Entry_ID: GLA06
Entry_Title: GLAS/ICESat L1B Global Elevation Data
Group: Data_Set_Citation
   Dataset_Creator: Zwally, H., R. Schutz, C. Bentley, J. Bufton, T. Herring, J. Minster, J. Spinhirne, and R. Thomas. 
   Dataset_Title: GLAS/ICESat L1B Global Elevation Data
   Dataset_Release_Date: 2014-06-17
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC: National Snow and Ice Data Center
   Version: 34
   Online_Resource: http://nsidc.org/data/gla06.html
   Dataset DOI: http://dx.doi.org/10.5067/ICESAT/GLAS/DATA126
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: Charles
   Last_Name: Bentley
   Group: Contact_Address
      Address: University of Wisconsin
      Address: Dept. of Geology and Geophysics
      Address: Dept. of Geology and Geophysics
      Address: University of Wisconsin
      City: Madison
      Province_or_State: WI
      Postal_Code: 53706
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Jack
   Last_Name: Bufton
   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: Investigator
   First_Name: Thomas
   Last_Name: Herring
   Group: Contact_Address
      Address: Massachusetts Institute of Technology
      City: Cambridge
      Province_or_State: MA
      Postal_Code: 02139
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Jean-Bernard
   Last_Name: Minster
   Group: Contact_Address
      Address: Scripps Institute of Oceanography
      Address: University of California
      City: La Jolla
      Province_or_State: CA
      Postal_Code: 92093
   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: Robert
   Last_Name: Thomas
   Group: Contact_Address
      Address: Observational Sciences Branch, Wallops Flight Facility, Goddard Space Flight Center, NASA
      Address: EG&G
      Address: NASA Wallops Flight Facility
      City: Wallops Island
      Province_or_State: VA
      Postal_Code: 23337
   End_Group
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Glaciers/Ice Sheets
   Variable_Level_1: Glacier Elevation/Ice Sheet Elevation
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Glaciers/Ice Sheets
   Variable_Level_1: Glacier Topography/Ice Sheet Topography
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Glaciers/Ice Sheets
   Variable_Level_1: Ice Sheets
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Sea Ice
   Variable_Level_1: Ice Roughness
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Sea Ice
   Variable_Level_1: Reflectance
   Detailed_Variable: Laser Reflectance
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Land Surface
   Term: Surface Radiative Properties
   Variable_Level_1: Reflectance
   Detailed_Variable: Laser Reflectance
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Land Surface
   Term: Topography
   Variable_Level_1: Surface Roughness
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Land Surface
   Term: Topography
   Variable_Level_1: Terrain Elevation
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Oceans
   Term: Sea Ice
   Variable_Level_1: Ice Roughness
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Oceans
   Term: Sea Ice
   Variable_Level_1: Reflectance
   Detailed_Variable: Laser Reflectance
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Oceans
   Term: Sea Surface Topography
   Variable_Level_1: Sea Surface Height
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Oceans
   Term: Sea Surface Topography
   Variable_Level_1: Sea Surface Slope
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Terrestrial Hydrosphere
   Term: Glaciers/Ice Sheets
   Variable_Level_1: Glacier Elevation/Ice Sheet Elevation
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Terrestrial Hydrosphere
   Term: Glaciers/Ice Sheets
   Variable_Level_1: Glacier Topography/Ice Sheet Topography
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Terrestrial Hydrosphere
   Term: Glaciers/Ice Sheets
   Variable_Level_1: Ice Sheets
End_Group
ISO_Topic_Category: Elevation
Keyword: Altimetry
Keyword: Atmospheric Delay Correction
Keyword: Backscatter
Keyword: DAAC
Keyword: Dem
Keyword: EOSDIS
Keyword: GLA06
Keyword: GLAS
Keyword: Global Positioning System
Keyword: GPS
Keyword: ICESat
Keyword: ISIPS
Keyword: Laser Footprint
Keyword: Laser Pulse
Keyword: Lidar
Keyword: NASA
Keyword: Noise Level
Keyword: NSIDC
Keyword: Off-nadir Pointing Direction
Keyword: Orbit Number
Keyword: Precision Attitude Determination
Keyword: Precision Orbit Determination
Keyword: Range
Keyword: Received Energy
Keyword: Received Pulse Gain
Keyword: Signal Saturation
Keyword: Transmitted Energy
Keyword: Transmitted Gain
Keyword: Waveform
Keyword: Waveform Kurtosis
Keyword: Waveform Skewness
Sensor_Name: ALTIMETERS
Sensor_Name: GLAS > Geoscience Laser Altimeter System
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.      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.

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: 7 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.

   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.

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 elevation data (GLA06) include surface elevation, surface roughness 
   assuming no slope, surface slope assuming no roughness, and geodetic and 
   atmospheric corrections for range measurements. GLA06 is used in conjunction 
   with GLA05 to create the Level-2 altimetry products (GLA12-15)

   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.

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
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW RELATED INFORMATION
   End_Group
   URL: http://nsidc.org/data/dems/index.html
   Description: Polar Ice Sheet DEMs and Elevation Data
End_Group
IDN_Node: USA/NASA
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 2014-06-17
Last_DIF_Revision_Date: 2014-08-11
Group: DIF_Revision_History

   Removed Publication Date Update Text.  First release of R34 is a new release, 
   not an update.

End_Group