GLAS/ICESat L2 Sea Ice Altimetry Data  View Catalog Page Entry ID
GLA13
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.
This level-2 altimetry product (GLA13) provides surface elevations for sea ice. Data also include the laser footprint gelocation and reflectance, as well as geodetic, instrument, and atmospheric corrections for range measurements.
Each data granule has an associated browse product that users can quickly view to determine the general quality of the data in the granule. Browse products consist of image plots of key parameters and statistics. 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°
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Data Set Citation
Dataset Creator: Zwally, H.J., R. Schutz, C. Bentley, J. Bufton, T. Herring, J. Minster, J. Spinhirne, R. Thomas
Dataset Title: GLAS/ICESat L2 Sea Ice Altimetry Data
Dataset Release Date: 2003-01-01
Dataset Release Place: Boulder, CO, USA
Dataset Publisher: National Snow and Ice Data Center (NSIDC)
Version: 18
Online Resource: http://nsidc.org/data/gla13.html
Temporal Coverage
Start Date: 2003-02-20
Data Resolution
Temporal Resolution: 1/40 second full-rate data
Location Keywords
- Geographic Region Global
Science Keywords
- Cryosphere Sea Ice Ice Roughness
- Cryosphere Sea Ice Reflectance Laser Reflectance
- Cryosphere Sea Ice Sea Ice Elevation
- Oceans Sea Ice Ice Roughness
- Oceans Sea Ice Reflectance Laser Reflectance
- Oceans Sea Ice Sea Ice Elevation
Ancillary Keywords
- Atmospheric Delay Correction
- DAAC
- Dem
- EOSDIS
- GLA13
- GLAS
- ICESat
- ISIPS
- Laser Footprint
- Laser Pulse
- NASA
- Noise Level
- NSIDC
- Off-nadir Pointing Direction
- Peak Amplitude
- Range
- Received Energy
- Received Pulse Gain
- Sea Ice Surface Elevation
- Signal Saturation
- Transmitted Energy
- Transmitted Gain
- Waveform
- Waveform Kurtosis
- Waveform Peak
- Waveform Skewness
Platform
- ICESAT Ice, Cloud and Land Elevation Satellite
- SATELLITES
Instrument
- ALTIMETERS
- GLAS Geoscience Laser Altimeter System
Project
- ICESAT Ice, Cloud and Land Elevation Satellite
Quality
Browse products in PNG graphic format contain quality information; these are available along with corresponding data granules in the Data Pool or EOS Data Gateway. The i_FrameQF quality flag is set to '1' if there is a problem in calculating individual parameters, or the flag is set to '0' if there are no problems.
Data Set Progress
IN WORK
Data Center
National Snow and Ice Data Center
Data Center URL: http://nsidc.org
Data Set ID: GLA131
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: GLA131
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: 107 MB per granule
Distribution Format: scaled integer binary
Personnel
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
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
Charles Bentley
Role: INVESTIGATOR
Contact Address:
Dept. of Geology and Geophysics
University of Wisconsin
City: Madison
Province or State: WI
Postal Code: 53706
Jack Bufton
Role: INVESTIGATOR
Contact Address:
NASA/Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Thomas Herring
Role: INVESTIGATOR
Contact Address:
Massachusetts Institute of Technology
City: Cambridge
Province or State: MA
Postal Code: 02139
Jean-Bernard Minster
Role: INVESTIGATOR
Contact Address:
Scripps Institute of Oceanography
University of California
City: La Jolla
Province or State: CA
Postal Code: 92093
James Spinhirne
Role: INVESTIGATOR
Contact Address:
NASA/Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20771
Robert Thomas
Role: INVESTIGATOR
Contact Address:
EG&G
NASA Wallops Flight Facility
City: Wallops Island
Province or State: VA
Postal Code: 23337
Related URL
VIEW PROJECT HOME PAGE
Official ICESat web site
VIEW RELATED INFORMATION
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.
Brenner, A.C., C.R. Bentley, B.M. Csatho, D.J. Harding, M.A. Hofton, J. Minster, L. Roberts, J.L. Saba, R. Schutz, R.H. Thomas, D. Yi, and H.J. Zwally. 2000. Derivation of range and range distributions from laser pulse waveform analysis for surface elevations, roughness, slope, and vegetation heights. Algorithm theoretical basis document. Version 3.0. Greenbelt, MD: Goddard Space Flight Center.
Center for Space Research. 'ICESat/GLAS.' January 2002. http://www.csr.utexas.edu/glas/.
Davis C.H. and H.J. Zwally. 1993. Geographic and seasonal variations in the surface properties of the ice sheets by satellite radar altimetry. Journal of Glaciology 39:687-697.
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. 2000. GLAS altimeter post-launch calibration/validation plan. Version 0.99. 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.
Wahr, J., D. Wingham, and C. Bentley. 2000. A method of combining ICESat and GRACE satellite data to constrain Antarctic mass balance. Journal of Geophysical Research 105(B7):16,279-16,294.
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.
Zwally, H.J., R.A. Bindschadler, A.C. Brenner, T.V. Martin, and R.H. Thomas. 1983. Surface elevation contours of Greenland and Antarctic ice sheets. Journal of Geophysical Research 88(C3):1589-1596.
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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