MGN RDRS Three Times Compressed-Resolution Mosaicked Image Data Record (C3MIDR)

C3MIDR – Three Times Compressed-Resolution MIDR

PDS3 Data Set ID: MGN-V-RDRS-5-MIDR-C3-V1.0 (DOI: 10.17189/1522519), and a few stragglers here.

PDS4 Bundle: urn:nasa:pds:magellan_midrDOI: 10.17189/5ktn-9j71

For more information about RDRS MIDR products, see the Magellan MIDR User's Guide for the PDS4 Dataset, and the C3MIDR Data Set Description for the PDS3 C3MIDR products.

The Radar System (RDRS) Three Times Compressed-Resolution Mosaicked Image Data Records (C3MIDRs) consist of mosaics generated by computing 3 x 3 arithmetic moving averages from the Twice Compressed-Resolution MIDRs (C2MIDRs). Each C3MIDR 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 C3MIDR has 7168 lines (aligned with latitudes) and 8192 samples, arranged as 56 1024 x 1024 files. C3MIDRs, with their 2.025 km pixel widths, are designed to cover the planet at reasonably high resolution and high signal to noise. One C3MIDr covers ~90 degrees in latitude and ~120 degrees in longitude. The new PDS4 migrated C3MIDR archive contains the same data as the original PDS3 archive, but with the multiple small framelets of each product put together into a single mosaic. The updated archive also has contrast-enhanced and easier to display browse products stored as JPEG files, along with improved metadata in the MIDR PDS4 labels. For a more comprehensive understanding of this dataset and its improvements, please see the Magellan MIDR User's Guide for the PDS4 Dataset.

In ODE, C3MIDR products, which include the files in the table below, have one of the following product IDs:

c3midr_xxpwww_v (first mapping cycle, v = 1-digit version number)

c3midr_xxpwww_nvv (following cycles, n = cycle number, vv = 2-digit version number)

where:

xx = 2-digit number denoting the center latitude of the image

p = either N or S depending on the image's position relative to the equator

www = 3-digit number denoting the center longitude of the image

For each migrated PDS4 C3MIDR data product in ODE's data product search result page, it is linked to the following files appear with their corresponding PDS3 label files, including the ancillary data and framelets that make up a single 7168 line by 8192 sample mosaic.

File Name	File Content
browse.img	The browse version of the C3MIDR, 896 lines by 1024 samples, created by averaging groups of 8 x 8 pixels in the original C3MIDR.
frame.tab	A table describing the range of latitude and longitude within each framelet.
geom.tab	Selected entries from the Magellan Experimenter’s Notebook. The Notebook is generated from the Magellan Radar Mapping Sequencing Software and is based on predicted information. Information is included in GEOM.TAB on orbit numbers for which data were acquired and used in a given file, together with information on radar viewing geometry and image quality.
hist.tab	A binary histogram of pixel values in each 7168 x 8192 C3MIDR.
ffnn.img	A 1024 x 1024 image framelet, where ‘nn’ is the framelet number (01-56).

In PDS3 archives, all of the MIDR products (F, C1, C2, and C3) appear in the same PDS directory. C3MIDR products occur in 6 of the subdirectories found at the data set link above for a total of 15 products. The subdirectories containing C3MIDR products are in the table below (from left to right):

mg_0069

mg_0078

mg_0084

mg_0085

mg_00119

mg_00126

mg_00127