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

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