Data Set Overview
    =================
      Global Slope Data Record (GSDR).  The surface meter-scale
      slopes are derived by fitting altimeter echoes from the
      fan-beam altimetry antenna as a function of time to Hagfors'
      radar backscatter model templates.  The data are then
      re-sampled into sinusoidal, Mercator, and north and south polar
      stereographic projections at a resolution of about 5x5
      kilometers per pixel.  Each GSDR image pixel is represented by
      a 8-bit unsigned integer.  In sinusoidal images, pixels lying
      outside the domain of the projection are set to zero.  In all
      images, pixels with unknown or unmeasured values are also set
      to zero.  The remaining values are related to the slope by the
      following equation:
 
         DN = ((SLOPE ) * 10) + 1.
 
 
      See: Software Interface Specification Document (Peter G.
           Ford, 1991, Global Altimetry and Radiometry Data
           Records, MIT-MGN-GxDR SIS Version 2.3, 40 p.) that
           is included on GxDR CD-ROMs.
 
      Note: There exist photoproducts that are identified as GxDRP
            (where x is E (Emissivity), S (Slope), RE (Reflectivity),
            or T (Topography)) however, they are not generated from
            the digital GxDR products.  They are instead produced
            from the Magellan ARCDR (Altimetry and Radiometry
            Composite Data Record) data files.
 
      Processing Level Id            : 5
      Software Flag                  : N
      Processing Start Time          : 1991-06-24T20:11:00.000
      Processing Stop Time           : 1992-12-04T00:55:49.000
 
 
    Parameters
    ==========
 
      Data Set Parameter 'RADAR-DERIVED SURFACE ROUGHNESS'
      ----------------------------------------------------
        The average surface slope derived from radar measurements,
        for a horizontal length scale that varies with the radar
        wavelength and incidence angle.
 
        Data Set Parameter Name        : RADAR-DERIVED SURFACE
                                           ROUGHNESS
        Data Set Parameter Unit        : DEGREES
        Sampling Parameter Name        : PIXEL
        Sampling Parameter Unit        : METER
        Minimum Sampling Parameter     : N/A
        Maximum Sampling Parameter     : N/A
        Sampling Parameter Resolution  : 9282
        Sampling Parameter Interval    : 4641
        Minimum Available Sampling Int : N/A
        Noise Level                    : UNK
 
 
    Source Instrument Parameters
    ============================
      Instrument Host ID              : MGN
      Data Set Parameter Name         : RADAR-DERIVED SURFACE
                                          ROUGHNESS
      Instrument Parameter Name       : RADAR ECHO POWER
      Important Instrument Parameters : 1
 
 
    Processing
    ==========
 
      Processing History
      ------------------
        Source Data Set ID  : MGN-V-RDRS-5-CDR-ALT/RAD-V1.0
        Software            : MGMMAP
        Product Data Set ID : MGN-V-RDRS-5-GDR-SLOPE-V1.0
 
 
      Software 'MGMMAP'
      -----------------
        The MIT Altimetry and Radiometry Mapping Software (MGMMAP)
        reads Altimetry and Radiometry Composite Data Records
        (ARCDRs), and generates an image of a specified data field i
        a specified map projection.  Each footprint datum is added
        with a weight and horizontal extent proportional to the
        appropriate ARCDR elements.  This software will be released t
        Magellan Data Management Archive Team (DMAT) upon the
        completion of the nominal mission.
 
        Software Name               : MGMMAP
        Software Type               : N/A
        Software Release Date       : N/A
        Node ID                     : N/A
        Cognizant Engineer          : DR. PETER G. FORD
        Software Access Description : N/A

Overview
    ========
      UNK