GLAH06 Product Data Dictionary

File-Level (Global) Attributes

Attribute Example Value
featureTypetimeSeries
ShortNameGLAH06
titleGLAS/ICESat L1B Global Elevation Data (HDF5)
commentData granules contain approximately 23 minutes (1/4 orbit) and include the surface elevation, surface roughness assuming no slope, surface slope assuming no roughness and geodetic and atmospheric corrections for the range at the full 40/sec resolution.
summaryScientists investigating surface elevation, slope, reflection, and other surface characteristics can use the GLAH06 data. The data values were used in the creation of the surface-specific altimeter products (GLAH12-15). Each GLAH06 file was created from an equivalent GLA06 binary formatted file. Users that want to access the data used to create the GLAH06 values can use the equivalent GLAHxx files for the GLAxx files as shown in the provenance metadata for the history that created the GLA06.
licensehttp://nsidc.org/data/icesat/disclaimer.html
referenceshttp://nsidc.org/data/docs/daac/glas_icesat_l1_l2_global_altimetry.gd.html (Guide Document for this product at NSIDC), http://nsidc.org/daac/icesat/index.html (GLAS Product page at NSIDC)
AccessConstraintsData may not be reproduced or distributed without including the CitationForExternalPublication for this product included in this Metadata. Data may not be distributed in an altered form without the written permission of the GLAS Science Team.
CitationforExternalPublicationThe data used in this study were produced by the GLAS Science Team at the ICESat Science Investigator-led Processing System (I-SIPS) at NASA/GSFC. The data archive site is the NSIDC DAAC.
contributor_roleData Originator, Investigator, Producer, Producer
contributor_nameDavid W. Hancock (David.W.Hancock@nasa.gov), Bob E Schutz (schutz@utcsr.ae.utexas.edu), Jay Zwally (Jay.Zwally@nasa.gov), John P DiMarzio (John.P.Dimarzio.1@nasa.gov)
creator_nameICESat Science Investigator-led Processing System (I-SIPS)
creator_emailDavid.W.Hancock@nasa.gov
publisher_nameNSIDC User Services
publisher_emailnsidc@nsidc.org
publisher_urlhttp://nsidc.org/daac/icesat/index.html
platformIce, Cloud, and Land Elevation Satellite (ICESat)
instrumentGeoscience Laser Altimeter System (GLAS)
processing_level1B
date_created2014-08-19T06:14:49
spatial_coverage_typeHorizontal
history2014-05-24T04:16:41 glas_alt 6.1 GLA06_634_2103_002_0407_1_01_0001.DAT, 2014-08-19T06:14:49.000000Z GLA06_h5_convert Version 1.4 (July 2014) ./GLAH06_634_2103_002_0407_1_01_0001.H5
geospatial_lat_min-90.0
geospatial_lat_max90.0
geospatial_lon_min-180.0
geospatial_lon_max180.0
geospatial_lat_unitsdegrees_north
geospatial_lon_unitsdegrees_east
keywordsEarth Science > Land Surface > Topography > Terrain Elevation > Laser Reflectance, Earth Science > Land Surface > Topography > Surface Roughness > Laser Reflectance, Earth Science > Cryosphere > Glaciers/Ice Sheets > Glacier Elevation/Ice Sheet Elevation > Laser Reflectance, Earth Science > Hydrosphere > Glaciers/Ice Sheets > Glacier Elevation/Ice Sheet Elevation, Earth Science > Oceans > Sea Surface Topography > Sea Surface Slope > Laser Reflectance, Earth Science > Cryosphere > Sea Ice > Reflectance > Laser Reflectance, Earth Science > Land Surface > Surface Radiative Properties > Reflectance > Laser Reflectance, Earth Science > Oceans > Sea Ice > Reflectance > Laser Reflectance, Earth Science > Cryosphere > Sea Ice > Ice Roughness, Earth Science > Oceans > Sea Ice > Ice Roughness, Earth Science > Oceans > Sea Surface Topography > Sea Surface Height
keywords_vocabularyGCMD Science Keywords Version 6.0
standard_name_vocabularynot_set
naming_authorityhttp://dx.doi.org
projectIce, Cloud, and Land Elevation Satellite (GLAS_HDF)
time_typeUTC
date_typeJ2000
time_coverage_start2003-11-18T01:51:38
time_coverage_end2003-11-18T02:12:57
time_coverage_duration1620
sourceSatellite Measurements
HDFVersionHDF5 1.8.9
identifier_file_uuidc0cfb553-496d-4dea-b353-0d89dc66e98f
identifier_product_doi10.5067/ICESAT/GLAS/DATA109
identifier_product_typeGLAH06
identifier_product_format_version1.0
ConventionsCF-1.6
institutionNational Aeronautics and Space Administration (NASA)


Group: /Data_1HZ

This group contains data with a rate of 1HZ. 1Hz data may be indexed to the 40HZ data using the i_rec_ndx parameter in each respective time group.

Dimension Scales

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
DS_UTCTime_1DOUBLE
(UNLIMITED)
Transmit Time of First Shot in frame in J2000
(time)
seconds since 2000-01-01 12:00:00 UTCThe transmit time of the first shot in the 1 second frame measured as UTC seconds elapsed since Jan 1 2000 12:00:00 UTC. This time has been derived from the GPS time accounting for leap seconds.Rel 34 GLAS Binary DataNOT_SET

Group: Data_1HZ/Time

This group contains the 1HZ index and time-related parameters.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
i_rec_ndxINTEGER
(UNLIMITED)
GLAS Record Index
(NOT_SET)
NOT_SETUnique index that relates this record to the corresponding record(s) in each GLAS data product.Rel 34 GLAS Binary DataDS_UTCTime_1
i_shot_countINTEGER
(UNLIMITED)
GLAS Pulse Index
(NOT_SET)
NOT_SETIdentifies each laser shot within a record index. A combination of i_rec_ndx and i_shot_count can be used to uniquely identify each GLAS laser shot.Rel 34 GLAS Binary DataDS_UTCTime_1
d_transtimeDOUBLE
(UNLIMITED)
One way transit time
(NOT_SET)
secondsOne way transit time calculated using the preliminary range offset. This is added to the UTC time tag to get the ground bounce times at which to calculate the orbitRel 34 GLAS Binary DataDS_UTCTime_1
d_deltagpstmcorDOUBLE
(UNLIMITED)
Delta GPS time correction
(NOT_SET)
secondsThe high frequency delta GPS time correction calculated during the precision orbit processing step.Rel 34 GLAS Binary DataDS_UTCTime_1
shot_time_flgINTEGER_1
(UNLIMITED)
time correction flag
(NOT_SET)
NOT_SETShot time flag; Indicates what shot time is used.

flag valuesflag_meanings
0, 1transmit_time ground_bounce_time
Rel 34 GLAS Binary DataDS_UTCTime_1
gps_time_flgINTEGER_1
(UNLIMITED)
time correction flag
(NOT_SET)
NOT_SETGPS time flag; Indicates if delta gps time correction is applied to shot time

flag valuesflag_meanings
0, 1not_applied applied
Rel 34 GLAS Binary DataDS_UTCTime_1
pl_timing_flgINTEGER_1
(UNLIMITED)
time correction flag
(NOT_SET)
NOT_SETPost-launch timing; indicates if post-launch timing bias is applied. Data value is stored in the Metadata group.

flag valuesflag_meanings
0, 1not_applied applied
Rel 34 GLAS Binary DataDS_UTCTime_1
ddelay_flgINTEGER_1
(UNLIMITED)
time correction flag
(NOT_SET)
NOT_SETDigitizer turn-on delay flag; Indicates if digitizer turn-on delay is accounted for in shot time. Data value is stored in the Metadata group.

flag valuesflag_meanings
0, 1applied not_applied
Rel 34 GLAS Binary DataDS_UTCTime_1
peaktp_flgINTEGER_1
(UNLIMITED)
time correction flag
(NOT_SET)
NOT_SETPeak of transmit pulse flag; Indicates if time to peak of transmit pulse is accounted for in shot time.

flag valuesflag_meanings
0, 1applied not_applied
Rel 34 GLAS Binary DataDS_UTCTime_1

Group: Data_1HZ/Geolocation

This group contains geolocation-related parameters.
LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
d_latDOUBLE
(UNLIMITED)
Spot 1 Coordinate Data, Latitude Corrected
(latitude)
degrees_northThe geodetic latitude of the laser spot computed from the precision orbit, precision attitude, and ice-sheet specific range after instrument corrections, atmospheric delays and tides have been applied. The values are in degrees north.Rel 34 GLAS Binary DataDS_UTCTime_1
d_lonDOUBLE
(UNLIMITED)
Spot 1 Coordinate Data, Longitude Corrected
(longitude)
degrees_eastThe longitude of the laser spot computed from the Precision orbit, precision attitude, and ice-sheet specific range after instrument corrections, atmospheric delays and tides have been applied. The values are in degrees east.Rel 34 GLAS Binary DataDS_UTCTime_1
i_trackINTEGER
(UNLIMITED)
Track
(NOT_SET)
NOT_SETThe track number.Rel 34 GLAS Binary DataDS_UTCTime_1

Group: Data_1HZ/Packet_data

This group contains flags indicating packet availability.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
apid_ADLg_1_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETAltimeter Digitizer large wf packet APID availability flag for 1st 10 shots.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_ADLg_2_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETAltimeter Digitizer large wf packet APID availability flag for 2nd 10 shots.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_ADLg_3_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETAltimeter Digitizer large wf packet APID availability flag for 3rd 10 shots.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_ADLg_4_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETAltimeter Digitizer large wf packet APID availability flag for 4th 10 shots.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_ADSm_1_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETAltimeter Digitizer small wf packet APID availability flag for 1st 10 shots.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_ADSm_2_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETAltimeter Digitizer small wf packet APID availability flag for 2nd 10 shots.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_ADSm_3_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETAltimeter Digitizer small wf packet APID availability flag for 3rd 10 shots.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_ADSm_4_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETAltimeter Digitizer small wf packet APID availability flag for 4th 10 shots.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_PC532_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET532 Photon counter packet APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_CD1064_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET1064 Cloud Digitizer packet APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_ADSci_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETAncillary science packet APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_ASAD_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETAltimeter Digitizer telemetry data in Ancillary science packet APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_ASPC_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETPhoton counter telemetry data in Ancillary science packet APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_ASCF_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETCloud Digitizer telemetry data in Ancillary science packet APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_ASCT_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETC&T board telem. data in Ancillary science packet APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_CT20_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETCT HW telemetry packet #1 (APID 20) APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_CT21_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETCT HW telemetry packet #2 (APID 21) APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_CT22_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETCT HW telemetry packet #3 (APID 22) APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_CT23_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETCT HW telemetry packet #4 (APID 23) APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_CT50_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETCT HW telemetry packet #5 (APID 50) APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_SS24_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETSmall software telemetry packet #1 (APID 24) APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_LS25_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETLarge software telemetry packet #1 (APID 25) APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_LS55_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETLarge software telemetry packet #2 (APID 55) APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_GPS_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETGPS telemetry packet APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_PRAP_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETS/C position, rate, and attitude telemetry packet (PRAP) APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_LPA_1_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETLPA packet #1 APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_LPA_2_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETLPA packet #2 APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_LPA_3_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETLPA packet #3 APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1
apid_LPA_4_flgINTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SETLPA packet #4 APID availability flag.

flag valuesflag_meanings
0, 1, 2present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary DataDS_UTCTime_1

Group: Data_1HZ/Quality

This group contains data quality flags and related parameters.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
orbit_pred_flgINTEGER_1
(UNLIMITED)
POD flag (Orbit Flag)
(NOT_SET)
NOT_SETPredicted or precision orbit flag.

flag valuesflag_meanings
0, 1, 2precision_orbit_used predicted_orbit_used onboard_orbit_used
Rel 34 GLAS Binary DataDS_UTCTime_1
orbit_man_flgINTEGER_1
(UNLIMITED)
Maneuver flag
(NOT_SET)
NOT_SETIf maneuvers occurred, orbit is considered degraded.

flag valuesflag_meanings
0, 1no_maneuvers maneuvers_occurred_during_this_record
Rel 34 GLAS Binary DataDS_UTCTime_1
orbit_model_flgINTEGER_1
(UNLIMITED)
Model problems flag.
(NOT_SET)
NOT_SETmodel_problems indicated when orbit RMS > 5 cm; indicates required accuracy not met.

flag valuesflag_meanings
0, 1no_model_problems model_problems
Rel 34 GLAS Binary DataDS_UTCTime_1
orbit_att_flgINTEGER_1
(UNLIMITED)
Attitude flag
(NOT_SET)
NOT_SETmodeled_attitude_used indicates possible orbit degradation.

flag valuesflag_meanings
0, 1instrument_attitude_used_for_orbit modeled_attitude_used
Rel 34 GLAS Binary DataDS_UTCTime_1
orbit_array_flgINTEGER_1
(UNLIMITED)
Solar Array Orientation flag
(NOT_SET)
NOT_SETmodeled_solar_ray_orientation indicates possible orbit degradation

flag valuesflag_meanings
0, 1solar_ray_orientation_used_from measurement modeled_solar_ray_orientation
Rel 34 GLAS Binary DataDS_UTCTime_1
orbit_gps_flgINTEGER_1
(UNLIMITED)
GPS Flag
(NOT_SET)
NOT_SETGPS_data_missing indicates GPS data missing from portion of this record and possible degradation.

flag valuesflag_meanings
0, 1no_GPS_data_outage GPS_data_missing
Rel 34 GLAS Binary DataDS_UTCTime_1
att_offnadir_flgINTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SETOff-nadir angle flag; Indicates if off-nadir angle is within limits.

flag valuesflag_meanings
0, 1within_limit outside_limits
Rel 34 GLAS Binary DataDS_UTCTime_1
att_oceansw_flgINTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SETOcean sweep flag; Indicates if an ocean sweep is within the time frame of this record.

flag valuesflag_meanings
0, 1not_ocean_sweep ocean_sweep
Rel 34 GLAS Binary DataDS_UTCTime_1
att_pointing_flgINTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SETTarget of opportunity off-pointing flag; Indicates if this record is within time of target of opportunity off-pointing.

flag valuesflag_meanings
0, 1not_pointing pointing
Rel 34 GLAS Binary DataDS_UTCTime_1
att_steering_flgINTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SETSteering to reference track flag; Indicates if this record is within target of opportunity off-pointing.

flag valuesflag_meanings
0, 1not_pointing pointing
Rel 34 GLAS Binary DataDS_UTCTime_1
att_actual_flgINTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SETActual data bits flag; Indicates if the first 3 Attitide Flags have been set based on actual data, if ignore, then IGNORE those bits.

flag valuesflag_meanings
0, 1actual ignore
Rel 34 GLAS Binary DataDS_UTCTime_1
att_ist_flgINTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SETIST data flag; Indicates if IST data are good, missing for at least a portion of the time of this frame, noisy for at least a portion of the time of this frame or noisy and missing for at least a portion of the time of this frame.

flag valuesflag_meanings
0, 1, 2, 3good missing noisy missing_noisy
Rel 34 GLAS Binary DataDS_UTCTime_1
att_gyro_flgINTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SETGYRO data flag; Indicates if GYRO data are good, missing for at least a portion of the time of this frame, noisy for at least a portion of the time of this frame or noisy and missing for at least a portion of the time of this frame.

flag valuesflag_meanings
0, 1, 2, 3good missing noisy missing_noisy
Rel 34 GLAS Binary DataDS_UTCTime_1
att_lrs_flgINTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SETLRS Data flag; Indicates the following conditions: LRS data good, consists of star, laser and CRS; LRS data good, but no star data for at least a portion of this frame; LRS data good, but no laser data for at least a portion of this frame; LRS data good, but no CRS data for at least a portion of this frame; LRS data good, but only CRS data for at least a portion of this frame; LRS data good, but only laser data for at least a portion of this frame; LRS data good, but only star data for at least a portion of this frame; Missing LRS for at least a portion of the time of this frame.

flag valuesflag_meanings
0, 1, 2, 3, 4, 5, 6, 7good no_star no_laser no_crs only_crs only_laser only_star missing_lrs
Rel 34 GLAS Binary DataDS_UTCTime_1
altfrm_corr_flgINTEGER_1
(UNLIMITED)
Altimeter Frame Quality Flag
(NOT_SET)
NOT_SETCorrections flag; Indicates if all data in frame are good with appropriate corrections applied; or if some of data are not corrected or have measurement problems.

flag valuesflag_meanings
0, 1good uncorrected
Rel 34 GLAS Binary DataDS_UTCTime_1
altfrm_data_flgINTEGER_1
(UNLIMITED)
Altimeter Frame Quality Flag
(NOT_SET)
NOT_SETFrame data flag; Indicates if there are at least some usable data in the frame; or if all elevations in the frame are bad due to problems with corrections.

flag valuesflag_meanings
0, 1good not_good
Rel 34 GLAS Binary DataDS_UTCTime_1
altfrm_meas_flgINTEGER_1
(UNLIMITED)
Altimeter Frame Quality Flag
(NOT_SET)
NOT_SETMeasurements flag; Indicates if all GLAS measurements are good or if there is at least one unusable measurement in the frame.

flag valuesflag_meanings
0, 1good not_good
Rel 34 GLAS Binary DataDS_UTCTime_1
altfrm_use_flgINTEGER_1
(UNLIMITED)
Altimeter Frame Quality Flag
(NOT_SET)
NOT_SETUsable Measurements flag; Indicates if there is at least one usable measurement in the frame; or if all GLAS measurements are bad.

flag valuesflag_meanings
0, 1usable not_usable
Rel 34 GLAS Binary DataDS_UTCTime_1

Group: Data_1HZ/Transmit_Energy

This group contains information relating to transmit energy.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
d_tpintensity_avgDOUBLE
(UNLIMITED)
Transmit Pulse intensity - frame avg
(NOT_SET)
NOT_SETTransmit pulse intensity as measured by the LPA. Averaged over the 1-second frame. From ANC09.Rel 34 GLAS Binary DataDS_UTCTime_1
d_tpazimuth_avgDOUBLE
(UNLIMITED)
Transmit Pulse azimuth - frame avg
(NOT_SET)
degreesTransmit pulse azimuth. Averaged over the 1-second frame. Angle eastwards from north of the major axis of the transmit pulse, as seen by the LPA. From ANC09.Rel 34 GLAS Binary DataDS_UTCTime_1
d_tpeccentricity_avgDOUBLE
(UNLIMITED)
Transmit Pulse eccentricity - frame avg
(NOT_SET)
NOT_SETTransmit pulse eccentricity as measured by the LPA. Averaged over the 1-second frame. From ANC09.Rel 34 GLAS Binary DataDS_UTCTime_1
d_tpmajoraxis_avgDOUBLE
(UNLIMITED)
Transmit Pulse major axis - frame avg
(NOT_SET)
metersTrasmit pulse major axis as measured by the LPA. Averaged over the 1-second time frame. From ANC09.Rel 34 GLAS Binary DataDS_UTCTime_1

Group: Data_1HZ/Reflectivity

This group contains reflectivity information.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
d_localSolarTimeDOUBLE
(UNLIMITED)
Local apparent solar time
(NOT_SET)
secondsLocal apparent solar time.Rel 34 GLAS Binary DataDS_UTCTime_1
d_AzimuthDOUBLE
(UNLIMITED)
Local Azimuth
(solar_azimuth_angle)
degreesMean azimuth measured clockwise from north based on latitude, longitude, and elevation of a 1 second interval of the trace of the ground footprint-center.Rel 34 GLAS Binary DataDS_UTCTime_1
d_SolAngDOUBLE
(UNLIMITED)
Solar Angle
(NOT_SET)
degreesSolar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low-precision value, with approximately one degree accuracy.Rel 34 GLAS Binary DataDS_UTCTime_1
d_reflCor_atmDOUBLE
(UNLIMITED)
Reflectivity Correction Factor For Atmospheric Effects
(NOT_SET)
NOT_SETThis reflectance correction factor is calculated as 1 / e^(-2(tc+ta+tp+tm)), where tc is the cloud (column) integrated optical depth, ta is the aerosol (column) integrated optical depth, tp is the planetary boundary layer optical depth, and tm is the molecular optical depth. tm is a constant equal to -log(gd_T_RTatm)/2, where gd_T_RTatm = 0.98 is defined in const_elev_mod.f90 or read from ANC07-03. The attenuation correction factor has been corrected for multiple scattering. The reflectance has been corrected for waveform saturation.Rel 34 GLAS Binary DataDS_UTCTime_1

Group: Data_1HZ/Elevation_Flags

This group contains flags indicating the quality or suitability of elevation data.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
surf_ld_flgINTEGER_1
(UNLIMITED)
Region Type - Land
(NOT_SET)
NOT_SETLand flag - 1 = presence of land in the region.

flag valuesflag_meanings
0, 1no_land land
Rel 34 GLAS Binary DataDS_UTCTime_1
surf_si_flgINTEGER_1
(UNLIMITED)
Region Type - Sea Ice
(NOT_SET)
NOT_SETSea Ice flag, 1 = presence of sea ice in the region.

flag valuesflag_meanings
0, 1no_sea_ice sea_ice
Rel 34 GLAS Binary DataDS_UTCTime_1
surf_oc_flgINTEGER_1
(UNLIMITED)
Region Type - Ocean
(NOT_SET)
NOT_SETOcean flag, 1 = presence of ocean in the region.

flag valuesflag_meanings
0, 1no_ocean ocean
Rel 34 GLAS Binary DataDS_UTCTime_1
surf_is_flgINTEGER_1
(UNLIMITED)
Region Type - Ice Sheet
(NOT_SET)
NOT_SETIce Sheet flag, 1 = presence of ice sheet in the region.

flag valuesflag_meanings
0, 1no_ice_sheet ice_sheet
Rel 34 GLAS Binary DataDS_UTCTime_1
rng_ldtide_flgINTEGER_1
(UNLIMITED)
Range Correction Flag - Load Tides
(NOT_SET)
NOT_SETLoad tides flag; 0 = a correction for the dynamic effect of load tides has been applied to the range before the elevation was calculated.

flag valuesflag_meanings
0, 1applied not_applied
Rel 34 GLAS Binary DataDS_UTCTime_1
rng_octide_flgINTEGER_1
(UNLIMITED)
Range Correction Flag - Ocean Tides
(NOT_SET)
NOT_SETOcean tides flag; 0 = a correction for the dynamic effect of ocean tides has been applied to the range before the elevation was calculated.

flag valuesflag_meanings
0, 1applied not_applied
Rel 34 GLAS Binary DataDS_UTCTime_1
rng_setide_flagINTEGER_1
(UNLIMITED)
Range Correction Flag - Solid Earth Tides
(NOT_SET)
NOT_SETSolid earth tides flag; 0 = a correction for the dynamic effect of solid earth tides has been applied to the range before the elevation was calculated.

flag valuesflag_meanings
0, 1applied not_applied
Rel 34 GLAS Binary DataDS_UTCTime_1
rng_drytrop_flgINTEGER_1
(UNLIMITED)
Range Correction Flag - Dry Troposphere
(NOT_SET)
NOT_SETDry troposphere flag; 0 = a correction for propagation errors due to the dry troposphere was applied to the range before the elevation was calculated.

flag valuesflag_meanings
0, 1applied not_applied
Rel 34 GLAS Binary DataDS_UTCTime_1
rng_wettrop_flgINTEGER_1
(UNLIMITED)
Range Correction Flag - Wet Troposphere
(NOT_SET)
NOT_SETWet troposphere flag; 0 = a correction for propagation errors due to the wet troposphere was applied to the range before the elevation was calculated.

flag valuesflag_meanings
0, 1applied not_applied
Rel 34 GLAS Binary DataDS_UTCTime_1
rng_intbias_flgINTEGER_1
(UNLIMITED)
Range Correction Flag - Internal Range Bias
(NOT_SET)
NOT_SETInternal range bias flag; 0 = the internal range bias was applied to the range before the elevation was calculated and if the value of d_refRng on the record has this correction applied.

flag valuesflag_meanings
0, 1applied not_applied
Rel 34 GLAS Binary DataDS_UTCTime_1
rng_plbias_flgINTEGER_1
(UNLIMITED)
Range Correction Flag - Post-launch Range Bias
(NOT_SET)
NOT_SETPost-launch range bias flag; 0 = the post-launch range bias was applied to the range before the elevation was calculated and if the value of d_refRng on the record has this correction applied.

flag valuesflag_meanings
0, 1applied not_applied
Rel 34 GLAS Binary DataDS_UTCTime_1
rng_model_flgINTEGER_1
(UNLIMITED)
Correction Status Flag - Range Model
(NOT_SET)
NOT_SETGeophysical corrections flag; Indicates if the load and ocean tides are from 0=global model, 1=regional model no. 1, 2=regional model no. 2, or 3=regional model no. 3

flag valuesflag_meanings
0, 1, 2, 3global model_1 model_2 model_3
Rel 34 GLAS Binary DataDS_UTCTime_1
rng_oldmet_flgINTEGER_1
(UNLIMITED)
Correction Status Flag - Old MET
(NOT_SET)
NOT_SETGeophysical corrections flag; Indicates if 0=troposphere corrections are based on 6hr NCEP grids surrounding data, 1=6hr NCEP grids but at least one was >6 but <24 hrs away from data, 2=standard atm, or 3=reanalyzed met data.

flag valuesflag_meanings
0, 1, 2, 36_hour over_6_hour standard_atm reanalyzed
Rel 34 GLAS Binary DataDS_UTCTime_1
rng_atmcorr_flgINTEGER_1
(UNLIMITED)
Correction Status Flag - Reflectivity
(NOT_SET)
NOT_SETGeophysical corrections flag; Indicates values used to calculate corrected reflectivity - 0=computed aerosol and cloud optical depths used, 1=default-null aerosol and computed cloud optical depths, 2=computed aerosol and default-null cloud optical depths, 3=default-null values for aerosol and cloud optical depths, or 4=maximum bound set.

flag valuesflag_meanings
0, 1, 2, 3, 4computed only_od only_aerosol defaults max_bound_set
Rel 34 GLAS Binary DataDS_UTCTime_1

Group: Data_1HZ/Atmosphere

This group contains atmosphere information and flags.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
atm_gla11_flgINTEGER_1
(UNLIMITED)
Atmosphere Availability Flag - GLA11
(NOT_SET)
NOT_SETGLA11 data availability flag; 0 = available.

flag valuesflag_meanings
0, 1available not_available
Rel 34 GLAS Binary DataDS_UTCTime_1
atm_gla09_flgINTEGER_1
(UNLIMITED)
Atmosphere Availability Flag - GLA09
(NOT_SET)
NOT_SETGLA09 data availability flag; 0 = available.

flag valuesflag_meanings
0, 1available not_available
Rel 34 GLAS Binary DataDS_UTCTime_1
atm_char_flagINTEGER_1
(UNLIMITED)
Atmosphere Characterization Flag
(NOT_SET)
NOT_SETFlag to characterize cloud and blowing snow state of the atmosphere based on combinations of hi_cloud (> 5 km), mid_cloud (>2, <=5 km), low cloud (> 500 m, <=2 km), blowing snow or fog and hi/lo optical depth. Additional values indicate if the characterization was not tested or if the data quality was insufficient to assign a flag.

flag valuesflag_meanings
0, 1, 2, 3, 4, 5, 6, 7, 8clear hi_cloud_low_od hi_cloud_high_od mid_cloud_low_od mid_cloud_hi_od low_cloud_low_od low_cloud_hi_od blowing_snow_low_od blowing_snow_hi_od
Rel 34 GLAS Binary DataDS_UTCTime_1
atm_char_confINTEGER_1
(UNLIMITED)
Atmosphere Characterization Flag Confidence
(NOT_SET)
NOT_SETConfidence level ascribed to the atmosphere characterization flag. 0=not applicable (for contamination flag values of 9 or 10). 1: low confidence. 2: reasonable confidence. 3: high confidence. 10: data quality insufficient to assign flag.

flag valuesflag_meanings
0, 1, 2, 3, 10not_applicable low_confidence reasonable_confidence high_confidence quality_insufficient
Rel 34 GLAS Binary DataDS_UTCTime_1
cld1_mswf_flgINTEGER_1
(UNLIMITED)
Cloud Multiple Scattering Warning Flag
(NOT_SET)
NOT_SETThe multiple scattering warning flag (MSWF) is based on the total column optical depth (aerosol plus cloud) calculated in GLA11 using 532nm. It is intended as a way to quickly obtain information about the potential severity of multiple scattering with regards to the range-to-surface calculated by the altimetry processing software. The multiple scattering warning flag will have values ranging from 0-14, based on the total column optical depth. A warning flag value of 15 will signify invalid. An invalid will be encoded if an optical depth in any of the layers in the 1-second column could not be calculated. This usually occurs in a very optically thick cloud which extinguishes the signal. It could also occur if the extinction-to-backscatter ratio assignment is set too high, causing the transmission calculations in the lidar inversion to go out-of-range.

flag valuesflag_meanings
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15under_0.010 0.010_0.030 0.030_0.060 0.060_0.100 0.100_0.150 0.150_0.225 0.225_0.300 0.300_0.400 0.400_0.500 0.500_0.670 0.670_0.900 0.900_1.200 1.200_1.600 1.600_2.000 over_2.000 invalid
Rel 34 GLAS Binary DataDS_UTCTime_1
MRC_af_flgINTEGER_1
(UNLIMITED)
Medium Resolution Cloud Availability Flag
(NOT_SET)
NOT_SETIndicates number of cloud layers at medium resolution from the 532 nm channel; not_searched = cloud layers were not searched for; not_detected = cloud layers were searched for, but not detected.

flag valuesflag_meanings
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15not_searched 1 2 3 4 5 6 7 8 9 10 11 12 13 14 not_detected
Rel 34 GLAS Binary DataDS_UTCTime_1
d_Surface_tempDOUBLE
(UNLIMITED)
Surface Temperature
(surface_temperature)
degree CelsiusAtmospheric temperature at Earth's surface level measured in degrees celcius and derived from the meteorological data files.Rel 34 GLAS Binary DataDS_UTCTime_1
d_Surface_presDOUBLE
(UNLIMITED)
Surface Pressure
(surface_air_pressure)
hPaAtmospheric pressure at Earth's surface level measured in hPa and derived from the meteorological data files. This surface pressure is computed in the atmospheric processing and is not the pressure used for the troposphere delay correction.Rel 34 GLAS Binary DataDS_UTCTime_1
d_Surface_relhDOUBLE
(UNLIMITED)
Relative Humidity
(relative_humidity)
percentAtmospheric relative humidity at Earth's surface level measured as a percentage and derived from the meteorological data files.Rel 34 GLAS Binary DataDS_UTCTime_1


Group: /Data_40HZ/

This group contains data with a rate of 40HZ. 40Hz data may be indexed to the 1HZ data using the i_rec_ndx parameter in each respective time group.

Dimension Scales

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
DS_UTCTime_40DOUBLE
(UNLIMITED)
Transmit time of each shot in J2000 seconds
(time)
seconds since 2000-01-01 12:00:00 UTCThe transmit time of each shot in the 1 second frame measured as UTC seconds elapsed since Jan 1 2000 12:00:00 UTC. This time has been derived from the GPS time accounting for leap seconds.Rel 34 GLAS Binary DataNOT_SET
DS_DEMhiresArElvINTEGER
(UNLIMITED)
Location index for D_DEMhiresArElv
(NOT_SET)
NOT_SETThis array indicates the relative position of each d_DEMhiresArElv measurement. Direction is relative to the spot and indicated in cardinal points. The position of the spot is indicated as ORIGIN.

flag valuesflag_meanings
1, 2, 3, 4, 5, 6, 7, 8, 9NW N NE W ORIGIN E SW S SE
ConstantsNOT_SET

Group: Data_40HZ/Time

This group contains the 40HZ index and time-related parameters.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
i_rec_ndxINTEGER
(UNLIMITED)
GLAS Record Index
(NOT_SET)
NOT_SETUnique index that relates this record to the corresponding record(s) in each GLAS data product.Rel 34 GLAS Binary DataDS_UTCTime_40
i_shot_countINTEGER
(UNLIMITED)
GLAS Pulse Index
(NOT_SET)
NOT_SETIdentifies each laser shot within a record index. A combination of i_rec_ndx and i_shot_count can be used to uniquely identify each GLAS laser shot.Rel 34 GLAS Binary DataDS_UTCTime_40

Group: Data_40HZ/Geolocation

This group contains geolocation-related parameters.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
d_latDOUBLE
(UNLIMITED)
Spot 1 Coordinate Data, Latitude Corrected
(latitude)
degrees_northThe geodetic latitude of the laser spot computed from the precision orbit, precision attitude, and ice-sheet specific range after instrument corrections, atmospheric delays and tides have been applied. The values are in degrees north.Rel 34 GLAS Binary DataDS_UTCTime_40
d_lonDOUBLE
(UNLIMITED)
Spot 1 Coordinate Data, Longitude Corrected
(longitude)
degrees_eastThe longitude of the laser spot computed from the Precision orbit, precision attitude, and ice-sheet specific range after instrument corrections, atmospheric delays and tides have been applied. The values are in degrees east.Rel 34 GLAS Binary DataDS_UTCTime_40

Group: Data_40HZ/Elevation_Surfaces

This group contains surface-related parameters.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
d_elevDOUBLE
(UNLIMITED)
Surface Elevation
(height_above_reference_ellipsoid)
metersSurface elevation with respect to the ellipsoid at the spot location determined by the ice-sheet specific range after instrument corrections, atmospheric delays and tides have been applied. The saturation elevation correction (d_satElevCorr) has not been applied and needs to be added to this elevation. This can be over a one meter correction. If it is invalid then the elevation should not be used. The saturation correction flag (sat_corr_flg) is an important flag to understand the possible quality of the elevation data. The saturation index (i_satNdx) can be used for more understanding of concerns on data quality from saturation effects. Also no correction for pulse spreading from forward scatter has been applied.Rel 34 GLAS Binary DataDS_UTCTime_40
d_refRngDOUBLE
(UNLIMITED)
Reference Range
(altimeter_range)
metersRange in distance calculated from the time between the centroid of the transmit pulse and the farthest gate from the spacecraft of the received pulse. See the rngcorrflg to determine any corrections that have been applied.Rel 34 GLAS Binary DataDS_UTCTime_40

Group: Data_40HZ/Elevation_Corrections

This group contains elevation-related corrections.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
d_dTropDOUBLE
(UNLIMITED)
Range Correction, Dry Troposphere
(altimeter_range_correction_due_to_dry_troposphere)
metersThe range correction due to the dry troposphere. Validity is based on results of finding a range with the standard fit.Rel 34 GLAS Binary DataDS_UTCTime_40
d_satElevCorrDOUBLE
(UNLIMITED)
Saturation Elevation Correction
(NOT_SET)
metersCorrection to elevation for saturated waveforms. This correction has NOT been applied to the data. To apply it SUBTRACT the correction from the range estimate. To apply the correction to the elevations it must be ADDED to the elevation estimates.Rel 34 GLAS Binary DataDS_UTCTime_40
d_GmCDOUBLE
(UNLIMITED)
Range correction in m calc from Trans pulse peak loc to centroid
(NOT_SET)
mThe difference of the Gaussian fit to the transmit pulse and the centroid of it. This correction was applied to the range before the computation of elevation. It is an additive correction to an elevation relative to Tx centroid to make the elevation relative to the Tx Gaussian.Rel 34 GLAS Binary DataDS_UTCTime_40
d_wTropDOUBLE
(UNLIMITED)
Range Correction_Wet Troposphere
(altimeter_range_correction_due_to_wet_troposphere)
metersThe range correction due to the wet troposphere. (See ATBDs)Rel 34 GLAS Binary DataDS_UTCTime_40

Group: Data_40HZ/Elevation_Angles

This group contains pointing angle parameters.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
d_beamCoelvDOUBLE
(UNLIMITED)
Co-elevation
(NOT_SET)
degreesCo-elevation (CE) is direction from vertical of the laser beam as seen by an observer located at the laser ground spot.Rel 34 GLAS Binary DataDS_UTCTime_40
d_beamAzimuthDOUBLE
(UNLIMITED)
Azimuth
(NOT_SET)
degreesThe 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.Rel 34 GLAS Binary DataDS_UTCTime_40

Group: Data_40HZ/Elevation_Offsets

The group contains elevation offsets. These offsets allow the elevation for the specific surface types to be derived.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
d_SigBegOffDOUBLE
(UNLIMITED)
Signal Begin Range Offset
(NOT_SET)
metersOffset to be added to d_refRng to give the range in distance to the location of the received echo calculated at the beginning of signal (closest to the spacecraft) using standard parameters.Rel 34 GLAS Binary DataDS_UTCTime_40
d_TrshRngOffDOUBLE
(UNLIMITED)
Threshold Retracker Range Offset
(NOT_SET)
metersOffset to be added to d_refRng to give the range in distance to the threshold retracker location of the received echo using standard parameters.Rel 34 GLAS Binary DataDS_UTCTime_40
d_SigEndOffDOUBLE
(UNLIMITED)
Signal End Range Offset
(NOT_SET)
metersOffset to be added to d_refRng to give the range in distance to the location on the received echo calculated at the end of signal (farthest from the spacecraft) using standard parameters.Rel 34 GLAS Binary DataDS_UTCTime_40
d_cntRngOffDOUBLE
(UNLIMITED)
Centroid Range Offset
(NOT_SET)
metersOffset to be added to d_refRng to give the range in distance to the location of the centroid of the received echo from signal begin through signal end defined by the standard parameters.Rel 34 GLAS Binary DataDS_UTCTime_40
d_isRngOffDOUBLE
(UNLIMITED)
Ice Sheet Range Offset
(NOT_SET)
metersRange offset to be added to d_refRng to calculate the range using the algorithm deemed appropriate for ice sheets.Rel 34 GLAS Binary DataDS_UTCTime_40
d_siRngOffDOUBLE
(UNLIMITED)
Sea Ice Range Offset
(NOT_SET)
metersRange offset to be added to d_refRng to calculate the range using the algorithm deemed appropriate for sea ice.Rel 34 GLAS Binary DataDS_UTCTime_40
d_ldRngOffDOUBLE
(UNLIMITED)
Land Range Offset
(NOT_SET)
metersRange offset to be added to d_refRng to calculate the range using the algorithm deemed appropriate for land.Rel 34 GLAS Binary DataDS_UTCTime_40
d_ocRngOffDOUBLE
(UNLIMITED)
Ocean Range Offset
(NOT_SET)
metersRange offset to be added to d_refRng to calculate the range using the algorithm deemed appropriate for oceans.Rel 34 GLAS Binary DataDS_UTCTime_40

Group: Data_40HZ/Quality

This group contains data quality flags and related parameters.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
rng_uqf_sigbeg1_flgINTEGER_1
(UNLIMITED)
Range Offset Quality/Use Flag
(NOT_SET)
NOT_SETSignal begin range increment flag (standard)

flag valuesflag_meanings
0, 1valid not_valid
Rel 34 GLAS Binary DataDS_UTCTime_40
rng_uqf_sigend1_flgINTEGER_1
(UNLIMITED)
Range Offset Quality/Use Flag
(NOT_SET)
NOT_SETSignal end range increment flag, (standard)

flag valuesflag_meanings
0, 1valid not_valid
Rel 34 GLAS Binary DataDS_UTCTime_40
rng_uqf_thres1_flgINTEGER_1
(UNLIMITED)
Range Offset Quality/Use Flag
(NOT_SET)
NOT_SETThreshold retracker range increment flag (standard).

flag valuesflag_meanings
0, 1valid not_valid
Rel 34 GLAS Binary DataDS_UTCTime_40
rng_uqf_cent1_flgINTEGER_1
(UNLIMITED)
Range Offset Quality/Use Flag
(NOT_SET)
NOT_SETCentroid retracker range increment flag (standard).

flag valuesflag_meanings
0, 1valid not_valid
Rel 34 GLAS Binary DataDS_UTCTime_40
rng_uqf_sigbeg2_flgINTEGER_1
(UNLIMITED)
Range Offset Quality/Use Flag
(NOT_SET)
NOT_SETSignal begin range increment flag (alternate)

flag valuesflag_meanings
0, 1valid not_valid
Rel 34 GLAS Binary DataDS_UTCTime_40
rng_uqf_sigend2_flgINTEGER_1
(UNLIMITED)
Range Offset Quality/Use Flag
(NOT_SET)
NOT_SETSignal end range increment flag (alternate)

flag valuesflag_meanings
0, 1valid not_valid
Rel 34 GLAS Binary DataDS_UTCTime_40
rng_uqf_thres2_flgINTEGER_1
(UNLIMITED)
Range Offset Quality/Use Flag
(NOT_SET)
NOT_SETThreshold retracker range increment flag (alternate)

flag valuesflag_meanings
0, 1valid not_valid
Rel 34 GLAS Binary DataDS_UTCTime_40
rng_uqf_cent2_flgINTEGER_1
(UNLIMITED)
Range Offset Quality/Use Flag
(NOT_SET)
NOT_SETCentroid retracker range increment flag (alternate)

flag valuesflag_meanings
0, 1valid not_valid
Rel 34 GLAS Binary DataDS_UTCTime_40
rng_uqf_is_flgINTEGER_1
(UNLIMITED)
Range Offset Quality/Use Flag
(NOT_SET)
NOT_SETIce sheet range increment flag

flag valuesflag_meanings
0, 1valid not_valid
Rel 34 GLAS Binary DataDS_UTCTime_40
rng_uqf_si_flgINTEGER_1
(UNLIMITED)
Range Offset Quality/Use Flag
(NOT_SET)
NOT_SETSea ice range increment flag

flag valuesflag_meanings
0, 1valid not_valid
Rel 34 GLAS Binary DataDS_UTCTime_40
rng_uqf_ld_flgINTEGER_1
(UNLIMITED)
Range Offset Quality/Use Flag
(NOT_SET)
NOT_SETLand range increment flag

flag valuesflag_meanings
0, 1valid not_valid
Rel 34 GLAS Binary DataDS_UTCTime_40
rng_uqf_oc_flgINTEGER_1
(UNLIMITED)
Range Offset Quality/Use Flag
(NOT_SET)
NOT_SETOcean range increment flag

flag valuesflag_meanings
0, 1valid not_valid
Rel 34 GLAS Binary DataDS_UTCTime_40
sat_corr_flgINTEGER_1
(UNLIMITED)
Saturation Correction Flag
(NOT_SET)
NOT_SETSaturation Correction Flag; Indicates if the saturation is Not Saturated (i_satNdx<2) or No Signal; Inconsequential (i_satNdx>=2 & i_pctSat<2.0); is Applicable (i_satNdx>=2 & i_pctSat>=2.0 & Full Width*<100ns); is Not Computable; is Not Applicable (i_satNdx>=2 & i_pctSat>=2.0 & Full Width*>=100ns)

flag valuesflag_meanings
0, 1, 2, 3, 4, 5not_saturated inconsequential applicable not_computed not_applicable
Rel 34 GLAS Binary DataDS_UTCTime_40
elev_use_flgINTEGER_1
(UNLIMITED)
Elevation use flag
(NOT_SET)
NOT_SETFlag indicating whether the elevations on this record should be used.

flag valuesflag_meanings
0, 1valid not_valid
Rel 34 GLAS Binary DataDS_UTCTime_40
att_pad_use_flgINTEGER_1
(UNLIMITED)
Pad Use Flag
(NOT_SET)
NOT_SETPAD Use Flag: 1 = PAD used to determine spot location.

flag valuesflag_meanings
0, 1used not_used
Rel 34 GLAS Binary DataDS_UTCTime_40
att_calc_pad_flgINTEGER_1
(UNLIMITED)
Calc Pad Use Flag
(NOT_SET)
NOT_SETCalc PAD Use Flag; Indicates if new PAD or pass-thru PAD was used to determine orbit.

flag valuesflag_meanings
0, 1new pass_thru
Rel 34 GLAS Binary DataDS_UTCTime_40
att_lpa_flgINTEGER_1
(UNLIMITED)
LPA Problem Flag
(NOT_SET)
NOT_SETLPA Problem Flag; Indicates if LPA is good, missing or noisy.

flag valuesflag_meanings
0, 1, 2good missing noisy
Rel 34 GLAS Binary DataDS_UTCTime_40
sigma_att_flgINTEGER_1
(UNLIMITED)
Attitude Quality Indicator
(NOT_SET)
NOT_SETAttitude quality indicator flag.

flag valuesflag_meanings
0, 50, 100, 127good warning bad not_valid
Rel 34 GLAS Binary DataDS_UTCTime_40
i_satNdxINTEGER
(UNLIMITED)
Saturation Index
(NOT_SET)
nsThe count of the number of gates in a waveform which have an amplitude greater than or equal to i_satNdxTh (set in anc07_0004). The value 126 means 126 or more gates are above the saturation index threshold (i_satNdxth).Rel 34 GLAS Binary DataDS_UTCTime_40
d_pctSATDOUBLE
(UNLIMITED)
Percent Saturation
(NOT_SET)
percentPercent saturation (d_pctSAT) is calculated using the formula: d_pctSAT= 100*(saturation index)/ ( signal end - signal begin in nanoseconds). The alternate signal end/begin are used for GLA14 d_pctSAT, while the standard fit values are used for GLA06, 12, 13, and 15. The Saturation elevation correction is not applied in the geolocation processing computation of lat, lon and elev. Because the saturation corrections are small and data is acquired within 5 deg off nadir, effects on lat and lon can be ignored. To apply the saturation elevation correction to the elevations on the products it must be ADDED to the elevation estimates. Reported elevations for returns with invalid d_satElevCorr values and sat_corr_flg values of 3 or 4 are likely to have large, uncorrectable errors and should be excluded from analyses.Rel 34 GLAS Binary DataDS_UTCTime_40

Group: Data_40HZ/Elevation_Flags

This group contains flags related to the elevation estimates for each shot.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
elv_cnt_1_flgINTEGER_1
(UNLIMITED)
Elevation Definition Flag
(NOT_SET)
NOT_SETStandard parameterization; 1 = centroid of received pulse between signal begin and signal end defined for standard parameterization used to calculate elevation.

flag valuesflag_meanings
0, 1false true
Rel 34 GLAS Binary DataDS_UTCTime_40
elv_cnt_2_flgINTEGER_1
(UNLIMITED)
Elevation Definition Flag
(NOT_SET)
NOT_SETAlternate parameterization; 1 = centroid of received pulse between signal begin and signal end defined for alternate parameterization used to calculate elevation.

flag valuesflag_meanings
0, 1false true
Rel 34 GLAS Binary DataDS_UTCTime_40
elv_peak_1_flgINTEGER_1
(UNLIMITED)
Elevation Definition Flag
(NOT_SET)
NOT_SETStandard parameterization; 1 = location of last Gaussian peak in received pulse for standard parameterization used to calculate elevation.

flag valuesflag_meanings
0, 1false true
Rel 34 GLAS Binary DataDS_UTCTime_40
elv_peak_2_flgINTEGER_1
(UNLIMITED)
Elevation Definition Flag
(NOT_SET)
NOT_SETAlternate parameterization; 1 = location of last gaussian peak in received pulse for alternate parameterization used to calculate elevation.

flag valuesflag_meanings
0, 1false true
Rel 34 GLAS Binary DataDS_UTCTime_40
elv_thres_flgINTEGER_1
(UNLIMITED)
Elevation Definition Flag
(NOT_SET)
NOT_SETThreshold retracker; 1 = Location of threshold retracker used to calculate elevation.

flag valuesflag_meanings
0, 1false true
Rel 34 GLAS Binary DataDS_UTCTime_40
elv_gauss_flgINTEGER_1
(UNLIMITED)
Elevation Definition Flag
(NOT_SET)
NOT_SETGaussion; 1 = location associated with gaussian with largest peak used to calculate elevation.

flag valuesflag_meanings
0, 1false true
Rel 34 GLAS Binary DataDS_UTCTime_40
elv_other_flgINTEGER_1
(UNLIMITED)
Elevation Definition Flag
(NOT_SET)
NOT_SETOther algorithm; 1 = other algorithm used to calculate elevation - see software release documentation for details.

flag valuesflag_meanings
0, 1false true
Rel 34 GLAS Binary DataDS_UTCTime_40
elv_cloud_flgINTEGER_1
(UNLIMITED)
Elevation Definition Flag
(NOT_SET)
NOT_SETCloud contamination; 1 = Gain > flag value, indicating probable cloud contamination

flag valuesflag_meanings
0, 1false true
Rel 34 GLAS Binary DataDS_UTCTime_40

Group: Data_40HZ/Transmit_Energy

This group contains transmit energy parameters.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
d_TxNrgDOUBLE
(UNLIMITED)
1064 nm Laser Transmit Energy
(NOT_SET)
joulesThe 1064 nm laser pulse transmitted energy in energy units, computed from the digitized outgoing pulse, and the transmit gain.Rel 34 GLAS Binary DataDS_UTCTime_40

Group: Data_40HZ/Geophysical

This group contains geophysical parameters.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
d_d2refTrkDOUBLE
(UNLIMITED)
Distance to the reference ground track
(NOT_SET)
metersDistance to the reference ground track.Rel 34 GLAS Binary DataDS_UTCTime_40
d_DEM_elvDOUBLE
(UNLIMITED)
DEM Elevation
(NOT_SET)
metersElevation at the footprint location from the SRTM30 (GTOPO30 + SRTM) Digital Elevation Model (DEM). The reference frame for the DEM elevation was changed to the TOPEX/Poseidon ellipsoid to make it consistent with the GLAS elevations.Rel 34 GLAS Binary DataDS_UTCTime_40
d_DEMhiresArElvDOUBLE
(UNLIMITED, 9)
DEMhiresArElv
(NOT_SET)
metersd_DEMhiresArElv is a 9 element array of high resolution DEM values. The array index corresponds to the position of the DEM value relative to the spot. (5) is the footprint center.Rel 34 GLAS Binary DataDS_UTCTime_40, d_DEMhiresArElv
d_ocElvDOUBLE
(UNLIMITED)
Ocean Tide Elevation
(sea_surface_height_amplitude_due_to_non_equilibrium_ocean_tide)
metersThe ocean tide elevation from the TPX07.1 tide model.Rel 34 GLAS Binary DataDS_UTCTime_40
d_poTideDOUBLE
(UNLIMITED)
Pole Tide
(sea_surface_height_amplitude_due_to_pole_tide)
metersPole tide: an ocean tide which is the result of the Chandler wobble (a free nutation of the Earth caused by fluctuating pressure on the bottom of the ocean, caused by temperature and salinity changes and wind-driven changes in the circulation of the oceans).Rel 34 GLAS Binary DataDS_UTCTime_40
d_gdHtDOUBLE
(UNLIMITED)
Geoid
(geoid_height_above_reference_ellipsoid)
metersThe height of the geoid above the ellipsoid. EGM2008 geoid height above the reference ellipsoid.Rel 34 GLAS Binary DataDS_UTCTime_40
d_erElvDOUBLE
(UNLIMITED)
Solid Earth Tide Elevation
(geoid_height_above_reference_ellipsoid)
metersThe solid earth tide elevation.Rel 34 GLAS Binary DataDS_UTCTime_40
d_eqElvDOUBLE
(UNLIMITED)
Equilibrium Tide Elevation
(sea_surface_height_amplitude_due_to_equilibrium_ocean_tide)
metersThe equilibrium (long period) tide at last valid shot over the ocean.Rel 34 GLAS Binary DataDS_UTCTime_40
d_ldElvDOUBLE
(UNLIMITED)
Load Tide Elevation
(NOT_SET)
metersThe load tide elevation applied to each shot.Rel 34 GLAS Binary DataDS_UTCTime_40
d_deltaEllipDOUBLE
(UNLIMITED)
Delta Ellipsoid
(NOT_SET)
metersSurface elevation(T/P ellipsoid) minus surface elevation (WGS84 ellipsoid).Rel 34 GLAS Binary DataDS_UTCTime_40
d_ElevBiasCorrDOUBLE
(UNLIMITED)
Elevation Bias Correction
(NOT_SET)
metersCorrection to elevation based on post flight analysis for biases determined for each campaign. This bias correction has not been applied to the data. To apply it SUBTRACT the correction from the range estimate. To apply the correction to the elevations it must be ADDED to the elevation estimates.Rel 34 GLAS Binary DataDS_UTCTime_40
i_DEM_hires_src_1INTEGER_1
(UNLIMITED)
High Resolution Source Flag
(NOT_SET)
NOT_SETHigh resolution DEM source provider; Indicates if no high res source available, unfinished research Shuttle Radar Topography Mission (SRTM) C-band 90m DEM produced by JPL (+-1.1km E-W swath), finished' SRTM C-band 90 m DEM produced by NGA (+-2.1km E-W swath), ICESat Greenland V1 1km DEM, ICESat Antarctica V1 500m DEM, 90m Canadian Digital Elevation Data (CDED), Data in overlap area of SRTM and CDED. Value reported is from finished SRTM C-band 90 m DEM.

flag valuesflag_meanings
0, 1, 2, 3, 4, 5, 6none pre_srtm srtm greenland antarctica cded_90 olap_srtm
Rel 34 GLAS Binary DataDS_UTCTime_40

Group: Data_40HZ/Reflectivity

This group contains reflectivity parameters.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
d_reflctUCDOUBLE
(UNLIMITED)
reflctUC
(NOT_SET)
NOT_SETReflectivity, not corrected for atmospheric effects, is calculated as Refl = R/T, where R is the received energy after it has been scaled for range, and T is the transmitted energy. i_reflctUC has also been calibrated for gain non-linearity (only for non-saturated waveforms), ground truth calibration and boresight shift shadowing (BSS). It is not corrected for saturation effects. If the shot is saturated (satindex above 2) then to correct for saturation the reflectivity estimate needs to be multiplied by the ratio of the corrected energy to the uncorrected energy (sat corrected reflectivity = d_reflctUC * (d_RecNrgAll + d_satNrgCorr)/d_RecNrgAll). The atmospheric corrected reflectivity may be calculated from this uncorrected reflectivity by multiplying it by d_reflCor_atm. d_reflctUC is invalid where d_satNrgCorr is invalid.Rel 34 GLAS Binary DataDS_UTCTime_40
d_sDevNsOb1DOUBLE
(UNLIMITED)
Standard deviation of 1064 nm Background noise, (alternate)
(NOT_SET)
voltsThe standard deviation of the background noise (alternate parameters).Rel 34 GLAS Binary DataDS_UTCTime_40
d_satNrgCorrDOUBLE
(UNLIMITED)
Saturation Energy Correction
(NOT_SET)
joulesCorrection to energy for saturated waveforms. This correction has not been applied to the energy. It should be ADDED to any echo pulse energy calculated from the pulse area under the waveform. Also any reflectivity estimates need to be corrected for this error in energy measurement.Rel 34 GLAS Binary DataDS_UTCTime_40
d_RecNrgAllDOUBLE
(UNLIMITED)
Received Energy signal begin to signal end
(NOT_SET)
joulesThis is calculated by taking the area under the received waveform (referenced to the observed noise) from all responses between the noise crossing before the first threshold crossing and the noise crossing after the last threshold crossing. It is a rescaled value from the GLA01 parameter d_recNrgAll_EU and is not recomputed.Rel 34 GLAS Binary DataDS_UTCTime_40

Group: Data_40HZ/Waveform

This group contains waveform-related parameters.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
d_skew2DOUBLE
(UNLIMITED)
Skewness
(NOT_SET)
NOT_SETThe skewness of the received echo from signal begin to signal end using standard parameters.Rel 34 GLAS Binary DataDS_UTCTime_40
d_kurt2DOUBLE
(UNLIMITED)
Kurtosis of the Received Echo (standard)
(NOT_SET)
NOT_SETKurtosis of the received echo from signal begin to signal end using standard parametersRel 34 GLAS Binary DataDS_UTCTime_40
d_maxRecAmpDOUBLE
(UNLIMITED)
Max Amplitude of Received Echo
(NOT_SET)
voltsMaximum amplitude of the received echo.Rel 34 GLAS Binary DataDS_UTCTime_40
d_maxSmAmpDOUBLE
(UNLIMITED)
Peak Amplitude of Smoothed Received Echo
(NOT_SET)
voltsThe peak amplitude of the received echo after it has been smoothed to remove high frequency noise (see ATBD).Rel 34 GLAS Binary DataDS_UTCTime_40
i_nPeaks1INTEGER
(UNLIMITED)
Initial Number of Peaks in received echo (alternate)
(NOT_SET)
NOT_SETThe initial number of peaks of the received echo; determined from the smoothed waveform, using alternate parameters.Rel 34 GLAS Binary DataDS_UTCTime_40
i_numPkINTEGER
(UNLIMITED)
Number of Peaks found in the Return
(NOT_SET)
NOT_SETThe number of peaks in the return echo found by the gaussian fitting procedure, using standard parameters.Rel 34 GLAS Binary DataDS_UTCTime_40
i_gval_rcvINTEGER
(UNLIMITED)
Gain Value used for Received Pulse
(NOT_SET)
NOT_SETGain value used for received pulse - uncalibrated.Rel 34 GLAS Binary DataDS_UTCTime_40

Group: Data_40HZ/Atmosphere

This group contains atmosphere-related parameters.

LabelDatatype
(Dimensions)
long_name
(standard_name)
unitsdescriptionsourcecoordinates
d_FRir_cldtopDOUBLE
(UNLIMITED)
Full Resolution 1064 Cloud Top
(NOT_SET)
metersFull resolution (40 Hz) cloud top height obtained from the 1064 atmospheric channel. This parameter is in GLA09.Rel 34 GLAS Binary DataDS_UTCTime_40
FRir_qa_flgINTEGER_1
(UNLIMITED)
Full Resolution 1064 Quality Flag
(NOT_SET)
NOT_SETFull resolution 1064 Quality Flag; 0 - 12 indicate Cloud detected by cloud search algorithm with higher numbers indicating a stronger average signal from the region starting at cloud top and extending 500 m below cloud top height; 13 = Indicates the possible presence of a cloud based on the value of the integrated signal parameter (i_FRir_intsig) that was not detected directly by the cloud search algorithm. When this occurs, the 40 Hz cloud top height (i_Frir_cldtop) is set to a value of 10.0 km; 14 = Indicates the likely presence of low clouds (< 150 m) based on elevated signal from the two bins above the ground return bin that were not detected directly by the cloud search algorithm. When this occurs, the 40 Hz cloud top height (i_Frir_cldtop) is set to a value of 0.10; 15 = No clouds

flag valuesflag_meanings
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 150 1 2 3 4 5 6 7 8 9 10 11 12 possible likely no_clouds
Rel 34 GLAS Binary DataDS_UTCTime_40
d_FRir_intsigDOUBLE
(UNLIMITED)
Full Resolution 1064 Integrated Signal
(NOT_SET)
1/(m-sr)Though called 'integrated signal' this is actually an average of all bins in the above-ground portion of the 1064 40 Hz profile with values above the threshold of 1.0e-7 (1/(m-sr) units). This parameter is for a 1 second record. This parameter is extracted from the equivalent parameter on GLA09.Rel 34 GLAS Binary DataDS_UTCTime_40

/ANCILLARY_DATA

/ANCILLARY_DATA

Attribute Example Value
Campaign2A
glas_osc_rate1.000000023
glas_osc_rate_date2003-10-30
glas_osc_rate_time00:00:00
sc_osc_rate0.99999998854809
sc_osc_rate_date2003-10-30
sc_osc_rate_time00:00:00
internal_time_delay0.0000151100
internal_time_delay_date2003-10-30
internal_time_delay_time00:00:00
internal_range_delay9.5560
internal_range_delay_date2003-10-30
internal_range_delay_time00:00:00
Additional_AttributeSP_ICE_PATH_NO, SP_ICE_GLAS_StartBlock, SP_ICE_GLAS_EndBlock, ReferenceOrbit, Track, Track_Segment, Cycle, Instance, Range_Bias, Range_Bias_Date, Range_Bias_Time, Timing_Bias, Timing_Bias_Date, Timing_Bias_Time, PercentGroundHit, OrbitQuality
globAvSrfPres1100964.3794153
gASP_t1122385600.0000000
globAvSrfPres297867.7153547
gASP_t2122407200.0000000
internal_range_delay_descInternal range calibration bias determined during GLAS instrument integration testing and validated in-flight, meters.
internal_time_delay_descInternal time calibration bias determined during GLAS instrument integration testing and validated in-flight, seconds.

/METADATA

/METADATA

Attribute Example Value
descriptionThis group contains structured, computer-parseable ECHO-style collection and inventory-level metadata.
HDFVersionHDF5 1.8.9
ControlFilecf_name=CTL00_000_20140818_2614398_01_gla06_h5_convert.ctl

/METADATA/COLLECTIONMETADATA

Attribute Example Value
DLLNamelibDsESDTGlGLASPoly.001Sh.so
GranuleTimeDuration1620
SpatialSearchTypeOrbit
DataFileFormatHDF5
ScienceMimeTypeapplication/x-hdfeos
BrowseMimeTypeapplication/x-hdfeos
BrowseOnlineMimeTypeimage/jpeg
ShortNameGLAH06
LongNameGLAS/ICESat L1B Global Elevation Data (HDF5)
CollectionDescriptionData granules contain approximately 23 minutes (1/4 orbit) and include the surface elevation, surface roughness assuming no slope, surface slope assuming no roughness and geodetic and atmospheric corrections for the range at the full 40/sec resolution.
VersionID34
CitationforExternalPublicationThe data used in this study were produced by the GLAS Science Team at the ICESat Science Investigator-led Processing System (I-SIPS) at NASA/GSFC. The data archive site is the NSIDC DAAC.
CollectionStateIn Work
MaintenanceandUpdateFrequencyDaily
AccessConstraintsData may not be reproduced or distributed without including the CitationForExternalPublication for this product included in this Metadata. Data may not be distributed in an altered form without the written permission of the GLAS Science Team.
TemporalKeywordDay
SpatialKeywordGlobal

/METADATA/COLLECTIONMETADATA/AdditionalAttributes

Attribute Example Value
PercentGroundHitAdditionalAttributesContainer
OrbitQualityAdditionalAttributesContainer
TrackAdditionalAttributesContainer
Track_SegmentAdditionalAttributesContainer
Instrument_StateAdditionalAttributesContainer
ReferenceOrbitAdditionalAttributesContainer
CycleAdditionalAttributesContainer
SP_ICE_PATH_NOAdditionalAttributesContainer
SP_ICE_GLAS_StartBlockAdditionalAttributesContainer
SP_ICE_GLAS_EndBlockAdditionalAttributesContainer
InstanceAdditionalAttributesContainer
Range_BiasAdditionalAttributesContainer
Instrument_State_DateAdditionalAttributesContainer
Instrument_State_TimeAdditionalAttributesContainer
Range_Bias_DateAdditionalAttributesContainer
Range_Bias_TimeAdditionalAttributesContainer
Timing_BiasAdditionalAttributesContainer
Timing_Bias_DateAdditionalAttributesContainer
Timing_Bias_TimeAdditionalAttributesContainer
Timing_DriftAdditionalAttributesContainer
Timing_Drift_DateAdditionalAttributesContainer
Timing_Drift_TimeAdditionalAttributesContainer
identifier_product_doiAdditionalAttributesContainer
identifier_file_uuidAdditionalAttributesContainer
identifier_product_doi_authorityAdditionalAttributesContainer

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Cycle

Attribute Example Value
AdditionalAttributeDatatypeint
AdditionalAttributeDescriptionA count of the number of exact repeats of this reference orbit.
AdditionalAttributeNameCycle
ParameterUnitsofMeasurementcounts
ParameterRangeBegin0
ParameterRangeEnd250

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Instance

Attribute Example Value
AdditionalAttributeDatatypeint
AdditionalAttributeDescriptionThe number of times that we have returned to a specific reference orbit.
AdditionalAttributeNameInstance
ParameterUnitsofMeasurementcounts
ParameterRangeBegin1
ParameterRangeEnd99

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Instrument_State

Attribute Example Value
AdditionalAttributeDatatypeint
AdditionalAttributeDescriptionFlag word that indicates which redundant units (laser, detector, oscillator) of the GLAS instrument are in operation.
AdditionalAttributeNameInstrument_State
ParameterUnitsofMeasurementFlag word
ParameterRangeBegin0
ParameterRangeEnd5

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Instrument_State_Date

Attribute Example Value
AdditionalAttributeDatatypedate
AdditionalAttributeDescriptionThe date that corresponds to the first valid Instrument_State. There are a maximum of two per granule.
AdditionalAttributeNameInstrument_State_Date

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Instrument_State_Time

Attribute Example Value
AdditionalAttributeDatatypetime
AdditionalAttributeDescriptionThe time that corresponds to the first valid Instrument_State. There are a maximum of two per granule.
AdditionalAttributeNameInstrument_State_Time

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/OrbitQuality

Attribute Example Value
AdditionalAttributeDatatypevarchar
AdditionalAttributeDescriptionStatus word that states what type of orbit was used during processing of the data for the granule. It specifies the models used in the orbit determination program. This provides an indication of the quality of the orbits being applied to the data.
AdditionalAttributeNameOrbitQuality
ParameterUnitsofMeasurementFlag

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/PercentGroundHit

Attribute Example Value
AdditionalAttributeDatatypefloat
AdditionalAttributeDescriptionPercent of data for this granule that had a detected ground return of the transmitted laser pulse.
AdditionalAttributeNamePercentGroundHit
ParameterUnitsofMeasurementPercent
ParameterRangeBegin0.0
ParameterRangeEnd100.0
ParameterValueAccuracy1
ParameterMeasurementResolution1

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Range_Bias

Attribute Example Value
AdditionalAttributeDatatypeint
AdditionalAttributeDescriptionThe additive calibration correction in millimeters to apply to range based on the science team cal/val activities.
AdditionalAttributeNameRange_Bias
ParameterUnitsofMeasurementMillimeters
ParameterRangeBegin-10000
ParameterRangeEnd10000
ParameterValueAccuracy1
ParameterMeasurementResolution1

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Range_Bias_Date

Attribute Example Value
AdditionalAttributeDatatypedate
AdditionalAttributeDescriptionThe date that corresponds to the first valid Range_Bias. There are a maximum of two per granule.
AdditionalAttributeNameRange_Bias_Date

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Range_Bias_Time

Attribute Example Value
AdditionalAttributeDatatypetime
AdditionalAttributeDescriptionThe time that corresponds to the first valid Range_Bias. There are a maximum of two per granule.
AdditionalAttributeNameRange_Bias_Time

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/ReferenceOrbit

Attribute Example Value
AdditionalAttributeDatatypeint
AdditionalAttributeDescriptionAssigned number for which exact orbital elements describe the exact repeat orbit pattern.
AdditionalAttributeNameReferenceOrbit
ParameterUnitsofMeasurementAssigned number
ParameterRangeBegin1
ParameterRangeEnd30000

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/SP_ICE_GLAS_EndBlock

Attribute Example Value
AdditionalAttributeDatatypeint
AdditionalAttributeDescriptionInteger number within GLAS coverage scheme in which granule data ends.
AdditionalAttributeNameSP_ICE_GLAS_EndBlock
ParameterRangeBegin1
ParameterRangeEnd360

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/SP_ICE_GLAS_StartBlock

Attribute Example Value
AdditionalAttributeDatatypeint
AdditionalAttributeDescriptionInteger number within GLAS coverage scheme in which granule data starts.
AdditionalAttributeNameSP_ICE_GLAS_StartBlock
ParameterRangeBegin1
ParameterRangeEnd360

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/SP_ICE_PATH_NO

Attribute Example Value
AdditionalAttributeDatatypeint
AdditionalAttributeDescriptionNumber which represents the GLAS path number.
AdditionalAttributeNameSP_ICE_PATH_NO
ParameterRangeBegin1
ParameterRangeEnd32768

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Timing_Bias

Attribute Example Value
AdditionalAttributeDatatypeint
AdditionalAttributeDescriptionThe time tag error determined by the calibration team that was added to the time tags to compute the true time of data as provided on the granule.
AdditionalAttributeNameTiming_Bias
ParameterUnitsofMeasurementMicroseconds
ParameterRangeBegin-1000000
ParameterRangeEnd+1000000

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Timing_Bias_Date

Attribute Example Value
AdditionalAttributeDatatypedate
AdditionalAttributeDescriptionThe date that corresponds to the first valid Timing_Bias. There are a maximum of two per granule.
AdditionalAttributeNameTiming_Bias_Date

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Timing_Bias_Time

Attribute Example Value
AdditionalAttributeDatatypetime
AdditionalAttributeDescriptionThe time that corresponds to the first valid Timing_Bias. There are a maximum of two per granule.
AdditionalAttributeNameTiming_Bias_Time

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Timing_Drift

Attribute Example Value
AdditionalAttributeDatatypefloat
AdditionalAttributeDescriptionThis is the ratio of the true time for a one second oscilator tick to nominal one
AdditionalAttributeNameTiming_Drift
ParameterRangeBegin-1.0
ParameterRangeEnd+1.0

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Timing_Drift_Date

Attribute Example Value
AdditionalAttributeDatatypedate
AdditionalAttributeDescriptionThe date that corresponds to the first valid Timing_Drift. There are a maximum of two per granule.
AdditionalAttributeNameTiming_Drift_Date

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Timing_Drift_Time

Attribute Example Value
AdditionalAttributeDatatypetime
AdditionalAttributeDescriptionThe time that corresponds to the first valid Timing_Drift. There are a maximum of two per granule.
AdditionalAttributeNameTiming_Drift_Time

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Track

Attribute Example Value
AdditionalAttributeDatatypeint
AdditionalAttributeDescriptionThe unique number assigned for each repeat ground track (one orbit) of the reference orbit.
AdditionalAttributeNameTrack
ParameterUnitsofMeasurementcounts
ParameterRangeBegin0
ParameterRangeEnd3000

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Track_Segment

Attribute Example Value
AdditionalAttributeDatatypeint
AdditionalAttributeDescriptionNumber assigned for the specific latitude segment (1 = +50 to +50, 2 = +50 to -50, 3 = -50 to -50, 4 = -50 to +50) of the track for the data.
AdditionalAttributeNameTrack_Segment
ParameterUnitsofMeasurementcounts
ParameterRangeBegin1
ParameterRangeEnd4

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/identifier_file_uuid

Attribute Example Value
AdditionalAttributeDatatypevarchar
AdditionalAttributeDescriptionUniversally unique identifier for this data product's files
AdditionalAttributeNameidentifier_file_uuid

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/identifier_product_doi

Attribute Example Value
AdditionalAttributeDatatypevarchar
AdditionalAttributeDescriptionDigital object identifier that uniquely identifies this data product
AdditionalAttributeNameidentifier_product_doi

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/identifier_product_doi/InformationContent

Attribute Example Value
ParameterValue10.5067/ICESAT/GLAS/DATA109

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/identifier_product_doi_authority

Attribute Example Value
AdditionalAttributeDatatypevarchar
AdditionalAttributeDescriptionURL of the digital object identifier resolving authority
AdditionalAttributeNameidentifier_product_doi_authority

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/identifier_product_doi_authority/InformationContent

Attribute Example Value
ParameterValuehttp://dx.doi.org

/METADATA/COLLECTIONMETADATA/CSDTDescription

Attribute Example Value
PrimaryCSDTn-Dim Array of Records
IndirectReferencetracks/orbits
ImplementationHDF
CSDTCommentsData for each orbit is divided into four granules. Lat +50 to +50, Lat +50 to -50, Lat -50 to -50, Lat -50 to +50.

/METADATA/COLLECTIONMETADATA/CollectionAssociation

Attribute Example Value
GLAH05CollectionAssociationContainer
GLAH01CollectionAssociationContainer
GLA00CollectionAssociationContainer
GLAH12CollectionAssociationContainer
GLAH13CollectionAssociationContainer
GLAH14CollectionAssociationContainer
GLAH15CollectionAssociationContainer

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLA00

Attribute Example Value
CollectionTypeScience Associated
CollectionUseThe initial collection of GLAS instrument data downlinked from the spacecraft
ShortNameGLA00
VersionID1

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH01

Attribute Example Value
CollectionTypeScience Associated
CollectionUseLevel 1A file containing: altimeter height, waveform data, and other data required to produce the Level 1B waveform products.
ShortNameGLAH01
VersionID33

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH05

Attribute Example Value
CollectionTypeInput
CollectionUseLevel 1B file containing: the range, corrections to the range from the waveform retracking algorithms, the surface roughness estimate, and the reflectance. GLAH05 provides the range corrections and waveform analysis results needed to compute the elevation.
ShortNameGLAH05
VersionID34

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH12

Attribute Example Value
CollectionTypeDependent
CollectionUseLevel 2 file containing: corrected ice sheet elevations above the reference ellipsoid, surface roughness, reflectance, and the corrections that were used. The product parameters are the result of product-specialized waveform fitting.
ShortNameGLAH12
VersionID34

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH13

Attribute Example Value
CollectionTypeDependent
CollectionUseLevel 2 file containing: Sea Ice Elevation, Reflectancce, and Roughness, Ice Berg Elevations and Roughness. The product parameters are the result of product-specialized waveform fitting.
ShortNameGLAH13
VersionID34

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH14

Attribute Example Value
CollectionTypeDependent
CollectionUseLevel 2 file containing: corrected surface elevations above the reference ellipsoid, surface roughness, reflectance, and the corrections that were used. The product parameters are the result of product-specialized waveform fitting.
ShortNameGLAH14
VersionID34

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH15

Attribute Example Value
CollectionTypeDependent
CollectionUseLevel 2 file containing: corrected Ocean elevations above the reference ellipsoid, surface roughness, reflectance, and the corrections that were used. The product parameters are the result of product-specialized waveform fitting.
ShortNameGLAH15
VersionID34

/METADATA/COLLECTIONMETADATA/ContactOrganization

Attribute Example Value
Data_OriginatorContactOrganizationContainer
ArchiveContactOrganizationContainer

/METADATA/COLLECTIONMETADATA/ContactOrganization/Archive

Attribute Example Value
RoleArchive
HoursofServiceM-F, 8:00am to 5:00pm, Mountain Time
ContactInstructionsFor inquiries, contact NSIDC User Services. Primary first level contact.
ContactOrganizationNameNSIDC User Services
StreetAddressCIRES/NSIDC University of Colorado Campus, Box 449
CityBoulder
StateProvinceColorado
PostalCode80309-0449
CountryUSA
TelephoneNumber303-492-2468
TelephoneNumberTypeFacsimile
ElectronicMailAddressnsidc@nsidc.org

/METADATA/COLLECTIONMETADATA/ContactOrganization/Data_Originator

Attribute Example Value
RoleData Originator
HoursofServiceM-F, 8:00am to 4:30pm Eastern Time
ContactInstructionsContact by e-mail first
ContactOrganizationNameICESat Science Investigator-led Processing System (I-SIPS)
StreetAddressBuilding 33, NASA Goddard Space Flight Center
CityGreenbelt
StateProvinceMaryland
PostalCode20771
CountryUSA
TelephoneNumber757-864-1238
TelephoneNumberTypeVoice
ElectronicMailAddressDavid.W.Hancock@nasa.gov

/METADATA/COLLECTIONMETADATA/ContactPerson

Attribute Example Value
HancockContactPersonContainer
SchutzContactPersonContainer
ZwallyContactPersonContainer
DiMarzioContactPersonContainer

/METADATA/COLLECTIONMETADATA/ContactPerson/DiMarzio

Attribute Example Value
RoleProducer
HoursofServiceM-F, 8:00am to 4:30pm Eastern Time
ContactInstructionsNone
ContactJobPositionDeputy Science Software Development Manager
ContactFirstNameJohn
ContactMiddleNameP
ContactLastNameDiMarzio
StreetAddressBuilding 33, Rm. B-209D, NASA/GSFC
CityGreenbelt
StateProvinceMaryland
PostalCode20771
CountryUSA
TelephoneNumber301-614-5893
TelephoneNumberTypeVoice
ElectronicMailAddressJohn.P.Dimarzio.1@nasa.gov

/METADATA/COLLECTIONMETADATA/ContactPerson/Hancock

Attribute Example Value
RoleData Originator
HoursofServiceM-F, 8:00am to 4:30pm. Eastern Time.
ContactInstructionsNone
ContactJobPositionScience Software Development Manager.
ContactFirstNameDavid
ContactMiddleNameW.
ContactLastNameHancock
StreetAddressBuilding N-159, NASA/GSFC Wallops Flight Facility.
CityWallops Island
StateProvinceVirginia
PostalCode23337
CountryUSA
TelephoneNumber757-824-1238
TelephoneNumberTypeVoice
ElectronicMailAddressDavid.W.Hancock@nasa.gov

/METADATA/COLLECTIONMETADATA/ContactPerson/Schutz

Attribute Example Value
RoleInvestigator
HoursofServiceM-F, 8:00am to 4:30pm Central Time
ContactInstructionsNone
ContactJobPositionGLAS Science Team Leader
ContactFirstNameBob
ContactMiddleNameE
ContactLastNameSchutz
StreetAddress3925 W. Braker Lane, Center for Space Research
CityAustin
StateProvinceTexas
PostalCode78759-5321
CountryUSA
TelephoneNumber512-471-4267
TelephoneNumberTypeVoice
ElectronicMailAddressschutz@utcsr.ae.utexas.edu

/METADATA/COLLECTIONMETADATA/ContactPerson/Zwally

Attribute Example Value
RoleProducer
HoursofServiceM-F, 8:00am to 4:30pm Eastern Time
ContactInstructionsNone.
ContactJobPositionICESat Project Scientist
ContactFirstNameJay
ContactLastNameZwally
StreetAddressBuilding 33, Rm A-217
CityGreenbelt
StateProvinceMaryland
PostalCode20771
CountryUSA
TelephoneNumber301-614-5643
TelephoneNumberTypeVoice
ElectronicMailAddressJay.Zwally@nasa.gov

/METADATA/COLLECTIONMETADATA/DisciplineTopicParameters

Attribute Example Value
HydrosphereDisciplineTopicParametersContainer
Land_SurfaceDisciplineTopicParametersContainer
CryosphereDisciplineTopicParametersContainer
OceansDisciplineTopicParametersContainer

/METADATA/COLLECTIONMETADATA/DisciplineTopicParameters/Cryosphere

Attribute Example Value
ECSDisciplineKeywordEarth Science
ECSTopicKeywordCryosphere
ECSTermKeywordSea Ice
ECSVariableKeywordIce Roughness

/METADATA/COLLECTIONMETADATA/DisciplineTopicParameters/Cryosphere/ECSParameter

Attribute Example Value
ECSParameterKeywordLaser Reflectance

/METADATA/COLLECTIONMETADATA/DisciplineTopicParameters/Hydrosphere

Attribute Example Value
ECSDisciplineKeywordEarth Science
ECSTopicKeywordHydrosphere
ECSTermKeywordGlaciers/Ice Sheets
ECSVariableKeywordGlacier Elevation/Ice Sheet Elevation

/METADATA/COLLECTIONMETADATA/DisciplineTopicParameters/Land_Surface

Attribute Example Value
ECSDisciplineKeywordEarth Science
ECSTopicKeywordLand Surface
ECSTermKeywordSurface Radiative Properties
ECSVariableKeywordReflectance

/METADATA/COLLECTIONMETADATA/DisciplineTopicParameters/Land_Surface/ECSParameter

Attribute Example Value
ECSParameterKeywordLaser Reflectance

/METADATA/COLLECTIONMETADATA/DisciplineTopicParameters/Oceans

Attribute Example Value
ECSDisciplineKeywordEarth Science
ECSTopicKeywordOceans
ECSTermKeywordSea Surface Topography
ECSVariableKeywordSea Surface Height

/METADATA/COLLECTIONMETADATA/DisciplineTopicParameters/Oceans/ECSParameter

Attribute Example Value
ECSParameterKeywordLaser Reflectance

/METADATA/COLLECTIONMETADATA/ECSCollection

Attribute Example Value
RevisionDate2013-11-07
SuggestedUsageScientists investigating surface elevation, slope, reflection, and other surface characteristics can use the GLAH06 data. The data values were used in the creation of the surface-specific altimeter products (GLAH12-15). Each GLAH06 file was created from an equivalent GLA06 binary formatted file. Users that want to access the data used to create the GLAH06 values can use the equivalent GLAHxx files for the GLAxx files as shown in the provenance metadata for the history that created the GLA06.
ProcessingCenterGSFC I-SIPS
ArchiveCenterNSIDC
VersionDescriptionGLASHDF V2.0-Elevations for all products except GLAH14 are now based on the range from the Gaussian fit to the transmit pulse to the Gaussian fit to the received echo. Range used for trop corrections was changed from threshold to centroid.(See Rel Notes)
DatasetDisclaimerPointerhttp://nsidc.org/data/icesat/disclaimer.html
ECSCollectionGuidePointerhttp://nsidc.org/data/docs/daac/glas_icesat_l1_l2_global_altimetry.gd.html
ECSCollectionGuidePointerCommentGuide Document for this product at NSIDC
MiscellaneousInformationPointerhttp://nsidc.org/daac/icesat/index.html
MiscellaneousInformationPointerCommentGLAS Product page at NSIDC

/METADATA/COLLECTIONMETADATA/Platform

Attribute Example Value
ICESatPlatformContainer

/METADATA/COLLECTIONMETADATA/Platform/ICESat

Attribute Example Value
PlatformShortNameICESat
PlatformLongNameIce, Cloud, and Land Elevation Satellite
PlatformTypeSpacecraft

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument

Attribute Example Value
GLASInstrumentContainer
GPSInstrumentContainer

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GLAS

Attribute Example Value
InstrumentShortNameGLAS
InstrumentLongNameGeoscience Laser Altimeter System
InstrumentTechniqueLaser Altimetry and Light Detection and Radar
NumberofSensors3

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GLAS/InstrumentCharacteristic

Attribute Example Value
SwathWidthInstrumentCharacteristicContainer

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GLAS/InstrumentCharacteristic/SwathWidth

Attribute Example Value
InstrumentCharacteristicNameSwathWidth
InstrumentCharacteristicDescriptionThe width of the sensor scan as the satellite moves along the ground track.
InstrumentCharacteristicDataTypeint
InstrumentCharacteristicUnitkilometers
InstrumentCharacteristicValue2

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GLAS/Sensor

Attribute Example Value
LASensorContainer
PCSensorContainer
CDSensorContainer

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GLAS/Sensor/CD

Attribute Example Value
SensorShortNameCD
SensorLongNameCloud LIDAR
SensorTechniqueMeasure of 1064nm return energy in 75m bins from 20km to surface

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GLAS/Sensor/CD/SensorCharacteristic

Attribute Example Value
wavelengthSensorCharacteristicContainer

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GLAS/Sensor/CD/SensorCharacteristic/wavelength

Attribute Example Value
SensorCharacteristicNamewavelength
SensorCharacteristicDescriptiondetector
SensorCharacteristicDataTypevarchar
SensorCharacteristicUnitnanometer
SensorCharacteristicValue1064 nm

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GLAS/Sensor/LA

Attribute Example Value
SensorShortNameLA
SensorLongNameLaser Altimeter
SensorTechniqueExact Measurement of Time between Transmit Pulse and receive ground return

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GLAS/Sensor/LA/SensorCharacteristic

Attribute Example Value
wavelengthSensorCharacteristicContainer
waveformSensorCharacteristicContainer

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GLAS/Sensor/LA/SensorCharacteristic/waveform

Attribute Example Value
SensorCharacteristicNamewaveform
SensorCharacteristicDescriptiondigitizer
SensorCharacteristicDataTypevarchar
SensorCharacteristicUnitcounts
SensorCharacteristicValue0-255

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GLAS/Sensor/LA/SensorCharacteristic/wavelength

Attribute Example Value
SensorCharacteristicNamewavelength
SensorCharacteristicDescriptiontransmission
SensorCharacteristicDataTypevarchar
SensorCharacteristicUnitnanometer
SensorCharacteristicValue1064 nm

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GLAS/Sensor/PC

Attribute Example Value
SensorShortNamePC
SensorLongNamePhoton Counter for the 532 nm Aerosol Returns
SensorTechniqueCounting of 532nm photon return in 75m bins 40km to surface

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GLAS/Sensor/PC/SensorCharacteristic

Attribute Example Value
wavelengthSensorCharacteristicContainer

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GLAS/Sensor/PC/SensorCharacteristic/wavelength

Attribute Example Value
SensorCharacteristicNamewavelength
SensorCharacteristicDescriptiondetector
SensorCharacteristicDataTypevarchar
SensorCharacteristicUnitnanometer
SensorCharacteristicValue532nm

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GPS

Attribute Example Value
InstrumentShortNameGPS
InstrumentLongNameGlobal Positioning System Receiver
InstrumentTechniqueRadionavigation
NumberofSensors1

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GPS/Sensor

Attribute Example Value
GPS_ReceiverSensorContainer

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument/GPS/Sensor/GPS_Receiver

Attribute Example Value
SensorShortNameGPS Receiver
SensorLongNameDual frequency GPS receiver
SensorTechniquePseudorange and carrier phase

/METADATA/COLLECTIONMETADATA/Platform/ICESat/PlatformCharacteristic

Attribute Example Value
OrbitInclinationPlatformCharacteristicContainer
OrbitalPeriodPlatformCharacteristicContainer

/METADATA/COLLECTIONMETADATA/Platform/ICESat/PlatformCharacteristic/OrbitInclination

Attribute Example Value
PlatformCharacteristicNameOrbitInclination
PlatformCharacteristicDescriptionAngle between the orbit plane and the Earth's equatorial plane
PlatformCharacteristicDataTypefloat
PlatformCharacteristicUnitDegrees
PlatformCharacteristicValue94.0

/METADATA/COLLECTIONMETADATA/Platform/ICESat/PlatformCharacteristic/OrbitalPeriod

Attribute Example Value
PlatformCharacteristicNameOrbitalPeriod
PlatformCharacteristicDescriptionOrbital period in decimal minutes.
PlatformCharacteristicDataTypefloat
PlatformCharacteristicUnitMinutes
PlatformCharacteristicValue96.7

/METADATA/COLLECTIONMETADATA/ProcessingLevel

Attribute Example Value
ProcessingLevelDescriptionGeophysical Quantities at the sensor resolution or geolocated
ProcessingLevelID1B

/METADATA/COLLECTIONMETADATA/Spatial

Attribute Example Value
SpatialCoverageTypeHorizontal
WestBoundingCoordinate-180.0
NorthBoundingCoordinate90.0
EastBoundingCoordinate180.0
SouthBoundingCoordinate-90.0

/METADATA/COLLECTIONMETADATA/StorageMediumClass

Attribute Example Value
StorageMediumOnline

/METADATA/COLLECTIONMETADATA/Temporal

Attribute Example Value
TimeTypeUTC
DateTypeJ2000
TemporalRangeTypeContinuous Range
PrecisionofSeconds2
EndsatPresentFlagY
RangeBeginningDate2003-01-13
RangeBeginningTime00:00:00
RangeEndingDate2010-01-13
RangeEndingTime00:00:00

/METADATA/INVENTORYMETADATA

Attribute Example Value
PGEVersionVersion 1.4
ShortNameGLAH06
VersionID34
RangeBeginningTime01:51:38
RangeEndingTime02:12:57
RangeBeginningDate2003-11-18
RangeEndingDate2003-11-18

/METADATA/INVENTORYMETADATA/ECSDataGranule

Attribute Example Value
ReprocessingPlannedno further update anticipated
ReprocessingActualreprocessed
LocalGranuleIDGLAH06_634_2103_002_0407_1_01_0001.H5
ProductionDateTime2014-08-19T06:14:49
LocalVersionID634

/METADATA/INVENTORYMETADATA/InputGranule

Attribute Example Value
InputPointerCTL00_000_20140818_2614398_01_gla06_h5_convert.ctl, tai-utc.dat, GLA06_634_2103_002_0407_1_01_0001.DAT, DsESDTGlGLAH06.034.desc

/METADATA/INVENTORYMETADATA/MeasuredParameter

Attribute Example Value
ParameterNameSurface_Elevation, Surface_Reflectance

/METADATA/INVENTORYMETADATA/OrbitCalculatedSpatialDomain

Attribute Example Value
OrbitNumber4604
StartOrbitNumber4604
StopOrbitNumber4604
EquatorCrossingLongitude-103.22287
EquatorCrossingTime01:38:10
EquatorCrossingDate2003-11-18

/METADATA/INVENTORYMETADATA/ProductSpecificMetadata

Attribute Example Value
PercentGroundHit0
OrbitQuality6
Track407
Track_Segment1
Instrument_State373338
ReferenceOrbit1
Cycle2
SP_ICE_PATH_NO3429
SP_ICE_GLAS_StartBlockNOT SET
SP_ICE_GLAS_EndBlockNOT SET
Instance3
Range_Bias0
Instrument_State_Date2003-10-30
Instrument_State_Time00:00:00
Range_Bias_Date2003-10-30
Range_Bias_Time00:00:00
Timing_Bias0
Timing_Bias_Date2003-10-30
Timing_Bias_Time00:00:00
identifier_product_doi10.5067/ICESAT/GLAS/DATA109
identifier_file_uuidc0cfb553-496d-4dea-b353-0d89dc66e98f
identifier_product_doi_authorityhttp://dx.doi.org

/METADATA/PROVENANCE

/METADATA/PROVENANCE/STEP_1

Attribute Example Value
ProcessDateTime2014-05-24T04:16:41

/METADATA/PROVENANCE/STEP_1/ProcessAgent

Attribute Example Value
Nameglas_alt
Type1B
Version6.1
DescriptionThis process is an instantiation of the GLAS Science Algorithm Software (GSAS) 1B ATBDs.

/METADATA/PROVENANCE/STEP_1/ProcessInput

Attribute Example Value
NameGLA05_634_2103_002_0407_1_01_0001.DAT, GLA09_633_2103_002_0407_0_01_0001.DAT, GLA11_633_2103_002_0407_0_01_0001.DAT, ANC01_006_20031117_180000_01_0000.DAT, ANC01_006_20031118_000000_01_0000.DAT, ANC01_006_20031117_180000_01_0002.DAT, ANC01_006_20031118_000000_01_0002.DAT, ANC01_006_20031117_180000_01_0003.DAT, ANC01_006_20031118_000000_01_0003.DAT, ANC01_006_20031117_180000_01_0004.DAT, ANC01_006_20031118_000000_01_0004.DAT, ANC01_006_20031117_180000_01_0001.DAT, ANC01_006_20031118_000000_01_0001.DAT, ANC01_006_20031117_180000_01_0005.DAT, ANC01_006_20031118_000000_01_0005.DAT, ANC01_006_20031117_180000_01_0006.DAT, ANC01_006_20031118_000000_01_0006.DAT, ANC01_006_20031117_180000_01_0007.DAT, ANC01_006_20031118_000000_01_0007.DAT, ANC01_006_20031117_180000_01_0008.DAT, ANC01_006_20031118_000000_01_0008.DAT, ANC01_006_20031117_180000_01_0009.DAT, ANC01_006_20031118_000000_01_0009.DAT, ANC01_006_20031117_180000_01_0010.DAT, ANC01_006_20031118_000000_01_0010.DAT, ANC04_007_20031117_235947_01_0001.DAT, anc07_034_01_0000.dat, anc07_034_01_0001.dat, anc07_034_01_0002.dat, anc07_034_01_0003.dat, anc07_034_01_0004.dat, anc07_034_01_0005.dat, anc07_034_01_0006.dat, ANC08_015_20031117_235947_01_0001.DAT, ANC09_076_20031117_235947_01_0001.DAT, anc12_004_01_0000.dat, anc12_004_01_0001.dat, anc13_006_01_0000.dat, anc16_004_01_0000.dat, anc17_004_01_0000.dat, anc25_005_20090101_000000_01_0000.dat, anc27_001_01_0000.dat, anc27_001_01_0001.dat, ANC33_001_20100406_000000_01_0000.DAT, anc41_009_01_0000.dat, anc45_034_01_0001.dat, anc45_034_01_0002.dat, anc45_034_01_0003.dat, anc45_034_01_0004.dat, anc45_034_01_0005.dat, anc45_034_01_0006.dat, anc45_034_01_0007.dat, anc45_034_01_0008.dat, anc45_034_01_0009.dat, anc45_034_01_0010.dat, anc45_034_01_0011.dat, anc45_034_01_0012.dat, anc45_034_01_0013.dat, anc45_034_01_0014.dat, anc45_034_01_0015.dat, anc51_007_01_3429.dat, anc51_007_01_3430.dat, anc51_007_01_3431.dat, anc51_007_01_3432.dat, anc51_007_01_3433.dat, anc51_007_01_3434.dat, anc51_007_01_3435.dat, anc51_007_01_3436.dat, anc51_007_01_3437.dat, anc51_007_01_3438.dat, anc51_007_01_3439.dat, anc51_007_01_3440.dat, anc51_007_01_3441.dat, anc51_007_01_3442.dat, anc51_007_01_3443.dat, anc52_007_01_0001.dat, anc52_007_01_0002.dat, anc54_002_01_0001.dat, anc54_002_01_0002.dat, anc54_002_01_0003.dat, anc54_002_01_0004.dat, anc54_002_01_0005.dat, anc54_002_01_0006.dat, anc55_001_01_0000.dat, ANC56_001_20090707_000000_01_0000.DAT, ANC57_001_20101119_000000_01_0000.DAT, anc58_002_01_3429.dat, anc58_002_01_3430.dat, anc58_002_01_3431.dat, anc58_002_01_3432.dat, anc58_002_01_3433.dat, anc58_002_01_3434.dat, anc58_002_01_3435.dat, anc58_002_01_3436.dat, anc58_002_01_3437.dat, anc58_002_01_3438.dat, anc58_002_01_3439.dat, anc58_002_01_3440.dat, anc58_002_01_3441.dat, anc58_002_01_3442.dat, anc58_002_01_3443.dat
TypeGLA05, GLA09, GLA11, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC04, anc07, anc07, anc07, anc07, anc07, anc07, anc07, ANC08, ANC09, anc12, anc12, anc13, anc16, anc17, anc25, anc27, anc27, ANC33, anc41, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc51, anc51, anc51, anc51, anc51, anc51, anc51, anc51, anc51, anc51, anc51, anc51, anc51, anc51, anc51, anc52, anc52, anc54, anc54, anc54, anc54, anc54, anc54, anc55, ANC56, ANC57, anc58, anc58, anc58, anc58, anc58, anc58, anc58, anc58, anc58, anc58, anc58, anc58, anc58, anc58, anc58
Version634, 633, 633, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 007, 034, 034, 034, 034, 034, 034, 034, 015, 076, 004, 004, 006, 004, 004, 005, 001, 001, 001, 009, 034, 034, 034, 034, 034, 034, 034, 034, 034, 034, 034, 034, 034, 034, 034, 007, 007, 007, 007, 007, 007, 007, 007, 007, 007, 007, 007, 007, 007, 007, 007, 007, 002, 002, 002, 002, 002, 002, 001, 001, 001, 002, 002, 002, 002, 002, 002, 002, 002, 002, 002, 002, 002, 002, 002, 002

/METADATA/PROVENANCE/STEP_1/ProcessOutput

Attribute Example Value
NameGLA06_634_2103_002_0407_1_01_0001.DAT
TypeGLA06
Version634

/METADATA/PROVENANCE/STEP_2

Attribute Example Value
ProcessDateTime2014-08-19T06:14:49.000000Z

/METADATA/PROVENANCE/STEP_2/ProcessAgent

Attribute Example Value
NameGLA06_h5_convert
TypeData_Reformat
VersionVersion 1.4 (July 2014)
DescriptionGLA06 Conversion PGE

/METADATA/PROVENANCE/STEP_2/ProcessInput

Attribute Example Value
Name./CTL00_000_20140818_2614398_01_gla06_h5_convert.ctl, ./tai-utc.dat, ./GLA06_634_2103_002_0407_1_01_0001.DAT, ./DsESDTGlGLAH06.034.desc
TypeIN_CNTL, IN_ANC_TAIUTC, IN_GLA06, IN_ESDT
Version0, 0, 1, 1

/METADATA/PROVENANCE/STEP_2/ProcessOutput

Attribute Example Value
Name./GLAH06_634_2103_002_0407_1_01_0001.H5
TypeOUT_GLAH06
Version1
UUIDc0cfb553-496d-4dea-b353-0d89dc66e98f
DOI10.5067/ICESAT/GLAS/DATA109

Page last updated: 09/03/14