Data Set Overview : Full-resolution Mosaic Image Data Records (F-MIDR) consist of SAR mosaics generated from F-BIDRs (i.e., with 75 meters / pixel). Each F-MIDR is in a sinusoidal equal area projection and has an origin at 0 degrees latitude, with the central meridian defined as the longitude bisecting the mosaic. Each F-MIDR has 7168 lines (aligned with latitude) by 8192 samples, arranged on the CD-ROM as 56 1024 x 1024 files. F-MIDRs have been generated for key terrains on the planet, regions where highest spatial resolution is required for analysis.  The 1024 x 1024 files have a VICAR2 format, with an imbedded VICAR2 label. The data have been placed on CD-ROMs with documentation and detached Planetary Data System labels.  Over the course of the first mapping cycle 350 F-MIDRs have been generated, covering more than 15% of Venus, and constituting about 20 Gbytes of data.  F-MIDRs also exist as photoproducts that have had a linear contrast enhancement applied. A single enhancement has been applied to all F-MIDR photoproducts. Photoproducts are generated from the 7K x 8K assemblage of files, so there is one photoproduct per F-MIDR.  Finally, in some cases a cross track seam removal process has been applied. See the CONTENTS.TAB file on the relevant MIDR CD-ROM volume for information on which MIDRs have been seam-corrected.  Please refer to the F-BIDR (MGN-V-RDRS-5-BIDR-FULL-RES-V1.0) data set description for more details on radiometric and geometric processing of Magellan SAR data.  Processing Level Id : 5 Software Flag : N Processing Start Time : 1990-09-16 Processing Stop Time : UNK   Parameters :  Data Set Parameter 'RADAR SCALED BACKSCATTER CROSS SECTION' ----------------------------------------------------------- Cross section values that are scaled by some procedure, such as dividing by theoretical or empirical scattering laws.  Data Set Parameter Name : RADAR SCALED BACKSCATTER CROSS SECTION Data Set Parameter Unit : DIMENSIONLESS Sampling Parameter Name : PIXEL Sampling Parameter Unit : KILOMETER Minimum Sampling Parameter : N/A Maximum Sampling Parameter : N/A Sampling Parameter Resolution : 0.15 Sampling Parameter Interval : 0.075 Minimum Available Sampling Int : N/A Noise Level : UNK   Source Instrument Parameters : Instrument Host ID : MGN Data Set Parameter Name : RADAR SCALED BACKSCATTER CROSS SECTION Instrument Parameter Name : RADAR ECHO POWER Important Instrument Parameters : 1   Processing :  Processing History ------------------ Source Data Set ID : MGN-V-RDRS-5-BIDR-FULL-RES-V1.0 Software : IDPS Product Data Set ID : MGN-V-RDRS-5-MIDR-FULL-RES-V1.0   Software 'IDPS' --------------- The Image Data Processing Subsystem (IDPS) consists of a suite of VICAR routines, augmented with specialized modules, to ingest F-BIDRs, produce C-BIDRs, and generate MIDRs.  Software Name : IDPS Software Type : N/A Software Release Date : N/A Node ID : IDPT Cognizant Engineer : N/A Software Access Description : N/A

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