GLA02 GLAS/ICESat L1A Global Atmosphere Data Zwally, H., R. Schutz, W. Hart, D. Hlavka, S. Palm, J. Spinhirne, and E. Welton. GLAS/ICESat L1A Global Atmosphere Data 2011-08-11 Boulder, Colorado USA NSIDC: National Snow and Ice Data Center 33 http://nsidc.org/data/gla02.html Technical Contact NSIDC User Services nsidc@nsidc.org 1 303 492-6199 x 1 303 492-2468 x

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

Boulder CO 80309-0449 USA Technical Contact David Hancock David.W.Hancock@nasa.gov

NASA Goddard Space Flight Center

ISIPS Manager

NASA Goddard Space Flight Center

Wallops Flight Facility

Wallops Island, VA

USA

Investigator H. Jay Zwally Jay.Zwally@nasa.gov 1 301 614-5643 1 301 614-5644

NASA/Goddard Space Flight Center

Laboratory for Hydrospheric Processes

NASA/Goddard Space Flight Center

Code 971

Greenbelt MD 20771 USA Investigator H. Jay Zwally Jay.Zwally@nasa.gov 1 301 614-5643 1 301 614-5644

NASA/Goddard Space Flight Center

Laboratory for Hydrospheric Processes

NASA/Goddard Space Flight Center

Code 971

Greenbelt MD 20771 USA Investigator Robert Schutz

University of Texas at Austin

Center for Space Research

GLAS Science Team Lead

University of Texas at Austin

Center for Space Research

Austin TX 78712-1085 USA Investigator Steve Palm

Science Systems and Applications, Inc.

Lanham MD Investigator William Hart

Science Systems and Applications, Inc.

Lanham MD Investigator Dennis Hlavka

Science Systems and Applications, Inc.

Lanham MD Investigator James Spinhirne

NASA/Goddard Space Flight Center

Greenbelt MD 20771 Investigator Ellsworth Welton

NASA/Goddard Space Flight Center

Greenbelt MD EARTH SCIENCE Spectral/Engineering Infrared Wavelengths Sensor Counts EARTH SCIENCE Spectral/Engineering Visible Wavelengths Sensor Counts Climatology/Meteorology/Atmosphere Backscatter DAAC EOSDIS GLA02 GLAS Global Positioning System GPS ICESat ISIPS Laser Return Energy Lidar Lidar Return Signal NASA NSIDC Orbit Number Precision Attitude Determination Precision Orbit Determination ALTIMETERS GLAS Geoscience Laser Altimeter System LIDAR Light Detection and Ranging ICESAT Ice, Cloud and Land Elevation Satellite SATELLITES 2003-02-20 2009-10-11 complete -86 86 -180 180 GEOGRAPHIC REGION GLOBAL ICESAT Ice, Cloud and Land Elevation Satellite 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. English NASA/GSFC/EOS/EO NSIDC_DAAC NASA DAAC at the National Snow and Ice Data Center http://nsidc.org/daac/index.html Data Center Contact NSIDC User Services nsidc@nsidc.org 1 303 492-6199 1 303 492-2468

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

Boulder CO 80309-0449 USA NSIDC National Snow and Ice Data Center http://nsidc.org Data Center Contact NSIDC User Services nsidc@nsidc.org 1 303 492-6199 1 303 492-2468

National Snow and Ice Data Center

CIRES, 449 UCB

University of Colorado

Boulder CO 80309-0449 USA FTP 671.61 MB Binary 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.

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.

VIEW PROJECT HOME PAGE http://nsidc.org/data/icesat/ ICESat/GLAS Data at NSIDC VIEW PROJECT HOME PAGE http://glas.wff.nasa.gov/ NASA Wallops ICESat/GLAS site VIEW PROJECT HOME PAGE http://icesat.gsfc.nasa.gov/ Official ICESat site VIEW PROJECT HOME PAGE http://www.csr.utexas.edu/glas/ University of Texas ICESat/GLAS site USA/NASA CEOS IDN DIF 9.7 2011-08-11 2013-03-06 Updated Version Summary and Citation authors.