Entry_ID: NSIDC-0156
Entry_Title: CLPX-Airborne: Airborne GPS Bistatic Radar
Group: Data_Set_Citation
   Dataset_Creator: Masters, D. 
   Dataset_Title: CLPX-Airborne: Airborne GPS Bistatic Radar
   Dataset_Release_Date: 2003-09-29
   Dataset_Release_Place: Boulder, Colorado USA
   Dataset_Publisher: NSIDC DAAC: NASA DAAC at the National Snow and Ice Data Center
   Online_Resource: http://nsidc.org/data/nsidc-0156.html
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Dallas
   Last_Name: Masters
   Phone: 1 303 492.4075 
   Fax: 1 303  492.2825 
   Group: Contact_Address
      Address: University of Colorado
      Address: University of Colorado
      Address: University of Colorado
      Address: CB 431/ CCAR
      City: Boulder
      Province_or_State: CO
      Postal_Code: 80309-0431
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Dallas
   Last_Name: Masters
   Phone: 1 303 492.4075 
   Fax: 1 303  492.2825 
   Group: Contact_Address
      Address: University of Colorado
      Address: University of Colorado
      Address: University of Colorado
      Address: CB 431/ CCAR
      City: Boulder
      Province_or_State: CO
      Postal_Code: 80309-0431
      Country: USA
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Valery
   Last_Name: Zavorotny
   Email: valery.zavorotny@noaa.gov
   Group: Contact_Address
      Address: NOAA Environmental Technology Laboratory
      Address: NOAA Environmental Technology Laboratory 

      Address: 325 Broadway
      City: Boulder
      Province_or_State: Colorado
      Postal_Code: 80305-3328
      Country: US
   End_Group
End_Group
Group: Personnel
   Role: Investigator
   First_Name: Stephen
   Last_Name: Katzberg
   Group: Contact_Address
      Address: NASA Langley Research Center
      Address: M.S. 328
      Address: NASA-Langley Research Center
      City: Hampton
      Province_or_State: VA
      Postal_Code: 23681-0001
   End_Group
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Cryosphere
   Term: Snow/Ice
   Variable_Level_1: Snow Cover
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Land Surface
   Term: Soils
   Variable_Level_1: Soil Moisture/Water Content
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Spectral/Engineering
   Term: Radar
End_Group
Group: Parameters
   Category: EARTH SCIENCE
   Topic: Terrestrial Hydrosphere
   Term: Snow/Ice
   Variable_Level_1: Snow Cover
End_Group
Keyword: bistatic radar
Keyword: GPS
Keyword: GPS data
Sensor_Name: GPS > Global Positioning System
Sensor_Name: GPS RECEIVERS
Source_Name: AIRCRAFT
Source_Name: GPS > Global Positioning System Satellites
Group: Temporal_Coverage
   Start_Date: 2002-02-19
   Stop_Date: 2002-02-21
End_Group
Group: Temporal_Coverage
   Start_Date: 2003-02-22
   Stop_Date: 2003-02-24
End_Group
Group: Temporal_Coverage
   Start_Date: 2003-03-25
   Stop_Date: 2003-03-31
End_Group
Data_Set_Progress: complete
Group: Spatial_Coverage
   Southernmost_Latitude: 39.5
   Northernmost_Latitude: 41
   Westernmost_Longitude: -107.5
   Easternmost_Longitude: -105
End_Group
Group: Location
   Location_Category: CONTINENT
   Location_Type: NORTH AMERICA
End_Group
Group: Location
   Location_Category: CONTINENT
   Location_Type: NORTH AMERICA
   Location_Subregion1: UNITED STATES OF AMERICA
End_Group
Project: CLPX > Cold Land Processes Field Experiment
Data_Set_Language: English
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_Format: HDF
End_Group
Group: Summary

   This data set consists of measurements of GPS signals reflected from the 
   Earth's surface and collected on an airborne platform. A modified GPS Delay 
   Mapping Receiver (DMR) tracks and measures the direct, line-of-sight, right 
   hand circulary polarized (RHCP) signal of a GPS satellite. It also 
   simultaneously measures the delayed, Earth-reflected, near-specular, LHCP GPS 
   signal. These measurements are a form of bistatic radar. The measurements can 
   be used to estimate the surface scattering coefficient and path delays between 
   the direct and reflected GPS signals. Over land, scattering coefficients can 
   be used to estimate changes in surface soil moisture. Over water surfaces, the 
   reflected pulses can be used to sense roughness and derive wind speeds. The 
   bistatic range measurements can also be used to estimate the receiver height 
   above the surface in a form of aircraft altimetry. 

   Data were collected throughout each Meso-cell Study Area (MSA) within the Cold 
   Land Processes Field Experiment (CLPX) Small Regional Study Area (SRSA, 39.5 
   N-41 N, 105 W-107.5 W). Spatial resolution of these data is variable depending 
   on airborne height and scattering regime (specular or rough). Data were 
   collected 19 and 21 February 2002, and 22-24 February and 25, 30, 31 March 
   2003. Data 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/clpx/
   Description: CLPX Site
End_Group
Group: Related_URL
   Group: URL_Content_Type
      Type: VIEW PROJECT HOME PAGE
   End_Group
   URL: http://nsidc.org/forms/nsidc0112.html
   Description: Register as a CLPX user
End_Group
Metadata_Name: CEOS IDN DIF
Metadata_Version: 9.7
DIF_Creation_Date: 2003-09-29
Last_DIF_Revision_Date: 2013-10-10
Group: DIF_Revision_History

   Removed Get External Data and Documentation link and replaced it with Get 
   External Data, cleanup for Search. 

End_Group