 <= SD. It is recommended that a user consider this flag in conjunction with the water body type and size to best determine if the observed surface standard deviation is reasonable or whether results should be considered questionable. flag_meanings: SD_below_0.5 SD_below_1.5 SD_below_2.5 SD_below_3.5 SD_below_4.5 SD_below_5.5 SD_below_6.5 SD_below_7.5 SD_below_8.5 SD_greater_or_equal_to_8.5 flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: qf_stdev_lseg fullnamepath: /gt3r/qf_stdev_lseg coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_dem_source: | Array of 32 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 2147483647 long_name: dem source flag units: 1 source: ATL13 ATBD, Section 5.3.5 valid_min: 0 valid_max: 4 contentType: referenceInformation description: Flag equal to the source of the selected photon (in hierarchy of Arctic/Global/MSS/Antarctic). Values: 0=None, 1=Arctic, 2=Global, 3=MSS, 4=Antarctic. flag_meanings: none arctic global mss antarctic flag_values: 0, 1, 2, 3, 4 origname: segment_dem_source fullnamepath: /gt3r/segment_dem_source coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_fpb_correction: | Array of 64 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 1.7976931348623157e+308 long_name: First photon bias correction units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: First photon bias correction. May be applied at user disrection by subtracting from mean height produts ht_ortho and ht_water_surf. origname: segment_fpb_correction fullnamepath: /gt3r/segment_fpb_correction coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_inland_water_body_size: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Body size units: 1 source: ATL13 ATBD, Section 5.3.1 (C) valid_min: 0 valid_max: 9 contentType: referenceInformation description: Size of Inland Water Body, A=area, where 0=Not_Assigned, 1=A>10,000 sq km, 2=10,000>A>=1,000, 3=1,000>A>=100, 4=100>A>=10, 5=10>A>=1, 6=1>A>=0.1, 7=0.01>A, 8=Reserved, 9=Reserved flag_meanings: not_assigned area_gt_10000 10000_gt_area_ge_1000 1000_gt_area_ge_100 100_gt_area_ge_10 10_gt_area_ge_1 1_gt_area_ge_0.1 0.01_gt_area Reserved Reserved flag_values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: inland_water_body_size fullnamepath: /gt3r/inland_water_body_size coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_met_wind10_atl13: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Wind speed magnitude at 10m standard_name: Wind speed units: m/s source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Wind speed magnitude at 10m height, based on derived water surface wave height. origname: met_wind10_atl13 fullnamepath: /gt3r/met_wind10_atl13 coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_snow_ice_atl09: | Array of 32 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 2147483647 long_name: Snow Ice Flag units: 1 source: ATL13 ATBD, Section 5.3.5 (A) contentType: modelResult description: NOAA snow/ice flag scaled by ATL09 (0=ice-free water, 1=snow-free land, 2=snow, 3=ice, 127=invalid) flag_meanings: ice_free_water snow_free_land snow ice invalid flag_values: 0, 1, 2, 3, 127 origname: snow_ice_atl09 fullnamepath: /gt3r/snow_ice_atl09 coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_tide_ocean: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Segment Tide Ocean units: meters source: ATL03 contentType: auxiliaryInformation description: Ocean tides including diurnal and semi-diurnal (harmonic analysis (+-4 m)). Although available at short segment rate for all water body types, value is provide mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_tide_ocean fullnamepath: /gt3r/segment_tide_ocean coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_err_slope_trk: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] units: 1 _FillValue: 3.402823466e+38 long_name: Slope Error source: section 5.3.3 (C) contentType: qualityInformation description: Error included in segment_slope_trk_local. origname: err_slope_trk fullnamepath: /gt3r/err_slope_trk coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_slope_trk_bdy: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Water Body Slope units: m/m source: ATL13 ATBD, Section 5.3.5 (A) contentType: physicalMeasurement description: Along track water body surface slope, reported per short segment ID per water body. origname: segment_slope_trk_bdy fullnamepath: /gt3r/segment_slope_trk_bdy coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_sseg_mean_lat: | Array of 64 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 1.7976931348623157e+308 long_name: Mean latitude standard_name: latitude units: degrees source: ATL13 ATBD, Section 5.3.5 (A) valid_min: -90.000000000000000 valid_max: 90.000000000000000 contentType: referenceInformation description: Mean latitude of the signal-qualified photons in a short segment. origname: sseg_mean_lat fullnamepath: /gt3r/sseg_mean_lat coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_geoid_free2mean: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Geoid Free-to-Mean conversion units: meters source: ATL03 ATBD, Section 6.3.8 contentType: auxiliaryInformation description: Value to convert segment geoid heights from the mean-tide system to the tide-free system. Subtract this value from mean-tide system segment_geoid (on ATL13) to get geoid heights in the tide-free system. Applicable value at reporting location for all short segment statistics. origname: segment_geoid_free2mean fullnamepath: /gt3r/segment_geoid_free2mean coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_qf_spec_width: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Spectral width Flag units: 1 source: ATL13 ATBD, Section 4.8.8 valid_min: 0 valid_max: 9 contentType: qualityInformation description: Spectral moments width flag. The flag is set as follows: 0 when spec_width is invalid; 1 when 0 <= spec_width <= 0.2; 2 when 0.2 < spec_width <= 0.3; 3 when 0.3 < spec_width <= 0.4; 4 when 0.4 < spec_width <= 0.5; 5 when 0.5 < spec_width <= 0.6; 6 when 0.6 < spec_width <= 0.7; 7 when 0.7 < spec_width <= 0.8; 8 when 0.8 < spec_width <= 0.9; 9 when 0.9 < spec_width. flag_meanings: invalid 0<=spec_width<=0.2 0.2 origname: qf_spec_width fullnamepath: /gt3r/qf_spec_width coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_qf_bckgrd: | Array of 16 bit Integers [gt3r_delta_time = 0..52146] _FillValue: 127 long_name: Background Quality Flag units: 1 source: Inland Water ATBD valid_min: 0 valid_max: 6 contentType: qualityInformation description: Describes the degree of background photons present in each short segment. bckgrd_dnsty_threshold1= 0.001 (counts per bi per Lseg); bckgrd_dnsty_threshold2= 0.01 (counts per bin per Lseg); bckgrd_dnsty_threshold3= 0.05 (counts per bin per Lseg); bckgrd_dnsty_threshold4= 0.1 (counts per bin per Lseg); bckgrd_dnsty_threshold5= 0.3 (counts per bin per Lseg); bckgrd_dnsty_threshold6= 0.5 (counts per bin per Lseg) flag_meanings: equal_to_or_below_threshold1 equal_to_or_below_threshold2 equal_to_or_below_threshold3 equal_to_or_below_threshold4 equal_to_or_below_threshold5 equal_to_or_below_threshold6 above_threshold6 flag_values: 0, 1, 2, 3, 4, 5, 6 origname: qf_bckgrd fullnamepath: /gt3r/qf_bckgrd coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_sseg_mean_time: | Array of 64 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 1.7976931348623157e+308 long_name: Mean time standard_name: time units: Seconds since 2018-01-01 source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Mean time of the signal-qualified photons in a short segment. origname: sseg_mean_time fullnamepath: /gt3r/sseg_mean_time coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_met_ts_atl09: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Surface temperature standard_name: temperature units: K source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Surface (skin) temperature from ATL09. origname: met_ts_atl09 fullnamepath: /gt3r/met_ts_atl09 coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_bias_em: | Array of 64 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 1.7976931348623157e+308 long_name: Electromagnetic bias units: meters source: ATL13 ATBD, Section 5.3.5 (A) contentType: referenceInformation description: Electromagnetic bias. (Has been applied to ht_ortho and _ht_water_surf products) origname: segment_bias_em fullnamepath: /gt3r/segment_bias_em coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_dem_ht: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: DEM Height units: meters source: ATL13 ATBD, Section 5.3.5 contentType: referenceInformation description: DEM height relative to WGS-84 ellipsoid, reported at the short segment rate. origname: segment_dem_ht fullnamepath: /gt3r/segment_dem_ht coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_subsurface_backscat_ampltd: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Subsurface backscatter amplitude units: 1 source: Section 5.3.4 (A) contentType: modelResult description: Subsurface backscatter amplitude, described in section 4.5.3, reported per long segment (default length = 10 short segments = approximately 1000 signal photons). origname: subsurface_backscat_ampltd fullnamepath: /gt3r/subsurface_backscat_ampltd coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| gt3r_segment_dac: | Array of 32 bit Reals [gt3r_delta_time = 0..52146] _FillValue: 3.402823466e+38 long_name: Segment DAC units: meters source: ATBD Section 5.3.5A contentType: auxiliaryInformation description: Dynamic atmospheric correction (DAC) includes inverted barometer (IB) effect (+- 5 cm). Although available at short segment rate for all water body types, value is provided mainly for transitional tidal and coastal water (types 6 and 7) and the largest lakes of Type 1 (~> 10,000 km2) for user's discretion. origname: segment_dac fullnamepath: /gt3r/segment_dac coordinates: gt3r_delta_time gt3r_segment_lat gt3r_segment_lon |
| ds_anom_trigger: | Array of 32 bit Integers [ds_anom_trigger = 0..8] long_name: Anomaly Trigger Dimension Scale units: 1 source: dim_scale valid_min: 1 valid_max: 9 contentType: auxiliaryInformation description: Dimension scale indexing the short segment anomaly trigger array having nine elements. Index = 1 corresponds to coarse ht difference; Index = 2 corresponds to abnormal length; Index = 3 corresponds to histogram mode spread; Index = 4 corresponds to histogram mode count; Index = 5 corresponds to histogram mode intensity; Index = 6 corresponds to invalid long segment; Index = 7 corresponds to shore buffer designation; Index = 8 corresponds to insufficient signal phs; Index = 9 corresponds to unavailability of coarse water height against which to test. flag_meanings: coarse_ht_difference abnormal_length histogram_mode_spread histogram_mode_count histogram_mode_intensity invalid_long_segment shore_buffer_designation insufficient_signal_phs coarse_water_height_unavailable flag_values: 1, 2, 3, 4, 5, 6, 7, 8, 9 origname: ds_anom_trigger fullnamepath: /ds_anom_trigger |
| ds_sseg_quality: | Array of 32 bit Integers [ds_sseg_quality = 0..3] long_name: Segment Quality Dimension Scale units: 1 source: dim_scale valid_min: 1 valid_max: 4 contentType: auxiliaryInformation description: Dimension scale indexing the short segment quality array. Index = 1 corresponds to nominal; Index = 2 corresponds to possible afterpulse; Index = 3 corresponds to possible impulse response; Index = 4 corresponds to possible TEP flag_meanings: nominal possible_afterpulse possible_impulse_response possible_TEP flag_values: 1, 2, 3, 4 origname: ds_sseg_quality fullnamepath: /ds_sseg_quality |
| gt1l_anom_ssegs_anom_sseg_time: | Array of 64 bit Reals [gt1l_anom_ssegs_anom_sseg_time = 0..113504] long_name: Delta Time standard_name: time units: sec source: ATL13 ATBD, Table 5-4b contentType: physicalMeasurement description: Time of the short segment (mean of signal class >=2 ph time). coordinates: anom_sseg_lat anom_sseg_lon origname: anom_sseg_time fullnamepath: /gt1l/anom_ssegs/anom_sseg_time |
| gt1l_delta_time: | Array of 64 bit Reals [gt1l_delta_time = 0..223696] long_name: Delta Time standard_name: time units: seconds since 2018-01-01 source: ATL03 contentType: physicalMeasurement 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. coordinates: segment_lat segment_lon origname: delta_time fullnamepath: /gt1l/delta_time |
| gt1r_anom_ssegs_anom_sseg_time: | Array of 64 bit Reals [gt1r_anom_ssegs_anom_sseg_time = 0..27992] long_name: Delta Time standard_name: time units: sec source: ATL13 ATBD, Table 5-4b contentType: physicalMeasurement description: Time of the short segment (mean of signal class >=2 ph time). coordinates: anom_sseg_lat anom_sseg_lon origname: anom_sseg_time fullnamepath: /gt1r/anom_ssegs/anom_sseg_time |
| gt1r_delta_time: | Array of 64 bit Reals [gt1r_delta_time = 0..50001] long_name: Delta Time standard_name: time units: seconds since 2018-01-01 source: ATL03 contentType: physicalMeasurement 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. coordinates: segment_lat segment_lon origname: delta_time fullnamepath: /gt1r/delta_time |
| gt2l_anom_ssegs_anom_sseg_time: | Array of 64 bit Reals [gt2l_anom_ssegs_anom_sseg_time = 0..60820] long_name: Delta Time standard_name: time units: sec source: ATL13 ATBD, Table 5-4b contentType: physicalMeasurement description: Time of the short segment (mean of signal class >=2 ph time). coordinates: anom_sseg_lat anom_sseg_lon origname: anom_sseg_time fullnamepath: /gt2l/anom_ssegs/anom_sseg_time |
| gt2l_delta_time: | Array of 64 bit Reals [gt2l_delta_time = 0..191958] long_name: Delta Time standard_name: time units: seconds since 2018-01-01 source: ATL03 contentType: physicalMeasurement 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. coordinates: segment_lat segment_lon origname: delta_time fullnamepath: /gt2l/delta_time |
| gt2r_anom_ssegs_anom_sseg_time: | Array of 64 bit Reals [gt2r_anom_ssegs_anom_sseg_time = 0..36865] long_name: Delta Time standard_name: time units: sec source: ATL13 ATBD, Table 5-4b contentType: physicalMeasurement description: Time of the short segment (mean of signal class >=2 ph time). coordinates: anom_sseg_lat anom_sseg_lon origname: anom_sseg_time fullnamepath: /gt2r/anom_ssegs/anom_sseg_time |
| gt2r_delta_time: | Array of 64 bit Reals [gt2r_delta_time = 0..60233] long_name: Delta Time standard_name: time units: seconds since 2018-01-01 source: ATL03 contentType: physicalMeasurement 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. coordinates: segment_lat segment_lon origname: delta_time fullnamepath: /gt2r/delta_time |
| gt3l_anom_ssegs_anom_sseg_time: | Array of 64 bit Reals [gt3l_anom_ssegs_anom_sseg_time = 0..105767] long_name: Delta Time standard_name: time units: sec source: ATL13 ATBD, Table 5-4b contentType: physicalMeasurement description: Time of the short segment (mean of signal class >=2 ph time). coordinates: anom_sseg_lat anom_sseg_lon origname: anom_sseg_time fullnamepath: /gt3l/anom_ssegs/anom_sseg_time |
| gt3l_delta_time: | Array of 64 bit Reals [gt3l_delta_time = 0..221604] long_name: Delta Time standard_name: time units: seconds since 2018-01-01 source: ATL03 contentType: physicalMeasurement 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. coordinates: segment_lat segment_lon origname: delta_time fullnamepath: /gt3l/delta_time |
| gt3r_anom_ssegs_anom_sseg_time: | Array of 64 bit Reals [gt3r_anom_ssegs_anom_sseg_time = 0..27494] long_name: Delta Time standard_name: time units: sec source: ATL13 ATBD, Table 5-4b contentType: physicalMeasurement description: Time of the short segment (mean of signal class >=2 ph time). coordinates: anom_sseg_lat anom_sseg_lon origname: anom_sseg_time fullnamepath: /gt3r/anom_ssegs/anom_sseg_time |
| gt3r_delta_time: | Array of 64 bit Reals [gt3r_delta_time = 0..52146] long_name: Delta Time standard_name: time units: seconds since 2018-01-01 source: ATL03 contentType: physicalMeasurement 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. coordinates: segment_lat segment_lon origname: delta_time fullnamepath: /gt3r/delta_time |
| orbit_info_crossing_time: | Array of 64 bit Reals [orbit_info_crossing_time = 0..3] long_name: Ascending Node Crossing Time standard_name: time units: seconds since 2018-01-01 source: POD/PPD contentType: referenceInformation 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. 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] long_name: Time of Last Spacecraft Orientation Change standard_name: time units: seconds since 2018-01-01 source: POD/PPD contentType: referenceInformation 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. origname: sc_orient_time fullnamepath: /orbit_info/sc_orient_time |
| FakeDim0: | Array of 32 bit Integers [FakeDim0 = 0..0] units: level |
| FakeDim1: | Array of 32 bit Integers [FakeDim1 = 0..8] units: level |
| FakeDim10: | Array of 32 bit Integers [FakeDim10 = 0..8] units: level |
| FakeDim11: | Array of 32 bit Integers [FakeDim11 = 0..11] units: level |
| FakeDim2: | Array of 32 bit Integers [FakeDim2 = 0..2] units: level |
| FakeDim3: | Array of 32 bit Integers [FakeDim3 = 0..1] units: level |
| FakeDim5: | Array of 32 bit Integers [FakeDim5 = 0..8] units: level |
| FakeDim7: | Array of 32 bit Integers [FakeDim7 = 0..8] units: level |
| FakeDim8: | Array of 32 bit Integers [FakeDim8 = 0..5] units: level |