Magellan SAR Compressed Thrice Image Data Records on CD-ROM (PDS)

Description

Compressed Thrice Mosaic Image Data Records (C3-MIDRs) consist of mosaics generated by computing 3x3 pixel arithmetic moving averages from the C2-MIDRs. Each C3-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 C1-MIDR has 7168 lines (aligned with latitudes) and 8192 samples, arranged as 56 1024 x 1024 files on CD-ROM. C3-MIDRs, with their 2.025 km pixel widths, are designed to cover the planet at reasonably high resolution and high signal to noise. The 1024 x 1024 files have a VICAR2 format, with embedded VICAR2 labels. The data have been placed on CD-ROMs with documentation, detached Planetary Data System labels, and summary tabular information. One C3-MIDR frame covers 80 degrees in latitude and 120 degrees in longitude. No C3-MIDRs were generated during the first mapping cycle. C3-MIDRs also exist as photoproducts that have had a linear contrast enhancement applied. Photoproducts are generated from the 7K x 8K assemblage of files, so there is one photoproduct per C3-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 (B42763-000A) data set description for more details on radiometric and geometric processing of Magellan SAR data.

These CD's can be ordered through the NSSDC CD-ROM catalog at:

http://nssdc.gsfc.nasa.gov/cd-rom/web_store.cgi?category=midr

The data is also available online at:

http://pds-geosciences.wustl.edu/missions/magellan/c123midr/index.htm