GCMD

Summary

Abstract: 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 atmospheric data (GLA02) include the normalized relative backscatter for the 532 nm and 1064 nm channels, and low-level instrument corrections such as laser energy (1064 nm and 532 nm), photon coincidence (532 nm), and detector gain correction (1064 nm). 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.

Data Set Citation

Dataset Originator/Creator: H.J. Zwally, R. Schutz, W. Hart, D. Hlavka, S. Palm, J. Spinhirne, E. Welton
Dataset Title: GLAS/ICESat L1A Global Atmosphere 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/gla02.html

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.

Data Center

NSIDC Distributed Active Archive Center [Information]
Data Center URL: http://nsidc.org/daac/index.html
Dataset ID: GLA021

Data Center Personnel
Name: NSIDC USER SERVICES Phone: +1 (303) 492-6199 Fax: +1 (303) 492-2468 Email: nsidc at 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

National Snow and Ice Data Center [Information]
Data Center URL: http://nsidc.org
Dataset ID: GLA02

Data Center Personnel
Name: NSIDC USER SERVICES Phone: +1 (303) 492-6199 Fax: +1 (303) 492-2468 Email: nsidc at 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: 671.61 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 at 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 at nasa.gov
Contact Address:
ISIPS Manager
NASA Goddard Space Flight Center
Wallops Flight Facility
USA
City: Wallops Island
Province or State: VA
Country: USA

H. JAY ZWALLY
Role: INVESTIGATOR
Phone: 301-614-5643
Fax: 301-614-5644
Email: Jay.Zwally at nasa.gov
Contact Address:
Laboratory for Hydrospheric Processes
NASA/Goddard Space Flight Center
Code 614
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

BOB E. SCHUTZ
Role: INVESTIGATOR
Phone: 512-471-1356
Fax: 512-471-3570
Email: schutz at utcsr.ae.utexas.edu
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

STEVE PALM
Role: INVESTIGATOR
Contact Address:
Science Systems and Applications, Inc.
City: Lanham
Province or State: MD
Postal Code: 20706
Country: USA

WILLIAM HART
Role: INVESTIGATOR
Phone: (301) 286-4936
Fax: (301) 286-1762
Email: billhart at virl.gsfc.nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Code 912.0
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

DENNIS HLAVKA
Role: INVESTIGATOR
Phone: (301) 286-1762
Phone: (301) 286-5578
Email: sgdlh at virl.gsfc.nasa.gov
Contact Address:
NASA/GSFC
Code 912
Room 366A, Building 22
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

JAMES D. SPINHIRNE
Role: INVESTIGATOR
Phone: 301-614-6274
Email: James.D.Spinhirne at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Mailstop 613.1
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA

ELLSWORTH WELTON
Role: INVESTIGATOR
Contact Address:
NASA/Goddard Space Flight Center
City: Greenbelt
Province or State: MD
Postal Code: 20770
Country: USA

Publications/References

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. 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. Guzzi, R., ed. 2003. Exploring the atmosphere by remote sensing techniques. Heidelberg, Germany: Springer-Verlag. 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 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. Palm, S., W. Hart, and D. Hlavka. 2002. GLAS atmospheric data products. GLAS algorithm theoretical basis document. Version 4.2. Lanham, MD: Science Systems and Applications, Inc. 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. Schutz, B. 2000. GLAS altimeter post-launch calibration/validation plan. Version 0.99. Austin, TX: Center for Space Research, University of Texas at Austin. Stephens, G.L. 1994. Remote sensing of the lower atmosphere: an introduction. New York: Oxford University Press. 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, 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.

Creation and Review Dates

DIF Creation Date: 2003-10-13
Last DIF Revision Date: 2011-02-11