Entry_ID: GLA07
Entry_Title: GLAS/ICESat L1B Global Backscatter Data
Group: Data_Set_Citation
   Dataset_Creator: Zwally, H., R. Schutz, W. Hart, D. Hlavka, and S. Palm. 
   Dataset_Title: GLAS/ICESat L1B Global Backscatter Data
   Dataset_Release_Date: 2011-08-11
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC DAAC: NASA DAAC at the National Snow and Ice Data Center
   Version: 33
   Online_Resource: http://nsidc.org/data/gla07.html
   Dataset DOI: http://dx.doi.org/10.5067/ICESAT/GLAS/DATA127
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: 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: Steve
   Last_Name: Palm
   Group: Contact_Address
      Address: Science Systems and Applications, Inc.
      Address: Science Systems and Applications, Inc.
      City: Lanham
      Province_or_State: MD
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: William
   Last_Name: Hart
   Group: Contact_Address
      Address: Science Systems and Applications, Inc.
      Address: Science Systems and Applications, Inc.
      City: Lanham
      Province_or_State: MD
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Dennis
   Last_Name: Hlavka
   Group: Contact_Address
      Address: Science Systems and Applications, Inc.
      Address: Science Systems and Applications, Inc.
      City: Lanham
      Province_or_State: MD
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: James
   Last_Name: Spinhirne
   Group: Contact_Address
      Address: NASA/Goddard Space Flight Center
      Address: NASA/Goddard Space Flight Center
      City: Greenbelt
      Province_or_State: MD
      Postal_Code: 20771
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Ellsworth
   Last_Name: Welton
   Group: Contact_Address
      Address: NASA/Goddard Space Flight Center
      Address: NASA/Goddard Space Flight Center
      City: Greenbelt
      Province_or_State: MD
   End_Group
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Aerosols
   Variable_Level_1: Aerosol Backscatter
   Detailed_Variable: Aerosol Backscatter Cross Section Profile
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Atmosphere
   Term: Atmospheric Radiation
   Variable_Level_1: Scattering
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Land Surface
   Term: Topography
   Variable_Level_1: Terrain Elevation
End_Group
ISO_Topic_Category: Climatology/Meteorology/Atmosphere
Keyword: Attenuated Backscatter Cross-section
Keyword: Backscatter
Keyword: DAAC
Keyword: EOSDIS
Keyword: GLA07
Keyword: GLAS
Keyword: Global Positioning System
Keyword: GPS
Keyword: ICESat
Keyword: ISIPS
Keyword: Laser Return Energy
Keyword: Lidar
Keyword: Lidar Backscatter
Keyword: Lidar Return Signal
Keyword: NASA
Keyword: NSIDC
Keyword: Orbit Number
Keyword: Precision Attitude Determination
Keyword: Precision Orbit Determination
Keyword: Range
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
End_Group
Group: Location
   Location_Category: GEOGRAPHIC REGION
   Location_Type: GLOBAL
End_Group
Project: ICESAT > Ice, Cloud and Land Elevation Satellite
Group: 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.

End_Group
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: 827 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.

   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.

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-1B global backscatter data (GLA07) are provided at full instrument 
   resolution. The product includes full 532 nm (41.1 to -1.0 km) and 1064 nm (20 
   to -1 km) calibrated attenuated backscatter profiles at 5 times per second, 
   and from 10 to -1 km, at 40 times per second for both channels. Also included 
   are calibration coefficient values and molecular backscatter profiles at once 
   per second. Data granules contain approximately 190 minutes (2 orbits) of data. 

   Each data granule has an associated browse product that users can quickly 
   peruse 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.

End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://nsidc.org/data/icesat/
   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: 2014-11-17
Group: DIF_Revision_History

   In Data Citation, changed Publisher to: NASA DAAC at the National Snow and Ice 
   Data Center.

End_Group