GLAH11 Product Data Dictionary

File-Level (Global) Attributes

Attribute	Example Value
featureType	timeSeries
ShortName	GLAH11
title	GLAS/ICESat L2 Global Thin Cloud/Aerosol Optical Depths Data (HDF5)
comment	The level 2 thin cloud/aerosol data contains optical depths for clouds for up to 10 layers, the planetary boundary layer, and aerosols for up to 8 layers. Data granules will contain approximately 23 hours (14 orbits) of data.
summary	The purpose of GLAH11 is to provide the thin cloud/aerosol optical depth data to researchers. Cloud data are provided at 1Hz and aerosol data are provided at .25Hz. Each GLAH11 file was created from an equivalent GLA11 binary file. The data used to create the GLAH11 values are contained in the equivalent GLAHxx files for the GLAxx files. See the provenance metadata for the creation of the GLA11.
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	2
date_created	2013-02-08T12:02:51
spatial_coverage_type	Horizontal
history	2011-06-20T15:27:20 glas_atm 6.0.1 GLA11_633_2103_002_0407_0_01_0001.DAT, 2013-02-08T12:02:51.000000Z GLA11_h5_convert Version 1.1 (February 2013) out/GLAH11_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 > Clouds > Cloud Optical Depth/Thickness, Earth Science > Atmosphere > Aerosols > Aerosol Optical Depth/Thickness
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	2003-11-19T00:24:45
time_coverage_duration	81280
source	Satellite Measurements
HDFVersion	HDF5 1.8.9
identifier_file_uuid	599740C3-F062-4F49-A756-8A0DA37BC95B
identifier_product_doi	10.5067/ICESAT/GLAS/DATA204
identifier_product_type	GLAH11
identifier_product_format_version	1.0
Conventions	CF-1.6
institution	National Aeronautics and Space Administration (NASA)

Group: /Data_4s

This group contains data with a rate of once per 4 seconds. 4 second 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_4s	DOUBLE (UNLIMITED)	Transmit Time of First Shot in frame in J2000 (time)	seconds	The transmit time of the first shot in the 4 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_Cloud_Layer_2	INTEGER (UNLIMITED)	Cloud Layer Index (NOT_SET)	NOT_SET	This array contains the cloud layer index, up to 2	Constants	NOT_SET
DS_Cloud_Layer_8	INTEGER (UNLIMITED)	Cloud Layer Index (NOT_SET)	NOT_SET	This array contains the cloud layer index, up to 8	Constants	NOT_SET
DS_Cloud_Layer_9	INTEGER (UNLIMITED)	Cloud Layer Index (NOT_SET)	NOT_SET	This array contains the cloud layer index, up to 9	Constants	NOT_SET

Group: Data_4s/Time

This group contains the 4s 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_4s
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_4s
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_4s
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_4s
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_4s
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_4s

Group: Data_4s/Geolocation

This group contains geolocation-related parameters.

Label	Datatype (Dimensions)	long_name (standard_name)	units	description	source	coordinates
d_lat	DOUBLE (UNLIMITED)	Profile Location, Latitude (latitude)	degrees_north	Profile coordinate in the IERS Terrestrial Reference Frame: east longitude and north latitude, at the 0.25 hertz rate.	Rel 33 GLAS Binary Data	DS_UTCTime_4s
d_lon	DOUBLE (UNLIMITED)	Profile Location, Longitude (longitude)	degrees_east	Profile coordinate in the IERS Terrestrial Reference Frame: east longitude and north latitude, at the 0.25 hertz rate.	Rel 33 GLAS Binary Data	DS_UTCTime_4s

Group: Data_4s/Flags

This group contains flags at 1 per 4 sec.

Label	Datatype (Dimensions)	long_name (standard_name)	units	description	source	coordinates
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_4s

Group: Data_4s/PBL4_od

This group contains the 4 second PBL Optical Depth related parameters

Label	Datatype (Dimensions)	long_name (standard_name)	units	description	source	coordinates
r_aer4_ht	REAL (UNLIMITED)	Low Resolution PBL Height at 532 nm (Planetary Boundary Layer)	meters	Low resolution Planetary Boundary Layer height at 0.25hz, 1 per profile	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_PBL_LR_grd_det	REAL (UNLIMITED)	Low Resolution Ground Detection at 532 nm (NOT_SET)	meters	Low resolution processed ground detection height at 0.25hz, 1 per profile	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_pbl4_od	REAL (UNLIMITED)	PBL Optical Depth at 532 nm (NOT_SET)	NOT_SET	532 nm Planetary Boundary Layer aerosol optical depth, corrected for multiple scattering at 0.25hz, 1 per layer, 1 layer	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_PBL_LR_pres	REAL (UNLIMITED)	Pressure of Low Resolution Planetary Boundary Layer Top at 532 nm (NOT_SET)	hPa	Pressure of Low Resolution Planetary Boundary Layer Top at 532 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_PBL_LR_relh	REAL (UNLIMITED)	Relative Humidity of Low Resolution Planetary Boundary Layer Top at 532 nm (NOT_SET)	percent	Relative Humidity of Low Resolution Planetary Boundary Layer Top at 532 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_PBL_LR_temp	REAL (UNLIMITED)	Temperature of Low Resolution Planetary Boundary Layer Top at 532 nm (NOT_SET)	degree Celsius	Temperature of Low Resolution Planetary Boundary Layer Top at 532 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s

Group: Data_4s/LowResAerosol_OD

This group contains the low Resolution Aerosol Optical Depth 1064 parameters

Label	Datatype (Dimensions)	long_name (standard_name)	units	description	source	coordinates
r_aer4_bot	REAL (UNLIMITED, 8)	Low Resolution Aerosol Layer Bottom at 532 nm (NOT_SET)	meters	Low resolution aerosol layer bottom heights for layers which were selected for optical processing at 0.25hz, 1 per layer, 9 layers including the planetary boundary layer and PSC	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_aer4_top	REAL (UNLIMITED, 8)	Low Resolution Aerosol Layer Top at 532 nm (NOT_SET)	meters	Low resolution aerosol layer top heights for layers which were selected for optical processing at 0.25hz, 1 per layer, 9 layers including the planetary boundary layer and PSC	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_aer4_od	REAL (UNLIMITED, 8)	Aerosol Optical Depth at 532 nm (NOT_SET)	NOT_SET	532 nm elevated aerosol optical depth, corrected for multiple scattering, at 0.25hz, 1 per layer, 8 layers	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_aer4_aod_ratio	REAL (UNLIMITED, 9)	532/1064 aerosol optical depth ratio (NOT_SET)	NOT_SET	The ratio of 532 nm aerosol optical depth to 1064 nm aerosol optical depth for each detected aerosol layer.	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_aer4_msf	REAL (UNLIMITED, 9)	Aerosol Multiple Scattering Factor (NOT_SET)	NOT_SET	Aerosol multiple scattering coefficient used at 0.25hz, up to 9 layers (including PSC and PBL)	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_aer4_sval_ratio	REAL (UNLIMITED, 9)	532/1064 aerosol S ratio (NOT_SET)	NOT_SET	The ratio of 532 nm extinction to backscatter ratio (S532) to the 1064 nm extinction to backscatter ratio (S1064) for each detected aerosol layer.	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_aer4_sval1	REAL (UNLIMITED, 9)	Aerosol true S Values from table (NOT_SET)	sr	Aerosol true extinction to backscatter ratios calculated from meteorological and geographic data	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_bot_pres	REAL (UNLIMITED, 9)	Aerosol Layers Pressure at Bottom of Layer at 532 nm (NOT_SET)	hPa	Aerosol Layers Pressure at Bottom of Layer at 532 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_bot_relh	REAL (UNLIMITED, 9)	Aerosol Layers Relative Humidity at Bottom of Layer at 532 nm (NOT_SET)	percent	Aerosol Layers Relative Humidity at Bottom of Layer at 532 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_bot_temp	REAL (UNLIMITED, 9)	Aerosol Layers Temperature at Bottom of Layer at 532 nm (NOT_SET)	degree Celsius	Aerosol Layers Temperature at Bottom of Layer at 532 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_top_pres	REAL (UNLIMITED, 9)	Aerosol Layers Pressure at Top of Layer at 532 nm (NOT_SET)	hPa	Aerosol Layers Pressure at Top of Layer at 532 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_top_relh	REAL (UNLIMITED, 9)	Aerosol Layers Relative Humidity at Top of Layer at 532 nm (NOT_SET)	percent	Aerosol Layers Relative Humidity at Top of Layer at 532 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_top_temp	REAL (UNLIMITED, 9)	Aerosol Layers Temperature at Top of Layer at 532 nm (NOT_SET)	degree Celsius	Aerosol Layers Temperature at Top of Layer at 532 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_aod_4s	REAL (UNLIMITED)	Total Column Aerosol OD (AOD) (NOT_SET)	NOT_SET	Total column aerosol optical depth (AOD).	Rel 33 GLAS Binary Data	DS_UTCTime_4s
i_aod_flg_4s	INTEGER_1 (UNLIMITED)	AOD use flag (NOT_SET)	NOT_SET	AOD use flag. The total column AOD use flag ranges from 0 - 7 and has the following meanings: 0 - night, full column good, no bad layers, ground detected - highest quality; 1 - day, no full column, sum of all detected layers, no bad layers, ground detected - highest daytime quality; 2 - night, full column good, with detected lower layers with a bad layer; 3 - night, full column good, with bad lower layers; 4 - night, full column bad, includes only detected lower layers.; 5 - day, no full column, sum of all good layers, but bad layer present; 6 - night, full column good, but no ground detected; 7 - day, no full column, good or no layers, but no ground detected; 15 - invalid Notes: In the descriptions above 'full column' means the extinction retrieval from 20 km to d_aod_botht_4s. 'Bad layer' means a layer for which extinction could not be computed. flag_values flag_meanings 0, 1, 2, 3, 4, 5, 6, 7, 15 night_highest_qual day_highest_qual night_bad_layer night_bad_layers night_only_lower day_bad_layer night_no_grnd day_no_grnd invalid	Rel 33 GLAS Binary Data	DS_UTCTime_4s
i_pbl4_uf	INTEGER_1 (UNLIMITED)	PBL optical depth flag for 532 nm (NOT_SET)	NOT_SET	Use Flag Meaning for PBL: 0 - none (use your default Sa); 1 - sulfate+carbon (67.5 sr); 2 - carbon (62.0 sr); 3 - salt+dust (32.5 sr); 4 - salt (28.5 sr); 5 - sulfate (60.0 sr); 6 - dust+carbon (58.1 sr); 7 - salt+dust+sulfate (47.2 sr); 8 - salt+carbon (49.1 sr); 9 - salt+sulfate (47.9 sr); 10 - dust (42.5 sr); 11 - salt+dust+carbon (48.2 sr); 12 - dust+sulfate (56.5 sr); 13 - salt+carbon+sulfate (53.3 sr); 14 - dust+carbon+sulfate (58.9 sr); 15 - all (52.3 sr) flag_values flag_meanings 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 none sul_c_67.5_sr c_62.0_sr salt_dust_32.5_sr salt_28.5_sr sul_60.0_sr dust_c_58.1_sr salt_dust_sul_47.2_sr salt_c_49.1_sr salt_sul_47.9_sr dust_42.5_sr salt_dust_c_48.2_sr dust_sul_56.5_sr salt_c_sul_53.3_sr dust_c_sul_58.9_sr all_52.3_sr	Rel 33 GLAS Binary Data	DS_UTCTime_4s
i_pbl4_qf	INTEGER_1 (UNLIMITED)	PBL optical depth flag for 532 nm (NOT_SET)	NOT_SET	Quality Flag Values: 0 = 0-5 % Error; 1 = 5-10 % Error; 2 = 10-15 % Error; 3 = 15-20 % Error; 4 = 20-25 % Error; 5 = 25-30 % Error; 6 = 30-35 % Error; 7 = 35-40 % Error; 8 = 40-45 % Error; 9 = 45-50 % Error; 10 = 50-55 % Error; 11 = 55-60 % Error; 12 = 60-65 % Error; 13 = 65-70 % Error; 14 = 70 and greater % Error; 15 = Unable to process flag_values flag_meanings 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 0-5_pcnt_err 5-10_pcnt_err 10-15_pcnt_err 15-20_pcnt_err 20-25_pcnt_err 25-30_pcnt_err 30-35_pcnt_err 35-40_pcnt_err 40-45_pcnt_err 45-50_pcnt_err 50-55_pcnt_err 55-60_pcnt_err 60-65_pcnt_err 65-70_pcnt_err 70_and_greater_pcnt_err no_proc	Rel 33 GLAS Binary Data	DS_UTCTime_4s
i_aer4_uf	INTEGER_1 (UNLIMITED, 8)	Aerosol optical depth use flag for 532 nm (NOT_SET)	NOT_SET	Aerosol Optical Depth Use Flag. The layers shown are ordered as follows. Layers 5-1 are the for the elevated aerosol layers below 20 km, with 5 the lowest and 1 the highest in altitude. Layers 8-6 are for the elevated aerosol layers above 20 km, with 6 the lowest and 8 the highest in altitude. For example if there were two elevated aerosol layers detected which were below 20 km, then the flags would be set for layers 5 and 4. In this case layer 4 is the highest elevated aerosol layer found. The Use flag meanings are different for the tropospheric (below 20 km) and the stratospheric (above 20 km) layers. Use Flag Meaning for tropospheric layers: 0 - none (use your default Sa); 1 - sulfate+carbon (67.5 sr); 2 - carbon (62.0 sr); 3 - salt+dust (32.5 sr); 4 - salt (28.5 sr); 5 - sulfate (60.0 sr); 6 - dust+carbon (58.1 sr); 7 - salt+dust+sulfate (47.2 sr); 8 - salt+carbon (49.1 sr); 9 - salt+sulfate (47.9 sr); 10 - dust (42.5 sr); 11 - salt+dust+carbon (48.2 sr); 12 - dust+sulfate (56.5 sr); 13 - salt+carbon+sulfate (53.3 sr); 14 - dust+carbon+sulfate (58.9 sr); 15 - all (52.3 sr). Use Flag Meanings for stratospheric layers: 12 - Stratospheric aerosol(non PSC layer whose top is > tropopause); 13 - PSC Type I; 14 - PSC Type II; 15 - Invalid	Rel 33 GLAS Binary Data	DS_UTCTime_4s
i_aer4_qf	INTEGER_1 (UNLIMITED, 8)	Aerosol optical depth quality flag for 532 nm (NOT_SET)	NOT_SET	Aerosol Optical Depth Quality Flag. The layers shown are ordered as follows. Layers 5-1 are the for the elevated aerosol layers below 20 km, with 5 the lowest and 1 the highest in altitude. Layers 8-6 are for the elevated aerosol layers above 20 km, with 6 the lowest and 8 the highest in altitude. For example if there were two elevated aerosol layers detected which were below 20 km, then the flags would be set for layers 5 and 4. In this case layer 4 is the highest elevated aerosol layer found. Quality Flag Values are the same for all layers: 0 = 0-5 % Error; 1 = 5-10 % Error; 2 = 10-15 % Error; 3 = 15-20 % Error; 4 = 20-25 % Error; 5 = 25-30 % Error; 6 = 30-35 % Error; 7 = 35-40 % Error; 8 = 40-45 % Error; 9 = 45-50 % Error; 10 = 50-55 % Error; 11 = 55-60 % Error; 12 = 60-65 % Error; 13 = 65-70 % Error; 14 = 70 and greater % Error; 15 = Unable to calculate error	Rel 33 GLAS Binary Data	DS_UTCTime_4s
i_aer4_sval_uf	INTEGER_1 (UNLIMITED, 9)	Aerosol true S Values use flag (NOT_SET)	NOT_SET	Aerosol true S values use flag for 9 layers at 1 per 4 sec. Stipulates which extinction to backscatter ratio was used in processing (1=default, 2=calculated and 15 denotes no layer detected (invalid) ). flag_values flag_meanings 1, 2, 15 default calculated no_layer_detected	Rel 33 GLAS Binary Data	DS_UTCTime_4s

Group: Data_4s/Aerosol1064_OD

This group contains the 1064 aerosol Optical Depth parameters

Label	Datatype (Dimensions)	long_name (standard_name)	units	description	source	coordinates
r_Aer_ir_bot	REAL (UNLIMITED, 2)	Elevation of Bottom of Aerosol Layers Detected in 1064 nm (NOT_SET)	meters	Elevation of Bottom of Aerosol Layers Detected in 1064 nm.	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_ir_top	REAL (UNLIMITED, 2)	Elevation of Top of Aerosol Layers Detected in 1064 nm (NOT_SET)	meters	Elevation of Top of Aerosol Layers detected in 1064 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_ir_bot_pres	REAL (UNLIMITED, 2)	Pressure of Bottom of Aerosol Layers Detected in 1064 nm (NOT_SET)	hPa	Pressure of Bottom of Aerosol Layers Detected in 1064 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_ir_bot_relh	REAL (UNLIMITED, 2)	Relative Humidity of Bottom of Aerosol Layers Detected in 1064 nm (NOT_SET)	percent	Relative Humidity of Bottom of Aerosol Layers Detected in 1064 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_ir_bot_temp	REAL (UNLIMITED, 2)	Temperature of Bottom of Aerosol Layers Detected in 1064 nm (NOT_SET)	degree Celsius	Temperature of Bottom of Aerosol Layers Detected in 1064 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_ir_top_pres	REAL (UNLIMITED, 2)	Pressure of Top of Aerosol Layers Detected in 1064 nm (NOT_SET)	hPa	Pressure of Top of Aerosol Layers Detected in 1064 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_ir_top_relh	REAL (UNLIMITED, 2)	Relative Humidity of Top of Aerosol Layers Detected in 1064 nm (NOT_SET)	percent	Relative Humidity of Top of Aerosol Layers Detected in 1064 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_ir_top_temp	REAL (UNLIMITED, 2)	Temperature of Top of Aerosol Layers Detected in 1064 nm (NOT_SET)	degree Celsius	Temperature of Top of Aerosol Layers Detected in 1064 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s
r_Aer_ir_OD	REAL (UNLIMITED, 2)	Aerosol Optical Depth at 1064 nm (NOT_SET)	NOT_SET	Aerosol Optical Depth at 1064 nm	Rel 33 GLAS Binary Data	DS_UTCTime_4s

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_Cloud_Layer_10	INTEGER (UNLIMITED)	Cloud Layer Index (NOT_SET)	NOT_SET	This array contains the cloud layer index, up to 10	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)	i4b (i_rec_ndx)	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

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)	Profile Location, Latitude (at each time) (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)	Profile Location, Longitude(at each time) (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/RangeDelay

This group contains information relating to the atomsphere range delay

Label	Datatype (Dimensions)	long_name (standard_name)	units	description	source	coordinates
r_erd	REAL (UNLIMITED)	Estimated Range Delay (NOT_SET)	millimeters	The estimated range delay is an estimate of the effect of atmospheric multiple scattering on the measured range as deduced from the surface pulse. Tables were created using the Monte Carlo method which contain the range delay as a function of height of scatting layer, geometrical thickness, optical thickness and particle size. The i_erd is provided to the elevation process as a range correction and is reported as a negative number that can be added to the range to correct it. The computation of i_erd is restricted to those times when the 532 channel was working sufficiently well (L2A and first half of L2B (also possibly for night L3A and L3B)).	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_rdu	REAL (UNLIMITED)	Range Delay Uncertainty (NOT_SET)	millimeters	Estimated uncertainty value in the range delay distance.	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_pse	REAL (UNLIMITED)	Particle Size Estimate (NOT_SET)	microns	Particle size estimate used to calculate warning flag and range delay, 1 per second	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_bs_erd	REAL (UNLIMITED)	Blowing Snow Range Delay (NOT_SET)	millimeters	Estimated range delay due to blowing snow.	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_reflCor_atm	REAL (UNLIMITED)	Reflectivity Correction Factor For Atmospheric Effects (NOT_SET)	NOT_SET	This reflectance correction factor is calculated as 1 / e^(-2(tc+ta+tp+tm)), where tc is the cloud (column) integrated optical depth, ta is the aerosol (column) integrated optical depth, tp is the planetary boundary layer optical depth, and tm is the molecular optical depth. tm is a constant equal to -log(gd_T_RTatm)/2, where gd_T_RTatm = 0.98 is defined in const_elev_mod.f90 or read from ANC07-03. The reflectance has been corrected for waveform saturation. The reflectance correction factor is computed from the 532 nm channel and has been corrected for multiple scattering.	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_reflct_1064od_1hz_cor	REAL (UNLIMITED)	1 Hz 1064nm total column optical depth (NOT_SET)	NOT_SET	Total column 1064nm optical depth from surface reflectance corrected for multiple scattering.	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_reflct_pristine_1hz	REAL (UNLIMITED)	1064nm modeled surface reflectance (NOT_SET)	NOT_SET	Modeled (calculated) 1064nm surface reflectance from wind speed.	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_reflct_1064msf_1hz	REAL (UNLIMITED)	1 Hz 1064nm multiple scattering corr. factor (NOT_SET)	NOT_SET	Total column optical depth 1064nm multiple scattering correction factor.	Rel 33 GLAS Binary Data	DS_UTCTime_1
i_cld1_mswf	INTEGER_1 (UNLIMITED)	Cloud Multiple Scattering Warning Flag (NOT_SET)	NOT_SET	Cloud Multiple Scattering Warning Flag at 1 Hz for 4 sec. First 4 bits are for first second, last 4 bits are for 4th second. The multiple scattering warning flag (MSWF) is based on the total column optical depth (aerosol plus cloud) calculated in GLA11 using 532nm. It is intended as a way to quickly obtain information about the potential severity of multiple scattering with regards to the range-to-surface calculated by the altimetry processing software. It will be output on the GLA11 product for use by the altimetry group. The multiple scattering warning flag will have values ranging from 0-14, based on the total column optical depth. A warning flag value of 15 will signify 'invalid'. An invalid will be encoded if an optical depth in any of the layers in the 1-second column could not be calculated. This usually occurs in a very optically-thick cloud which extinguishes the signal. It could also occur if the extinction-to-backscatter ratio assignment is set too high, causing the transmission calculations in the lidar inversion to go out-of-range. flag_values flag_meanings 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 less_than_0.01 0.01-0.03 0.03-0.06 0.06-0.1 0.1-0.15 0.15-0.225 0.225-0.3 0.3-0.4 0.4-0.5 0.5-0.67 0.67-0.9 0.9-1.2 1.2-1.6 1.6-2 greater_than_2 invalid	Rel 33 GLAS Binary Data	DS_UTCTime_1
i_blow_snow_conf	INTEGER_1 (UNLIMITED)	Blowing Snow Confidence (NOT_SET)	NOT_SET	A number that indicates the degree of confidence that this is indeed blowing snow. Blowing snow confidence ranges from 0 - 15 and has the following meanings: 0: profile tested, but no blowing snow detected 1 - 5: Good blowing snow detection using the 1064 channel. 1 is lowest confidence that layer is blowing snow, 5 is highest confidence. 6: Layer suspected of being low cloud (such as fog), or seemingly too thick to be blowing snow (> 1.0 km thick) as determined from 1064 channel. 7 - 12: Good blowing snow detection using the 532 channel. 7 is lowest confidence that layer is blowing snow, 12 is highest confidence. 13: Layer suspected of being low cloud (such as fog), or seemingly too thick to be blowing snow (> 1.0 km thick) as determined from 532 channel. 14: Wind speed < 5 m/s or ground stroke not detected (the latter case indicating overlying thick cloud) 15: Signal not examined for blowing snow (could be because it is closer to the equator than plus or minus 60 degrees latitude, or not over sea ice or land) flag_values flag_meanings 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 no_b_s good_b_s_1064_1 good_b_s_1064_2 good_b_s_1064_3 good_b_s_1064_4 good_b_s_1064_5 suspctd_low_cl_1064 good_b_s_532_7 good_b_s_532_8 good_b_s_532_9 good_b_s_532_10 good_b_s_532_11 good_b_s_532_12 suspctd_low_cl_532 low_wind_sp_thick_cloud sig_not_exam	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_cld1_grd_det	REAL (UNLIMITED)	Medium Resolution Ground Detection at 532 nm (NOT_SET)	meters	Medium resolution processed ground height at 1hz, 1 per profile	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_Surface_pres	REAL (UNLIMITED)	Surface Pressure (surface_air_pressure)	hPa	Surface Pressure, 4 of 1-second intervals.	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_Surface_relh	REAL (UNLIMITED)	Surface Relative Humidity (relative_humidity)	percent	Surface Relative Humidity, 4 of 1-second intervals.	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_Surface_temp	REAL (UNLIMITED)	Surface Temperature (surface_temperature)	degree Celsius	Surface Temperature, 4 of 1-second intervals.	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_Surface_wdir	REAL (UNLIMITED)	Surface Wind Direction Azimuth from North (NOT_SET)	degrees	Surface wind direction azimuth from North, 4 of 1-second intervals. 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	Surface Wind Speed, 4 of 1-second intervals. 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

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

Group: Data_1HZ/Quality

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

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 on-board_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 orbit_degraded	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_problems 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 modeled_attitude_used possible_orbit_degradation	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_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_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

Group: Data_1HZ/Angle

This group contains beam pointing angle 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/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/OD532CloudLayer

This group contains the 1HZ medium resolution 532 Optical Depth parameters

Label	Datatype (Dimensions)	long_name (standard_name)	units	description	source	coordinates
r_cld1_bot	REAL (UNLIMITED, 10)	Medium Resolution Cloud Bottom at 532 nm (NOT_SET)	meters	Medium resolution cloud bottom heights for layers which were selected for optical processing at 1hz, 1 per layer, 10 layers	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_cld1_top	REAL (UNLIMITED, 10)	Medium Resolution Cloud Top at 532 nm (NOT_SET)	meters	Medium resolution cloud top heights for layers which were selected for optical processing at 1hz, 1 per layer, 10 layers	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_cld1_msf	REAL (UNLIMITED, 10)	Cloud Multiple Scattering Factor (NOT_SET)	NOT_SET	Cloud multiple scattering coefficient at 1 hz, 1 per layer up to 10 layers	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_cld1_od	REAL (UNLIMITED, 10)	Cloud Optical Depth at 532 nm (NOT_SET)	NOT_SET	532 nm cloud optical depth, corrected for multiple scattering, at 1hz, up 10 layers	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_MRg_cldbot_pres	REAL (UNLIMITED, 10)	Medium Resolution 532 nm Cloud Bottom Pressure (NOT_SET)	hPa	Medium Resolution 532 nm Cloud Bottom Pressure	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_MRg_cldbot_relh	REAL (UNLIMITED, 10)	Medium Resolution 532 nm Cloud Bottom Relative Humidity (NOT_SET)	percent	Medium Resolution 532 nm Cloud Bottom Relative Humidity	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_MRg_cldbot_temp	REAL (UNLIMITED, 10)	Medium Resolution 532 nm Cloud Bottom Temperature (NOT_SET)	degree Celsius	Medium Resolution 532 nm Cloud Bottom Temperature	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_MRg_cldtop_pres	REAL (UNLIMITED, 10)	Medium Resolution 532 nm Cloud Top Pressure (NOT_SET)	hPa	Medium Resolution 532 nm Cloud Top Pressure	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_MRg_cldtop_relh	REAL (UNLIMITED, 10)	Medium Resolution 532 nm Cloud Top Relative Humidity (NOT_SET)	percent	Medium Resolution 532 nm Cloud Top Relative Humidity	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_MRg_cldtop_temp	REAL (UNLIMITED, 10)	Medium Resolution 532 nm Cloud Top Temperature (NOT_SET)	degree Celsius	Medium Resolution 532 nm Cloud Top Temperature	Rel 33 GLAS Binary Data	DS_UTCTime_1
i_cld1_uf	INTEGER_1 (UNLIMITED, 10)	Cloud optical depth flag for 532 nm (NOT_SET)	NOT_SET	for extinction cross section and layer optical depth, the use flag designates layer type category as follows for clouds: {based on average cloud temperature, water cloud is warmer than -13 C} Use Flag Meaning: 00 = less than or equal to -75.0 C; 01 = -75.0 through -68.5; 02 = -68.5 through -62.0; 03 = -62.0 through -55.5; 04 = -55.5 through -49.0; 05 = -49.0 through -32.5; 06 = -32.5 through -26.0; 07 = -26.0 through -19.5; 08 = -19.5 through -13.0; 09 = -13.0 through -6.5; 10 = -6.5 through 0.0; 11 = 0.0 through 6.5; 12 = 6.5 through 13.0; 13 = 13.0 through 19.5; 14 = greater than 19.5 C; 15 = invalid flag_values flag_meanings 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 up_to_-75_C -75_to_-68.5 -68.5_to_-62 -62_to_-55.5 -55.5_to_-49 -49_to_-32.5 -32.5_to_-26 -26_to_-19.5 -19.5_to_-13 -13_to_-6.5 -6.5_to_0 0_to_6.5 6.5_to_13 13_to_19.5 greater_than_19.5_C invalid	Rel 33 GLAS Binary Data	DS_UTCTime_1
i_cld1_qf	INTEGER_1 (UNLIMITED, 10)	Cloud optical depth flag for 532 nm (NOT_SET)	NOT_SET	Quality Flag Values: 0 = 0-5 % Error; 1 = 5-10 % Error; 2 = 10-15 % Error; 3 = 15-20 % Error; 4 = 20-25 % Error; 5 = 25-30 % Error; 6 = 30-35 % Error; 7 = 35-40 % Error; 8 = 40-45 % Error; 9 = 45-50 % Error; 10 = 50-55 % Error; 11 = 55-60 % Error; 12 = 60-65 % Error; 13 = 65-70 % Error; 14 = 70 and greater % Error; 15 = Unable to calculate error flag_values flag_meanings 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 0-5_pcnt_err 5-10_pcnt_err 10-15_pcnt_err 15-20_pcnt_err 20-25_pcnt_err 25-30_pcnt_err 30-35_pcnt_err 35-40_pcnt_err 40-45_pcnt_err 45-50_pcnt_err 50-55_pcnt_err 55-60_pcnt_err 60-65_pcnt_err 65-70_pcnt_err 70_and_greater_pcnt_err no_calc	Rel 33 GLAS Binary Data	DS_UTCTime_1

Group: Data_1HZ/OD1064CloudLayers

This group contains the 1HZ medium resolution 1064 Optical Depth parameters

Label	Datatype (Dimensions)	long_name (standard_name)	units	description	source	coordinates
r_MRir_cld_bot	REAL (UNLIMITED, 10)	Elevation of Bottom of Cloud Layers Detected in 1064 nm at Medium Resolution (NOT_SET)	meters	Elevation of Bottom of Cloud Layers Detected in 1064 nm at Medium Resolution data rate.	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_MRir_cld_top	REAL (UNLIMITED, 10)	Elevation of Top of Cloud Layers Detected in 1064 nm at Medium Resolution (NOT_SET)	meters	Elevation of Top of Cloud Layers Detected in 1064 nm at Medium Resolution data rate.	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_MRir_cldbot_pres	REAL (UNLIMITED, 10)	Pressure of Bottom of Cloud Layers Detected in 1064 nm at Medium Resolution (NOT_SET)	hPa	Pressure of Bottom of Cloud Layers Detected in 1064 nm at Medium Resolution data rate.	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_MRir_cldbot_relh	REAL (UNLIMITED, 10)	Relative Humidity of Bottom of Cloud Layers Detected in 1064 nm at MR (NOT_SET)	percent	Relative Humidity of Bottom of Cloud Layers Detected in 1064 nm at Medium Resolution data rate.	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_MRir_cldbot_temp	REAL (UNLIMITED, 10)	Temperature of Bottom of Cloud Layers Detected in 1064 nm at Medium Resolution (NOT_SET)	degree Celsius	Temperature of Bottom of Cloud Layers Detected in 1064 nm at Medium Resolution data rate.	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_MRir_cldtop_pres	REAL (UNLIMITED, 10)	Pressure of Top of Cloud Layers Detected in 1064 nm at Medium Resolution (NOT_SET)	hPa	Pressure of Top of Cloud Layers Detected in 1064 nm at Medium Resolution data rate.	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_MRir_cldtop_relh	REAL (UNLIMITED, 10)	Relative Humidity of Top of Cloud Layers in 1064 nm at Medium Resolution (NOT_SET)	percent	Relative Humidity of Top of Cloud Layers in 1064 nm at Medium Resolution data rate.	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_MRir_cldtop_temp	REAL (UNLIMITED, 10)	Temperature of Top of Cloud Layers Detected in 1064 nm at Medium Resolution (NOT_SET)	degree Celsius	Temperature of Top of Cloud Layers Detected in 1064 nm at Medium Resolution data rate.	Rel 33 GLAS Binary Data	DS_UTCTime_1
i_MRCir_af	INTEGER_1 (UNLIMITED)	Medium Resolution 1064 nm Cloud Layer QA Flag (NOT_SET)	NOT_SET	Availability flag. It provides the number of cloud layers determined from the 1064 nm data. value 0 = layers searched for but not detected; value 15 = cloud layers not searched for. flag_values flag_meanings 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 not_detected found_1 found_2 found_3 found_4 found_5 found_6 found_7 found_8 found_9 found_10 found_11 found_12 found_13 found_14 not_searched_for	Rel 33 GLAS Binary Data	DS_UTCTime_1
i_MRir_QAFlag	INTEGER_1 (UNLIMITED, 10)	Medium Resolution 1064 nm Cloud Layer QA Flag (NOT_SET)	NOT_SET	Quality flag: value 15 = cloud layers were not searched for; value 0 = cloud layers were searched for but not detected; values 1-14 indicate increasing confidence of good cloud retrieval (value 1 = least confidence, value 14 = greatest confidence). flag_values flag_meanings 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 not_detected confidence_1 confidence_2 confidence_3 confidence_4 confidence_5 confidence_6 confidence_7 confidence_8 confidence_9 confidence_10 confidence_11 confidence_12 confidence_13 confidence_14 not_searched_for	Rel 33 GLAS Binary Data	DS_UTCTime_1
r_cld_ir_OD	REAL (UNLIMITED, 10)	Cloud Optical Depth at 1064 nm (NOT_SET)	NOT_SET	Cloud Optical Depth at 1064 nm	Rel 33 GLAS Binary Data	DS_UTCTime_1

Group: /Data_40HZ/

This group contain data with a rate of 40HZ. 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_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

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)	Spot 1 Coordinate Data, Latitude Corrected (latitude)	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)	Spot 1 Coordinate Data, Longitude Corrected (longitude)	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/OpticalDepth

This group contains the optical depth-related parameters

Label	Datatype (Dimensions)	long_name (standard_name)	units	description	source	coordinates
r_reflct_1064od_40hz_cor	REAL (UNLIMITED)	40 Hz 1064nm total column od (NOT_SET)	NOT_SET	Total column 1064nm optical depth from surface reflectance corrected for multiple scattering.	Rel 33 GLAS Binary Data	DS_UTCTime_40
r_reflct_1064msf_40hz	REAL (UNLIMITED)	40 Hz 1064nm multiple scattering corr. factor (NOT_SET)	NOT_SET	Total column Optical Depth 1064nm multiple scattering correction factor.	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, 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=gla11_test.ctl

/METADATA/COLLECTIONMETADATA

Attribute	Example Value
DLLName	libDsESDTGlGLASPoly.001Sh.so
GranuleTimeDuration	81280
SpatialSearchType	Orbit
DataFileFormat	HDF5
ScienceMimeType	application/x-hdfeos
BrowseMimeType	application/x-hdfeos
BrowseOnlineMimeType	image/jpeg
ShortName	GLAH11
LongName	GLAS/ICESat L2 Global Thin Cloud/Aerosol Optical Depths Data (HDF5)
CollectionDescription	The level 2 thin cloud/aerosol data contains optical depths for clouds for up to 10 layers, the planetary boundary layer, and aerosols for up to 8 layers. Data granules will contain approximately 23 hours (14 orbits) of data.
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
Track	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_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/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/DATA204

/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	Granule contains fourteen orbits of data; nominally 24-hr period.

/METADATA/COLLECTIONMETADATA/CollectionAssociation

Attribute	Example Value
GLA00	CollectionAssociationContainer
GLAH02	CollectionAssociationContainer
GLAH07	CollectionAssociationContainer
GLAH09	CollectionAssociationContainer
GLAH08	CollectionAssociationContainer
GLAH10	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	Science Associated
CollectionUse	Level 1A atmospheric data product file containing: normalized lidar signals.
ShortName	GLAH02
VersionID	33

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH07

Attribute	Example Value
CollectionType	Input
CollectionUse	Level 1B file containing: calibrated backscatter profiles.
ShortName	GLAH07
VersionID	33

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH08

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

/METADATA/COLLECTIONMETADATA/CollectionAssociation/GLAH10

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

/METADATA/COLLECTIONMETADATA/DisciplineTopicParameters/Atmosphere

Attribute	Example Value
ECSDisciplineKeyword	Earth Science
ECSTopicKeyword	Atmosphere
ECSTermKeyword	Aerosols
ECSVariableKeyword	Aerosol Optical Depth/Thickness

/METADATA/COLLECTIONMETADATA/ECSCollection

Attribute	Example Value
RevisionDate	2012-06-25
SuggestedUsage	The purpose of GLAH11 is to provide the thin cloud/aerosol optical depth data to researchers. Cloud data are provided at 1Hz and aerosol data are provided at .25Hz. Each GLAH11 file was created from an equivalent GLA11 binary file. The data used to create the GLAH11 values are contained in the equivalent GLAHxx files for the GLAxx files. See the provenance metadata for the creation of the GLA11.
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	2

/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 1.1
ShortName	GLAH11
VersionID	33
RangeBeginningTime	01:51:38
RangeEndingTime	00:24:45
RangeBeginningDate	2003-11-18
RangeEndingDate	2003-11-19

/METADATA/INVENTORYMETADATA/ECSDataGranule

Attribute	Example Value
ReprocessingPlanned	no further update anticipated
ReprocessingActual	reprocessed
LocalGranuleID	GLAH11_633_2103_002_0407_0_01_0001.H5
ProductionDateTime	2013-02-08T12:02:51
LocalVersionID	33

/METADATA/INVENTORYMETADATA/InputGranule

Attribute	Example Value
InputPointer	gla11_test.ctl, tai-utc.dat, GLA11_633_2103_002_0407_0_01_0001.P0310, DsESDTGlGLAH11.033.desc

/METADATA/INVENTORYMETADATA/MeasuredParameter

Attribute	Example Value
ParameterName	Cloud_Optical_Depth, Aerosol_Optical_Depth, Planetary_Boundary_Layer_Optical_Depth

/METADATA/INVENTORYMETADATA/OrbitCalculatedSpatialDomain

Attribute	Example Value
OrbitNumber	4604, 4605, 4606, 4607, 4608, 4609, 4610, 4611, 4612, 4613, 4614, 4615, 4616, 4617, 4618
StartOrbitNumber	4604
StopOrbitNumber	4618
EquatorCrossingLongitude	-103.22287, -127.41792, -151.61336, -175.8089, 159.99582, 135.80128, 111.6064, 87.41001, 63.21418, 39.01927, 14.825027, -9.368591, -33.562866, -57.758118, -81.95212
EquatorCrossingTime	01:38:10, 03:14:50, 04:51:29, 06:28:07, 08:04:46, 09:41:25, 11:18:05, 12:54:44, 14:31:22, 16:08:02, 17:44:42, 19:21:21, 20:58:00, 22:34:38, 00:11:17
EquatorCrossingDate	2003-11-18, 2003-11-18, 2003-11-18, 2003-11-18, 2003-11-18, 2003-11-18, 2003-11-18, 2003-11-18, 2003-11-18, 2003-11-18, 2003-11-18, 2003-11-18, 2003-11-18, 2003-11-18, 2003-11-19

/METADATA/INVENTORYMETADATA/ProductSpecificMetadata

Attribute	Example Value
PercentGroundHit	0
Track	407, 408, 409, 410, 411, 412, 413, 414, 415, 416, 417, 418, 419, 420, 421
Instrument_State	373338
ReferenceOrbit	1
SP_ICE_PATH_NO	3429, 3430, 3431, 3432, 3433, 3434, 3435, 3436, 3437, 3438, 3439, 3440, 3441, 3442, 3443
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/DATA204
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	2
Version	6.0.1
Description	This process is an instantiation of the GLAS Science Algorithm Software (GSAS) 2 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, GLA02_033_2103_002_0411_0_02_0001.DAT, GLA02_033_2103_002_0413_0_02_0001.DAT, GLA02_033_2103_002_0415_0_02_0001.DAT, GLA02_033_2103_002_0417_0_02_0001.DAT, GLA02_033_2103_002_0419_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, GLA05_633_2103_002_0409_2_01_0001.DAT, GLA05_633_2103_002_0409_3_01_0001.DAT, GLA05_633_2103_002_0409_4_01_0001.DAT, GLA05_633_2103_002_0410_1_01_0001.DAT, GLA05_633_2103_002_0410_2_01_0001.DAT, GLA05_633_2103_002_0410_3_01_0001.DAT, GLA05_633_2103_002_0410_4_01_0001.DAT, GLA05_633_2103_002_0411_1_01_0001.DAT, GLA05_633_2103_002_0411_2_01_0001.DAT, GLA05_633_2103_002_0411_3_01_0001.DAT, GLA05_633_2103_002_0411_4_01_0001.DAT, GLA05_633_2103_002_0412_1_01_0001.DAT, GLA05_633_2103_002_0412_2_01_0001.DAT, GLA05_633_2103_002_0412_3_01_0001.DAT, GLA05_633_2103_002_0412_4_01_0001.DAT, GLA05_633_2103_002_0413_1_01_0001.DAT, GLA05_633_2103_002_0413_2_01_0001.DAT, GLA05_633_2103_002_0413_3_01_0001.DAT, GLA05_633_2103_002_0413_4_01_0001.DAT, GLA05_633_2103_002_0414_1_01_0001.DAT, GLA05_633_2103_002_0414_2_01_0001.DAT, GLA05_633_2103_002_0414_3_01_0001.DAT, GLA05_633_2103_002_0414_4_01_0001.DAT, GLA05_633_2103_002_0415_1_01_0001.DAT, GLA05_633_2103_002_0415_2_01_0001.DAT, GLA05_633_2103_002_0415_3_01_0001.DAT, GLA05_633_2103_002_0415_4_01_0001.DAT, GLA05_633_2103_002_0416_1_01_0001.DAT, GLA05_633_2103_002_0416_2_01_0001.DAT, GLA05_633_2103_002_0416_3_01_0001.DAT, GLA05_633_2103_002_0416_4_01_0001.DAT, GLA05_633_2103_002_0417_1_01_0001.DAT, GLA05_633_2103_002_0417_2_01_0001.DAT, GLA05_633_2103_002_0417_3_01_0001.DAT, GLA05_633_2103_002_0417_4_01_0001.DAT, GLA05_633_2103_002_0418_1_01_0001.DAT, GLA05_633_2103_002_0418_2_01_0001.DAT, GLA05_633_2103_002_0418_3_01_0001.DAT, GLA05_633_2103_002_0418_4_01_0001.DAT, GLA05_633_2103_002_0419_1_01_0001.DAT, GLA05_633_2103_002_0419_2_01_0001.DAT, GLA05_633_2103_002_0419_3_01_0001.DAT, GLA05_633_2103_002_0419_4_01_0001.DAT, GLA05_633_2103_002_0420_1_01_0001.DAT, GLA05_633_2103_002_0420_2_01_0001.DAT, GLA05_633_2103_002_0420_3_01_0001.DAT, GLA05_633_2103_002_0420_4_01_0001.DAT, ANC01_006_20031117_180000_01_0000.DAT, ANC01_006_20031118_000000_01_0000.DAT, ANC01_006_20031118_060000_01_0000.DAT, ANC01_006_20031118_120000_01_0000.DAT, ANC01_006_20031118_180000_01_0000.DAT, ANC01_006_20031119_000000_01_0000.DAT, ANC01_006_20031117_180000_01_0002.DAT, ANC01_006_20031118_000000_01_0002.DAT, ANC01_006_20031118_060000_01_0002.DAT, ANC01_006_20031118_120000_01_0002.DAT, ANC01_006_20031118_180000_01_0002.DAT, ANC01_006_20031119_000000_01_0002.DAT, ANC01_006_20031117_180000_01_0003.DAT, ANC01_006_20031118_000000_01_0003.DAT, ANC01_006_20031118_060000_01_0003.DAT, ANC01_006_20031118_120000_01_0003.DAT, ANC01_006_20031118_180000_01_0003.DAT, ANC01_006_20031119_000000_01_0003.DAT, ANC01_006_20031117_180000_01_0004.DAT, ANC01_006_20031118_000000_01_0004.DAT, ANC01_006_20031118_060000_01_0004.DAT, ANC01_006_20031118_120000_01_0004.DAT, ANC01_006_20031118_180000_01_0004.DAT, ANC01_006_20031119_000000_01_0004.DAT, ANC01_006_20031117_180000_01_0001.DAT, ANC01_006_20031118_000000_01_0001.DAT, ANC01_006_20031118_060000_01_0001.DAT, ANC01_006_20031118_120000_01_0001.DAT, ANC01_006_20031118_180000_01_0001.DAT, ANC01_006_20031119_000000_01_0001.DAT, ANC01_006_20031117_180000_01_0005.DAT, ANC01_006_20031118_000000_01_0005.DAT, ANC01_006_20031118_060000_01_0005.DAT, ANC01_006_20031118_120000_01_0005.DAT, ANC01_006_20031118_180000_01_0005.DAT, ANC01_006_20031119_000000_01_0005.DAT, ANC01_006_20031117_180000_01_0006.DAT, ANC01_006_20031118_000000_01_0006.DAT, ANC01_006_20031118_060000_01_0006.DAT, ANC01_006_20031118_120000_01_0006.DAT, ANC01_006_20031118_180000_01_0006.DAT, ANC01_006_20031119_000000_01_0006.DAT,
Type	GLA02, GLA02, GLA02, GLA02, GLA02, GLA02, GLA02, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, GLA05, 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, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC01, ANC04, ANC04, anc07, anc07, anc07, anc07, anc07, anc07, anc07, ANC08, ANC08, ANC09, ANC09, anc12, anc12, anc13, anc18, anc25, anc27, anc27, anc30, anc31, ANC33, anc35, ANC36, ANC36, ANC36, ANC36, ANC36, 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, 033, 033, 033, 033, 033, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 633, 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, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 006, 007, 007, 033, 033, 033, 033, 033, 033, 033, 015, 015, 076, 076, 004, 004, 006, 001, 005, 001, 001, 004, 004, 001, 001, 033, 033, 033, 033, 033, 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	GLA11_633_2103_002_0407_0_01_0001.DAT
Type	GLA11
Version	633

/METADATA/PROVENANCE/STEP_2

Attribute	Example Value
ProcessDateTime	2013-02-08T12:02:51.000000Z

/METADATA/PROVENANCE/STEP_2/ProcessAgent

Attribute	Example Value
Name	GLA11_h5_convert
Type	Data_Reformat
Version	Version 1.1 (February 2013)
Description	GLA11 Conversion PGE

/METADATA/PROVENANCE/STEP_2/ProcessInput

Attribute	Example Value
Name	./gla11_test.ctl, ../../data/tai-utc.dat, in/GLA11_633_2103_002_0407_0_01_0001.P0310, ../../glas_hdf/data/esdts/DsESDTGlGLAH11.033.desc
Type	IN_CNTL, IN_ANC_TAIUTC, IN_GLA11, IN_ESDT
Version	0, 0, 1, 1

/METADATA/PROVENANCE/STEP_2/ProcessOutput

Attribute	Example Value
Name	out/GLAH11_633_2103_002_0407_0_01_0001.H5
Type	OUT_GLAH11
Version	1
UUID	599740C3-F062-4F49-A756-8A0DA37BC95B
DOI	10.5067/ICESAT/GLAS/DATA204