Planetary Data System NASA/Jet Propulsion Laboratory Mail Stop 202-101 4800 Oak Grove Drive Pasadena, CA 91109 (818) 354-4321 pds_operator@jpl.nasa.gov
NSSDC ID NAME QUANTITY PSPG-00645 MIDR full resolution (F-MIDR) 77(1) PSPG-00051 MIDR compressed once (C1-MIDR) 45(1) PSPG-00188 MIDR compressed twice (C2-MIDR) 20(1) PSPG-00175 MIDR compressed thrice (C3-MIDR) 06(1)
(PSPG-00645) Full resolution F-MIDR
Full-resolution Mosaic Image Data Records (F-MIDR) consist of Synthetic Aperature Radar (SAR) mosaics if Venus' surface 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 7,168 lines (aligned with latitudes) and 8,192 samples, arranged as 56 1024 x 1024 files. F-MIDRs have been generated for key terrains on the planet, regions where high spatial resolution is required for analysis. 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. Over the course of the first mapping cycle, approximately 220 F-MIDRs have been generated, covering about 15% of Venus and constituting about 12.3 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.
The following CD-ROM volumes contain F-MIDRs: 1, 3-11, 13, 15, 17, 18, 23-29, 32, 35, 36, 38, 39, 42, 44-46, 49, 50, 52, 53, 55, 56, 58, 59, 62-68, 70-77, 80, 86, 87, 93, 94, 98, 101-111, 119-125.
(PSPG-00051) Compressed once C1-MIDR
Compressed once Mosaic Image Data Records (C1-MIDRs) consist of mosaics generated from compressed basic image data records (C-BIDRs).
C1-BIDRs have been generated by computing 3 x 3 pixel arithmetic moving averages from the F-BIDRs. Each C1-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 7K lines (aligned with latitudes) and 8K samples, arranged as 56 1K x 1K files. C1-MIDRs, with their 225 m pixel widths, are designed to cover the planet at reasonably high resolution and high signal to noise. Each C1-MIDR has been corrected for cross-track shading (i.e., for seams) by a feathering procedure. The 1K x 1K 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. Over the course of the first mapping cycle, 184 C1-MIDRs will be generated, for a total volume of 10.3 Gbytes.
C1-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 C1-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.
The following CD-ROM volumes contain C1-MIDRs: 2, 12, 14, 16, 19-22, 30, 31, 33, 34, 37, 40, 41, 43, 47, 48, 51, 54, 57, 60, 61, 69, 78, 79, 84, 85, 88-92, 95-97, 99, 100, 112-117, 126.
(PSPG-00188) Compressed twice C2-MIDR
Compressed twice Mosaicked Image Data Records (C2-MIDRs) consist of mosaics generated by computing 3 x 3 pixel arithmetic moving averages from the C1-MIDRs. Each C2-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 C2-MIDR has 7,168 lines (aligned with latitudes) and 8,192 samples, arranged as 56 1024 x 1024 files on CD-ROM. C2-MIDRs, with their 675 m 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 C2-MIDR frame covers 45 degrees of latitude and longitude. Thirty-four C2-MIDRs were generated during the first mapping cycle.
C2-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 C2-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.
The following CD-ROM volumes contain C2-MIDRs: 30, 33, 34, 37, 43, 51, 54, 61, 69, 81-84, 90, 92, 96, 112, 118, 119, 126.
(PSPG-00175) Compressed thrice C3-MIDR
Compressed thrice Mosaic Image Data Records (C3-MIDRs) consist of mosaics generated by computing 3 x 3 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 C3-MIDR has 7168 lines (aligned with latitudes) and 8,192 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.
The following CD-ROM volumes contain C3-MIDRs: 69, 78, 84, 85, 119, 126.
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.