This file contains polynomial coefficients that represent the corresponding transformation matrix quaternions.

The Precision Orbit Data (POD) file provides the time-referenced precision latitude, longitude, and altitude for the center of mass of the spacecraft. Data from this file are used to georeference the Level-1B GLAS standard data products, using a specially-tuned orbit interpolator. The contents of this file include:

• Time-ordered spacecraft Earth-fixed state vector, at 30-second intervals (sufficient for GLAS due to lower altitude of spacecraft)

• The date and time of each state vector

The Precision Attitude Data (PAD) file provides the off-nadir component of the laser measurement's footprint. The contents of this file include:

• Time-ordered pointing vectors (deviations from nadir) of the laser, in decimal degrees and direction, from the external laser pointing monitor on the spacecraft

• Uncertainties associated with the pointing vectors

Predicted orbit file from the Center for Space Research, University of Texas

GPS to J2000 UTC time conversion table. Contains leap seconds to add to GPS seconds which will be eventually be converted into UTC J2000 time.

This is a multi-file granule. Each file represents a different reference orbit (8-day, 91-day) with ephemeredes.

This file is delivered to ISIPS from the ISF.

• "d_shdr_count" is the counter value in the secondary header on most APIDS

• "d_shdr_count_prap" is the counter value in the secondary header of PRAP

• "d_utc" is the UTC time to which the counter values are converted

• "d_glas_osc_rate" is the GLAS oscillator rate

• "d_sc_osc_rate" is the Spacecraft oscillator rate

• "i_trkr_subject(1)" is the subject indicater for LRS tracker 0

• "i_trkr_subject(2)" is the subject indicater for LRS tracker 1

• "i_trkr_subject(3)" is the subject indicater for LRS tracker 2

• "d_implement_time" is the UTC time where the data are first valid

• "Implement_time" is the UTC time at which this conversion was valid. GLAS_L0proc uses the designated start time of an APID (which is specified in the control file entry) to find the correct position within the ANC33 file based on the Implement_time field.

Spacecraft center of gravity file, from the Center for Space Research, University of Texas.

Converted GPS file

ANC07 files are in standard GSAS "KEYWORD=VALUE" format. The keyword is not case sensitive. Spaces are allowed, but not required. Comment lines must be preceded by a "#" character. The keyword is limited to 25 characters; the value is limited to 229 characters. ANC07 files contain sections for errors messages, status messages, global constants, and subsystem-specific constants. Sections may be combined into a single file or separated into multiple files. Not all sections are present in each ANC07 file.

The Constants-Error file contains the following sections.

BEG_OF_STATUS=
...Status section contents...
END_OF_STATUS=
BEG_OF_ERROR=
...Error section contents...
END_OF_ERROR

ANC07 files are in a standard "KEYWORD=VALUE" format. The keyword is not case sensitive. Spaces are allowed, but not required. Comment lines must be preceded by a "#" character. The keyword is limited to 25 characters; the value is limited to 229 characters. ANC07 files contain sections for errors messages, status messages, global constants, and subsystem-specific constants. Sections may be combined into a single file or separated into multiple files. Not all sections are present in each ANC07 file.

The Constants-Globals file contains the following sections.

BEG_OF_GLOBALS=
...Global constants section contents...
END_OF_GLOBALS

ANC07 files are in standard GSAS "KEYWORD=VALUE" format. The keyword is not case sensitive. Spaces are allowed, but not required. Comment lines must be preceded by a "#" character. The keyword is limited to 25 characters; the value is limited to 229 characters. ANC07 files contain sections for errors messages, status messages, global constants, and subsystem-specific constants. Sections may be combined into a single file or separated into multiple files. Not all sections are present in each ANC07 file.

The Constants-Atm file contains the following sections.

BEG_OF_ATM=
...Atmosphere constants section contents...
END_OF_ATM

ANC07 files are in standard GSAS "KEYWORD=VALUE" format. The keyword is not case sensitive. Spaces are allowed, but not required. Comment lines must be preceded by a "#" character. The keyword is limited to 25 characters; the value is limited to 229 characters. ANC07 files contain sections for errors messages, status messages, global constants, and subsystem-specific constants. Sections may be combined into a single file or separated into multiple files. Not all sections are present in each ANC07 file.

The Constants-Elevation file contains the following sections.

BEG_OF_ELEV=
...Elevation constants section contents...
END_OF_ELEV

ANC07 files are in standard GSAS "KEYWORD=VALUE" format. The keyword is not case sensitive. Spaces are allowed, but not required. Comment lines must be preceded by a "#" character. The keyword is limited to 25 characters; the value is limited to 229 characters. ANC07 files contain sections for errors messages, status messages, global constants, and subsystem-specific constants. Sections may be combined into a single file or separated into multiple files. Not all sections are present in each ANC07 file.

The Constants-Waveforms file contains the following sections.

BEG_OF_WF=
...WF constants section contents...
END_OF_WF

ANC07 files are in standard GSAS "KEYWORD=VALUE" format. The keyword is not case sensitive. Spaces are allowed, but not required. Comment lines must be preceded by a "#" character. The keyword is limited to 25 characters; the value is limited to 229 characters. ANC07 files contain sections for errors messages, status messages, global constants, and subsystem-specific constants. Sections may be combined into a single file or separated into multiple files. Not all sections are present in each ANC07 file.

The Constants-L1A file contains the following sections.

BEG_OF_L1A=
...L1A constants section contents...
END_OF_L1A

ANC27 is a multi-file granule. 00=coarse regional mask, 01=fine regional mask. This granule provides the regional mask definitions used to determine what data goes on each elevation level-2 product at the 2-min x 2-min resolution. The coarse file contains the type of regions (ice sheet, sea ice, land, or ocean) contained at the 1° x 1° coarse resolution. If at the coarse resolution more than one region type is contained in that grid block, then a fine resolution block exists that defines each 2-min x 2-min block within the large block. More than one region type may exist in any block.