4.0 2.0 ATL24_20241107234251_08052501_006_01_002_01.h5 /data/NASAFILES/hdf5/ATL24_20241107234251_08052501_006_01_002_01.h5 ancillary_data_atlas_sdp_gps_epoch contentType String auxiliaryInformation description String 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. long_name String ATLAS Epoch Offset source String Operations units String seconds since 1980-01-06T00:00:00.000000Z origname String atlas_sdp_gps_epoch fullnamepath String /ancillary_data/atlas_sdp_gps_epoch ancillary_data_data_end_utc contentType String auxiliaryInformation description String UTC (in CCSDS-A format) of the last data point within the granule. long_name String End UTC Time of Granule (CCSDS-A, Actual) source String Derived units String 1 origname String data_end_utc fullnamepath String /ancillary_data/data_end_utc ancillary_data_data_start_utc contentType String auxiliaryInformation description String UTC (in CCSDS-A format) of the first data point within the granule. long_name String Start UTC Time of Granule (CCSDS-A, Actual) source String Derived units String 1 origname String data_start_utc fullnamepath String /ancillary_data/data_start_utc ancillary_data_end_cycle contentType String auxiliaryInformation source String Derived description String 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. long_name String Ending Cycle units String 1 origname String end_cycle fullnamepath String /ancillary_data/end_cycle ancillary_data_end_delta_time contentType String auxiliaryInformation description String 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. long_name String ATLAS End Time (Actual) source String Derived units String seconds since 2018-01-01 standard_name String time origname String end_delta_time fullnamepath String /ancillary_data/end_delta_time ancillary_data_end_geoseg contentType String auxiliaryInformation description String 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. long_name String Ending Geolocation Segment source String Derived units String 1 origname String end_geoseg fullnamepath String /ancillary_data/end_geoseg ancillary_data_end_gpssow contentType String auxiliaryInformation description String GPS seconds-of-week of the last data point in the granule. long_name String Ending GPS SOW of Granule (Actual) source String Derived units String seconds origname String end_gpssow fullnamepath String /ancillary_data/end_gpssow ancillary_data_end_gpsweek contentType String auxiliaryInformation description String GPS week number of the last data point in the granule. long_name String Ending GPSWeek of Granule (Actual) source String Derived units String weeks from 1980-01-06 origname String end_gpsweek fullnamepath String /ancillary_data/end_gpsweek ancillary_data_end_orbit contentType String auxiliaryInformation source String Derived description String 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. long_name String Ending Orbit Number units String 1 origname String end_orbit fullnamepath String /ancillary_data/end_orbit ancillary_data_end_region contentType String auxiliaryInformation description String 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. long_name String Ending Region source String Derived units String 1 origname String end_region fullnamepath String /ancillary_data/end_region ancillary_data_end_rgt contentType String auxiliaryInformation source String Derived description String 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. long_name String Ending Reference Groundtrack units String 1 origname String end_rgt fullnamepath String /ancillary_data/end_rgt ancillary_data_granule_end_utc contentType String auxiliaryInformation description String Requested end time (in UTC CCSDS-A) of this granule. long_name String End UTC Time of Granule (CCSDS-A, Requested) source String Derived units String 1 origname String granule_end_utc fullnamepath String /ancillary_data/granule_end_utc ancillary_data_granule_start_utc contentType String auxiliaryInformation description String Requested start time (in UTC CCSDS-A) of this granule. source String Derived long_name String Start UTC Time of Granule (CCSDS-A, Requested) units String 1 origname String granule_start_utc fullnamepath String /ancillary_data/granule_start_utc ancillary_data_release contentType String auxiliaryInformation description String Release number of the granule. The release number is incremented when the software or ancillary data used to create the granule has been changed. long_name String Release Number source String Operations units String 1 origname String release fullnamepath String /ancillary_data/release ancillary_data_resource contentType String auxiliaryInformation description String ATL03 granule used to produce this granule long_name String ATL03 Resource source String Operations units String 1 origname String resource fullnamepath String /ancillary_data/resource ancillary_data_sliderule_commit contentType String auxiliaryInformation source String Operations description String Git commit ID (https://github.com/SlideRuleEarth/sliderule.git) of SlideRule software used to generate this granule long_name String SlideRule Commit units String 1 origname String sliderule_commit fullnamepath String /ancillary_data/sliderule_commit ancillary_data_sliderule_environment contentType String auxiliaryInformation description String Git commit ID (https://github.com/SlideRuleEarth/sliderule.git) of SlideRule environment used to generate this granule long_name String SlideRule Environment source String Operations units String 1 origname String sliderule_environment fullnamepath String /ancillary_data/sliderule_environment ancillary_data_sliderule_version contentType String auxiliaryInformation description String Version of SlideRule software used to generate this granule long_name String SlideRule Version source String Operations units String 1 origname String sliderule_version fullnamepath String /ancillary_data/sliderule_version ancillary_data_start_cycle contentType String auxiliaryInformation description String 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. long_name String Starting Cycle source String Derived units String 1 origname String start_cycle fullnamepath String /ancillary_data/start_cycle ancillary_data_start_delta_time contentType String auxiliaryInformation source String Derived description String 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. long_name String ATLAS Start Time (Actual) units String seconds since 2018-01-01 origname String start_delta_time fullnamepath String /ancillary_data/start_delta_time ancillary_data_start_geoseg contentType String auxiliaryInformation long_name String Starting Geolocation Segment source String Derived description String 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. units String 1 origname String start_geoseg fullnamepath String /ancillary_data/start_geoseg ancillary_data_start_gpssow contentType String auxiliaryInformation description String GPS seconds-of-week of the first data point in the granule. long_name String Start GPS SOW of Granule (Actual) source String Derived units String seconds origname String start_gpssow fullnamepath String /ancillary_data/start_gpssow ancillary_data_start_gpsweek contentType String auxiliaryInformation description String GPS week number of the first data point in the granule. long_name String Start GPSWeek of Granule (Actual) source String Derived units String weeks from 1980-01-06 origname String start_gpsweek fullnamepath String /ancillary_data/start_gpsweek ancillary_data_start_orbit contentType String auxiliaryInformation description String 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. long_name String Starting Orbit Number source String Derived units String 1 origname String start_orbit fullnamepath String /ancillary_data/start_orbit ancillary_data_start_region contentType String auxiliaryInformation source String Derived description String 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. long_name String Starting Region units String 1 origname String start_region fullnamepath String /ancillary_data/start_region ancillary_data_start_rgt contentType String auxiliaryInformation description String 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. long_name String Starting Reference Groundtrack source String Derived units String 1 origname String start_rgt fullnamepath String /ancillary_data/start_rgt ancillary_data_version contentType String auxiliaryInformation description String 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. long_name String Version source String Operations units String 1 origname String version fullnamepath String /ancillary_data/version gt1l_class_ph 188588 contentType String modelResults description String 0 - unclassified, 1 - other, 40 - bathymetry, 41 - sea surface long_name String Photon classification source String ATL03 units String scalar origname String class_ph fullnamepath String /gt1l/class_ph coordinates String gt1l_delta_time gt1l_lat_ph gt1l_lon_ph gt1l_confidence 188588 contentType String modelResult description String ensemble confidence score from 0.0 to 1.0 where larger numbers represent higher confidence in classification long_name String Ensemble confidence source String ATL03 units String scalar origname String confidence fullnamepath String /gt1l/confidence coordinates String gt1l_delta_time gt1l_lat_ph gt1l_lon_ph gt1l_delta_time 188588 contentType String physicalMeasurement description String The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name String Elapsed GPS seconds source String ATL03 units String seconds since 2018-01-01 origname String delta_time fullnamepath String /gt1l/delta_time coordinates String gt1l_lat_ph gt1l_lon_ph gt1l_ellipse_h 188588 contentType String physicalMeasurement long_name String Photon WGS84 height source String ATL03 units String meters description String Height of each received photon, relative to the WGS-84 ellipsoid including refraction correction. Note neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights. origname String ellipse_h fullnamepath String /gt1l/ellipse_h coordinates String gt1l_delta_time gt1l_lat_ph gt1l_lon_ph gt1l_index_ph 188588 contentType String physicalMeasurement description String 0-based index of the photon in the ATL03 heights group long_name String Photon index source String ATL03 units String scalar origname String index_ph fullnamepath String /gt1l/index_ph coordinates String gt1l_delta_time gt1l_lat_ph gt1l_lon_ph gt1l_index_seg 188588 contentType String physicalMeasurement description String 0-based index of the photon in the ATL03 geolocation group long_name String Segment index source String ATL03 units String scalar origname String index_seg fullnamepath String /gt1l/index_seg coordinates String gt1l_delta_time gt1l_lat_ph gt1l_lon_ph gt1l_invalid_kd 188588 contentType String modelResult long_name String Invalid Kd description String Indicates that no data was available in the VIIRS Kd490 8-day cycle dataset at the time and location of the photon source String VIIRS Kd490 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String invalid_kd fullnamepath String /gt1l/invalid_kd coordinates String gt1l_delta_time gt1l_lat_ph gt1l_lon_ph gt1l_invalid_wind_speed 188588 contentType String modelResult description String Indicates that ATL09 data was not able to be read to determine wind speed long_name String Invalid wind speed source String ATL09 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String invalid_wind_speed fullnamepath String /gt1l/invalid_wind_speed coordinates String gt1l_delta_time gt1l_lat_ph gt1l_lon_ph gt1l_lat_ph 188588 contentType String modelResult long_name String Latitude units String degrees_north standard_name String latitude valid_max Float64 90.000000000000000 valid_min Float64 -90.000000000000000 description String Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. source String ATL03 origname String lat_ph fullnamepath String /gt1l/lat_ph coordinates String gt1l_delta_time gt1l_lon_ph gt1l_lon_ph 188588 contentType String modelResult description String Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name String Longitude source String ATL03 units String degrees_east standard_name String longitude valid_max Float64 180.00000000000000 valid_min Float64 -180.00000000000000 origname String lon_ph fullnamepath String /gt1l/lon_ph coordinates String gt1l_delta_time gt1l_lat_ph gt1l_low_confidence_flag 188588 contentType String modelResult source String ATL03 description String There is low confidence that the photon classified as bathymetry is actually bathymetry units String boolean long_name String Low confidence bathymetry flag flag_meanings String false, true flag_values String 0, 1 origname String low_confidence_flag fullnamepath String /gt1l/low_confidence_flag coordinates String gt1l_delta_time gt1l_lat_ph gt1l_lon_ph gt1l_night_flag 188588 contentType String modelResult description String The solar elevation was less than 5 degrees at the time and location of the photon long_name String Night flag source String ATL03 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String night_flag fullnamepath String /gt1l/night_flag coordinates String gt1l_delta_time gt1l_lat_ph gt1l_lon_ph gt1l_ortho_h 188588 contentType String physicalMeasurement description String Height of each received photon, relative to the geoid. long_name String Orthometric height source String ATL03 units String meters origname String ortho_h fullnamepath String /gt1l/ortho_h coordinates String gt1l_delta_time gt1l_lat_ph gt1l_lon_ph gt1l_sensor_depth_exceeded 188588 contentType String modelResult description String The subaqueous photon is below the maximum depth detectable by the ATLAS sensor given the Kd of the water column long_name String Sensor depth exceeded source String ATL03 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String sensor_depth_exceeded fullnamepath String /gt1l/sensor_depth_exceeded coordinates String gt1l_delta_time gt1l_lat_ph gt1l_lon_ph gt1l_sigma_thu 188588 contentType String physicalMeasurement description String The combination of the aerial and subaqueous horizontal uncertainty for each received photon long_name String Total horizontal uncertainty source String ATL03 units String meters origname String sigma_thu fullnamepath String /gt1l/sigma_thu coordinates String gt1l_delta_time gt1l_lat_ph gt1l_lon_ph gt1l_sigma_tvu 188588 contentType String modelResult description String The combination of the aerial and subaqueous vertical uncertainty for each received photon long_name String Total vertical uncertainty source String ATL03 units String meters origname String sigma_tvu fullnamepath String /gt1l/sigma_tvu coordinates String gt1l_delta_time gt1l_lat_ph gt1l_lon_ph gt1l_surface_h 188588 contentType String modelResult description String The geoid corrected height of the sea surface at the detected photon long_name String Sea surface orthometric height source String ATL03 units String meters origname String surface_h fullnamepath String /gt1l/surface_h coordinates String gt1l_delta_time gt1l_lat_ph gt1l_lon_ph gt1l_x_atc 188588 contentType String modelResult description String Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack. long_name String Distance from equator crossing source String ATL03 units String meters origname String x_atc fullnamepath String /gt1l/x_atc coordinates String gt1l_delta_time gt1l_lat_ph gt1l_lon_ph gt1l_y_atc 188588 contentType String modelResult description String Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1 of the ATBD. long_name String Distance off RGT source String ATL03 units String meters origname String y_atc fullnamepath String /gt1l/y_atc coordinates String gt1l_delta_time gt1l_lat_ph gt1l_lon_ph gt1r_class_ph 36268 contentType String modelResults description String 0 - unclassified, 1 - other, 40 - bathymetry, 41 - sea surface long_name String Photon classification source String ATL03 units String scalar origname String class_ph fullnamepath String /gt1r/class_ph coordinates String gt1r_delta_time gt1r_lat_ph gt1r_lon_ph gt1r_confidence 36268 contentType String modelResult description String ensemble confidence score from 0.0 to 1.0 where larger numbers represent higher confidence in classification long_name String Ensemble confidence source String ATL03 units String scalar origname String confidence fullnamepath String /gt1r/confidence coordinates String gt1r_delta_time gt1r_lat_ph gt1r_lon_ph gt1r_delta_time 36268 contentType String physicalMeasurement description String The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name String Elapsed GPS seconds source String ATL03 units String seconds since 2018-01-01 origname String delta_time fullnamepath String /gt1r/delta_time coordinates String gt1r_lat_ph gt1r_lon_ph gt1r_ellipse_h 36268 contentType String physicalMeasurement description String Height of each received photon, relative to the WGS-84 ellipsoid including refraction correction. Note neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights. long_name String Photon WGS84 height source String ATL03 units String meters origname String ellipse_h fullnamepath String /gt1r/ellipse_h coordinates String gt1r_delta_time gt1r_lat_ph gt1r_lon_ph gt1r_index_ph 36268 contentType String physicalMeasurement description String 0-based index of the photon in the ATL03 heights group long_name String Photon index source String ATL03 units String scalar origname String index_ph fullnamepath String /gt1r/index_ph coordinates String gt1r_delta_time gt1r_lat_ph gt1r_lon_ph gt1r_index_seg 36268 contentType String physicalMeasurement description String 0-based index of the photon in the ATL03 geolocation group long_name String Segment index source String ATL03 units String scalar origname String index_seg fullnamepath String /gt1r/index_seg coordinates String gt1r_delta_time gt1r_lat_ph gt1r_lon_ph gt1r_invalid_kd 36268 contentType String modelResult description String Indicates that no data was available in the VIIRS Kd490 8-day cycle dataset at the time and location of the photon long_name String Invalid Kd source String VIIRS Kd490 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String invalid_kd fullnamepath String /gt1r/invalid_kd coordinates String gt1r_delta_time gt1r_lat_ph gt1r_lon_ph gt1r_invalid_wind_speed 36268 contentType String modelResult description String Indicates that ATL09 data was not able to be read to determine wind speed long_name String Invalid wind speed source String ATL09 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String invalid_wind_speed fullnamepath String /gt1r/invalid_wind_speed coordinates String gt1r_delta_time gt1r_lat_ph gt1r_lon_ph gt1r_lat_ph 36268 contentType String modelResult description String Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name String Latitude source String ATL03 units String degrees_north standard_name String latitude valid_max Float64 90.000000000000000 valid_min Float64 -90.000000000000000 origname String lat_ph fullnamepath String /gt1r/lat_ph coordinates String gt1r_delta_time gt1r_lon_ph gt1r_lon_ph 36268 contentType String modelResult description String Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name String Longitude source String ATL03 units String degrees_east standard_name String longitude valid_max Float64 180.00000000000000 valid_min Float64 -180.00000000000000 origname String lon_ph fullnamepath String /gt1r/lon_ph coordinates String gt1r_delta_time gt1r_lat_ph gt1r_low_confidence_flag 36268 contentType String modelResult source String ATL03 description String There is low confidence that the photon classified as bathymetry is actually bathymetry long_name String Low confidence bathymetry flag units String boolean flag_meanings String false, true flag_values String 0, 1 origname String low_confidence_flag fullnamepath String /gt1r/low_confidence_flag coordinates String gt1r_delta_time gt1r_lat_ph gt1r_lon_ph gt1r_night_flag 36268 contentType String modelResult description String The solar elevation was less than 5 degrees at the time and location of the photon long_name String Night flag source String ATL03 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String night_flag fullnamepath String /gt1r/night_flag coordinates String gt1r_delta_time gt1r_lat_ph gt1r_lon_ph gt1r_ortho_h 36268 contentType String physicalMeasurement description String Height of each received photon, relative to the geoid. long_name String Orthometric height source String ATL03 units String meters origname String ortho_h fullnamepath String /gt1r/ortho_h coordinates String gt1r_delta_time gt1r_lat_ph gt1r_lon_ph gt1r_sensor_depth_exceeded 36268 contentType String modelResult description String The subaqueous photon is below the maximum depth detectable by the ATLAS sensor given the Kd of the water column long_name String Sensor depth exceeded source String ATL03 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String sensor_depth_exceeded fullnamepath String /gt1r/sensor_depth_exceeded coordinates String gt1r_delta_time gt1r_lat_ph gt1r_lon_ph gt1r_sigma_thu 36268 contentType String physicalMeasurement description String The combination of the aerial and subaqueous horizontal uncertainty for each received photon long_name String Total horizontal uncertainty source String ATL03 units String meters origname String sigma_thu fullnamepath String /gt1r/sigma_thu coordinates String gt1r_delta_time gt1r_lat_ph gt1r_lon_ph gt1r_sigma_tvu 36268 contentType String modelResult description String The combination of the aerial and subaqueous vertical uncertainty for each received photon long_name String Total vertical uncertainty source String ATL03 units String meters origname String sigma_tvu fullnamepath String /gt1r/sigma_tvu coordinates String gt1r_delta_time gt1r_lat_ph gt1r_lon_ph gt1r_surface_h 36268 contentType String modelResult description String The geoid corrected height of the sea surface at the detected photon long_name String Sea surface orthometric height source String ATL03 units String meters origname String surface_h fullnamepath String /gt1r/surface_h coordinates String gt1r_delta_time gt1r_lat_ph gt1r_lon_ph gt1r_x_atc 36268 contentType String modelResult description String Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack. long_name String Distance from equator crossing source String ATL03 units String meters origname String x_atc fullnamepath String /gt1r/x_atc coordinates String gt1r_delta_time gt1r_lat_ph gt1r_lon_ph gt1r_y_atc 36268 contentType String modelResult description String Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1 of the ATBD. long_name String Distance off RGT source String ATL03 units String meters origname String y_atc fullnamepath String /gt1r/y_atc coordinates String gt1r_delta_time gt1r_lat_ph gt1r_lon_ph gt2l_class_ph 106047 contentType String modelResults description String 0 - unclassified, 1 - other, 40 - bathymetry, 41 - sea surface long_name String Photon classification source String ATL03 units String scalar origname String class_ph fullnamepath String /gt2l/class_ph coordinates String gt2l_delta_time gt2l_lat_ph gt2l_lon_ph gt2l_confidence 106047 contentType String modelResult description String ensemble confidence score from 0.0 to 1.0 where larger numbers represent higher confidence in classification long_name String Ensemble confidence source String ATL03 units String scalar origname String confidence fullnamepath String /gt2l/confidence coordinates String gt2l_delta_time gt2l_lat_ph gt2l_lon_ph gt2l_delta_time 106047 contentType String physicalMeasurement description String The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name String Elapsed GPS seconds source String ATL03 units String seconds since 2018-01-01 origname String delta_time fullnamepath String /gt2l/delta_time coordinates String gt2l_lat_ph gt2l_lon_ph gt2l_ellipse_h 106047 contentType String physicalMeasurement description String Height of each received photon, relative to the WGS-84 ellipsoid including refraction correction. Note neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights. long_name String Photon WGS84 height source String ATL03 units String meters origname String ellipse_h fullnamepath String /gt2l/ellipse_h coordinates String gt2l_delta_time gt2l_lat_ph gt2l_lon_ph gt2l_index_ph 106047 contentType String physicalMeasurement description String 0-based index of the photon in the ATL03 heights group long_name String Photon index source String ATL03 units String scalar origname String index_ph fullnamepath String /gt2l/index_ph coordinates String gt2l_delta_time gt2l_lat_ph gt2l_lon_ph gt2l_index_seg 106047 contentType String physicalMeasurement description String 0-based index of the photon in the ATL03 geolocation group long_name String Segment index source String ATL03 units String scalar origname String index_seg fullnamepath String /gt2l/index_seg coordinates String gt2l_delta_time gt2l_lat_ph gt2l_lon_ph gt2l_invalid_kd 106047 contentType String modelResult description String Indicates that no data was available in the VIIRS Kd490 8-day cycle dataset at the time and location of the photon long_name String Invalid Kd source String VIIRS Kd490 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String invalid_kd fullnamepath String /gt2l/invalid_kd coordinates String gt2l_delta_time gt2l_lat_ph gt2l_lon_ph gt2l_invalid_wind_speed 106047 contentType String modelResult description String Indicates that ATL09 data was not able to be read to determine wind speed long_name String Invalid wind speed source String ATL09 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String invalid_wind_speed fullnamepath String /gt2l/invalid_wind_speed coordinates String gt2l_delta_time gt2l_lat_ph gt2l_lon_ph gt2l_lat_ph 106047 contentType String modelResult description String Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name String Latitude source String ATL03 units String degrees_north standard_name String latitude valid_max Float64 90.000000000000000 valid_min Float64 -90.000000000000000 origname String lat_ph fullnamepath String /gt2l/lat_ph coordinates String gt2l_delta_time gt2l_lon_ph gt2l_lon_ph 106047 contentType String modelResult description String Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name String Longitude source String ATL03 units String degrees_east standard_name String longitude valid_max Float64 180.00000000000000 valid_min Float64 -180.00000000000000 origname String lon_ph fullnamepath String /gt2l/lon_ph coordinates String gt2l_delta_time gt2l_lat_ph gt2l_low_confidence_flag 106047 contentType String modelResult source String ATL03 description String There is low confidence that the photon classified as bathymetry is actually bathymetry long_name String Low confidence bathymetry flag units String boolean flag_meanings String false, true flag_values String 0, 1 origname String low_confidence_flag fullnamepath String /gt2l/low_confidence_flag coordinates String gt2l_delta_time gt2l_lat_ph gt2l_lon_ph gt2l_night_flag 106047 contentType String modelResult description String The solar elevation was less than 5 degrees at the time and location of the photon long_name String Night flag source String ATL03 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String night_flag fullnamepath String /gt2l/night_flag coordinates String gt2l_delta_time gt2l_lat_ph gt2l_lon_ph gt2l_ortho_h 106047 contentType String physicalMeasurement description String Height of each received photon, relative to the geoid. long_name String Orthometric height source String ATL03 units String meters origname String ortho_h fullnamepath String /gt2l/ortho_h coordinates String gt2l_delta_time gt2l_lat_ph gt2l_lon_ph gt2l_sensor_depth_exceeded 106047 contentType String modelResult description String The subaqueous photon is below the maximum depth detectable by the ATLAS sensor given the Kd of the water column long_name String Sensor depth exceeded source String ATL03 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String sensor_depth_exceeded fullnamepath String /gt2l/sensor_depth_exceeded coordinates String gt2l_delta_time gt2l_lat_ph gt2l_lon_ph gt2l_sigma_thu 106047 contentType String physicalMeasurement description String The combination of the aerial and subaqueous horizontal uncertainty for each received photon long_name String Total horizontal uncertainty source String ATL03 units String meters origname String sigma_thu fullnamepath String /gt2l/sigma_thu coordinates String gt2l_delta_time gt2l_lat_ph gt2l_lon_ph gt2l_sigma_tvu 106047 contentType String modelResult description String The combination of the aerial and subaqueous vertical uncertainty for each received photon long_name String Total vertical uncertainty source String ATL03 units String meters origname String sigma_tvu fullnamepath String /gt2l/sigma_tvu coordinates String gt2l_delta_time gt2l_lat_ph gt2l_lon_ph gt2l_surface_h 106047 contentType String modelResult description String The geoid corrected height of the sea surface at the detected photon long_name String Sea surface orthometric height source String ATL03 units String meters origname String surface_h fullnamepath String /gt2l/surface_h coordinates String gt2l_delta_time gt2l_lat_ph gt2l_lon_ph gt2l_x_atc 106047 contentType String modelResult description String Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack. long_name String Distance from equator crossing source String ATL03 units String meters origname String x_atc fullnamepath String /gt2l/x_atc coordinates String gt2l_delta_time gt2l_lat_ph gt2l_lon_ph gt2l_y_atc 106047 contentType String modelResult description String Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1 of the ATBD. long_name String Distance off RGT source String ATL03 units String meters origname String y_atc fullnamepath String /gt2l/y_atc coordinates String gt2l_delta_time gt2l_lat_ph gt2l_lon_ph gt2r_class_ph 29729 contentType String modelResults description String 0 - unclassified, 1 - other, 40 - bathymetry, 41 - sea surface long_name String Photon classification source String ATL03 units String scalar origname String class_ph fullnamepath String /gt2r/class_ph coordinates String gt2r_delta_time gt2r_lat_ph gt2r_lon_ph gt2r_confidence 29729 contentType String modelResult description String ensemble confidence score from 0.0 to 1.0 where larger numbers represent higher confidence in classification long_name String Ensemble confidence source String ATL03 units String scalar origname String confidence fullnamepath String /gt2r/confidence coordinates String gt2r_delta_time gt2r_lat_ph gt2r_lon_ph gt2r_delta_time 29729 contentType String physicalMeasurement description String The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name String Elapsed GPS seconds source String ATL03 units String seconds since 2018-01-01 origname String delta_time fullnamepath String /gt2r/delta_time coordinates String gt2r_lat_ph gt2r_lon_ph gt2r_ellipse_h 29729 contentType String physicalMeasurement description String Height of each received photon, relative to the WGS-84 ellipsoid including refraction correction. Note neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights. long_name String Photon WGS84 height source String ATL03 units String meters origname String ellipse_h fullnamepath String /gt2r/ellipse_h coordinates String gt2r_delta_time gt2r_lat_ph gt2r_lon_ph gt2r_index_ph 29729 contentType String physicalMeasurement description String 0-based index of the photon in the ATL03 heights group long_name String Photon index source String ATL03 units String scalar origname String index_ph fullnamepath String /gt2r/index_ph coordinates String gt2r_delta_time gt2r_lat_ph gt2r_lon_ph gt2r_index_seg 29729 contentType String physicalMeasurement description String 0-based index of the photon in the ATL03 geolocation group long_name String Segment index source String ATL03 units String scalar origname String index_seg fullnamepath String /gt2r/index_seg coordinates String gt2r_delta_time gt2r_lat_ph gt2r_lon_ph gt2r_invalid_kd 29729 contentType String modelResult description String Indicates that no data was available in the VIIRS Kd490 8-day cycle dataset at the time and location of the photon long_name String Invalid Kd source String VIIRS Kd490 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String invalid_kd fullnamepath String /gt2r/invalid_kd coordinates String gt2r_delta_time gt2r_lat_ph gt2r_lon_ph gt2r_invalid_wind_speed 29729 contentType String modelResult description String Indicates that ATL09 data was not able to be read to determine wind speed long_name String Invalid wind speed source String ATL09 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String invalid_wind_speed fullnamepath String /gt2r/invalid_wind_speed coordinates String gt2r_delta_time gt2r_lat_ph gt2r_lon_ph gt2r_lat_ph 29729 contentType String modelResult description String Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name String Latitude source String ATL03 units String degrees_north standard_name String latitude valid_max Float64 90.000000000000000 valid_min Float64 -90.000000000000000 origname String lat_ph fullnamepath String /gt2r/lat_ph coordinates String gt2r_delta_time gt2r_lon_ph gt2r_lon_ph 29729 contentType String modelResult description String Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name String Longitude source String ATL03 units String degrees_east standard_name String longitude valid_max Float64 180.00000000000000 valid_min Float64 -180.00000000000000 origname String lon_ph fullnamepath String /gt2r/lon_ph coordinates String gt2r_delta_time gt2r_lat_ph gt2r_low_confidence_flag 29729 contentType String modelResult source String ATL03 description String There is low confidence that the photon classified as bathymetry is actually bathymetry long_name String Low confidence bathymetry flag units String boolean flag_meanings String false, true flag_values String 0, 1 origname String low_confidence_flag fullnamepath String /gt2r/low_confidence_flag coordinates String gt2r_delta_time gt2r_lat_ph gt2r_lon_ph gt2r_night_flag 29729 contentType String modelResult description String The solar elevation was less than 5 degrees at the time and location of the photon long_name String Night flag source String ATL03 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String night_flag fullnamepath String /gt2r/night_flag coordinates String gt2r_delta_time gt2r_lat_ph gt2r_lon_ph gt2r_ortho_h 29729 contentType String physicalMeasurement description String Height of each received photon, relative to the geoid. long_name String Orthometric height source String ATL03 units String meters origname String ortho_h fullnamepath String /gt2r/ortho_h coordinates String gt2r_delta_time gt2r_lat_ph gt2r_lon_ph gt2r_sensor_depth_exceeded 29729 contentType String modelResult description String The subaqueous photon is below the maximum depth detectable by the ATLAS sensor given the Kd of the water column long_name String Sensor depth exceeded source String ATL03 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String sensor_depth_exceeded fullnamepath String /gt2r/sensor_depth_exceeded coordinates String gt2r_delta_time gt2r_lat_ph gt2r_lon_ph gt2r_sigma_thu 29729 contentType String physicalMeasurement description String The combination of the aerial and subaqueous horizontal uncertainty for each received photon long_name String Total horizontal uncertainty source String ATL03 units String meters origname String sigma_thu fullnamepath String /gt2r/sigma_thu coordinates String gt2r_delta_time gt2r_lat_ph gt2r_lon_ph gt2r_sigma_tvu 29729 contentType String modelResult description String The combination of the aerial and subaqueous vertical uncertainty for each received photon long_name String Total vertical uncertainty source String ATL03 units String meters origname String sigma_tvu fullnamepath String /gt2r/sigma_tvu coordinates String gt2r_delta_time gt2r_lat_ph gt2r_lon_ph gt2r_surface_h 29729 contentType String modelResult description String The geoid corrected height of the sea surface at the detected photon long_name String Sea surface orthometric height source String ATL03 units String meters origname String surface_h fullnamepath String /gt2r/surface_h coordinates String gt2r_delta_time gt2r_lat_ph gt2r_lon_ph gt2r_x_atc 29729 contentType String modelResult description String Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack. long_name String Distance from equator crossing source String ATL03 units String meters origname String x_atc fullnamepath String /gt2r/x_atc coordinates String gt2r_delta_time gt2r_lat_ph gt2r_lon_ph gt2r_y_atc 29729 contentType String modelResult description String Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1 of the ATBD. long_name String Distance off RGT source String ATL03 units String meters origname String y_atc fullnamepath String /gt2r/y_atc coordinates String gt2r_delta_time gt2r_lat_ph gt2r_lon_ph gt3l_class_ph 122728 contentType String modelResults description String 0 - unclassified, 1 - other, 40 - bathymetry, 41 - sea surface long_name String Photon classification source String ATL03 units String scalar origname String class_ph fullnamepath String /gt3l/class_ph coordinates String gt3l_delta_time gt3l_lat_ph gt3l_lon_ph gt3l_confidence 122728 contentType String modelResult description String ensemble confidence score from 0.0 to 1.0 where larger numbers represent higher confidence in classification long_name String Ensemble confidence source String ATL03 units String scalar origname String confidence fullnamepath String /gt3l/confidence coordinates String gt3l_delta_time gt3l_lat_ph gt3l_lon_ph gt3l_delta_time 122728 contentType String physicalMeasurement description String The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name String Elapsed GPS seconds source String ATL03 units String seconds since 2018-01-01 origname String delta_time fullnamepath String /gt3l/delta_time coordinates String gt3l_lat_ph gt3l_lon_ph gt3l_ellipse_h 122728 contentType String physicalMeasurement description String Height of each received photon, relative to the WGS-84 ellipsoid including refraction correction. Note neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights. long_name String Photon WGS84 height source String ATL03 units String meters origname String ellipse_h fullnamepath String /gt3l/ellipse_h coordinates String gt3l_delta_time gt3l_lat_ph gt3l_lon_ph gt3l_index_ph 122728 contentType String physicalMeasurement description String 0-based index of the photon in the ATL03 heights group long_name String Photon index source String ATL03 units String scalar origname String index_ph fullnamepath String /gt3l/index_ph coordinates String gt3l_delta_time gt3l_lat_ph gt3l_lon_ph gt3l_index_seg 122728 contentType String physicalMeasurement description String 0-based index of the photon in the ATL03 geolocation group long_name String Segment index source String ATL03 units String scalar origname String index_seg fullnamepath String /gt3l/index_seg coordinates String gt3l_delta_time gt3l_lat_ph gt3l_lon_ph gt3l_invalid_kd 122728 contentType String modelResult description String Indicates that no data was available in the VIIRS Kd490 8-day cycle dataset at the time and location of the photon long_name String Invalid Kd source String VIIRS Kd490 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String invalid_kd fullnamepath String /gt3l/invalid_kd coordinates String gt3l_delta_time gt3l_lat_ph gt3l_lon_ph gt3l_invalid_wind_speed 122728 contentType String modelResult description String Indicates that ATL09 data was not able to be read to determine wind speed long_name String Invalid wind speed source String ATL09 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String invalid_wind_speed fullnamepath String /gt3l/invalid_wind_speed coordinates String gt3l_delta_time gt3l_lat_ph gt3l_lon_ph gt3l_lat_ph 122728 contentType String modelResult description String Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name String Latitude source String ATL03 units String degrees_north standard_name String latitude valid_max Float64 90.000000000000000 valid_min Float64 -90.000000000000000 origname String lat_ph fullnamepath String /gt3l/lat_ph coordinates String gt3l_delta_time gt3l_lon_ph gt3l_lon_ph 122728 contentType String modelResult description String Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name String Longitude source String ATL03 units String degrees_east standard_name String longitude valid_max Float64 180.00000000000000 valid_min Float64 -180.00000000000000 origname String lon_ph fullnamepath String /gt3l/lon_ph coordinates String gt3l_delta_time gt3l_lat_ph gt3l_low_confidence_flag 122728 contentType String modelResult source String ATL03 description String There is low confidence that the photon classified as bathymetry is actually bathymetry long_name String Low confidence bathymetry flag units String boolean flag_meanings String false, true flag_values String 0, 1 origname String low_confidence_flag fullnamepath String /gt3l/low_confidence_flag coordinates String gt3l_delta_time gt3l_lat_ph gt3l_lon_ph gt3l_night_flag 122728 contentType String modelResult description String The solar elevation was less than 5 degrees at the time and location of the photon long_name String Night flag source String ATL03 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String night_flag fullnamepath String /gt3l/night_flag coordinates String gt3l_delta_time gt3l_lat_ph gt3l_lon_ph gt3l_ortho_h 122728 contentType String physicalMeasurement description String Height of each received photon, relative to the geoid. long_name String Orthometric height source String ATL03 units String meters origname String ortho_h fullnamepath String /gt3l/ortho_h coordinates String gt3l_delta_time gt3l_lat_ph gt3l_lon_ph gt3l_sensor_depth_exceeded 122728 contentType String modelResult description String The subaqueous photon is below the maximum depth detectable by the ATLAS sensor given the Kd of the water column long_name String Sensor depth exceeded source String ATL03 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String sensor_depth_exceeded fullnamepath String /gt3l/sensor_depth_exceeded coordinates String gt3l_delta_time gt3l_lat_ph gt3l_lon_ph gt3l_sigma_thu 122728 contentType String physicalMeasurement description String The combination of the aerial and subaqueous horizontal uncertainty for each received photon long_name String Total horizontal uncertainty source String ATL03 units String meters origname String sigma_thu fullnamepath String /gt3l/sigma_thu coordinates String gt3l_delta_time gt3l_lat_ph gt3l_lon_ph gt3l_sigma_tvu 122728 contentType String modelResult description String The combination of the aerial and subaqueous vertical uncertainty for each received photon long_name String Total vertical uncertainty source String ATL03 units String meters origname String sigma_tvu fullnamepath String /gt3l/sigma_tvu coordinates String gt3l_delta_time gt3l_lat_ph gt3l_lon_ph gt3l_surface_h 122728 contentType String modelResult description String The geoid corrected height of the sea surface at the detected photon long_name String Sea surface orthometric height source String ATL03 units String meters origname String surface_h fullnamepath String /gt3l/surface_h coordinates String gt3l_delta_time gt3l_lat_ph gt3l_lon_ph gt3l_x_atc 122728 contentType String modelResult description String Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack. long_name String Distance from equator crossing source String ATL03 units String meters origname String x_atc fullnamepath String /gt3l/x_atc coordinates String gt3l_delta_time gt3l_lat_ph gt3l_lon_ph gt3l_y_atc 122728 contentType String modelResult description String Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1 of the ATBD. long_name String Distance off RGT source String ATL03 units String meters origname String y_atc fullnamepath String /gt3l/y_atc coordinates String gt3l_delta_time gt3l_lat_ph gt3l_lon_ph gt3r_class_ph 29323 contentType String modelResults description String 0 - unclassified, 1 - other, 40 - bathymetry, 41 - sea surface long_name String Photon classification source String ATL03 units String scalar origname String class_ph fullnamepath String /gt3r/class_ph coordinates String gt3r_delta_time gt3r_lat_ph gt3r_lon_ph gt3r_confidence 29323 contentType String modelResult description String ensemble confidence score from 0.0 to 1.0 where larger numbers represent higher confidence in classification long_name String Ensemble confidence source String ATL03 units String scalar origname String confidence fullnamepath String /gt3r/confidence coordinates String gt3r_delta_time gt3r_lat_ph gt3r_lon_ph gt3r_delta_time 29323 contentType String physicalMeasurement description String The transmit time of a given photon, measured in seconds from the ATLAS Standard Data Product Epoch. Note that multiple received photons associated with a single transmit pulse will have the same delta_time. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. long_name String Elapsed GPS seconds source String ATL03 units String seconds since 2018-01-01 origname String delta_time fullnamepath String /gt3r/delta_time coordinates String gt3r_lat_ph gt3r_lon_ph gt3r_ellipse_h 29323 contentType String physicalMeasurement description String Height of each received photon, relative to the WGS-84 ellipsoid including refraction correction. Note neither the geoid, ocean tide nor the dynamic atmosphere (DAC) corrections are applied to the ellipsoidal heights. long_name String Photon WGS84 height source String ATL03 units String meters origname String ellipse_h fullnamepath String /gt3r/ellipse_h coordinates String gt3r_delta_time gt3r_lat_ph gt3r_lon_ph gt3r_index_ph 29323 contentType String physicalMeasurement description String 0-based index of the photon in the ATL03 heights group long_name String Photon index source String ATL03 units String scalar origname String index_ph fullnamepath String /gt3r/index_ph coordinates String gt3r_delta_time gt3r_lat_ph gt3r_lon_ph gt3r_index_seg 29323 contentType String physicalMeasurement description String 0-based index of the photon in the ATL03 geolocation group long_name String Segment index source String ATL03 units String scalar origname String index_seg fullnamepath String /gt3r/index_seg coordinates String gt3r_delta_time gt3r_lat_ph gt3r_lon_ph gt3r_invalid_kd 29323 contentType String modelResult description String Indicates that no data was available in the VIIRS Kd490 8-day cycle dataset at the time and location of the photon long_name String Invalid Kd source String VIIRS Kd490 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String invalid_kd fullnamepath String /gt3r/invalid_kd coordinates String gt3r_delta_time gt3r_lat_ph gt3r_lon_ph gt3r_invalid_wind_speed 29323 contentType String modelResult description String Indicates that ATL09 data was not able to be read to determine wind speed long_name String Invalid wind speed source String ATL09 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String invalid_wind_speed fullnamepath String /gt3r/invalid_wind_speed coordinates String gt3r_delta_time gt3r_lat_ph gt3r_lon_ph gt3r_lat_ph 29323 contentType String modelResult description String Latitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name String Latitude source String ATL03 units String degrees_north standard_name String latitude valid_max Float64 90.000000000000000 valid_min Float64 -90.000000000000000 origname String lat_ph fullnamepath String /gt3r/lat_ph coordinates String gt3r_delta_time gt3r_lon_ph gt3r_lon_ph 29323 contentType String modelResult description String Longitude of each received photon. Computed from the ECF Cartesian coordinates of the bounce point. long_name String Longitude source String ATL03 units String degrees_east standard_name String longitude valid_max Float64 180.00000000000000 valid_min Float64 -180.00000000000000 origname String lon_ph fullnamepath String /gt3r/lon_ph coordinates String gt3r_delta_time gt3r_lat_ph gt3r_low_confidence_flag 29323 contentType String modelResult source String ATL03 description String There is low confidence that the photon classified as bathymetry is actually bathymetry long_name String Low confidence bathymetry flag units String boolean flag_meanings String false, true flag_values String 0, 1 origname String low_confidence_flag fullnamepath String /gt3r/low_confidence_flag coordinates String gt3r_delta_time gt3r_lat_ph gt3r_lon_ph gt3r_night_flag 29323 contentType String modelResult description String The solar elevation was less than 5 degrees at the time and location of the photon long_name String Night flag source String ATL03 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String night_flag fullnamepath String /gt3r/night_flag coordinates String gt3r_delta_time gt3r_lat_ph gt3r_lon_ph gt3r_ortho_h 29323 contentType String physicalMeasurement description String Height of each received photon, relative to the geoid. long_name String Orthometric height source String ATL03 units String meters origname String ortho_h fullnamepath String /gt3r/ortho_h coordinates String gt3r_delta_time gt3r_lat_ph gt3r_lon_ph gt3r_sensor_depth_exceeded 29323 contentType String modelResult description String The subaqueous photon is below the maximum depth detectable by the ATLAS sensor given the Kd of the water column long_name String Sensor depth exceeded source String ATL03 units String boolean flag_meanings String false, true flag_values String 0, 1 origname String sensor_depth_exceeded fullnamepath String /gt3r/sensor_depth_exceeded coordinates String gt3r_delta_time gt3r_lat_ph gt3r_lon_ph gt3r_sigma_thu 29323 contentType String physicalMeasurement description String The combination of the aerial and subaqueous horizontal uncertainty for each received photon long_name String Total horizontal uncertainty source String ATL03 units String meters origname String sigma_thu fullnamepath String /gt3r/sigma_thu coordinates String gt3r_delta_time gt3r_lat_ph gt3r_lon_ph gt3r_sigma_tvu 29323 contentType String modelResult description String The combination of the aerial and subaqueous vertical uncertainty for each received photon long_name String Total vertical uncertainty source String ATL03 units String meters origname String sigma_tvu fullnamepath String /gt3r/sigma_tvu coordinates String gt3r_delta_time gt3r_lat_ph gt3r_lon_ph gt3r_surface_h 29323 contentType String modelResult description String The geoid corrected height of the sea surface at the detected photon long_name String Sea surface orthometric height source String ATL03 units String meters origname String surface_h fullnamepath String /gt3r/surface_h coordinates String gt3r_delta_time gt3r_lat_ph gt3r_lon_ph gt3r_x_atc 29323 contentType String modelResult description String Along-track distance in a segment projected to the ellipsoid of the received photon, based on the Along-Track Segment algorithm. Total along track distance can be found by adding this value to the sum of segment lengths measured from the start of the most recent reference groundtrack. long_name String Distance from equator crossing source String ATL03 units String meters origname String x_atc fullnamepath String /gt3r/x_atc coordinates String gt3r_delta_time gt3r_lat_ph gt3r_lon_ph gt3r_y_atc 29323 contentType String modelResult description String Across-track distance projected to the ellipsoid of the received photon from the reference ground track. This is based on the Along-Track Segment algorithm described in Section 3.1 of the ATBD. long_name String Distance off RGT source String ATL03 units String meters origname String y_atc fullnamepath String /gt3r/y_atc coordinates String gt3r_delta_time gt3r_lat_ph gt3r_lon_ph metadata_atl24 contentType String auxiliaryInformation description String atl24 algorithm versioning and build information long_name String ATL24 MetaData source String Derived units String json origname String atl24 fullnamepath String /metadata/atl24 metadata_extent contentType String auxiliaryInformation description String geospatial and temporal extents long_name String Query MetaData source String Derived units String json origname String extent fullnamepath String /metadata/extent metadata_sliderule contentType String auxiliaryInformation source String Derived description String sliderule server and request information long_name String SlideRule MetaData units String json origname String sliderule fullnamepath String /metadata/sliderule orbit_info_crossing_time contentType String referenceInformation source String POD/PPD description String 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. long_name String Ascending Node Crossing Time units String seconds since 2018-01-01 standard_name String time origname String crossing_time fullnamepath String /orbit_info/crossing_time orbit_info_cycle_number contentType String referenceInformation description String Tracks the number of 91-day cycles in the mission, beginning with 01. A unique orbit number can be determined by subtracting 1 from the cycle_number, multiplying by 1387 and adding the rgt value. long_name String Cycle Number source String POD/PPD units String counts origname String cycle_number fullnamepath String /orbit_info/cycle_number orbit_info_lan contentType String referenceInformation description String Longitude at the ascending node crossing. long_name String Ascending Node Longitude source String POD/PPD units String degrees_east origname String lan fullnamepath String /orbit_info/lan orbit_info_orbit_number contentType String referenceInformation description String Unique identifying number for each planned ICESat-2 orbit. long_name String Orbit Number source String Operations units String 1 origname String orbit_number fullnamepath String /orbit_info/orbit_number orbit_info_rgt contentType String referenceInformation description String The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT2L and GT2R. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs. long_name String Reference Ground Track source String POD/PPD units String counts origname String rgt fullnamepath String /orbit_info/rgt orbit_info_sc_orient contentType String referenceInformation description String 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. long_name String Spacecraft Orientation source String POD/PPD units String 1 flag_meanings String backward forward transition flag_values String 0, 1, 2 origname String sc_orient fullnamepath String /orbit_info/sc_orient orbit_info_sc_orient_time contentType String referenceInformation source String POD/PPD description String 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. long_name String Time of Last Spacecraft Orientation Change units String seconds since 2018-01-01 standard_name String time origname String sc_orient_time fullnamepath String /orbit_info/sc_orient_time ancillary_data Container gt1l Container gt1r Container gt2l Container gt2r Container gt3l Container gt3r Container metadata Container metadata_DatasetIdentification Container status String onGoing spatialRepresentationType String along-track creationDate String 2025-09-27T04:46:59.000000Z uuid String 02edefa0-02ff-47fa-b2c5-3ad02bbfa856 fileName String ATL24_20241107234251_08052501_006_01_002_01.h5 VersionID String 002 language String eng characterSet String utf8 shortName String ATL24 originatorOrganizationName String SlideRule abstract String ATL24 provides global along-track coastal and nearshore bathymetry, consisting of refraction corrected seafloor and sea surface heights (orthometric and ellipsoidal heights and instantaneous depths), as well as associated uncertainties. purpose String The purpose of ATL24 is to provide photon level classification of sea surface and seafloor for ATL03 data in coastal and nearshore regions. credit String The ATL24 product was designed and implemented by a team led by Lori Magruder at the University of Texas at Austin, and Christopher Parrish at Oregon State University. topicCategory String geoscientificInformation fullnamepath String /metadata/DatasetIdentification orbit_info Container