GLAH07 Product Data Dictionary

File-Level (Global) Attributes

Attribute Example Value
featureType timeSeries
ShortName GLAH07
title GLAS/ICESat L1B Global Backscatter Data (HDF5)
comment The product includes full 532 nm and 1064 nm calibrated attenuated backscatter profiles at 5 times per second, and from 10 to -1 km, at 40 times per second. Also the calibration coefficient values and molecular backscatter profiles at once per second.
summary GLAH07 contains calibrated backscatter profiles that allow heights of planetary boundary layers, aerosol layers, and cloud to be subsequently determined. The level 1B global backscatter data is provided at full instrument resolution. Each GLAH07 file was created from an equivalent GLA07 binary formatted file. The data used to create the GLAH07 values are contained in the equivalent GLAHxx files for the GLAxx files as shown in the provenance metadata for the creation of the GLA07.
license http://nsidc.org/data/icesat/disclaimer.html
references http://nsidc.org/data/docs/daac/glas_icesat_l1_l2_global_atmosphere.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 2012-12-20T20:16:43
spatial_coverage_type Horizontal
history 2011-06-20T15:27:20 glas_atm 6.0.1 GLA07_633_2103_002_0407_0_01_0001.DAT, 2012-12-20T20:16:43.000000Z GLA07_h5_convert Version 1.0 (December 2012) out/GLAH07_633_2103_002_0407_0_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 > Atmosphere > Atmospheric Radiation > Scattering > Aerosol Backscatter Cross Section Profile, Earth Science > Atmosphere > Aerosols > Aerosol Backscatter > Aerosol Backscatter Cross Section Profile, Earth Science > Land Surface > Topography > Terrain Elevation
keywords_vocabulary GCMD Science Keywords Version 6.0
standard_vocabulary_name CF-1.6
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 2003-11-18T05:04:55
time_coverage_duration 11620
source Satellite Measurements
HDFVersion HDF5 1.8.9
identifier_file_uuid 599740C3-F062-4F49-A756-8A0DA37BC95B
identifier_product_doi 10.5067/ICESAT/GLAS/DATA107
identifier_product_type GLAH07
identifier_product_format_version 1.0
Conventions CF-1.6
institution National Aeronautics and Space Administration (NASA)


Group: /Data_1HZ

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

Dimension Scales

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 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 33 GLAS Binary Data NOT_SET
DS_HeightRel_280 DOUBLE
(UNLIMITED)
Relative Height
(NOT_SET)
NOT_SET This array contains the height above the DEM, where DEM = DEMmin+HoffMin. This dimension is used for the array r_ir_mbscs Constants NOT_SET
DS_HeightRel_548 DOUBLE
(UNLIMITED)
Relative Height
(NOT_SET)
NOT_SET This array contains the height above the DEM, where DEM = DEMmin+HoffMin. This dimension is used for the array r_g_mbscs Constants NOT_SET
DS_BG_Index INTEGER
(UNLIMITED)
Index for r1_g_BG
(NOT_SET)
NOT_SET This array contains the index for r1_g_BG Constants 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 33 GLAS Binary Data DS_UTCTime_1
shot_time_flg INTEGER_1
(UNLIMITED)
time correction flag
(NOT_SET)
NOT_SET Shot time;0=shot time is transmit time;1=shot time is ground bounce time

flag values flag_meanings
0, 1 transmit_time ground_bounce_time
Rel 33 GLAS Binary Data DS_UTCTime_1
gps_time_flg INTEGER_1
(UNLIMITED)
time correction flag
(NOT_SET)
NOT_SET GPS time;0=no delta gps time correction applied to shot time;1=delta gps time correction applied to shot time

flag values flag_meanings
0, 1 not_applied applied
Rel 33 GLAS Binary Data DS_UTCTime_1
pl_timing_flg INTEGER_1
(UNLIMITED)
time correction flag
(NOT_SET)
NOT_SET Post-launch timing;0=no post-launch timing bias applied;1=post-launch timing bias applied - see header for value

flag values flag_meanings
0, 1 not_applied applied
Rel 33 GLAS Binary Data DS_UTCTime_1
ddelay_flg INTEGER_1
(UNLIMITED)
time correction flag
(NOT_SET)
NOT_SET Digitizer turn-on delay;0=digitizer turn-on delay accounted for in shot time - see header;1=digitizer turn-on delay not accounted for in shot time

flag values flag_meanings
0, 1 applied not_applied
Rel 33 GLAS Binary Data DS_UTCTime_1
peaktp_flg INTEGER_1
(UNLIMITED)
time correction flag
(NOT_SET)
NOT_SET Peak of transmit pulse;0=time to peak of transmit pulse accounted for in shot time;1=time to peak of transmit pulse not accounted for in shot time

flag values flag_meanings
0, 1 applied not_applied
Rel 33 GLAS Binary Data DS_UTCTime_1

Group: Data_1HZ/Packet_data

This group contains the APID flags.

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 33 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 33 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 33 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 33 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 33 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 33 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 33 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 33 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 33 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 33 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 33 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 33 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 33 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 33 GLAS Binary Data DS_UTCTime_1
apid_ASCT_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Command and Telemetry (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 33 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 - Laser Monitor Board, Temperature Controller Module, Motor Control System & High Voltage Power Supply Housekeeping Telemetry) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 33 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 - Power Distribution Unit (PDU) Housekeeping Telemetry) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 33 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 - Housekeeping Temperatures #1 Telemetry) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 33 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 - Housekeeping Temperatures #2 Telemetry) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 33 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 - Small Software #2 Telemetry) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 33 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 - Small Software #1 Telemetry) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 33 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 - Large Software Telemetry #1) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 33 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 - Large Software Telemetry #2) APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 33 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 33 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 33 GLAS Binary Data DS_UTCTime_1
apid_LPA_1_flg INTEGER_1
(UNLIMITED)
APID Data Availability Flag
(NOT_SET)
NOT_SET Laser Pulse Array (LPA) packet #1 APID availability flag

flag values flag_meanings
0, 1, 2 present filled_at_EDOS never_received_ISIPS_filled
Rel 33 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 33 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 33 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 33 GLAS Binary Data DS_UTCTime_1

Group: Data_1HZ/Quality

This group contains the quality-related flags.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
orbit_pred_flg INTEGER_1
(UNLIMITED)
POD flag (Orbit Flag)
(NOT_SET)
NOT_SET Predicted or precision orbit;0=precision orbit used;1=predicted orbit used;2=on-board orbit used

flag values flag_meanings
0, 1, 2 precision_orbit_used predicted_orbit_used onboard_orbit_used
Rel 33 GLAS Binary Data DS_UTCTime_1
orbit_man_flg INTEGER_1
(UNLIMITED)
POD flag (Orbit Flag)
(NOT_SET)
NOT_SET Maneuvers;0=no maneuvers;1=maneuvers occurred during this record; orbit degraded

flag values flag_meanings
0, 1 no_maneuvers maneuvers_occurred_during_this_record
Rel 33 GLAS Binary Data DS_UTCTime_1
orbit_model_flg INTEGER_1
(UNLIMITED)
POD flag (Orbit Flag)
(NOT_SET)
NOT_SET Model problems;0=no model problems;1=model problems; orbit RMS > 5 cm; required accuracy not met

flag values flag_meanings
0, 1 no_model_problems model_problems
Rel 33 GLAS Binary Data DS_UTCTime_1
orbit_att_flg INTEGER_1
(UNLIMITED)
POD flag (Orbit Flag)
(NOT_SET)
NOT_SET Attitude;0=instrument attitude used for orbit;1=modeled attitude used, possible orbit degradation

flag values flag_meanings
0, 1 instrument_attitude_used_for_orbit modeled_attitude_used
Rel 33 GLAS Binary Data DS_UTCTime_1
orbit_array_flg INTEGER_1
(UNLIMITED)
POD flag (Orbit Flag)
(NOT_SET)
NOT_SET Solar ray orientation;0=solar ray orientation used from measurement;1=modeled solar ray orientation, possible orbit degradation

flag values flag_meanings
0, 1 solar_ray_orientation_used_from measurement modeled_solar_ray_orientation
Rel 33 GLAS Binary Data DS_UTCTime_1
orbit_gps_flg INTEGER_1
(UNLIMITED)
POD flag (Orbit Flag)
(NOT_SET)
NOT_SET GPS;0=no GPS data outage;1=GPS data missing from portion of this record, possible degradation

flag values flag_meanings
0, 1 no_GPS_data_outage GPS_data_missing
Rel 33 GLAS Binary Data DS_UTCTime_1
att_offnadir_flg INTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SET Off-nadir angle; 0=off-nadir angle within limits;1=large off-nadir angle

flag values flag_meanings
0, 1 within_limit outside_limits
Rel 33 GLAS Binary Data DS_UTCTime_1
att_oceansw_flg INTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SET Ocean sweep;0=non-ocean sweep, 1=within time frame of ocean sweep

flag values flag_meanings
0, 1 not_ocean_sweep ocean_sweep
Rel 33 GLAS Binary Data DS_UTCTime_1
att_pointing_flg INTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SET Target of opportunity off-pointing;0=not within target of opportunity off-pointing 1=within time of target of opportunity off-pointing

flag values flag_meanings
0, 1 not_pointing pointing
Rel 33 GLAS Binary Data DS_UTCTime_1
att_steering_flg INTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SET Steering to reference track;0=not within target of opportunity off-pointing 1=within time of target of opportunity off-pointing

flag values flag_meanings
0, 1 not_pointing pointing
Rel 33 GLAS Binary Data DS_UTCTime_1
att_actual_flg INTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SET 0=i_AttFlg_1 through i_AttFlg_3 have been set based on actual data 1=i_AttFlg_1 through i_AttFlg_3 have not been set - IGNORE these flags

flag values flag_meanings
0, 1 actual ignore
Rel 33 GLAS Binary Data DS_UTCTime_1
att_ist_flg INTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SET IST data;0 = IST data is good 1 = Missing IST for at least a portion of the time of this frame 2 = Noisy IST for at least a portion of the time of this frame 3 = Noisy and missing IST 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 33 GLAS Binary Data DS_UTCTime_1
att_gyro_flg INTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SET GYRO data;0 = GYRO data is good 1 = Missing GYRO for at least a portion of the time of this frame 2 = Noisy GYRO for at least a portion of the time of this frame 3 = Noisy and missing GYRO 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 33 GLAS Binary Data DS_UTCTime_1
att_lrs_flg INTEGER_1
(UNLIMITED)
Attitude Flag 1
(NOT_SET)
NOT_SET LRS Data;0 = LRS data good, consists of star, laser and CRS 1 = LRS data good, but no star data for at least a portion of this frame 2 = LRS data good, but no laser data for at least a portion of this frame 3 = LRS data good, but no CRS data for at least a portion of this frame 4 = LRS data good, but only CRS data for at least a portion of this frame 5 = LRS data good, but only laser data for at least a portion of this frame 6 = LRS data good, but only star data for at least a portion of this frame 7 = 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 33 GLAS Binary Data DS_UTCTime_1
i_DitheringEnabledFlag INTEGER_1
(UNLIMITED)
Dithering Enabled Flag
(NOT_SET)
NOT_SET 0=dithering not enabled, 1=dithering enabled

flag values flag_meanings
0, 1 false true
Rel 33 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 Profile coordinate in the IERS Terrestrial Reference Frame: east longitude and north latitude, at the 1 hertz rate. Rel 33 GLAS Binary Data DS_UTCTime_1
d_lon DOUBLE
(UNLIMITED)
Spot 1 Coordinate Data, Longitude Corrected
(longitude)
degrees_east Profile coordinate in the IERS Terrestrial Reference Frame: east longitude and north latitude, at the 1 hertz rate. Rel 33 GLAS Binary Data DS_UTCTime_1

Group: Data_1HZ/Background

This group contains information relating to the background noise.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
r1_g_BG REAL
(UNLIMITED, 4)
532nm Background at 1 Hz
(NOT_SET)
counts The normalized 532 nm background counts from upper (1) and lower (2) integration intervals. (3) is background used to compute NRB. (1) Upper Background (256 us avg), (2) Lower Background (256 us avg), (3) The one used, (4) Below ground background (from the portion of profile below ground). Averaged over 40 shots. Rel 33 GLAS Binary Data DS_UTCTime_1

Group: Data_1HZ/Flags

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

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
surf_ld_flg INTEGER_1
(UNLIMITED)
Region Type
(NOT_SET)
NOT_SET Region type;0=no Land;1=Land

flag values flag_meanings
0, 1 no_land land
Rel 33 GLAS Binary Data DS_UTCTime_1
surf_si_flg INTEGER_1
(UNLIMITED)
Region Type
(NOT_SET)
NOT_SET Region type;0=no Sea Ice;1=Sea Ice

flag values flag_meanings
0, 1 no_sea_ice sea_ice
Rel 33 GLAS Binary Data DS_UTCTime_1
surf_oc_flg INTEGER_1
(UNLIMITED)
Region Type
(NOT_SET)
NOT_SET Region type;0=no Ocean;1=Ocean

flag values flag_meanings
0, 1 no_ocean ocean
Rel 33 GLAS Binary Data DS_UTCTime_1
surf_is_flg INTEGER_1
(UNLIMITED)
Region Type
(NOT_SET)
NOT_SET Region type;0=no Ice Sheet;1=Ice Sheet

flag values flag_meanings
0, 1 no_ice_sheet ice_sheet
Rel 33 GLAS Binary Data DS_UTCTime_1
i_AttFlg3 INTEGER_1
(UNLIMITED)
Attitude Flag 3
(NOT_SET)
NOT_SET Attitude Flag 3, 0=PAD used for geolocation, 1=PAD not used for geolocation.

flag values flag_meanings
0, 1 pad_used pad_not_used
Rel 33 GLAS Binary Data DS_UTCTime_1
i_metFlg_src INTEGER_1
(UNLIMITED)
Met/std atm source/quality flag
(NOT_SET)
NOT_SET Flag indicating if met data or standard atmosphere data are used to fill met profiles. The met data used by the atmospheric processing routines normally consists of 2 global gridded data sets, one before the GLAS observation time and one after. They are both normally within 6 hours of the GLAS observation time. A check is made on the time of the MET files and if either one is > 24 hours from the GLAS observation time, it is not used. If both files are not used, then the standard atmosphere data is according to the latitude and season. 0: use both met files; 1: use first met file; 2: use second met file; 3: use standard atmosphere, arctic summer, 4: use standard atmosphere, arctic winter, 5: use standard atmosphere, midlatitude summer, 6: use standard atmosphere, midlatitude winter, 7: use standard atmosphere, tropical.

flag values flag_meanings
0, 1, 2, 3, 4, 5, 6, 7 both_met_files first_met_file second_met_file std_atm_arctic_summer std_atm_arctic_winter std_atm_midlatitude_summer std_atm_midlatitude_winter std_atm_tropical
Rel 33 GLAS Binary Data DS_UTCTime_1
i_LidarQF INTEGER_1
(UNLIMITED)
Lidar Frame quality flag
(NOT_SET)
NOT_SET Lidar frame quality flag. 0=good data, 1=data unsuitable for L2 processing due to weak 532 laser energy or high background.

flag values flag_meanings
0, 1 good unsuitable
Rel 33 GLAS Binary Data DS_UTCTime_1
i1_g_bscs_qf INTEGER_1
(UNLIMITED)
532 nm Attenuated Backscatter Vertical Profile Flag(1 hz)
(NOT_SET)
NOT_SET Quality flag at 1Hz. 0=good quality; 2=532nm integrated return is bad; 3=ratio of integrated return to molecular integrated return is bad.

flag values flag_meanings
0, 2, 3 good 532_return_bad ratio_integrated_return_to_molecular_integrated_return_bad
Rel 33 GLAS Binary Data DS_UTCTime_1
i_g_cal_qf INTEGER_1
(UNLIMITED)
532 nm Attenuated Backscatter Vertical Profile Flag(1 hz)
(NOT_SET)
NOT_SET Quality flag: value 0 = good quality; value 2 = if no records left after elimination tests, value before elimination tests used instead

flag values flag_meanings
0, 2, 3 good no_records_left_after_elimination_tests value_before_elimination_tests_used_instead
Rel 33 GLAS Binary Data DS_UTCTime_1
i_g_cal_dnf INTEGER_1
(UNLIMITED)
532 nm Attenuated Backscatter Vertical Profile Flag(1 hz)
(NOT_SET)
NOT_SET Day/night flag at 1Hz. 0=indetermanent; 1=night; 2=day.

flag values flag_meanings
0, 1, 2 indetermanent night day
Rel 33 GLAS Binary Data DS_UTCTime_1
i_ir_cal_qf INTEGER_1
(UNLIMITED)
1064 nm Attenuated Backscatter Vertical Profile Flag
(NOT_SET)
NOT_SET Quality flag at 1Hz. 0=good quality; 2=if no records left after elimination tests, value before elimination tests used instead.

flag values flag_meanings
0, 2, 3 good no_records_left_after_elimination_tests value_before_elimination_tests_used_instead
Rel 33 GLAS Binary Data DS_UTCTime_1

Group: Data_1HZ/Geophysical

This group contains geophysical parameters.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
r_Surface_pres REAL
(UNLIMITED)
Surface Pressure
(surface_temperature)
hPa Atmospheric pressure at Earth's surface level measured in hPa and derived from the meteorological data files. Rel 33 GLAS Binary Data DS_UTCTime_1
r_Surface_relh REAL
(UNLIMITED)
Relative Humidity
(surface_air_pressure)
percent Atmospheric relative humidity at Earth's surface level measured as a percentage and derived from the meteorological data files. Rel 33 GLAS Binary Data DS_UTCTime_1
r_Surface_temp REAL
(UNLIMITED)
Surface Temperature
(relative_humidity)
degree Celsius Atmospheric temperature at Earth's surface level measured in degrees Celsius and derived from the meteorological data files. Rel 33 GLAS Binary Data DS_UTCTime_1
r_Surface_wdir REAL
(UNLIMITED)
Surface Wind Direction Azimuth from North
(NOT_SET)
degrees Wind direction at Earth's surface level measured in degrees of azimuth from North and derived from the meteorological data files. Rel 33 GLAS Binary Data DS_UTCTime_1
r_Surface_wind REAL
(UNLIMITED)
Surface Wind Speed
(NOT_SET)
meters/second Wind speed at Earth's surface level measured in km/hour and derived from the meteorological data files. Rel 33 GLAS Binary Data DS_UTCTime_1
r_atm_dem REAL
(UNLIMITED)
DEM value at current location from 1 km x 1 km grid
(NOT_SET)
meters Surface height value for current location from 1 km x 1 km grid Rel 33 GLAS Binary Data DS_UTCTime_1
r_topo_elev REAL
(UNLIMITED)
Topographic elevation of surface above geoid
(NOT_SET)
meters Topographic elevation of surface above geoid based upon POD, PAD, and geoid Rel 33 GLAS Binary Data DS_UTCTime_1

Group: Data_1HZ/Angle

This group contains reflectivity information.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
r_beam_azimuth REAL
(UNLIMITED)
Azimuth
(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 33 GLAS Binary Data DS_UTCTime_1
r_beam_coelev REAL
(UNLIMITED)
Co-elevation
(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 33 GLAS Binary Data DS_UTCTime_1
r_pad_angle REAL
(UNLIMITED)
PAD Angle
(NOT_SET)
degrees Attitude angle calculated from PAD and POD. Rel 33 GLAS Binary Data DS_UTCTime_1

Group: Data_1HZ/Surface

This group contains surface related information.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
r_rng_geoid REAL
(UNLIMITED)
Range of satellite above geoid
(NOT_SET)
meters Range of satellite above geoid based upon POD, PAD, and geoid Rel 33 GLAS Binary Data DS_UTCTime_1
r_Rng2CDProf_Cor REAL
(UNLIMITED)
Start Range of 1064 nm Backscatter Profile
(NOT_SET)
kilometers The range from the spacecraft to the start of the 1064 nm backscatter profile - the start of the 20 KM segment of Lidar Data. This variable has a slight correction applied to it. Rel 33 GLAS Binary Data DS_UTCTime_1
r_Rng2PCProf_Cor REAL
(UNLIMITED)
Start Range of 532 nm Backscatter Profile
(NOT_SET)
meters The range from the spacecraft to the start of the 532 nm backscatter profile - the start of the 40 KM segment of Lidar Data. This variable has a slight correction applied to it. Rel 33 GLAS Binary Data DS_UTCTime_1
i_ir_bin_shift INTEGER
(UNLIMITED)
1064 vertical alignment offset
(NOT_SET)
NOT_SET Number of bins that 1064 nm surface return bin is shifted to align with 532 nm surface return bin. Rel 33 GLAS Binary Data DS_UTCTime_1

Group: Data_1HZ/Reflectivity

This group contains reflectivity information.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
r_SolAng REAL
(UNLIMITED)
Solar Angle
(NOT_SET)
Degrees Solar Angle above or below the plane tangent to the ellipsoid surface at the laser spot. Positive values mean the sun is above the horizon, while negative values mean it is below the horizon. The effect of atmospheric refraction is not included. This is a low-precision value, with approximately one degree accuracy. Rel 33 GLAS Binary Data DS_UTCTime_1

Group: Data_1HZ/Backscatter

This group contains information related to backscatter.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
r_g_cal_cof_high REAL
(UNLIMITED)
532 nm Backscatter Calibration Coefficient high
(NOT_SET)
(counts)(km^3/J)sr The calibration value applied to the 532 nm lidar data to get the backscatter (high cal ht). Rel 33 GLAS Binary Data DS_UTCTime_1
r_g_cal_cof_low REAL
(UNLIMITED)
532 nm Backscatter Calibration Coefficient low
(NOT_SET)
(counts)(km^3/J)sr The calibration value applied to the 532 nm lidar data to get the backscatter (low cal ht). Rel 33 GLAS Binary Data DS_UTCTime_1
r_g_cal_cof_used REAL
(UNLIMITED)
532 nm Backscatter Calibration Coefficient used
(NOT_SET)
(counts)(km^3/J)sr The calibration value applied to the 532 nm lidar data to get the backscatter (used). Rel 33 GLAS Binary Data DS_UTCTime_1
r_ir_cal_cof_low REAL
(UNLIMITED)
1064 nm Backscatter Calibration Coefficienthigh
(NOT_SET)
(Watts)(km^3/J)sr The calibration value applied to the 1064 nm lidar data to get the backscatter (low cal ht). Rel 33 GLAS Binary Data DS_UTCTime_1
r_ir_cal_cof_used REAL
(UNLIMITED)
1064 nm Backscatter Calibration Coefficient used
(NOT_SET)
(Watts)(km^3/J)sr The calibration value applied to the 1064 nm lidar data to get the backscatter (used). Rel 33 GLAS Binary Data DS_UTCTime_1
r1_int_ret REAL
(UNLIMITED)
532 nm integrated return from 40 to 20 km
(NOT_SET)
1/(m-sr) The integrated or summed 532 attenuated backscatter profile from 40 to 20 km. When normalized by the sum of the molecular backscatter for the same interval, gives an indication of data quality Rel 33 GLAS Binary Data DS_UTCTime_1
r_g_mbscs REAL
(UNLIMITED, 548)
532 nm molecular backscatter cross section profile 40 to -1 km
(NOT_SET)
1/(m-sr) 532 nm molecular backscatter profile computed from MET data interpolated in space and time to profile location. Rel 33 GLAS Binary Data DS_UTCTime_1
r_ir_mbscs REAL
(UNLIMITED, 280)
1064 nm molecular backscatter cross section profile 20 to -1 km
(NOT_SET)
1/(m-sr) 1064 nm molecular backscatter profile computed from MET data interpolated in space and time to profile location. Rel 33 GLAS Binary Data DS_UTCTime_1


Group: /Data_5HZ/

This group contains data with a rate of 5HZ. 5Hz 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_5 DOUBLE
(UNLIMITED)
Transmit Time of First Shot in frame in J2000
(time)
seconds The transmit time of five shots 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 33 GLAS Binary Data NOT_SET
DS_HeightRel_280 DOUBLE
(UNLIMITED)
Relative Height
(NOT_SET)
NOT_SET This array contains the height above the DEM, where DEM = DEMmin+HoffMin. This dimension is used for the array r5_ir_bscs Constants NOT_SET
DS_HeightRel_548 DOUBLE
(UNLIMITED)
Relative Height
(NOT_SET)
NOT_SET This array contains the height above the DEM, where DEM = DEMmin+HoffMin. This dimension is used for the arrays r5_g_bscs and i5_g_sat_prof Constants NOT_SET
DS_BG_Index INTEGER
(UNLIMITED)
Index for r5_g_BG and r5_ir_BG
(NOT_SET)
NOT_SET This array contains the index for r5_g_BG and r5_ir_BG Constants NOT_SET

Group: Data_5HZ/Time

This group contains the 5HZ 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 33 GLAS Binary Data DS_UTCTime_5
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 33 GLAS Binary Data DS_UTCTime_5

Group: Data_5HZ/Geolocation

This group contains geolocation-related parameters.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
d_lat DOUBLE
(UNLIMITED)
Coordinate Data, Latitude Corrected
(latitude)
degrees_north Profile coordinate in the IERS Terrestrial Reference Frame: east longitude and north latitude, at the 5 hertz rate. Rel 33 GLAS Binary Data DS_UTCTime_5
d_lon DOUBLE
(UNLIMITED)
Coordinate Data, Longitude Corrected
(longitude)
degrees_east Profile coordinate in the IERS Terrestrial Reference Frame: east longitude and north latitude, at the 5 hertz rate. Rel 33 GLAS Binary Data DS_UTCTime_5

Group: Data_5HZ/Backscatter

This group contains the 5HZ backscatter-related parameters.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
r5_g_bscs REAL
(UNLIMITED, 548)
532 nm Merged Attenuated Backscatter Profile 40 to -1 km
(NOT_SET)
1/(m-sr) For the full vertical atmospheric profile (-1 to 41 km), the atmosphere 532 nm calibrated, attenuated backscatter profile at the rate of 5 per 1 second. When the 532 nm data becomes saturated the 1064 nm data is converted and merged into the data set. The Level 1A data that occurs at 5/second, every 8 shots are averaged and stored in the profile and the 1/second is replicated to get the full 5 Hz rate on this product. Rel 33 GLAS Binary Data DS_UTCTime_5
r5_ir_bscs REAL
(UNLIMITED, 280)
1064 nm Attenuated Backscatter Profile 20 to -1 km
(NOT_SET)
1/(m-sr) Atmosphere 1064 nm calibrated, attenuated backscatter profile (-1 to 20 km) at the rate of 5 per 1 second. Averages of 8 shots are used for the Level 1A data that occurs at 5/second rate. Rel 33 GLAS Binary Data DS_UTCTime_5

Group: Data_5HZ/Flags

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

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
i5_g_bscs_uf INTEGER_1
(UNLIMITED)
532 nm Attenuated Backscatter Vertical Profile Flag(5hz)
(NOT_SET)
NOT_SET Use flag at 5 Hz. 0=no, saturated bins were not replaced; 1=yes, saturated bins were replaced.

flag values flag_meanings
0, 1 saturated_bins_not_replaced saturated_bins_replaced
Rel 33 GLAS Binary Data DS_UTCTime_5
i5_g_bscs_qf INTEGER_1
(UNLIMITED)
532 nm Attenuated Backscatter Vertical Profile Flag(5hz)
(NOT_SET)
NOT_SET Quality flag at 5Hz: value 0 = good data; value 1 = if 532 nm laser energy flag equals 3; value 2 = if 1064 nm quality flag equals 1 and 1064 nm backscatter value replaced 532 nm backscatter value

flag values flag_meanings
0, 1, 2 good 532nm_laser_energy_flag_equals_3 1064nm_quality_flag_equals_1_and_1064nm_backscatter_value_replaced_532nm_backscatter_value
Rel 33 GLAS Binary Data DS_UTCTime_5
i5_ir_bscs_qf INTEGER_1
(UNLIMITED)
1064 nm Attenuated Backscatter Vertical Profile Flag
(NOT_SET)
NOT_SET Quality flag at 5Hz. 0=good data; 1=1064 nm laser energy flag equals 3

flag values flag_meanings
0, 1 good 1064_laser_energy_flag_is_3
Rel 33 GLAS Binary Data DS_UTCTime_5
i5_g_sat_prof INTEGER_1
(UNLIMITED, 548)
532 nm Saturation Flag Profile 40 to -1 km
(NOT_SET)
NOT_SET 532 nm Saturation Flag Profile from 41 to -1 km. Indicates whether the 532 data were saturated and therefore whether the value is converted from the 1064 data. 1 bit per each shot(5) per bin (548); 0 = not saturated, 1 = saturated.

flag values flag_meanings
0, 1 not_saturated saturated.
Rel 33 GLAS Binary Data DS_UTCTime_5

Group: Data_5HZ/Background

This group contains information relating to the background noise.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
r5_g_BG REAL
(UNLIMITED, 4)
532 nm Background at 5 Hz
(NOT_SET)
counts The normalized 532 nm background counts from upper (1) and lower (2) integration intervals. (3) is background used to compute NRB. (1) Upper Background (256 us avg), (2) Lower Background (256 us avg), (3) The one used, (4) Below ground background (from the portion of profile below ground). Averaged over 8 shots. Rel 33 GLAS Binary Data DS_UTCTime_5
r5_ir_BG REAL
(UNLIMITED, 4)
1064 nm Background at 5 Hz
(NOT_SET)
W The normalized 1064 nm background counts from upper (1) and lower (2) integration intervals. (3) is background used to compute NRB. (1) Upper Background (256 us avg), (2) Lower Background (256 us avg), (3) The one used, (4) Below ground background (from the portion of profile below ground). Averaged over 8 shots. Rel 33 GLAS Binary Data DS_UTCTime_5

Group: Data_5HZ/Transmit_Energy

This group contains transmit energy parameters.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
r5_g_TxNrg_EU REAL
(UNLIMITED)
532 nm Laser Transmit Energy at 5 Hz
(NOT_SET)
Joules The 532 nm transmitted pulse energy in energy units, converted from the counts from the transmitted energy monitor. Averaged over 8 shots. Rel 33 GLAS Binary Data DS_UTCTime_5
r5_ir_TxNrgEU REAL
(UNLIMITED)
1064 nm Laser Transmit Energy at 5 Hz
(NOT_SET)
Joules The 1064 nm laser pulse energy, computed from the digitized outgoing pulse and the detector temperature. Averaged over 8 shots. Rel 33 GLAS Binary Data DS_UTCTime_5


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 First Shot in frame in J2000
(time)
seconds 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 33 GLAS Binary Data NOT_SET
DS_HeightRel_148 DOUBLE
(UNLIMITED)
Relative Height
(NOT_SET)
NOT_SET This array contains the height above the DEM, where DEM = DEMmin+HoffMin. This dimension is used for the arrays r40_g_bscs r40_ir_bscs and i40_g_sat_prof Constants NOT_SET
DS_BG_Index INTEGER
(UNLIMITED)
Index for r40_g_BG and r40_ir_BG
(NOT_SET)
NOT_SET This array contains the index for r40_g_BG and r40_ir_BG 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 33 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 33 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)
Coordinate Data, Latitude, specific to ice sheet range
(NOT_SET)
degrees_north Profile coordinate in the IERS Terrestrial Reference Frame: east longitude and north latitude, at the 40 hertz rate. Rel 33 GLAS Binary Data DS_UTCTime_40
d_lon DOUBLE
(UNLIMITED)
Coordinate Data, Longitude, specific to ice sheet range
(NOT_SET)
degrees_east Profile coordinate in the IERS Terrestrial Reference Frame: east longitude and north latitude, at the 40 hertz rate. Rel 33 GLAS Binary Data DS_UTCTime_40

Group: Data_40HZ/Backscatter

This group contains the 40HZ backscatter-related parameters.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
r40_g_bscs REAL
(UNLIMITED, 148)
532 nm Merged Attenuated Backscatter Profile 10 to -1 km
(NOT_SET)
1/(m-sr) For the 10 KM to -1 KM vertical segment, the atmosphere 532 nm calibrated, attenuated backscatter profile at the 40 per 1 second rate. When the 532 nm data becomes saturated the 1064 nm data is converted to 532 data and merged into the data set. Rel 33 GLAS Binary Data DS_UTCTime_40
r40_ir_bscs REAL
(UNLIMITED, 148)
1064 nm Attenuated Backscatter Profile 10 to -1 km
(NOT_SET)
1/(m-sr) Atmosphere 1064 nm calibrated, attenuated backscatter profile (-1 to 10 km) at the rate of 40 per 1 second. Rel 33 GLAS Binary Data DS_UTCTime_40
r40_g_BG REAL
(UNLIMITED, 4)
532 nm Background at 40 Hz
(NOT_SET)
counts The normalized 532 nm background counts from upper (1) and lower (2) integration intervals. (3) is background used to compute NRB. (1) Upper Background (256 us avg), (2) Lower Background (256 us avg), (3) The one used, (4) Below ground background (from the portion of profile below ground). Rel 33 GLAS Binary Data DS_UTCTime_40
r40_ir_BG REAL
(UNLIMITED, 4)
1064 nm Background at 40 Hz
(NOT_SET)
W The normalized 1064 nm background counts from upper (1) and lower (2) integration intervals. (3) is background used to compute NRB. (1) Upper Background (256 us avg), (2) Lower Background (256 us avg), (3) The one used, (4) Below ground background (from the portion of profile below ground). Rel 33 GLAS Binary Data DS_UTCTime_40

Group: Data_40HZ/Flags

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

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
i40_g_bscs_uf INTEGER_1
(UNLIMITED)
532 nm Attenuated Backscatter Vertical Profile Flag(40hz)
(NOT_SET)
NOT_SET Use flag at 40Hz. 0=no, saturated bins were not replaced; 1=yes, saturated bins were replaced.

flag values flag_meanings
0, 1 saturated_bins_not_replaced saturated_bins_replaced
Rel 33 GLAS Binary Data DS_UTCTime_40
i40_g_bscs_qf INTEGER_1
(UNLIMITED)
532 nm Attenuated Backscatter Vertical Profile Flag(40hz)
(NOT_SET)
NOT_SET Quality flag at 40Hz. 0=good data; 1=532 nm laser energy flag equals 3; 2=1064 nm quality flag equals 1 and the 1064 nm backscatter value replaced the 532 nm backscatter value.

flag values flag_meanings
0, 1, 2 good 532nm_laser_energy_flag_equals_3 1064nm_quality_flag_equals_1_and_1064nm_backscatter_value_replaced_532nm_backscatter_value
Rel 33 GLAS Binary Data DS_UTCTime_40
i40_ir_bscs_qf INTEGER_1
(UNLIMITED)
1064 nm Attenuated Backscatter Vertical Profile Flag
(NOT_SET)
NOT_SET Quality flag at 40Hz. 0=good data; 1=1064 nm laser energy flag equals 3

flag values flag_meanings
0, 1 good 1064_laser_energy_flag_is_3
Rel 33 GLAS Binary Data DS_UTCTime_40
i40_g_sat_prof INTEGER_1
(UNLIMITED, 148)
532 nm Saturation Flag Profile 10 to -1 km
(NOT_SET)
NOT_SET 532 nm Saturation Flag Profile from 10 to -1 km. Indicates whether the 532 data were saturated and therefore whether the value is converted from the 1064 data. 0 = not saturated, 1 = saturated.

flag values flag_meanings
0, 1 not_saturated saturated
Rel 33 GLAS Binary Data DS_UTCTime_40
i_g_TxNrg_qf INTEGER_1
(UNLIMITED)
532 nm Laser Transmit Energy Quality Flag
(NOT_SET)
NOT_SET Evaluation of the 532 nm laser transmit energy which is an indication of the laser health; 2 bits per shot for 40 shots; 0 = not used, 1 = full laser energy, 2 = marginal laser energy, 3 = deficient laser energy.

flag values flag_meanings
0, 1, 2, 3 not_used full_laser_energy marginal_laser_energy deficient_laser_energy
Rel 33 GLAS Binary Data DS_UTCTime_40
i_ir_TxNrg_qf INTEGER_1
(UNLIMITED)
1064 nm Laser Transmit Energy Quality Flag
(NOT_SET)
NOT_SET Evaluation of the 1064 nm laser transmit energy which is an indication of the laser health; 2 bits per shot for 40 shots; 1 = full laser energy, 2 = marginal laser energy, 3 = deficient laser energy, 0 = not used.

flag values flag_meanings
0, 1, 2, 3 not_used full_laser_energy marginal_laser_energy deficient_laser_energy
Rel 33 GLAS Binary Data DS_UTCTime_40

Group: Data_40HZ/Transmit_Energy

This group contains transmit energy parameters.

Label Datatype
(Dimensions)
long_name
(standard_name)
units description source coordinates
r40_g_TxNrg_EU REAL
(UNLIMITED)
532 nm Laser Transmit Energy at 40 Hz
(NOT_SET)
Joules The 532 nm transmitted pulse energy in energy units, converted from the counts from the transmitted energy monitor. Rel 33 GLAS Binary Data DS_UTCTime_40
r40_ir_TxNrgEU REAL
(UNLIMITED)
1064 nm Laser Transmit Energy at 40 Hz
(NOT_SET)
Joules The 1064 nm laser pulse energy, computed from the digitized outgoing pulse and the detector temperature. Rel 33 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, PercentGroundHit, Percent1064to532, Cycle, Instance
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=gla07_test.ctl

/METADATA/COLLECTIONMETADATA

Attribute Example Value
DLLName libDsESDTGlGLASPoly.001Sh.so
GranuleTimeDuration 11620
SpatialSearchType Orbit
DataFileFormat HDF5
ScienceMimeType application/x-hdfeos
BrowseMimeType application/x-hdfeos
BrowseOnlineMimeType image/jpeg
ShortName GLAH07
LongName GLAS/ICESat L1B Global Backscatter Data (HDF5)
CollectionDescription The product includes full 532 nm and 1064 nm calibrated attenuated backscatter profiles at 5 times per second, and from 10 to -1 km, at 40 times per second. Also the calibration coefficient values and molecular backscatter profiles at once per second.
VersionID 33
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
PercentGroundHit AdditionalAttributesContainer
Percent1064to532 AdditionalAttributesContainer
Track AdditionalAttributesContainer
Instrument_State AdditionalAttributesContainer
ReferenceOrbit AdditionalAttributesContainer
Cycle AdditionalAttributesContainer
SP_ICE_PATH_NO AdditionalAttributesContainer
SP_ICE_GLAS_StartBlock AdditionalAttributesContainer
SP_ICE_GLAS_EndBlock AdditionalAttributesContainer
Instance AdditionalAttributesContainer
Instrument_State_Date AdditionalAttributesContainer
Instrument_State_Time AdditionalAttributesContainer
Timing_Bias AdditionalAttributesContainer
Timing_Bias_Date AdditionalAttributesContainer
Timing_Bias_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 is 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 is a maximum of two per granule.
AdditionalAttributeName Instrument_State_Time

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Percent1064to532

Attribute Example Value
AdditionalAttributeDatatype float
AdditionalAttributeDescription Percent atmospheric profiles that use the 1064 nm profile data to provide estimated values for the saturated 532nm profiles.
AdditionalAttributeName Percent1064to532
ParameterUnitsofMeasurement Percent
ParameterRangeBegin 0.0
ParameterRangeEnd 100.0
ParameterValueAccuracy 1
ParameterMeasurementResolution 1

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/PercentGroundHit

Attribute Example Value
AdditionalAttributeDatatype float
AdditionalAttributeDescription Percent of data for this granule that had a detected ground return of the transmitted laser pulse.
AdditionalAttributeName PercentGroundHit
ParameterUnitsofMeasurement Percent
ParameterRangeBegin 0.0
ParameterRangeEnd 100.0
ParameterValueAccuracy 1
ParameterMeasurementResolution 1

/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_Bias

Attribute Example Value
AdditionalAttributeDatatype int
AdditionalAttributeDescription The time tag error determined by the calibration team that was added to the time tags to compute the true time of data as provided on the granule.
AdditionalAttributeName Timing_Bias
ParameterUnitsofMeasurement Microseconds
ParameterRangeBegin -1000000
ParameterRangeEnd +1000000

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Timing_Bias_Date

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

/METADATA/COLLECTIONMETADATA/AdditionalAttributes/Timing_Bias_Time

Attribute Example Value
AdditionalAttributeDatatype time
AdditionalAttributeDescription The time that corresponds to the first valid Timing_Bias. There are a maximum of two per granule.
AdditionalAttributeName Timing_Bias_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/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/DATA107

/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/CollectionAssociation

Attribute Example Value
GLA00 CollectionAssociationContainer
GLAH02 CollectionAssociationContainer
GLAH08 CollectionAssociationContainer
GLAH09 CollectionAssociationContainer
GLAH10 CollectionAssociationContainer
GLAH11 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/GLAH02

Attribute Example Value
CollectionType Input
CollectionUse Level 1A atmospheric data product file containing: normalized lidar signals.
ShortName GLAH02
VersionID 33

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH08

Attribute Example Value
CollectionType Dependent
CollectionUse Level 2 file containing: planetary boundary layer heights and aerosol layer top and bottom.
ShortName GLAH08
VersionID 33

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH09

Attribute Example Value
CollectionType Dependent
CollectionUse Level 2 file containing: cloud layer top and bottom heights.
ShortName GLAH09
VersionID 33

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH10

Attribute Example Value
CollectionType Dependent
CollectionUse Level 2 file containing: cloud- and aerosol- attenuation corrected backscatter and extinction profiles.
ShortName GLAH10
VersionID 33

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH11

Attribute Example Value
CollectionType Dependent
CollectionUse Level 2 file containing: cloud and aerosol layer optical depths.
ShortName GLAH11
VersionID 33

/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
Atmosphere DisciplineTopicParametersContainer
Land_Surface DisciplineTopicParametersContainer

/METADATA/COLLECTIONMETADATA/DisciplineTopicParameters/Atmosphere

Attribute Example Value
ECSDisciplineKeyword Earth Science
ECSTopicKeyword Atmosphere
ECSTermKeyword Aerosols
ECSVariableKeyword Aerosol Backscatter

/METADATA/COLLECTIONMETADATA/DisciplineTopicParameters/Atmosphere/ECSParameter

Attribute Example Value
ECSParameterKeyword Aerosol Backscatter Cross Section Profile

/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 2012-06-25
SuggestedUsage GLAH07 contains calibrated backscatter profiles that allow heights of planetary boundary layers, aerosol layers, and cloud to be subsequently determined. The level 1B global backscatter data is provided at full instrument resolution. Each GLAH07 file was created from an equivalent GLA07 binary formatted file. The data used to create the GLAH07 values are contained in the equivalent GLAHxx files for the GLAxx files as shown in the provenance metadata for the creation of the GLA07.
ProcessingCenter GSFC I-SIPS
ArchiveCenter NSIDC
VersionDescription Initial Version
DatasetDisclaimerPointer http://nsidc.org/data/icesat/disclaimer.html
ECSCollectionGuidePointer http://nsidc.org/data/docs/daac/glas_icesat_l1_l2_global_atmosphere.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/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 1.0
ShortName GLAH07
VersionID 33
RangeBeginningTime 01:51:38
RangeEndingTime 05:04:55
RangeBeginningDate 2003-11-18
RangeEndingDate 2003-11-18

/METADATA/INVENTORYMETADATA/ECSDataGranule

Attribute Example Value
ReprocessingPlanned no further update anticipated
ReprocessingActual reprocessed
LocalGranuleID GLAH07_633_2103_002_0407_0_01_0001.H5
ProductionDateTime 2012-12-20T20:16:43
LocalVersionID 33

/METADATA/INVENTORYMETADATA/InputGranule

Attribute Example Value
InputPointer gla07_test.ctl, tai-utc.dat, GLA07_633_2103_002_0407_0_01_0001.P0310, DsESDTGlGLAH07.033.desc

/METADATA/INVENTORYMETADATA/MeasuredParameter

Attribute Example Value
ParameterName 532nm_Attenuated_Backscatter, 1064nm_Attenuated_Backscatter

/METADATA/INVENTORYMETADATA/OrbitCalculatedSpatialDomain

Attribute Example Value
OrbitNumber 4604, 4605, 4606
StartOrbitNumber 4604
StopOrbitNumber 4606
EquatorCrossingLongitude -103.22287, -127.41792, -151.61336
EquatorCrossingTime 01:38:10, 03:14:50, 04:51:29
EquatorCrossingDate 2003-11-18, 2003-11-18, 2003-11-18

/METADATA/INVENTORYMETADATA/ProductSpecificMetadata

Attribute Example Value
PercentGroundHit 0
Percent1064to532 0
Track 407, 408, 409
Instrument_State 373338
ReferenceOrbit 1
Cycle 2
SP_ICE_PATH_NO 3429, 3430, 3431
SP_ICE_GLAS_StartBlock NOT SET
SP_ICE_GLAS_EndBlock NOT SET
Instance 3
Instrument_State_Date 2003-10-30
Instrument_State_Time 00:00:00
identifier_product_doi 10.5067/ICESAT/GLAS/DATA107
identifier_file_uuid 599740C3-F062-4F49-A756-8A0DA37BC95B
identifier_product_doi_authority http://dx.doi.org

/METADATA/PROVENANCE

/METADATA/PROVENANCE/STEP_1

Attribute Example Value
ProcessDateTime 2011-06-20T15:27:20

/METADATA/PROVENANCE/STEP_1/ProcessAgent

Attribute Example Value
Name glas_atm
Type 1B
Version 6.0.1
Description This process is an instantiation of the GLAS Science Algorithm Software (GSAS) 1B ATBDs.

/METADATA/PROVENANCE/STEP_1/ProcessInput

Attribute Example Value
Name GLA02_033_2103_002_0407_0_02_0001.DAT, GLA02_033_2103_002_0409_0_02_0001.DAT, GLA05_633_2103_002_0407_1_01_0001.DAT, GLA05_633_2103_002_0407_2_01_0001.DAT, GLA05_633_2103_002_0407_3_01_0001.DAT, GLA05_633_2103_002_0407_4_01_0001.DAT, GLA05_633_2103_002_0408_1_01_0001.DAT, GLA05_633_2103_002_0408_2_01_0001.DAT, GLA05_633_2103_002_0408_3_01_0001.DAT, GLA05_633_2103_002_0408_4_01_0001.DAT, GLA05_633_2103_002_0409_1_01_0001.DAT, ANC01_006_20031117_180000_01_0000.DAT, ANC01_006_20031118_000000_01_0000.DAT, ANC01_006_20031117_180000_01_0002.DAT, ANC01_006_20031118_000000_01_0002.DAT, ANC01_006_20031117_180000_01_0003.DAT, ANC01_006_20031118_000000_01_0003.DAT, ANC01_006_20031117_180000_01_0004.DAT, ANC01_006_20031118_000000_01_0004.DAT, ANC01_006_20031117_180000_01_0001.DAT, ANC01_006_20031118_000000_01_0001.DAT, ANC01_006_20031117_180000_01_0005.DAT, ANC01_006_20031118_000000_01_0005.DAT, ANC01_006_20031117_180000_01_0006.DAT, ANC01_006_20031118_000000_01_0006.DAT, ANC01_006_20031117_180000_01_0007.DAT, ANC01_006_20031118_000000_01_0007.DAT, ANC01_006_20031117_180000_01_0008.DAT, ANC01_006_20031118_000000_01_0008.DAT, ANC01_006_20031117_180000_01_0009.DAT, ANC01_006_20031118_000000_01_0009.DAT, ANC01_006_20031117_180000_01_0010.DAT, ANC01_006_20031118_000000_01_0010.DAT, ANC04_007_20031117_235947_01_0001.DAT, anc07_033_02_0000.dat, anc07_033_02_0001.dat, anc07_033_02_0002.dat, anc07_033_02_0003.dat, anc07_033_02_0004.dat, anc07_033_02_0005.dat, anc07_033_02_0006.dat, ANC08_015_20031117_235947_01_0001.DAT, ANC09_076_20031117_235947_01_0001.DAT, anc12_004_01_0000.dat, anc12_004_01_0001.dat, anc13_006_01_0000.dat, anc18_001_01_0000.dat, anc25_005_20090101_000000_01_0000.dat, anc27_001_01_0000.dat, anc27_001_01_0001.dat, anc30_004_20030925_000000_01_0000.dat, anc31_004_20030925_000000_01_0000.dat, ANC33_001_20100406_000000_01_0000.DAT, anc35_001_01_0000.dat, ANC36_033_21_03002_0407_0_01_0001.DAT, ANC36_033_21_03002_0409_0_01_0001.DAT, anc38_005_01_0001.dat, anc38_005_01_0002.dat, anc38_005_01_0003.dat, anc38_005_01_0004.dat, anc41_009_01_0000.dat, anc45_033_03_0001.dat, anc45_033_03_0002.dat, anc45_033_03_0003.dat, anc45_033_03_0004.dat, anc45_033_03_0005.dat, anc45_033_03_0006.dat, anc45_033_03_0007.dat, anc45_033_03_0008.dat, anc45_033_03_0009.dat, anc45_033_03_0010.dat, anc45_033_03_0011.dat, anc45_033_03_0012.dat, anc45_033_03_0013.dat, anc45_033_03_0014.dat, anc45_033_03_0015.dat
Type GLA02, GLA02, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC04, anc07, anc07, anc07, anc07, anc07, anc07, anc07, ANC08, ANC09, anc12, anc12, anc13, anc18, anc25, anc27, anc27, anc30, anc31, ANC33, anc35, ANC36, ANC36, anc38, anc38, anc38, anc38, anc41, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45, anc45
Version 033, 033, 633, 633, 633, 633, 633, 633, 633, 633, 633, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 007, 033, 033, 033, 033, 033, 033, 033, 015, 076, 004, 004, 006, 001, 005, 001, 001, 004, 004, 001, 001, 033, 033, 005, 005, 005, 005, 009, 033, 033, 033, 033, 033, 033, 033, 033, 033, 033, 033, 033, 033, 033, 033

/METADATA/PROVENANCE/STEP_1/ProcessOutput

Attribute Example Value
Name GLA07_633_2103_002_0407_0_01_0001.DAT
Type GLA07
Version 633

/METADATA/PROVENANCE/STEP_2

Attribute Example Value
ProcessDateTime 2012-12-20T20:16:43.000000Z

/METADATA/PROVENANCE/STEP_2/ProcessAgent

Attribute Example Value
Name GLA07_h5_convert
Type Data_Reformat
Version Version 1.0 (December 2012)
Description GLA07 Conversion PGE

/METADATA/PROVENANCE/STEP_2/ProcessInput

Attribute Example Value
Name ./gla07_test.ctl, ../../data/tai-utc.dat, in/GLA07_633_2103_002_0407_0_01_0001.P0310, ../../glas_hdf/data/esdts/DsESDTGlGLAH07.033.desc
Type IN_CNTL, IN_ANC_TAIUTC, IN_GLA07, IN_ESDT
Version 0, 0, 1, 1

/METADATA/PROVENANCE/STEP_2/ProcessOutput

Attribute Example Value
Name out/GLAH07_633_2103_002_0407_0_01_0001.H5
Type OUT_GLAH07
Version 1
UUID 599740C3-F062-4F49-A756-8A0DA37BC95B
DOI 10.5067/ICESAT/GLAS/DATA107

Page last updated: 02/21/2013