GLAH05 Product Data Dictionary

File-Level (Global) Attributes

Attribute Example Value
featureType timeSeries
ShortName GLAH05
title GLAS/ICESat L1B Global Waveform-based Range Corrections Data (HDF5)
comment The level 1B waveform parameterization data will contain waveform-based range corrections and surface characteristics at the full 40 per second resolution. Data granules will contain approximately 23 minutes (1/4 orbit) of data.
summary GLAH05 contains scientific investigations of surface features defined by the waveform parameterization. File contains range corrections and the parameterizations of the waveform that were used to calculate surface elevation, and other surface characteristics. The data values were used as input data values to compute parameters on GLAH06 and GLAH12-15. Each GLAH05 file was created from an equivalent GLA05 binary formatted file. The provenance metadata shows the history that created the GLA05.
license http://nsidc.org/data/icesat/disclaimer.html
references http://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)
AccessConstraints Data 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.
CitationforExternalPublication The 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_role Data Originator, Investigator, Producer, Producer
contributor_name David 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_name ICESat Science Investigator-led Processing System (I-SIPS)
creator_email David.W.Hancock@nasa.gov
publisher_name NSIDC User Services
publisher_email nsidc@nsidc.org
publisher_url http://nsidc.org/daac/icesat/index.html
platform Ice, Cloud, and Land Elevation Satellite (ICESat)
instrument Geoscience Laser Altimeter System (GLAS)
processing_level 1B
date_created 2014-08-19T06:08:34
spatial_coverage_type Horizontal
history 2014-05-24T04:01:03 glas_alt 6.1 GLA05_634_2103_002_0407_1_01_0001.DAT, 2014-08-19T06:08:34.000000Z GLA05_h5_convert Version 1.4 (July 2014) ./GLAH05_634_2103_002_0407_1_01_0001.H5
geospatial_lat_min -90.0
geospatial_lat_max 90.0
geospatial_lon_min -180.0
geospatial_lon_max 180.0
geospatial_lat_units degrees_north
geospatial_lon_units degrees_east
keywords Earth Science > Land Surface > Topography > Terrain Elevation, Earth Science > Hydrosphere > Glaciers/Ice Sheets > Glacier Elevation/Ice Sheet Elevation, Earth Science > Cryosphere > Glaciers/Ice Sheets > Glacier Elevation/Ice Sheet Elevation
keywords_vocabulary GCMD Science Keywords Version 6.0
standard_name_vocabulary not_set
naming_authority http://dx.doi.org
project Ice, Cloud, and Land Elevation Satellite (GLAS_HDF)
time_type UTC
date_type J2000
time_coverage_start 2003-11-18T01:51:38
time_coverage_end 2003-11-18T02:12:57
time_coverage_duration 1620
source Satellite Measurements
HDFVersion HDF5 1.8.9
identifier_file_uuid 2868de04-82ed-4282-94b3-24f078a309d8
identifier_product_doi 10.5067/ICESAT/GLAS/DATA108
identifier_product_type GLAH05
identifier_product_format_version 1.0
Conventions CF-1.6
institution National Aeronautics and Space Administration (NASA)


Group: /Data_1HZ

This group contain 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

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
DS_UTCTime_1 DOUBLE
(UNLIMITED)
Transmit Time of First Shot in frame in J2000
(time)
seconds since 2000-01-01 12:00:00 UTC The 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 Data NOT_SET

Group: Data_1HZ/Time

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

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
i_rec_ndx INTEGER
(UNLIMITED)
GLAS Record Index
(NOT_SET)
NOT_SET Unique index that relates this record to the corresponding record(s) in each GLAS data product. Rel 34 GLAS Binary Data DS_UTCTime_1
i_shot_count INTEGER
(UNLIMITED)
GLAS shot counter
(NOT_SET)
NOT_SET Identifies 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 Data DS_UTCTime_1
d_transtime DOUBLE
(UNLIMITED)
One way transit time
(NOT_SET)
seconds One 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 orbit Rel 34 GLAS Binary Data DS_UTCTime_1
d_deltagpstmcor DOUBLE
(UNLIMITED)
Delta GPS time correction
(NOT_SET)
seconds The high frequency delta GPS time correction calculated during the precision orbit processing step. Rel 34 GLAS Binary Data DS_UTCTime_1
shot_time_flg INTEGER_1
(UNLIMITED)
time correction flag
(NOT_SET)
NOT_SET Shot time flag; Indicates what shot time is used.

flag values flag_meanings
0, 1 transmit_time ground_bounce_time
Rel 34 GLAS Binary Data DS_UTCTime_1
gps_time_flg INTEGER_1
(UNLIMITED)
time correction flag
(NOT_SET)
NOT_SET GPS time flag; Indicates if delta gps time correction is applied to shot time

flag values flag_meanings
0, 1 not_applied applied
Rel 34 GLAS Binary Data DS_UTCTime_1
pl_timing_flg INTEGER_1
(UNLIMITED)
time correction flag
(NOT_SET)
NOT_SET Post-launch timing; indicates if post-launch timing bias is applied. Data value is stored in the Metadata group.

flag values flag_meanings
0, 1 not_applied applied
Rel 34 GLAS Binary Data DS_UTCTime_1
ddelay_flg INTEGER_1
(UNLIMITED)
time correction flag
(NOT_SET)
NOT_SET Digitizer 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 values flag_meanings
0, 1 applied not_applied
Rel 34 GLAS Binary Data DS_UTCTime_1
peaktp_flg INTEGER_1
(UNLIMITED)
time correction flag
(NOT_SET)
NOT_SET Peak of transmit pulse flag; Indicates if time to peak of transmit pulse is accounted for in shot time

flag values flag_meanings
0, 1 applied not_applied
Rel 34 GLAS Binary Data DS_UTCTime_1

Group: Data_1HZ/Geolocation

This group contains geolocation-related parameters.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
d_lat DOUBLE
(UNLIMITED)
Spot 1 Coordinate Data, Latitude Corrected
(latitude)
degrees_north The geodetic latitude of the first laser spot in this record, computed from the precision orbit, precision attitude, and preliminary range. The preliminary range is used with no geodetic corrections applied. The values are in degrees North. Rel 34 GLAS Binary Data DS_UTCTime_1
d_lon DOUBLE
(UNLIMITED)
Spot 1 Coordinate Data, Longitude Corrected
(longitude)
degrees_east The geodetic longitude of the first laser spot in this record, computed from the precision orbit, precision attitude, and preliminary range. The preliminary range is used with no geodetic corrections applied. The values are in east longitude. Rel 34 GLAS Binary Data DS_UTCTime_1

Group: Data_1HZ/Packet_data

This group contains packet-availability information.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
apid_ADLg_1_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Altimeter Digitizer large wf packet APID availability flag for 1st 10 shots

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_ADLg_2_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Altimeter Digitizer large wf packet APID availability flag for 2nd 10 shots

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_ADLg_3_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Altimeter Digitizer large wf packet APID availability flag for 3rd 10 shots

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_ADLg_4_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Altimeter Digitizer large wf packet APID availability flag for 4th 10 shots

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_ADSm_1_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Altimeter Digitizer small wf packet APID availability flag for 1st 10 shots

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_ADSm_2_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Altimeter Digitizer small wf packet APID availability flag for 2nd 10 shots

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_ADSm_3_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Altimeter Digitizer small wf packet APID availability flag for 3rd 10 shots

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_ADSm_4_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Altimeter Digitizer small wf packet APID availability flag for 4th 10 shots

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_PC532_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET 532 Photon counter packet APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_CD1064_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET 1064 Cloud Digitizer packet APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_ADSci_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Ancillary science packet APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_ASAD_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Altimeter Digitizer telemetry data in Ancillary science packet APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_ASPC_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Photon counter telemetry data in Ancillary science packet APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_ASCF_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Cloud Digitizer telemetry data in Ancillary science packet APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_ASCT_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET C&T board telem. data in Ancillary science packet APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_CT20_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET CT HW telemetry packet #1 (APID 20) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_CT21_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET CT HW telemetry packet #2 (APID 21) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_CT22_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET CT HW telemetry packet #3 (APID 22) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_CT23_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET CT HW telemetry packet #4 (APID 23) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_CT50_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET CT HW telemetry packet #5 (APID 50) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_SS24_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Small software telemetry packet #1 (APID 24) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_LS25_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Large software telemetry packet #1 (APID 25) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_LS55_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Large software telemetry packet #2 (APID 55) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_GPS_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET GPS telemetry packet APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_PRAP_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET S/C position, rate, and attitude telemetry packet (PRAP) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_LPA_1_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET LPA packet #1 APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_LPA_2_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET LPA packet #2 APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_LPA_3_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET LPA packet #3 APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1
apid_LPA_4_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET LPA packet #4 APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 34 GLAS Binary Data DS_UTCTime_1

Group: Data_1HZ/Transmit_Energy

This group contains information relating to transmit energy.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
i_gval_tx INTEGER
(UNLIMITED)
Gain Value used for Transmitted Pulse - uncalibrated
(NOT_SET)
counts Gain value used for transmitted pulse - uncalibrated Rel 34 GLAS Binary Data DS_UTCTime_1
d_beam_azimuth DOUBLE
(UNLIMITED)
Azimuth
(NOT_SET)
degrees Co-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 Data DS_UTCTime_1
d_beam_coelev DOUBLE
(UNLIMITED)
Co-elevation
(NOT_SET)
degrees The direction, eastwards from north, of the laser beam vector as seen by an observer at the laser ground spot viewing toward the spacecraft (i.e., the vector from the ground to the spacecraft). When the spacecraft is precisely at the geodetic zenith, the value will be 99999 degrees. Rel 34 GLAS Binary Data DS_UTCTime_1
i_N_val INTEGER
(UNLIMITED)
Value of N
(NOT_SET)
gates Value of N used for waveform compression for the frame. From APID19, Offset 236. The decompress time array is available on GLAH01. Rel 34 GLAS Binary Data DS_UTCTime_1
i_r_val INTEGER
(UNLIMITED)
Value of r
(NOT_SET)
NOT_SET Value of r used for waveform compression for frame. From APID19, Offset 238. Not valid if APID19 is missing. The decompress time array is available on GLAH01. Rel 34 GLAS Binary Data DS_UTCTime_1
i_compRatio_p INTEGER
(UNLIMITED)
Compression Ratios
(NOT_SET)
NOT_SET Averaging value p for frame. From APID19, Offset 232. First N downlink samples are generated by averaging p raw digitized elements and the rest of the allocated samples in the waveform by averaging q elements (see i_compRatio_q). The decompress time array is available on GLAH01. Rel 34 GLAS Binary Data DS_UTCTime_1
i_compRatio_q INTEGER
(UNLIMITED)
Compression Ratios
(NOT_SET)
NOT_SET Averaging value q for frame. From APID19, Offset 232. First N downlink samples are generated by averaging p raw digitized elements and the rest of the allocated samples in the waveform by averaging q elements. The decompress time array is available on GLAH01. Rel 34 GLAS Binary Data DS_UTCTime_1

Group: Data_1HZ/Quality

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

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
orbit_pred_flg INTEGER_1
(UNLIMITED)
POD flag (Orbit Flag)
(flags)
NOT_SET Orbit flag; Predicted or precision orbit flag

flag values flag_meanings
0, 1, 2 precision_orbit_used predicted_orbit_used onboard_orbit_used
Rel 34 GLAS Binary Data DS_UTCTime_1
orbit_man_flg INTEGER_1
(UNLIMITED)
Maneuver flag
(NOT_SET)
NOT_SET If maneuvers occurred, orbit is considered degraded.

flag values flag_meanings
0, 1 no_maneuvers maneuvers_occurred_during_this_record
Rel 34 GLAS Binary Data DS_UTCTime_1
orbit_model_flg INTEGER_1
(UNLIMITED)
Model problems flag.
(NOT_SET)
NOT_SET model_problems indicated when orbit RMS > 5 cm; indicates required accuracy not met

flag values flag_meanings
0, 1 no_model_problems model_problems
Rel 34 GLAS Binary Data DS_UTCTime_1
orbit_att_flg INTEGER_1
(UNLIMITED)
Attitude flag
(NOT_SET)
NOT_SET modeled_attitude_used indicates possible orbit degradation

flag values flag_meanings
0, 1 instrument_attitude_used_for_orbit modeled_attitude_used
Rel 34 GLAS Binary Data DS_UTCTime_1
orbit_array_flg INTEGER_1
(UNLIMITED)
Solar Array Orientation flag
(NOT_SET)
NOT_SET modeled_solar_ray_orientation indicates possible orbit degradation

flag values flag_meanings
0, 1 solar_ray_orientation_used_from measurement modeled_solar_ray_orientation
Rel 34 GLAS Binary Data DS_UTCTime_1
orbit_gps_flg INTEGER_1
(UNLIMITED)
GPS Flag
(NOT_SET)
NOT_SET GPS_data_missing indicates GPS data missing from portion of this record and possible degradation

flag values flag_meanings
0, 1 no_GPS_data_outage GPS_data_missing
Rel 34 GLAS Binary Data DS_UTCTime_1
rng_ldtide_flg INTEGER_1
(UNLIMITED)
Range Correction Flag
(NOT_SET)
NOT_SET Load tides flag; Indicates if a correction for the dynamic effect of load tides has been applied to the range before the elevation was calculated

flag values flag_meanings
0, 1 applied not_applied
Rel 34 GLAS Binary Data DS_UTCTime_1
rng_octide_flg INTEGER_1
(UNLIMITED)
Range Correction Flag
(NOT_SET)
NOT_SET Ocean tides flag; Indicates if a correction for the dynamic effect of ocean tides has been applied to the range before the elevation was calculated

flag values flag_meanings
0, 1 applied not_applied
Rel 34 GLAS Binary Data DS_UTCTime_1
rng_setide_flag INTEGER_1
(UNLIMITED)
Range Correction Flag
(NOT_SET)
NOT_SET Solid earth tides flag; Indicates if a correction for the dynamic effect of solid earth tides has been applied to the range before the elevation was calculated.

flag values flag_meanings
0, 1 applied not_applied
Rel 34 GLAS Binary Data DS_UTCTime_1
rng_drytrop_flg INTEGER_1
(UNLIMITED)
Range Correction Flag
(NOT_SET)
NOT_SET Dry troposphere flag; Indicates if a correction for propagation errors due to the dry troposphere was applied to the range before the elevation was calculated.

flag values flag_meanings
0, 1 applied not_applied
Rel 34 GLAS Binary Data DS_UTCTime_1
rng_wettrop_flg INTEGER_1
(UNLIMITED)
Range Correction Flag
(NOT_SET)
NOT_SET Wet troposphere flag Indicates if a correction for propagation errors due to the wet troposphere was applied to the range before the elevation was calculated.

flag values flag_meanings
0, 1 applied not_applied
Rel 34 GLAS Binary Data DS_UTCTime_1
rng_intbias_flg INTEGER_1
(UNLIMITED)
Range Correction Flag
(NOT_SET)
NOT_SET Internal range bias flag; Indicates if 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 values flag_meanings
0, 1 applied not_applied
Rel 34 GLAS Binary Data DS_UTCTime_1
rng_plbias_flg INTEGER_1
(UNLIMITED)
Range Correction Flag
(NOT_SET)
NOT_SET Post-launch range bias flag; Indicates if 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 values flag_meanings
0, 1 applied not_applied
Rel 34 GLAS Binary Data DS_UTCTime_1
att_offnadir_flg INTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SET Off-nadir angle flag; Indicates if off-nadir angle is within limits

flag values flag_meanings
0, 1 within_limit outside_limits
Rel 34 GLAS Binary Data DS_UTCTime_1
att_oceansw_flg INTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SET Ocean sweep flag; Indicates if an ocean sweep is within the time frame of this record

flag values flag_meanings
0, 1 not_ocean_sweep ocean_sweep
Rel 34 GLAS Binary Data DS_UTCTime_1
att_pointing_flg INTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SET Target of opportunity off-pointing flag; Indicates if this record is within time of target of opportunity off-pointing

flag values flag_meanings
0, 1 not_pointing pointing
Rel 34 GLAS Binary Data DS_UTCTime_1
att_steering_flg INTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SET Steering to reference track flag; Indicates if this record is within target of opportunity off-pointing

flag values flag_meanings
0, 1 not_pointing pointing
Rel 34 GLAS Binary Data DS_UTCTime_1
att_actual_flg INTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SET Actual data bits flag; Indicates if the first 3 Attitide Flags have been set based on actual data, if ignore, then IGNORE those bits.

flag values flag_meanings
0, 1 actual ignore
Rel 34 GLAS Binary Data DS_UTCTime_1
att_ist_flg INTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SET IST 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 values flag_meanings
0, 1, 2, 3 good missing noisy missing_noisy
Rel 34 GLAS Binary Data DS_UTCTime_1
att_gyro_flg INTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SET GYRO 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 values flag_meanings
0, 1, 2, 3 good missing noisy missing_noisy
Rel 34 GLAS Binary Data DS_UTCTime_1
att_lrs_flg INTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SET LRS 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 values flag_meanings
0, 1, 2, 3, 4, 5, 6, 7 good no_star no_laser no_crs only_crs only_laser only_star missing_lrs
Rel 34 GLAS Binary Data DS_UTCTime_1
altfrm_corr_flg INTEGER_1
(UNLIMITED)
Altimeter Frame Quality Flag
(NOT_SET)
NOT_SET Corrections 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 values flag_meanings
0, 1 good uncorrected
Rel 34 GLAS Binary Data DS_UTCTime_1
altfrm_data_flg INTEGER_1
(UNLIMITED)
Altimeter Frame Quality Flag
(NOT_SET)
NOT_SET Frame 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 values flag_meanings
0, 1 good not_good
Rel 34 GLAS Binary Data DS_UTCTime_1
altfrm_meas_flg INTEGER_1
(UNLIMITED)
Altimeter Frame Quality Flag
(NOT_SET)
NOT_SET Measurements flag; Indicates if all GLAS measurements are good or if there is at least one unusable measurement in the frame

flag values flag_meanings
0, 1 good not_good
Rel 34 GLAS Binary Data DS_UTCTime_1
altfrm_use_flg INTEGER_1
(UNLIMITED)
Altimeter Frame Quality Flag
(NOT_SET)
NOT_SET Usable Measurements flag; Indicates if there is at least one usable measurement in the frame; or if all GLAS measurements are bad

flag values flag_meanings
0, 1 usable not_usable
Rel 34 GLAS Binary Data DS_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

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
DS_UTCTime_40 DOUBLE
(UNLIMITED)
Transmit time of each shot in J2000 seconds
(time)
seconds since 2000-01-01 12:00:00 UTC The 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 Data NOT_SET
DS_PeakNumber INTEGER
(UNLIMITED)
Peak index number
(NOT_SET)
NOT_SET This array indicates the index of the detected waveform peak for several parameters. PeakNumber=1 indicates the detected peak closest to the ground; PeakNumber=6 indicates the peak furthest from the ground. Constants NOT_SET

Group: Data_40HZ/Time

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

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
i_rec_ndx INTEGER
(UNLIMITED)
GLAS Record Index
(NOT_SET)
NOT_SET Unique index that relates this record to the corresponding record(s) in each GLAS data product. Rel 34 GLAS Binary Data DS_UTCTime_40
i_shot_count INTEGER
(UNLIMITED)
GLAS shot counter
(NOT_SET)
NOT_SET Identifies 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 Data DS_UTCTime_40

Group: Data_40HZ/Geolocation

This group contains geolocation-related parameters.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
d_lat DOUBLE
(UNLIMITED)
Spot Coordinate Data - Latitude (Uncorrected)
(latitude)
degrees_north The geodetic latitude of the forty laser spots in this record, computed from the precision orbit, precision attitude, and preliminary range. The preliminary range is used with no geodetic corrections applied. The values are in degrees North. Rel 34 GLAS Binary Data DS_UTCTime_40
d_lon DOUBLE
(UNLIMITED)
Spot Coordinate Data - Longitude (Uncorrected)
(longitude)
degrees_east The geodetic longitude of the forty laser spots in this record, computed from the precision orbit, precision attitude, and preliminary range. The preliminary range is used with no geodetic corrections applied. The values are in east longitude. Rel 34 GLAS Binary Data DS_UTCTime_40

Group: Data_40HZ/Elevations

This group contains surface-related parameters.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
d_refRngNs DOUBLE
(UNLIMITED)
Reference Range
(altimeter_range)
ns Two-way reference range in time measured from the centroid of the transmit pulse to the last received echo digitizer gate telemetered (farthest from the spacecraft). Rel 34 GLAS Binary Data DS_UTCTime_40
d_elev DOUBLE
(UNLIMITED)
Spot Surface Elevation with respect to ITRF ellipsoid (Uncorrected)
(NOT_SET)
meters The surface elevation with respect to ellipsoid of the forty laser spots in this record. The elevation is calculated using the preliminary range corrected to be from the Gaussian fit to the transmit, the precision orbit, and precision attitude with no geodetic corrections applied. Rel 34 GLAS Binary Data DS_UTCTime_40
d_centroidInstr DOUBLE
(UNLIMITED)
Centroid retracker offset using max peak
(NOT_SET)
ns Offset to be added to d_refRng to give the two-way range in time 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 Data DS_UTCTime_40
d_GmCns DOUBLE (UNLIMITED) Transmit pulse Gaussian peak location to centroid in ns ns The difference in nanoseconds 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 Data DS_UTCTime_40

Group: Data_40HZ/Elevation_Flags

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

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
wfq1_maxiter_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Alternate parameters; 1 = maximum iteration exceeded for alternate parameters

flag values flag_meanings
0, 1 not_exceeded exceeded
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq2_maxiter_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Standard parameters; 1 = maximum iteration exceeded for standard parameters

flag values flag_meanings
0, 1 not_exceeded exceeded
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq1_ledge_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Leading edge for alternate; 1 = no leading edge detected for alternate parameters

flag values flag_meanings
0, 1 detected not_detected
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq1_tedge_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Trailing edge for alternate; 1 = no trailing edge detected for alternate parameters

flag values flag_meanings
0, 1 detected not_detected
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq2_ledge_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Leading edge for standard; 0 = leading edge detected for standard parameters

flag values flag_meanings
0, 1 detected not_detected
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq2_tedge_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Trailing edge for standard; 0 = trailing edge detected for standard parameters

flag values flag_meanings
0, 1 detected not_detected
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq_ld_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Land surface; 1 = possible land surface as indicated by regional ID grid

flag values flag_meanings
0, 1 not_land possible_land
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq_oc_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Ocean surface; 1 = possible ocean surface as indicated by regional ID grid

flag values flag_meanings
0, 1 not_ocean possible_ocean
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq_is_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Icesheet surface; 1 = possible icesheet surface as indicated by regional ID grid

flag values flag_meanings
0, 1 not_icesheet possible_icesheet
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq_si_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Sea ice surface; 1 = possible sea ice surface as indicated by regional ID grid

flag values flag_meanings
0, 1 not_seaice possible_seaice
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq_missing_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Invalid WF; 1 = invalid WF (filled/missing data)

flag values flag_meanings
0, 1 valid not_valid
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq_nopulse_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET 1 = no transmitted pulse

flag values flag_meanings
0, 1 pulse no_pulse
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq1_nofit_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Fit for alternate parameters; 1 = no fit for alternate parameters. Also set if no signal or invalid.

flag values flag_meanings
0, 1 fit no_fit
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq2_nofit_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Fit for standard parameters; 1 = no fit for standard parameters. Also set if no signal or invalid.

flag values flag_meanings
0, 1 fit no_fit
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq1_noise_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Alternate parameter noise; 0 = background noise and standard deviation of noise were calculated for alternate parameters

flag values flag_meanings
0, 1 calculated not_calculated
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq2_noise_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Standard parameter noise; 0 = background noise and standard deviation of noise were calculated for standard parameters

flag values flag_meanings
0, 1 calculated not_calculated
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq1_sig_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Signal for alternate; No signal detected for alternate parameters for shot (Set if a waveform was present. i.e.: not fill data--but no leading or trailing edge detected)

flag values flag_meanings
0, 1 detected not_detected
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq2_sig_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Signal for standard signal detected for standard parameters for shot (Set if a waveform was present. i.e.: not fill data--but no leading or trailing edge detected)

flag values flag_meanings
0, 1 detected not_detected
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq1_region_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET WF Fit Alternate; 0=WF fit using all gates; 1=WF fit using selected region from signal begin minus I_OFFSETB1 to signal end plus I_OFFSETE1 for alternate parameters for shot 40 (the offsets are in anc07_0004)

flag values flag_meanings
0, 1 all_gates region
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq2_region_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET WF Fit Standard; 0=WF fit using all gates; 1=WF fit using selected region from signal begin minus I_OFFSETB2 to signal end plus I_OFFSETE2 for standard parameters for shot 40 (the offsets are in anc07_0004)

flag values flag_meanings
0, 1 all_gates region
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq1_sd_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Fit standard deviation alternate; 1 = standard deviation of fit (alternate parameters) is too large

flag values flag_meanings
0, 1 valid not_valid
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq2_sd_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Fit standard deviation standard; 1 = standard deviation of fit standard parameters) is too large

flag values flag_meanings
0, 1 valid not_valid
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq1_fit2_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Fit alternate; 1 = a second fit was tried for alternate parameters.

flag values flag_meanings
0, 1 not_tried tried
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq2_fit2_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Fit standard; 1 = a second fit was tried for standard parameters.

flag values flag_meanings
0, 1 not_tried tried
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq_thres_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET First gate threshold; 1 = the shot has no signal because the first gate is above threshold.

flag values flag_meanings
0, 1 in_bounds out_of_bounds
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq_suspect_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Suspect fit; 1 = fit is suspect (narrow pulse or low signal to noise ratio).

flag values flag_meanings
0, 1 not_suspect suspect
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq1_parm_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Alternate parameterization; 1 = alternate parameterization was used.

flag values flag_meanings
0, 1 not_used used
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq2_parm_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Standard parameterization; 1 = standard parameterization was used.

flag values flag_meanings
0, 1 not_used used
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq_pqn_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Compression; 0 = pqn type compression used, 1 = r type compression used

flag values flag_meanings
0, 1 pqn rtype
Rel 34 GLAS Binary Data DS_UTCTime_40
wfq_amp_flg INTEGER_1
(UNLIMITED)
Received Echo Quality Flag
(NOT_SET)
NOT_SET Raw amplitude; 1 = number of gates with raw amplitude of 255 is greater than i_min4clip (a variable in anc07_0004)

flag values flag_meanings
0, 1 not_clipped clipped
Rel 34 GLAS Binary Data DS_UTCTime_40
elv_cnt_1_flg INTEGER_1
(UNLIMITED)
Elevation Definition Flag
(NOT_SET)
NOT_SET Standard parameterization; 1=centroid of received pulse between signal begin and signal end defined for standard parameterization used to calculate elevation.

flag values flag_meanings
0, 1 not_used used
Rel 34 GLAS Binary Data DS_UTCTime_40
elv_cnt_2_flg INTEGER_1
(UNLIMITED)
Elevation Definition Flag
(NOT_SET)
NOT_SET Alternate parameterization; 1=centroid of received pulse between signal begin and signal end defined for alternate parameterization used to calculate elevation.

flag values flag_meanings
0, 1 not_used used
Rel 34 GLAS Binary Data DS_UTCTime_40
elv_peak_1_flg INTEGER_1
(UNLIMITED)
Elevation Definition Flag
(NOT_SET)
NOT_SET Standard parameterization; 1=location of last Gaussian peak in received pulse for standard parameterization used to calculate elevation.

flag values flag_meanings
0, 1 not_used used
Rel 34 GLAS Binary Data DS_UTCTime_40
elv_peak_2_flg INTEGER_1
(UNLIMITED)
Elevation Definition Flag
(NOT_SET)
NOT_SET Alternate parameterization; 1=location of last Gaussian peak in received pulse for alternate parameterization used to calculate elevation.

flag values flag_meanings
0, 1 not_used used
Rel 34 GLAS Binary Data DS_UTCTime_40
elv_thres_flg INTEGER_1
(UNLIMITED)
Elevation Definition Flag
(NOT_SET)
NOT_SET Threshold retracker; 1=Location of threshold retracker used to calculate elevation.

flag values flag_meanings
0, 1 not_used used
Rel 34 GLAS Binary Data DS_UTCTime_40
elv_gauss_flg INTEGER_1
(UNLIMITED)
Elevation Definition Flag
(NOT_SET)
NOT_SET Gaussion; 1=location associated with Gaussian with largest peak used to calculate elevation.

flag values flag_meanings
0, 1 not_used used
Rel 34 GLAS Binary Data DS_UTCTime_40
elv_other_flg INTEGER_1
(UNLIMITED)
Elevation Definition Flag
(NOT_SET)
NOT_SET Other algorithm; 1=other algorithm used to calculate elevation - see software release documentation for details.

flag values flag_meanings
0, 1 not_used used
Rel 34 GLAS Binary Data DS_UTCTime_40
elv_cloud_flg INTEGER_1
(UNLIMITED)
Elevation Definition Flag
(NOT_SET)
NOT_SET Cloud contamination; 1 = Gain > flag value, indicating probable cloud contamination.

flag values flag_meanings
0, 1 no_cloud cloud
Rel 34 GLAS Binary Data DS_UTCTime_40
elev_use_flg INTEGER_1
(UNLIMITED)
Elevation use flag
(NOT_SET)
NOT_SET Flag indicating whether the elevations on this record should be used (0=elevation is valid; 1=elevation is invalid).

flag values flag_meanings
0, 1 valid not_valid
Rel 34 GLAS Binary Data DS_UTCTime_40
att_pad_use_flg INTEGER_1
(UNLIMITED)
Pad Use Flag
(NOT_SET)
NOT_SET PAD Use Flag: 1 = PAD used to determine spot location.

flag values flag_meanings
0, 1 used not_used
Rel 34 GLAS Binary Data DS_UTCTime_40
att_calc_pad_flg INTEGER_1
(UNLIMITED)
Calc Pad Use Flag
(NOT_SET)
NOT_SET Calc PAD Use Flag; 0 = new PAD, 1 = pass-thru PAD was used to determine orbit.

flag values flag_meanings
0, 1 new pass_thru
Rel 34 GLAS Binary Data DS_UTCTime_40
att_lpa_flg INTEGER_1
(UNLIMITED)
LPA Problem Flag
(NOT_SET)
NOT_SET LPA Problem Flag; Indicates LPA quality : 0=good, 1=missing or 2=noisy.

flag values flag_meanings
0, 1, 2 good missing noisy
Rel 34 GLAS Binary Data DS_UTCTime_40
sigma_att_flg INTEGER_1
(UNLIMITED)
Attitude Quality Indicator
(NOT_SET)
NOT_SET Attitude quality indicator flag.

flag values flag_meanings
0, 50, 100, 127 good warning bad not_valid
Rel 34 GLAS Binary Data DS_UTCTime_40
i_satNdx INTEGER
(UNLIMITED)
Saturation Index
(NOT_SET)
ns The 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 Data DS_UTCTime_40

Group: Data_40HZ/Transmit_Energy

This group contains the 40HZ transmit energy parameters.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
d_maxTrAmp DOUBLE
(UNLIMITED)
Maximum Amp of Transmitted Pulse
(NOT_SET)
volts Maximum amplitude of transmitted pulse calculated from all (48) gates telemetered. Rel 34 GLAS Binary Data DS_UTCTime_40
d_sDevFitTr DOUBLE
(UNLIMITED)
Standard deviation of fit of transmitted pulse
(NOT_SET)
volts Standard deviation of fit of a gaussian model to the transmitted pulse. Rel 34 GLAS Binary Data DS_UTCTime_40
d_tpazimuth DOUBLE
(UNLIMITED)
Transmit pulse azimuth
(NOT_SET)
deg Transmit pulse azimuth. Angle eastwards from north of the major axis of the transmit pulse, as seen by the LPA. From ANC09. Rel 34 GLAS Binary Data DS_UTCTime_40
d_tpeccentricity DOUBLE
(UNLIMITED)
Transmit pulse eccentricity
(NOT_SET)
e Transmit pulse eccentricity as measured by the LPA. From ANC09. Rel 34 GLAS Binary Data DS_UTCTime_40
d_tpmajoraxis DOUBLE
(UNLIMITED)
Transmit pulse major axis
(NOT_SET)
m Transmit pulse major axis as measured by the LPA. From ANC09. Rel 34 GLAS Binary Data DS_UTCTime_40
d_tpintensity DOUBLE
(UNLIMITED)
Transmit pulse intensity
(NOT_SET)
counts Transmit pulse intensity as measured by the LPA. >From ANC09. Rel 34 GLAS Binary Data DS_UTCTime_40
d_noiseTr DOUBLE
(UNLIMITED)
Noise estimate from the Gaussian fit to the transmitted pulse.
(NOT_SET)
Volts noise parameter from the gaussian fit to the transmitted pulse. Rel 34 GLAS Binary Data DS_UTCTime_40
d_ampTr DOUBLE
(UNLIMITED)
Amplitude estimate of the gaussian fit to the transmitted pulse.
(NOT_SET)
Volts amplitude parameter from the gaussian fit to the transmitted pulse Rel 34 GLAS Binary Data DS_UTCTime_40
d_pklocTr DOUBLE
(UNLIMITED)
Peak location of the gaussian fit to the transmitted pulse.
(NOT_SET)
ns peak location (ns) Parameter from the Gaussian fit to the transmitted pulse. Peak location is relative to gate 1 of the transmit pulse. Rel 34 GLAS Binary Data DS_UTCTime_40
d_sigmaTr DOUBLE
(UNLIMITED)
Sigma of the Gaussian fit to the Transmitted Pulse
(NOT_SET)
ns sigma from the gaussian fit to the transmitted pulse. Rel 34 GLAS Binary Data DS_UTCTime_40
d_skewTr DOUBLE
(UNLIMITED)
Skewness of Transmitted Pulse
(NOT_SET)
NOT_SET Skewness of transmitted pulse. Rel 34 GLAS Binary Data DS_UTCTime_40
d_locTr DOUBLE
(UNLIMITED)
Centroid of transmitted pulse in time relative to gate 1 of transmit waveform.
(NOT_SET)
ns The time from gate 1 of the transmitted pulse to the centroid of transmitted pulse calculated from the 48 gates telemetered. Rel 34 GLAS Binary Data DS_UTCTime_40
d_tpCentX DOUBLE
(UNLIMITED)
LPA Centroid X
(NOT_SET)
arcsec X position of the centroid of the transmit pulse in the LPA, in arcsec from the left edge of the LPA (outer edge of pixel column 0). From ANC09. Rel 34 GLAS Binary Data DS_UTCTime_40
d_tpCentY DOUBLE
(UNLIMITED)
LPA Centroid Y
(NOT_SET)
arcsec Y position of the centroid of the transmit pulse in the LPA, in arcsec from the upper edge of the LPA (outer edge of pixel row 0). From ANC09. Rel 34 GLAS Binary Data DS_UTCTime_40
d_tpOrX DOUBLE
(UNLIMITED)
Pulse Orientation
(NOT_SET)
degrees Pulse Orientation (Angle measured counter-clockwise from LPA X-axis). Rel 34 GLAS Binary Data DS_UTCTime_40
d_TxNrg DOUBLE
(UNLIMITED)
1064 nm Laser Transmit Energy
(NOT_SET)
joules The 1064 nm laser pulse transmitted energy in energy units, computed from the digitized outgoing pulse and the transmit gain. Rel 34 GLAS Binary Data DS_UTCTime_40

Group: Data_40HZ/Reflectivity

This group contains the 40HZ Reflectivity parameters.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
d_reflctuncmxpk DOUBLE
(UNLIMITED)
Reflectivity Not Corrected For Atmospheric Effects from max peak
(NOT_SET)
NOT_SET Reflectivity, not corrected for atmospheric effects from max peak, is calculated as Refl = R/T, where R is the received energy from the maximum amplitude peak of the waveform after it has been scaled for range, and T is the transmitted energy. i_reflctuncmxpk 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 = i_reflctuncmxpk * (i_RecNrgAll + i_satNrgCorr)/i_RecNrgAll)

The atmospheric corrected reflectivity may be calculated from this uncorrected reflectivity by multiplying it by d_reflCor_atm.
Rel 34 GLAS Binary Data DS_UTCTime_40
d_reflctUncorr DOUBLE
(UNLIMITED)
Reflectivity not corrected for Atmospheric Effects
(NOT_SET)
NOT_SET Reflectivity, 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_reflctUncorr 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 = i_reflctUncorr * (i_RecNrgAll + i_satNrgCorr)/i_RecNrgAll)

The atmospheric corrected reflectivity may be calculated from this uncorrected reflectivity by multiplying it by d_reflCor_atm.
Rel 34 GLAS Binary Data DS_UTCTime_40
i_gval_rcv INTEGER
(UNLIMITED)
Gain value used for received pulse
(NOT_SET)
counts Gain value used for received pulse - uncalibrated. Rel 34 GLAS Binary Data DS_UTCTime_40
d_sDevNsOb1 DOUBLE
(UNLIMITED)
Standard deviation of 1064 nm Background noise, (alternate)
(NOT_SET)
volts The standard deviation of the background noise (alternate parameters). Rel 34 GLAS Binary Data DS_UTCTime_40
d_sDevNsOb2 DOUBLE
(UNLIMITED)
Standard deviation of 1064 nm Background noise, (standard)
(NOT_SET)
volts The standard deviation of the background noise (standard parameters). Rel 34 GLAS Binary Data DS_UTCTime_40

Group: Data_40HZ/Waveform

This group contains the 40HZ Waveform parameters.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
d_maxRecAmp DOUBLE
(UNLIMITED)
Max Amplitude of Received Echo
(NOT_SET)
volts Maximum amplitude of the received echo. Rel 34 GLAS Binary Data DS_UTCTime_40
d_maxSmAmp DOUBLE
(UNLIMITED)
Peak Amplitude of Smoothed Received Echo
(NOT_SET)
volts The peak amplitude of the received echo after it has been smoothed to remove high frequency noise (see ATBD). Rel 34 GLAS Binary Data DS_UTCTime_40
d_RecNrgAll DOUBLE
(UNLIMITED)
Received Energy signal begin to signal end
(NOT_SET)
Joules This 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 Data DS_UTCTime_40
d_RMSpulseWd DOUBLE
(UNLIMITED)
RMS Pulse Width
(NOT_SET)
ns The RMS width of the entire received waveform. See Eq 5 of ATBD for derivation of range. Rel 34 GLAS Binary Data DS_UTCTime_40
d_areaRecWF1 DOUBLE
(UNLIMITED)
Area under received echo (alternate)
(NOT_SET)
volts * ns Area under the received echo from signal begin to signal end using alternate parameters. Rel 34 GLAS Binary Data DS_UTCTime_40
d_skew1 DOUBLE
(UNLIMITED)
Skewness of Received Echo (alternate)
(NOT_SET)
NOT_SET Skewness of the received echo from signal begin to signal end using alternate parameters. Rel 34 GLAS Binary Data DS_UTCTime_40
d_kurt1 DOUBLE
(UNLIMITED)
Kurtosis of Received Echo (alternate)
(NOT_SET)
NOT_SET Kurtosis of the received echo from signal begin to signal end using alternate parameters. Rel 34 GLAS Binary Data DS_UTCTime_40
i_nPeaks1 INTEGER
(UNLIMITED)
Initial Number of Peaks in received echo (alternate)
(NOT_SET)
NOT_SET The initial number of peaks of the received echo; determined from the smoothed waveform, using alternate parameters Rel 34 GLAS Binary Data DS_UTCTime_40
d_wfFitSDev_1 DOUBLE
(UNLIMITED)
The received echo fit standard deviation (alternate)
(NOT_SET)
NOT_SET The standard deviation of the difference between the functional fit and the received echo using alternate parameters. Rel 34 GLAS Binary Data DS_UTCTime_40
d_wfnoiseOb1 DOUBLE
(UNLIMITED)
1064 nm Background noise, (alternate)
(NOT_SET)
volts Either the background noise mean value measured by the instrument, or the background noise calculated from the received echo using alternate parameters. See flag definition for l_WFqual - a flag is set if the background noise is calculated. Rel 34 GLAS Binary Data DS_UTCTime_40
i_numIters1 INTEGER
(UNLIMITED)
Number of iterations performed during fit (alternate)
(NOT_SET)
NOT_SET This parameters contains the number of iterations for both the standard fit (shot,2), and the alternate fit (shot,1). These numbers are packed into forty bytes on the product: i_numIters(1) contains: bits 0-3: number of iterations for alternate fit for shot 1, bits 4-7: number of iterations for standard fit for shot 1 i_numIters(2) contains: bits 0-3: number of iterations for alternate fit for shot 2, bits 4-7: number of iterations for standard fit for shot 2 ... i_numIters(40) contains: bits 0-3: number of iterations for alternate fit for shot 40, bits 4-7: number of iterations for standard fit for shot 40 Rel 34 GLAS Binary Data DS_UTCTime_40
d_areaRecWF2 DOUBLE
(UNLIMITED)
Area under received echo (standard)
(NOT_SET)
volts * ns Area under the received echo from signal begin to signal end using standard parameters. Rel 34 GLAS Binary Data DS_UTCTime_40
d_skew2 DOUBLE
(UNLIMITED)
Skewness
(NOT_SET)
NOT_SET The skewness of the received echo from signal begin to signal end using standard parameters. Rel 34 GLAS Binary Data DS_UTCTime_40
d_kurt2 DOUBLE
(UNLIMITED)
Kurtosis of the Received Echo (standard)
(NOT_SET)
NOT_SET Kurtosis of the received echo from signal begin to signal end using standard parameters. Rel 34 GLAS Binary Data DS_UTCTime_40
i_nPeaks2 INTEGER
(UNLIMITED)
Initial Number of Peaks in received echo (standard)
(NOT_SET)
NOT_SET The initial number of peaks found in the received echo; determined from the smoothed waveform, using standard parameters. Rel 34 GLAS Binary Data DS_UTCTime_40
d_wfFitSDev_2 DOUBLE
(UNLIMITED)
The received echo fit standard deviation (standard)
(NOT_SET)
volts The standard deviation of the difference between the functional fit and the received echo using the standard parameters. Rel 34 GLAS Binary Data DS_UTCTime_40
d_wfnoiseOb2 DOUBLE
(UNLIMITED)
1064 nm Background noise, (standard)
(NOT_SET)
volts Either the background noise mean value measured by the instrument, or the background noise calculated from the received echo using standard parameters. See flag definition for l_WFqual - a flag is set if the background noise is calculated. Rel 34 GLAS Binary Data DS_UTCTime_40
i_numIters2 INTEGER
(UNLIMITED)
Number of iterations performed during fit (standard)
(NOT_SET)
NOT_SET This parameter contains the number of iterations for both the standard fit (shot,2), and the alternate fit (shot,1). These numbers are packed into forty bytes on the product: i_numIters(1) contains: bits 0-3: number of iterations for alternate fit for shot 1, bits 4-7: number of iterations for standard fit for shot 1 i_numIters(2) contains: bits 0-3: number of iterations for alternate fit for shot 2, bits 4-7: number of iterations for standard fit for shot 2 ... i_numIters(40) contains: bits 0-3: number of iterations for alternate fit for shot 40, bits 4-7: number of iterations for standard fit for shot 40 Rel 34 GLAS Binary Data DS_UTCTime_40
d_noise1 DOUBLE
(UNLIMITED)
Noise estimate from the Gaussian fit to the received echo (alternate)
(NOT_SET)
Volts Noise Parameter (in physical units) determined from the fit of the received echo using the alternate parameterization. Rel 34 GLAS Binary Data DS_UTCTime_40
d_amp1 DOUBLE
(UNLIMITED, 6)
Amplitude estimate of the Gaussian fit to the received echo (alternate)
(NOT_SET)
Volts Amptitude Parameter (in physical units) determined from the fit of the received echo using the alternate parameterization for up to 6 peaks. nPeaks1 indicates the number of peaks computed. The first element corresponds to the closest-to-the-ground or 1st peak. The second element corresponds to the next-to-last (2nd) peak. The last element corresponds to the closest-to-the-satellite peak. If there are fewer than six peaks, the unused parameters are set to invalid. Adding the location to d_refRng gives the two-way range in time to the center of that peak. Rel 34 GLAS Binary Data DS_UTCTime_40
d_pkloc1 DOUBLE
(UNLIMITED, 6)
Peak Location of the Gaussian fit to the received echo (alternate)
(NOT_SET)
ns Peak Location Parameter (in physical units) determined from the fit of the received echo using the alternate parameterization for up to 6 peaks. nPeaks1 indicates the number of peaks computed. The first element corresponds to the closest-to-the-ground or 1st peak. The second element corresponds to the next-to-last (2nd) peak. The last element corresponds to the closest-to-the-satellite peak. If there are fewer than six peaks, the unused parameters are set to invalid.Adding the location to d_refRng gives the two-way range in time to the center of that peak. Rel 34 GLAS Binary Data DS_UTCTime_40
d_simga1 DOUBLE
(UNLIMITED, 6)
Sigma of the Gaussian fit to the received echo (alternate)
(NOT_SET)
ns Sigma of the Gaussian Parameter (in physical units) determined from the fit of the received echo using the alternate parameterization for up to 6 peaks. nPeaks1 indicates the number of peaks computed. The first element corresponds to the closest-to-the-ground or 1st peak. The second element corresponds to the next-to-last (2nd) peak. The last element corresponds to the closest-to-the-satellite peak. If there are fewer than six peaks, the unused parameters are set to invalid. Adding the location to d_refRng gives the two-way range in time to the center of that peak. Rel 34 GLAS Binary Data DS_UTCTime_40
d_centroid1 DOUBLE
(UNLIMITED)
Centroid retracker offset (alternate)
(NOT_SET)
ns Offset to be added to d_refRng to give the two-way range in time to the location of the centroid of the received echo from signal begin through signal end defined by the alternate parameters. Rel 34 GLAS Binary Data DS_UTCTime_40
d_minRngOff1 DOUBLE
(UNLIMITED)
Minimum Range Offset (alternate)
(NOT_SET)
ns Offset to be added to d_refRng to give the two-way range in time to the location on the received echo calculated as the beginning of signal (closest to the spacecraft) using alternate parameters. Rel 34 GLAS Binary Data DS_UTCTime_40
d_preRngOff1 DOUBLE
(UNLIMITED)
Preliminary Uncorrected Range Offset (alternate)
(NOT_SET)
ns Offset to be added to d_refRng to give the two-way range in time to the location on the received echo calculated as the end of signal (farthest from the spacecraft) using alternate parameters. Rel 34 GLAS Binary Data DS_UTCTime_40
d_solnnoiseSigmas1 DOUBLE
(UNLIMITED)
Noise Sigmas of fit parameters (alternate)
(NOT_SET)
Volts Standard deviation of the noise fit parameter from the diagonal of the final covariance matrix using alternate parameterization. Rel 34 GLAS Binary Data DS_UTCTime_40
d_solnampSigmas1 DOUBLE
(UNLIMITED, 6)
Amplitude Sigmas of fit parameters (alternate)
(NOT_SET)
Volts Standard deviation of the amplitude from the diagonal of the final covariance matrix using alternate parameterization. i_nPeaks1 indicates the number of peaks computed. The first element corresponds to the closest-to-the-ground or 1st peak. The second element corresponds to the next-to-last (2nd) peak. The last element corresponds to the closest-to-the-satellite peak. If there are fewer than six peaks, the unused parameters are set to invalid. Rel 34 GLAS Binary Data DS_UTCTime_40
d_solnpklocSigmas1 DOUBLE
(UNLIMITED, 6)
Peak Location Sigmas of fit parameters (alternate)
(NOT_SET)
ns Standard deviation of the peak location from the diagonal of the final covariance matrix using alternate parameterization. i_nPeaks1 indicates the number of peaks computed. The first element corresponds to the closest-to-the-ground or 1st peak. The second element corresponds to the next-to-last (2nd) peak. The last element corresponds to the closest-to-the-satellite peak. If there are fewer than six peaks, the unused parameters are set to invalid. Rel 34 GLAS Binary Data DS_UTCTime_40
d_solnsigmaSigmas1 DOUBLE
(UNLIMITED, 6)
Gaussian sigma (width) Sigmas of fit parameters (alternate)
(NOT_SET)
ns Standard deviation of the sigma (width) parameter from the diagonal of the final covariance matrix using alternate parameterization. i_nPeaks1 indicates the number of peaks computed. The first element corresponds to the closest-to-the-ground or 1st peak. The second element corresponds to the next-to-last (2nd) peak. The last element corresponds to the closest-to-the-satellite peak. If there are fewer than six peaks, the unused parameters are set to invalid. Rel 34 GLAS Binary Data DS_UTCTime_40
d_thRtkRngOff1 DOUBLE
(UNLIMITED)
Threshold Retracker Range Offset (alternate)
(NOT_SET)
ns Offset to be added to d_refRng to give the two-way range in time to the threshold retracker location on the received echo calculated using alternate parameters. Rel 34 GLAS Binary Data DS_UTCTime_40
d_noise2 DOUBLE
(UNLIMITED)
Noise estimate from the Gaussian fit to the received echo (standard)
(NOT_SET)
Volts Noise Parameter (in physical units) determined from the fit of the received echo using the standard parameterization. Rel 34 GLAS Binary Data DS_UTCTime_40
d_amp2 DOUBLE
(UNLIMITED, 6)
Amplitude estimate of the Gaussian fit to the received echo (standard)
(NOT_SET)
Volts Amplititude Parameter (in physical units) determined from the fit of the received echo using the standard parameterization for up to 6 peaks. nPeaks2 indicates the number of peaks computed. The first element corresponds to the closest-to-the-ground or 1st peak. The second element corresponds to the next-to-last (2nd) peak. The last element corresponds to the closest-to-the-satellite peak. If there are fewer than six peaks, the unused parameters are set to invalid. Adding the location to d_refRng gives the two-way range in time to the center of that peak. Rel 34 GLAS Binary Data DS_UTCTime_40
d_pkloc2 DOUBLE
(UNLIMITED, 6)
Peak Location of the Gaussian fit to the received echo (standard)
(NOT_SET)
ns Peak Location Parameter (in physical units) determined from the fit of the received echo using the standard parameterization for up to 6 peaks. nPeaks2 indicates the number of peaks computed. The first element corresponds to the closest-to-the-ground or 1st peak. The second element corresponds to the next-to-last (2nd) peak. The last element corresponds to the closest-to-the-satellite peak. If there are fewer than six peaks, the unused parameters are set to invalid. Adding the location to d_refRng gives the two-way range in time to the center of that peak. Rel 34 GLAS Binary Data DS_UTCTime_40
d_simga2 DOUBLE
(UNLIMITED, 6)
Sigma of the Gaussian fit to the received echo (standard)
(NOT_SET)
ns Sigma of the Gaussian Parameter (in physical units) determined from the fit of the received echo using the standard parameterization for up to 6 peaks. nPeaks2 indicates the number of peaks computed. The first element corresponds to the closest-to-the-ground or 1st peak. The second element corresponds to the next-to-last (2nd) peak. The last element corresponds to the closest-to-the-satellite peak. If there are fewer than six peaks, the unused parameters are set to invalid. Adding the location to d_refRng gives the two-way range in time to the center of that peak. Rel 34 GLAS Binary Data DS_UTCTime_40
d_centroid2 DOUBLE
(UNLIMITED)
Centroid retracker offset (standard)
(NOT_SET)
ns Offset to be added to d_refRng to give the two-way range in time to the location of the centroid of the received echo from signal begin through signal end defined by the standard parameterization. Rel 34 GLAS Binary Data DS_UTCTime_40
d_minRngOff2 DOUBLE
(UNLIMITED)
Minimum Range Offset (standard)
(NOT_SET)
ns Offset to be added to d_refRng to give the two-way range in time to the location on the received echo calculated as the beginning of signal (closest to the spacecraft) closest to the spacecraft using standard parameterization. Rel 34 GLAS Binary Data DS_UTCTime_40
d_preRngOff2 DOUBLE
(UNLIMITED)
Preliminary Uncorrected Range Offset (standard)
(NOT_SET)
ns Offset to be added to d_refRng to give the two-way range in time to the location on the received echo calculated as the end of signal (farthest from the spacecraft) using standard parameterization. Rel 34 GLAS Binary Data DS_UTCTime_40
d_solnnoiseSigmas2 DOUBLE
(UNLIMITED)
Noise Sigmas of fit parameters (standard)
(NOT_SET)
Volts Standard deviation of the noise fit parameter from the diagonal of the final covariance matrix using standard parameterization. Rel 34 GLAS Binary Data DS_UTCTime_40
d_solnampSigmas2 DOUBLE
(UNLIMITED, 6)
Amplitude Sigmas of fit parameters (standard)
(NOT_SET)
Volts Standard deviation of the amplitude parameter from the diagonal of the final covariance matrix using standard parameterization. i_nPeaks2 indicates the number of peaks computed. The first element corresponds to the closest-to-the-ground or 1st peak. The second element corresponds to the next-to-last (2nd) peak. The last element corresponds to the closest-to-the-satellite peak. If there are fewer than six peaks, the unused parameters are set to invalid. Rel 34 GLAS Binary Data DS_UTCTime_40
d_solnpklocSigmas2 DOUBLE
(UNLIMITED, 6)
Peak Location Sigmas of fit parameters (standard)
(NOT_SET)
ns Standard deviation of the peak location parameter from the diagonal of the final covariance matrix using standard parameterization. i_nPeaks2 indicates the number of peaks computed. The first element corresponds to the closest-to-the-ground or 1st peak. The second element corresponds to the next-to-last (2nd) peak. The last element corresponds to the closest-to-the-satellite peak. If there are fewer than six peaks, the unused parameters are set to invalid. Rel 34 GLAS Binary Data DS_UTCTime_40
d_solnsigmaSigmas2 DOUBLE
(UNLIMITED, 6)
Gaussian sigma (width) Sigmas of fit parameters (standard)
(NOT_SET)
ns Standard deviation of the sigma (width) parameter from the diagonal of the final covariance matrix using standard parameterization. i_nPeaks2 indicates the number of peaks computed. The first element corresponds to the closest-to-the-ground or 1st peak. The second element corresponds to the next-to-last (2nd) peak. The last element corresponds to the closest-to-the-satellite peak. If there are fewer than six peaks, the unused parameters are set to invalid. Rel 34 GLAS Binary Data DS_UTCTime_40
d_thRtkRngOff2 DOUBLE
(UNLIMITED)
Threshold Retracker Range Offset (standard)
(NOT_SET)
ns Offset to be added to d_refRng to give the two-way range in time to the threshold retracker location on the received echo using standard parameters. Rel 34 GLAS Binary Data DS_UTCTime_40

/ANCILLARY_DATA

/ANCILLARY_DATA

Attribute Example Value
glas_osc_rate 1.000000023
glas_osc_rate_date 2003-10-30
glas_osc_rate_time 00:00:00
sc_osc_rate 0.99999998854809
sc_osc_rate_date 2003-10-30
sc_osc_rate_time 00:00:00
internal_time_delay 0.0000151100
internal_time_delay_date 2003-10-30
internal_time_delay_time 00:00:00
internal_range_delay 9.5560
internal_range_delay_date 2003-10-30
internal_range_delay_time 00:00:00
Additional_Attribute SP_ICE_PATH_NO, SP_ICE_GLAS_StartBlock, SP_ICE_GLAS_EndBlock, ReferenceOrbit, Track, Track_Segment, Cycle, Instance
bss_calib_min_time 122392298.3701589
bss_calib_max_time 122393578.3451884
bss_calib_factor 1.35, 1.3
bss_calib_time 120735000.0, 130326180.0
overall_calib_additive 0.
overall_calib_multiplier 0.862068965
internal_range_delay_desc Internal range calibration bias determined during GLAS instrument integration testing and validated in-flight, meters.
internal_time_delay_desc Internal time calibration bias determined during GLAS instrument integration testing and validated in-flight, seconds.

/METADATA

/METADATA

Attribute Example Value
description This group contains structured, computer-parseable ECHO-style collection and inventory-level metadata.
HDFVersion HDF5 1.8.9
ControlFile cf_name=CTL00_000_20140818_2614265_01_gla05_h5_convert.ctl

/METADATA/COLLECTIONMETADATA

Attribute Example Value
DLLName libDsESDTGlGLASPoly.001Sh.so
GranuleTimeDuration 1620
SpatialSearchType Orbit
DataFileFormat HDF5
ScienceMimeType application/x-hdfeos
BrowseMimeType application/x-hdfeos
BrowseOnlineMimeType image/jpeg
ShortName GLAH05
LongName GLAS/ICESat L1B Global Waveform-based Range Corrections Data (HDF5)
CollectionDescription The level 1B waveform parameterization data will contain waveform-based range corrections and surface characteristics at the full 40 per second resolution. Data granules will contain approximately 23 minutes (1/4 orbit) of data.
VersionID 34
CitationforExternalPublication The 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.
CollectionState In Work
MaintenanceandUpdateFrequency Daily
AccessConstraints Data 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.
TemporalKeyword Day
SpatialKeyword Global

/METADATA/COLLECTIONMETADATA/AdditionalAttributes

Attribute Example Value
Track AdditionalAttributesContainer
Track_Segment AdditionalAttributesContainer
Instrument_State AdditionalAttributesContainer
ReferenceOrbit AdditionalAttributesContainer
SP_ICE_PATH_NO AdditionalAttributesContainer
SP_ICE_GLAS_StartBlock AdditionalAttributesContainer
SP_ICE_GLAS_EndBlock AdditionalAttributesContainer
Cycle AdditionalAttributesContainer
Instance AdditionalAttributesContainer
Instrument_State_Date AdditionalAttributesContainer
Instrument_State_Time AdditionalAttributesContainer
Timing_Drift AdditionalAttributesContainer
Timing_Drift_Date AdditionalAttributesContainer
Timing_Drift_Time AdditionalAttributesContainer
identifier_product_doi AdditionalAttributesContainer
identifier_file_uuid AdditionalAttributesContainer
identifier_product_doi_authority AdditionalAttributesContainer

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Cycle

Attribute Example Value
AdditionalAttributeDatatype int
AdditionalAttributeDescription A count of the number of exact repeats of this reference orbit.
AdditionalAttributeName Cycle
ParameterUnitsofMeasurement counts
ParameterRangeBegin 0
ParameterRangeEnd 250

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Instance

Attribute Example Value
AdditionalAttributeDatatype int
AdditionalAttributeDescription The number of times that we have returned to a specific reference orbit.
AdditionalAttributeName Instance
ParameterUnitsofMeasurement counts
ParameterRangeBegin 1
ParameterRangeEnd 99

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Instrument_State

Attribute Example Value
AdditionalAttributeDatatype int
AdditionalAttributeDescription Flag word that indicates which redundant units (laser, detector, oscillator) of the GLAS instrument are in operation.
AdditionalAttributeName Instrument_State
ParameterUnitsofMeasurement Flag word
ParameterRangeBegin 0
ParameterRangeEnd 5

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Instrument_State_Date

Attribute Example Value
AdditionalAttributeDatatype date
AdditionalAttributeDescription The date that corresponds to the first valid Instrument_State. There are a maximum of two per granule.
AdditionalAttributeName Instrument_State_Date

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Instrument_State_Time

Attribute Example Value
AdditionalAttributeDatatype time
AdditionalAttributeDescription The time that corresponds to the first valid Instrument_State. There are a maximum of two per granule.
AdditionalAttributeName Instrument_State_Time

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/ReferenceOrbit

Attribute Example Value
AdditionalAttributeDatatype int
AdditionalAttributeDescription Assigned number for which exact orbital elements describe the exact repeat orbit pattern.
AdditionalAttributeName ReferenceOrbit
ParameterUnitsofMeasurement Assigned number
ParameterRangeBegin 1
ParameterRangeEnd 30000

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/SP_ICE_GLAS_EndBlock

Attribute Example Value
AdditionalAttributeDatatype int
AdditionalAttributeDescription Integer number within GLAS coverage scheme in which granule data ends.
AdditionalAttributeName SP_ICE_GLAS_EndBlock
ParameterRangeBegin 1
ParameterRangeEnd 360

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/SP_ICE_GLAS_StartBlock

Attribute Example Value
AdditionalAttributeDatatype int
AdditionalAttributeDescription Integer number within GLAS coverage scheme in which granule data starts.
AdditionalAttributeName SP_ICE_GLAS_StartBlock
ParameterRangeBegin 1
ParameterRangeEnd 360

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/SP_ICE_PATH_NO

Attribute Example Value
AdditionalAttributeDatatype int
AdditionalAttributeDescription Number which represents the GLAS path number.
AdditionalAttributeName SP_ICE_PATH_NO
ParameterRangeBegin 1
ParameterRangeEnd 32768

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Timing_Drift

Attribute Example Value
AdditionalAttributeDatatype float
AdditionalAttributeDescription This is the ratio of the true time for a one second oscilator tick to nominal one
AdditionalAttributeName Timing_Drift
ParameterRangeBegin -1.0
ParameterRangeEnd +1.0

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Timing_Drift_Date

Attribute Example Value
AdditionalAttributeDatatype date
AdditionalAttributeDescription The date that corresponds to the first valid Timing_Drift. There are a maximum of two per granule.
AdditionalAttributeName Timing_Drift_Date

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Timing_Drift_Time

Attribute Example Value
AdditionalAttributeDatatype time
AdditionalAttributeDescription The time that corresponds to the first valid Timing_Drift. There are a maximum of two per granule.
AdditionalAttributeName Timing_Drift_Time

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Track

Attribute Example Value
AdditionalAttributeDatatype int
AdditionalAttributeDescription The unique number assigned for each repeat ground track (one orbit) of the reference orbit.
AdditionalAttributeName Track
ParameterUnitsofMeasurement counts
ParameterRangeBegin 0
ParameterRangeEnd 3000

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Track_Segment

Attribute Example Value
AdditionalAttributeDatatype int
AdditionalAttributeDescription Number 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.
AdditionalAttributeName Track_Segment
ParameterUnitsofMeasurement counts
ParameterRangeBegin 1
ParameterRangeEnd 4

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/identifier_file_uuid

Attribute Example Value
AdditionalAttributeDatatype varchar
AdditionalAttributeDescription Universally unique identifier for this data product's files
AdditionalAttributeName identifier_file_uuid

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/identifier_product_doi

Attribute Example Value
AdditionalAttributeDatatype varchar
AdditionalAttributeDescription Digital object identifier that uniquely identifies this data product
AdditionalAttributeName identifier_product_doi

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/identifier_product_doi/InformationContent

Attribute Example Value
ParameterValue 10.5067/ICESAT/GLAS/DATA108

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/identifier_product_doi_authority

Attribute Example Value
AdditionalAttributeDatatype varchar
AdditionalAttributeDescription URL of the digital object identifier resolving authority
AdditionalAttributeName identifier_product_doi_authority

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/identifier_product_doi_authority/InformationContent

Attribute Example Value
ParameterValue http://dx.doi.org

/METADATA/COLLECTIONMETADATA/CSDTDescription

Attribute Example Value
PrimaryCSDT n-Dim Array of Records
IndirectReference tracks/orbits
Implementation HDF
CSDTComments Data 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
GLAH06 CollectionAssociationContainer
GLAH01 CollectionAssociationContainer
GLA00 CollectionAssociationContainer
GLAH12 CollectionAssociationContainer
GLAH13 CollectionAssociationContainer
GLAH14 CollectionAssociationContainer
GLAH15 CollectionAssociationContainer

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLA00

Attribute Example Value
CollectionType Science Associated
CollectionUse The initial collection of GLAS instrument data downlinked from the spacecraft
ShortName GLA00
VersionID 1

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH01

Attribute Example Value
CollectionType Input
CollectionUse Level 1A file containing: altimeter height, waveform data, and other data required to produce the Level 1B waveform products.
ShortName GLAH01
VersionID 33

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH06

Attribute Example Value
CollectionType Dependent
CollectionUse Level 1B file containing: elevations, elevation corrections, surface roughness, reflectance, and associated timing and data quality information
ShortName GLAH06
VersionID 34

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH12

Attribute Example Value
CollectionType Dependent
CollectionUse Level 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.
ShortName GLAH12
VersionID 34

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH13

Attribute Example Value
CollectionType Dependent
CollectionUse Level 2 file containing: Sea Ice Elevation, Reflectance, and Roughness, Ice Berg Elevations and Roughness. The product parameters are the result of product-specialized waveform fitting.
ShortName GLAH13
VersionID 34

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH14

Attribute Example Value
CollectionType Dependent
CollectionUse Level 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.
ShortName GLAH14
VersionID 34

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH15

Attribute Example Value
CollectionType Dependent
CollectionUse Level 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.
ShortName GLAH15
VersionID 34

/METADATA/COLLECTIONMETADATA/ContactOrganization

Attribute Example Value
Data_Originator ContactOrganizationContainer
Archive ContactOrganizationContainer

/METADATA/COLLECTIONMETADATA/ContactOrganization/Archive

Attribute Example Value
Role Archive
HoursofService M-F, 8:00am to 5:00pm, Mountain Time
ContactInstructions For inquiries, contact NSIDC User Services. Primary first level contact.
ContactOrganizationName NSIDC User Services
StreetAddress CIRES/NSIDC University of Colorado Campus, Box 449
City Boulder
StateProvince Colorado
PostalCode 80309-0449
Country USA
TelephoneNumber 303-492-2468
TelephoneNumberType Facsimile
ElectronicMailAddress nsidc@nsidc.org

/METADATA/COLLECTIONMETADATA/ContactOrganization/Data_Originator

Attribute Example Value
Role Data Originator
HoursofService M-F, 8:00am to 4:30pm Eastern Time
ContactInstructions Contact by e-mail first
ContactOrganizationName ICESat Science Investigator-led Processing System (I-SIPS)
StreetAddress Building 33, NASA Goddard Space Flight Center
City Greenbelt
StateProvince Maryland
PostalCode 20771
Country USA
TelephoneNumber 757-864-1238
TelephoneNumberType Voice
ElectronicMailAddress David.W.Hancock@nasa.gov

/METADATA/COLLECTIONMETADATA/ContactPerson

Attribute Example Value
Hancock ContactPersonContainer
Schutz ContactPersonContainer
Zwally ContactPersonContainer
DiMarzio ContactPersonContainer

/METADATA/COLLECTIONMETADATA/ContactPerson/DiMarzio

Attribute Example Value
Role Producer
HoursofService M-F, 8:00am to 4:30pm Eastern Time
ContactInstructions None
ContactJobPosition Deputy Science Software Development Manager
ContactFirstName John
ContactMiddleName P
ContactLastName DiMarzio
StreetAddress Building 33, Rm. B-209D, NASA/GSFC
City Greenbelt
StateProvince Maryland
PostalCode 20771
Country USA
TelephoneNumber 301-614-5893
TelephoneNumberType Voice
ElectronicMailAddress John.P.Dimarzio.1@nasa.gov

/METADATA/COLLECTIONMETADATA/ContactPerson/Hancock

Attribute Example Value
Role Data Originator
HoursofService M-F, 8:00am to 4:30pm. Eastern Time.
ContactInstructions None
ContactJobPosition Science Software Development Manager.
ContactFirstName David
ContactMiddleName W.
ContactLastName Hancock
StreetAddress Building N-159, NASA/GSFC Wallops Flight Facility.
City Wallops Island
StateProvince Virginia
PostalCode 23337
Country USA
TelephoneNumber 757-824-1238
TelephoneNumberType Voice
ElectronicMailAddress David.W.Hancock@nasa.gov

/METADATA/COLLECTIONMETADATA/ContactPerson/Schutz

Attribute Example Value
Role Investigator
HoursofService M-F, 8:00am to 4:30pm Central Time
ContactInstructions None
ContactJobPosition GLAS Science Team Leader
ContactFirstName Bob
ContactMiddleName E
ContactLastName Schutz
StreetAddress 3925 W. Braker Lane, Center for Space Research
City Austin
StateProvince Texas
PostalCode 78759-5321
Country USA
TelephoneNumber 512-471-4267
TelephoneNumberType Voice
ElectronicMailAddress schutz@utcsr.ae.utexas.edu

/METADATA/COLLECTIONMETADATA/ContactPerson/Zwally

Attribute Example Value
Role Producer
HoursofService M-F, 8:00am to 4:30pm Eastern Time
ContactInstructions None.
ContactJobPosition ICESat Project Scientist
ContactFirstName Jay
ContactLastName Zwally
StreetAddress Building 33, Rm A-217
City Greenbelt
StateProvince Maryland
PostalCode 20771
Country USA
TelephoneNumber 301-614-5643
TelephoneNumberType Voice
ElectronicMailAddress Jay.Zwally@nasa.gov

/METADATA/COLLECTIONMETADATA/DisciplineTopicParameters

Attribute Example Value
Land_Surface DisciplineTopicParametersContainer
Hydrosphere DisciplineTopicParametersContainer
Cryosphere DisciplineTopicParametersContainer

/METADATA/COLLECTIONMETADATA/DisciplineTopicParameters/Cryosphere

Attribute Example Value
ECSDisciplineKeyword Earth Science
ECSTopicKeyword Cryosphere
ECSTermKeyword Glaciers/Ice Sheets
ECSVariableKeyword Glacier Elevation/Ice Sheet Elevation

/METADATA/COLLECTIONMETADATA/DisciplineTopicParameters/Hydrosphere

Attribute Example Value
ECSDisciplineKeyword Earth Science
ECSTopicKeyword Hydrosphere
ECSTermKeyword Glaciers/Ice Sheets
ECSVariableKeyword Glacier Elevation/Ice Sheet Elevation

/METADATA/COLLECTIONMETADATA/DisciplineTopicParameters/Land_Surface

Attribute Example Value
ECSDisciplineKeyword Earth Science
ECSTopicKeyword Land Surface
ECSTermKeyword Topography
ECSVariableKeyword Terrain Elevation

/METADATA/COLLECTIONMETADATA/ECSCollection

Attribute Example Value
RevisionDate 2013-11-07
SuggestedUsage GLAH05 contains scientific investigations of surface features defined by the waveform parameterization. File contains range corrections and the parameterizations of the waveform that were used to calculate surface elevation, and other surface characteristics. The data values were used as input data values to compute parameters on GLAH06 and GLAH12-15. Each GLAH05 file was created from an equivalent GLA05 binary formatted file. The provenance metadata shows the history that created the GLA05.
ProcessingCenter GSFC I-SIPS
ArchiveCenter NSIDC
VersionDescription GLASHDF 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)
DatasetDisclaimerPointer http://nsidc.org/data/icesat/disclaimer.html
ECSCollectionGuidePointer http://nsidc.org/data/docs/daac/glas_icesat_l1_l2_global_altimetry.gd.html
ECSCollectionGuidePointerComment Guide Document for this product at NSIDC
MiscellaneousInformationPointer http://nsidc.org/daac/icesat/index.html
MiscellaneousInformationPointerComment GLAS Product page at NSIDC

/METADATA/COLLECTIONMETADATA/Platform

Attribute Example Value
ICESat PlatformContainer

/METADATA/COLLECTIONMETADATA/Platform/ICESat

Attribute Example Value
PlatformShortName ICESat
PlatformLongName Ice, Cloud, and Land Elevation Satellite
PlatformType Spacecraft

/METADATA/COLLECTIONMETADATA/Platform/ICESat/Instrument

Attribute Example Value
GLAS InstrumentContainer
GPS InstrumentContainer

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

Attribute Example Value
InstrumentShortName GLAS
InstrumentLongName Geoscience Laser Altimeter System
InstrumentTechnique Laser Altimetry and Light Detection and Radar
NumberofSensors 3

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

Attribute Example Value
SwathWidth InstrumentCharacteristicContainer

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

Attribute Example Value
InstrumentCharacteristicName SwathWidth
InstrumentCharacteristicDescription The width of the sensor scan as the satellite moves along the ground track.
InstrumentCharacteristicDataType int
InstrumentCharacteristicUnit kilometers
InstrumentCharacteristicValue 2

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

Attribute Example Value
LA SensorContainer
PC SensorContainer
CD SensorContainer

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

Attribute Example Value
SensorShortName CD
SensorLongName Cloud LIDAR
SensorTechnique Measure of 1064nm return energy in 75m bins from 20km to surface

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

Attribute Example Value
wavelength SensorCharacteristicContainer

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

Attribute Example Value
SensorCharacteristicName wavelength
SensorCharacteristicDescription detector
SensorCharacteristicDataType varchar
SensorCharacteristicUnit nanometer
SensorCharacteristicValue 1064 nm

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

Attribute Example Value
SensorShortName LA
SensorLongName Laser Altimeter
SensorTechnique Exact Measurement of Time between Transmit Pulse and receive ground return

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

Attribute Example Value
wavelength SensorCharacteristicContainer
waveform SensorCharacteristicContainer

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

Attribute Example Value
SensorCharacteristicName waveform
SensorCharacteristicDescription digitizer
SensorCharacteristicDataType varchar
SensorCharacteristicUnit counts
SensorCharacteristicValue 0-255

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

Attribute Example Value
SensorCharacteristicName wavelength
SensorCharacteristicDescription transmission
SensorCharacteristicDataType varchar
SensorCharacteristicUnit nanometer
SensorCharacteristicValue 1064 nm

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

Attribute Example Value
SensorShortName PC
SensorLongName Photon Counter for the 532 nm Aerosol Returns
SensorTechnique Counting of 532nm photon return in 75m bins 40km to surface

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

Attribute Example Value
wavelength SensorCharacteristicContainer

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

Attribute Example Value
SensorCharacteristicName wavelength
SensorCharacteristicDescription detector
SensorCharacteristicDataType varchar
SensorCharacteristicUnit nanometer
SensorCharacteristicValue 532nm

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

Attribute Example Value
InstrumentShortName GPS
InstrumentLongName Global Positioning System Receiver
InstrumentTechnique Radionavigation
NumberofSensors 1

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

Attribute Example Value
GPS_Receiver SensorContainer

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

Attribute Example Value
SensorShortName GPS Receiver
SensorLongName Dual frequency GPS receiver
SensorTechnique Pseudorange and carrier phase

/METADATA/COLLECTIONMETADATA/Platform/ICESat/PlatformCharacteristic

Attribute Example Value
OrbitInclination PlatformCharacteristicContainer
OrbitalPeriod PlatformCharacteristicContainer

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

Attribute Example Value
PlatformCharacteristicName OrbitInclination
PlatformCharacteristicDescription Angle between the orbit plane and the Earth's equatorial plane
PlatformCharacteristicDataType float
PlatformCharacteristicUnit Degrees
PlatformCharacteristicValue 94.0

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

Attribute Example Value
PlatformCharacteristicName OrbitalPeriod
PlatformCharacteristicDescription Orbital period in decimal minutes.
PlatformCharacteristicDataType float
PlatformCharacteristicUnit Minutes
PlatformCharacteristicValue 96.7

/METADATA/COLLECTIONMETADATA/ProcessingLevel

Attribute Example Value
ProcessingLevelDescription Geophysical Quantities at the sensor resolution or geolocated
ProcessingLevelID 1B

/METADATA/COLLECTIONMETADATA/Review

Attribute Example Value
ScienceReviewDate 2001-03-04
ScienceReviewStatus QA at DAACs
FutureReviewDate 2001-09-04

/METADATA/COLLECTIONMETADATA/Spatial

Attribute Example Value
SpatialCoverageType Horizontal
WestBoundingCoordinate -180.0
NorthBoundingCoordinate 90.0
EastBoundingCoordinate 180.0
SouthBoundingCoordinate -90.0

/METADATA/COLLECTIONMETADATA/StorageMediumClass

Attribute Example Value
StorageMedium Online

/METADATA/COLLECTIONMETADATA/Temporal

Attribute Example Value
TimeType UTC
DateType J2000
TemporalRangeType Continuous Range
PrecisionofSeconds 2
EndsatPresentFlag Y
RangeBeginningDate 2003-01-13
RangeBeginningTime 00:00:00
RangeEndingDate 2010-01-13
RangeEndingTime 00:00:00

/METADATA/INVENTORYMETADATA

Attribute Example Value
PGEVersion Version 1.4
ShortName GLAH05
VersionID 34
RangeBeginningTime 01:51:38
RangeEndingTime 02:12:57
RangeBeginningDate 2003-11-18
RangeEndingDate 2003-11-18

/METADATA/INVENTORYMETADATA/ECSDataGranule

Attribute Example Value
ReprocessingPlanned no further update anticipated
ReprocessingActual reprocessed
LocalGranuleID GLAH05_634_2103_002_0407_1_01_0001.H5
ProductionDateTime 2014-08-19T06:08:34
LocalVersionID 634

/METADATA/INVENTORYMETADATA/InputGranule

Attribute Example Value
InputPointer CTL00_000_20140818_2614265_01_gla05_h5_convert.ctl, tai-utc.dat, GLA05_634_2103_002_0407_1_01_0001.DAT, DsESDTGlGLAH05.034.desc

/METADATA/INVENTORYMETADATA/OrbitCalculatedSpatialDomain

Attribute Example Value
OrbitNumber 4604
StartOrbitNumber 4604
StopOrbitNumber 4604
EquatorCrossingLongitude -103.22287
EquatorCrossingTime 01:38:10
EquatorCrossingDate 2003-11-18

/METADATA/INVENTORYMETADATA/ProductSpecificMetadata

Attribute Example Value
Track 407
Track_Segment 1
Instrument_State 373338
ReferenceOrbit 1
SP_ICE_PATH_NO 3429
SP_ICE_GLAS_StartBlock NOT SET
SP_ICE_GLAS_EndBlock NOT SET
Cycle 2
Instance 3
Instrument_State_Date 2003-10-30
Instrument_State_Time 00:00:00
identifier_product_doi 10.5067/ICESAT/GLAS/DATA108
identifier_file_uuid 2868de04-82ed-4282-94b3-24f078a309d8
identifier_product_doi_authority http://dx.doi.org

/METADATA/PROVENANCE

/METADATA/PROVENANCE/STEP_1

Attribute Example Value
ProcessDateTime 2014-05-24T04:01:03

/METADATA/PROVENANCE/STEP_1/ProcessAgent

Attribute Example Value
Name glas_alt
Type 1B
Version 6.1
Description This process is an instantiation of the GLAS Science Algorithm Software (GSAS) 1B ATBDs.

/METADATA/PROVENANCE/STEP_1/ProcessInput

Attribute Example Value
Name GLA01_033_2103_002_0407_1_02_0001.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, 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, anc52_007_01_0001.dat, anc52_007_01_0002.dat, anc59_001_01_0001.dat
Type GLA01, ANC04, anc07, anc07, anc07, anc07, anc07, anc07, anc07, ANC08, ANC09, anc12, anc12, anc25, anc27, anc27, ANC33, anc41, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc52, anc52, anc59
Version 033, 007, 034, 034, 034, 034, 034, 034, 034, 015, 076, 004, 004, 005, 001, 001, 001, 009, 034, 034, 034, 034, 034, 034, 034, 034, 034, 034, 034, 034, 034, 034, 034, 007, 007, 001

/METADATA/PROVENANCE/STEP_1/ProcessOutput

Attribute Example Value
Name GLA05_634_2103_002_0407_1_01_0001.DAT
Type GLA05
Version 634

/METADATA/PROVENANCE/STEP_2

Attribute Example Value
ProcessDateTime 2014-08-19T06:08:34.000000Z

/METADATA/PROVENANCE/STEP_2/ProcessAgent

Attribute Example Value
Name GLA05_h5_convert
Type Data_Reformat
Version Version 1.4 (July 2014)
Description GLA05 Conversion PGE

/METADATA/PROVENANCE/STEP_2/ProcessInput

Attribute Example Value
Name ./CTL00_000_20140818_2614265_01_gla05_h5_convert.ctl, ./tai-utc.dat, ./GLA05_634_2103_002_0407_1_01_0001.DAT, ./DsESDTGlGLAH05.034.desc
Type IN_CNTL, IN_ANC_TAIUTC, IN_GLA05, IN_ESDT
Version 0, 0, 1, 1

/METADATA/PROVENANCE/STEP_2/ProcessOutput

Attribute Example Value
Name ./GLAH05_634_2103_002_0407_1_01_0001.H5
Type OUT_GLAH05
Version 1
UUID 2868de04-82ed-4282-94b3-24f078a309d8
DOI 10.5067/ICESAT/GLAS/DATA108

Page last updated: 09/18/14