Entry_ID: GLA04
Entry_Title: GLAS/ICESat L1A Global Laser Pointing Data
Group: Data_Set_Citation
   Dataset_Creator: Zwally, H., R. Schutz, and J. Abshire. 
   Dataset_Title: GLAS/ICESat L1A Global Laser Pointing Data
   Dataset_Release_Date: 2011-08-11
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC: National Snow and Ice Data Center
   Version: 33
   Online_Resource: http://nsidc.org/data/gla04.html
   Dataset DOI: http://dx.doi.org/10.5067/ICESAT/GLAS/DATA124
End_Group
Group: Personnel
   Role: Technical Contact
   First_Name: David
   Last_Name: Hancock
   Email: David.W.Hancock@nasa.gov
   Group: Contact_Address
      Address: NASA Goddard Space Flight Center
      Address: ISIPS Manager
      Address: NASA Goddard Space Flight Center
      Address: Wallops Flight Facility
      Address: Wallops Island, VA
      Address: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: H. Jay
   Last_Name: Zwally
   Email: Jay.Zwally@nasa.gov
   Phone: 1 301 614-5643 
   Fax: 1 301  614-5644 
   Group: Contact_Address
      Address: NASA/Goddard Space Flight Center
      Address: Laboratory for Hydrospheric Processes
      Address: Laboratory for Hydrospheric Processes
      Address: NASA/Goddard Space Flight Center
      Address: Code 971
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: H. Jay
   Last_Name: Zwally
   Email: Jay.Zwally@nasa.gov
   Phone: 1 301 614-5643 
   Fax: 1 301  614-5644 
   Group: Contact_Address
      Address: NASA/Goddard Space Flight Center
      Address: Laboratory for Hydrospheric Processes
      Address: Laboratory for Hydrospheric Processes
      Address: NASA/Goddard Space Flight Center
      Address: Code 971
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Robert
   Last_Name: Schutz
   Group: Contact_Address
      Address: University of Texas at Austin
      Address: Center for Space Research
      Address: GLAS Science Team Lead
      Address: University of Texas at Austin
      Address: Center for Space Research
      City: Austin
      Province_or_State: TX
      Postal_Code: 78712-1085
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: James
   Last_Name: Abshire
   Group: Contact_Address
      Address: NASA/Goddard Space Flight Center
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
   End_Group
End_Group
Group: Personnel
   Role: Technical Contact
   First_Name: NSIDC
   Last_Name: User Services
   Email: nsidc@nsidc.org
   Phone: 1 303 492-6199 x
   Fax: 1 303  492-2468 x
   Group: Contact_Address
      Address: National Snow and Ice Data Center
      Address: CIRES, 449 UCB
      Address: University of Colorado
      City: Boulder
      Province_or_State: CO
      Postal_Code: 80309-0449
      Country: USA
   End_Group
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Spectral/Engineering
   Term: Platform Characteristics
   Variable_Level_1: Attitude Characteristics
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Spectral/Engineering
   Term: Platform Characteristics
   Variable_Level_1: Viewing Geometry
End_Group
ISO_Topic_Category: Geoscientific Information
Keyword: DAAC
Keyword: EOSDIS
Keyword: GLA04
Keyword: GLAS
Keyword: HRG Gyro
Keyword: ICESat
Keyword: Instrument Star Tracker
Keyword: ISIPS
Keyword: Laser Reference System
Keyword: NASA
Keyword: NSIDC
Keyword: Spacecraft Star Tracker
Sensor_Name: ALTIMETERS
Sensor_Name: GLAS > Geoscience Laser Altimeter System
Sensor_Name: LIDAR > Light Detection and Ranging
Source_Name: ICESAT > Ice, Cloud and Land Elevation Satellite
Source_Name: SATELLITES
Group: Temporal_Coverage
   Start_Date: 2003-02-20
   Stop_Date: 2009-10-11
End_Group
Data_Set_Progress: complete
Group: Spatial_Coverage
   Southernmost_Latitude: -86
   Northernmost_Latitude: 86
   Westernmost_Longitude: -180
   Easternmost_Longitude: 180
   Minimum_Altitude: 593 kilometers
   Maximum_Altitude: 623 kilometers
End_Group
Group: Location
   Location_Category: GEOGRAPHIC REGION
   Location_Type: GLOBAL
End_Group
Group: Data_Resolution
   Temporal_Resolution: 06:00:00
End_Group
Project: ICESAT > Ice, Cloud and Land Elevation Satellite
Data_Set_Language: English
Originating_Center: NASA/GSFC/EOS/EO
Group: Data_Center
   Data_Center_Name: NASA DAAC > NASA DAAC at the National Snow and Ice Data Center
   Data_Center_URL: http://nsidc.org/daac/index.html
   Group: Personnel
      Role: Data Center Contact
      First_Name: NSIDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 
      Fax: 1 303  492-2468 
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Data_Center
   Data_Center_Name: NSIDC > National Snow and Ice Data Center
   Data_Center_URL: http://nsidc.org
   Group: Personnel
      Role: Data Center Contact
      First_Name: NSIDC
      Last_Name: User Services
      Email: nsidc@nsidc.org
      Phone: 1 303 492-6199 
      Fax: 1 303  492-2468 
      Group: Contact_Address
         Address: National Snow and Ice Data Center
         Address: CIRES, 449 UCB
         Address: University of Colorado
         City: Boulder
         Province_or_State: CO
         Postal_Code: 80309-0449
         Country: USA
      End_Group
   End_Group
End_Group
Group: Distribution
   Distribution_Media: FTP
   Distribution_Size: 2 to 386 MB
   Distribution_Format: Binary
End_Group
Group: 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.

End_Group
Group: 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.

End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://nsidc.org/data/icesat/index.html
   Description: ICESat/GLAS Data at NSIDC
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://icesat.gsfc.nasa.gov/
   Description: ICESat/GLAS web site at NASA Goddard Space Flight Center
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://glas.wff.nasa.gov/
   Description: ICESat/GLAS web site at NASA Wallops Flight Facility
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://www.csr.utexas.edu/glas/
   Description: ICESat/GLAS web site at University of Texas
End_Group
IDN_Node: USA/NASA
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 2011-08-11
Last_DIF_Revision_Date: 2014-07-14
DIF_Revision_History: Added DOI.