GLAS/ICESat L1A Global Laser Pointing Data  View Catalog Page Entry ID
GLA04
Summary
The Geoscience Laser Altimeter System (GLAS) instrument on the Ice, Cloud, and Land Elevation Satellite (ICESat) provides global measurements of polar ice sheet elevation to discern changes in ice volume (mass balance) over time. Secondary objectives of GLAS are to measure sea ice roughness and thickness, cloud and atmospheric properties, land topography, vegetation canopy heights, ocean surface topography, and surface reflectivity.
GLAS has a 1064 nm laser channel for surface altimetry and dense cloud heights, and a 532 nm lidar channel for the vertical distribution of clouds and aerosols.
Level-1A global laser pointing data (GLA04) contain two orbits of attitude data from the spacecraft star tracker, instrument star tracker, gyro, and laser reference system, and other spacecraft attitude data required to calculate precise laser pointing. Data are in scaled integer binary format, big-endian (Unix) byte order, and are available via FTP.
Geographic Coverage
Spatial Coordinates:
N: 86°
S: -86°
E: 180°
W: -180°
Min Altitude: 593 km
Max Altitude: 623 km
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Data Set Citation
Dataset Creator: H.J. Zwally, R. Schutz, J. Abshire
Dataset Title: GLAS/ICESat L1A Global Laser Pointing Data
Dataset Release Date: 2003-01-01
Dataset Release Place: Boulder, CO U.S.A.
Dataset Publisher: National Snow and Ice Data Center (NSIDC)
Version: 18
Online Resource: http://nsidc.org/data/gla04.html
Temporal Coverage
Start Date: 2003-02-20
Data Resolution
Temporal Resolution: 6 hours
Location Keywords
- Geographic Region Global
Science Keywords
- Spectral/Engineering Platform Characteristics Attitude Characteristics
- Spectral/Engineering Platform Characteristics Viewing Geometry
Ancillary Keywords
- DAAC
- EOSDIS
- GLA04
- GLAS
- HRG Gyro
- ICESat
- Instrument Star Tracker
- ISIPS
- Laser Reference System
- NASA
- NSIDC
- Spacecraft Star Tracker
Platform
- ICESAT Ice, Cloud and Land Elevation Satellite
- SATELLITES
Instrument
- ALTIMETERS
- GLAS Geoscience Laser Altimeter System
- LIDAR Light Detection and Ranging
Project
- ICESAT Ice, Cloud and Land Elevation Satellite
Data Set Progress
IN WORK
Data Center
National Snow and Ice Data Center
Data Center URL: http://nsidc.org
Data Set ID: GLA041
Data Center Personnel
Name: NSIDC User Services
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc@nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA
NSIDC Distributed Active Archive Center
Data Center URL: http://nsidc.org/daac/index.html
Data Set ID: GLA04
Data Center Personnel
Name: NSIDC DAAC User Services
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc@nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA
Distribution
Distribution Media: FTP
Distribution Size: 2 MB to 386 MB
Distribution Format: binary
Personnel
David Hancock
Role: TECHNICAL CONTACT
Email: David.W.Hancock@nasa.gov
Contact Address:
ISIPS Manager
NASA Goddard Space Flight Center
Wallops Flight Facility
Wallops Island, VA
USA
H. Jay ZWALLY
Role: INVESTIGATOR
Phone: 301-614-5643
Fax: 301-614-5644
Email: Jay.Zwally@nasa.gov
Contact Address:
Laboratory for Hydrospheric Processes
NASA/Goddard Space Flight Center
Code 971
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA
Robert Schutz
Role: INVESTIGATOR
Contact Address:
GLAS Science Team Lead
University of Texas at Austin
Center for Space Research
City: Austin
Province or State: TX
Postal Code: 78712-1085
Country: USA
James Abshire
Role: INVESTIGATOR
Contact Address:
NASA/Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
NSIDC USER SERVICES
Role: TECHNICAL CONTACT
Phone: +1 (303) 492-6199
Fax: +1 (303) 492-2468
Email: nsidc@nsidc.org
Contact Address:
National Snow and Ice Data Center
CIRES, 449 UCB
University of Colorado
City: Boulder
Province or State: CO
Postal Code: 80309-0449
Country: USA
Related URL
VIEW PROJECT HOME PAGE
ICESat/GLAS web site at NSIDC
VIEW RELATED INFORMATION
ICESat/GLAS web site at University of Texas
VIEW RELATED INFORMATION
ICESat/GLAS web site at NASA Wallops Flight Facility
VIEW RELATED INFORMATION
ICESat/GLAS web site at NASA Goddard Space Flight Center
Reference
Bae, S. and B.E. Schutz. 2002. Precision attitude determination (PAD). GLAS algorithm theoretical basis document. Version 2.2. Austin, TX: Center for Space Research, University of Texas at Austin.
Center for Space Research. 'ICESat/GLAS.' January 2002. http://www.csr.utexas.edu/glas/.
Earth Science Data and Information System (ESDIS). 1996. EOS Ground System (EGS) Systems and Operations Concept. Greenbelt, MD: Goddard Space Flight Center.
Farrell, W.E. 1972. Deformation of the Earth by surface loads. Review of Geophysics and Space Physics 10: 761-797.
GLAS Science Team. 2000. Mission Operations Requirement Document (MORD) for the Ice, Cloud and Land Elevation Satellite (ICESat) Mission. Greenbelt, MD: Goddard Space Flight Center.
GLAS Science Team. 1997. GLAS Science Requirements. Version 2.01. Greenbelt, MD: Goddard Space Flight Center.
Heroux, D. 2000. Progress report on GLAS interface effort with ECS NOSE. Rev. 29 December 2000. Landover, MD: Emergent-IT/Raytheon. Herring, T.A. and K. Quinn. 1999. Atmospheric delay correction to GLAS laser altimeter ranges. GLAS algorithm theoretical basis document. Version 1.0. Lanham, MD: Science Systems and Applications, Inc.
Jester, P., and D. Hancock. 2002. The Algorithm Theoretical Basis Document for Level 1A Processing, Version 1.2. Wallops Island, VA: Raytheon ITSS.
Jester, P., and J. Lee. 2002. GLAS standard data products specification - level 1. Version 6.0. Wallops Island, VA: Raytheon ITSS.
Lee, J. 2002. GSAS user's guide: Version 4.0. Wallops Island, VA: Raytheon ITSS. McGarry, J.F., J. Abshire, X. Sun, J. Saba, A. Brenner, and D. Yi. 2002. GLAS flight science data selection algorithms for the altimeter (1064 nm), Version 4.15. Unpublished report.
Rim, H., and B. Schutz. 2002. Precision orbit determination. GLAS algorithm theoretical basis document. Version 2.2. Austin, TX: Center for Space Research, University of Texas at Austin.
Schutz, B. 2002. Laser footprint location (geolocation) and surface profiles. GLAS algorithm theoretical basis document. Version 3.0. Austin, TX: Center for Space Research, University of Texas at Austin.
Yi, D., J. Minster, and C. Bentley. 1999. Ocean tidal loading corrections. GLAS algorithm theoretical basis document. Version 1.0. Greenbelt, MD: Goddard Space Flight Center.
Zwally, H.J., B. Schutz, W. Abdalati, J. Abshire, C. Bentley, A. Brenner, J. Bufton, J. Dezio, D. Hancock, D. Harding, T. Herring, B. Minster, K. Quinn, S. Palm, J. Spinhirne, and R. Thomas. 2002. ICESAT's laser measurements of polar ice, atmosphere, ocean, and land. Journal of Geodynamics 34: 405-445.
Zwally, H.J., B. Schutz, D. Hancock, and A. Brenner. 2000. ICESat/GLAS Standard Data Products in HDF and SCF Formats. Version 1.2. Greenbelt, MD: Goddard Space Flight Center.
Metadata Name and Version
Metadata Name: CEOS IDN DIF
Metadata Version: 9.7
Creation and Review Dates
DIF Creation Date: 2002-10-28
Last DIF Revision Date: 2009-07-01
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