MGN RDRS Twice Compressed-Resolution Mosaicked Image Data Record (C2MIDR)

C2MIDR – Twice Compressed-Resolution MIDR

PDS3 Data Set ID: MGN-V-RDRS-5-MIDR-C2-V1.0DOI: 10.17189/1522527

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 C2MIDR Data Set Description for the PDS3 C2MIDR products.

The Radar System (RDRS) Twice Compressed-Resolution Mosaicked Image Data Records (C2MIDRs) consist of mosaics generated by computing 3 x 3 pixel arithmetic moving averages from the Compressed-Resolution MIDRs (C1MIDRs). Each C2MIDR 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 C2MIDR has 7168 lines (aligned with latitudes) and 8192 samples, arranged as 56 1024 x 1024 files. C2MIDRs, with their 675 m pixel widths, are designed to cover the planet at reasonably high resolution and high signal to noise. One C2MIDR frame covers ~45*45 degrees of latitude and longitude. The new PDS4 migrated C2MIDR 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, C2MIDR products, which include the files in the table below, have one of the following product IDs:

c2midr_xxpwww_v (first mapping cycle, v = 1-digit version number)

c2midr_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 C2MIDR 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 C2MIDR, 896 lines by 1024 samples, created by averaging groups of 8 x 8 pixels in the original C2MIDR.
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 C2MIDR.
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. C2MIDR products occur in 20 of the subdirectories found at the data set link above for a total of 94 products. The subdirectories containing C2MIDR products are in the table below (from left to right):

mg_0030	mg_0033	mg_0034	mg_0037	mg_0043	mg_0051	mg_0054	mg_0061
mg_0069	mg_0081	mg_0082	mg_0083	mg_0084	mg_0090	mg_0092	mg_0096
mg_0112	mg_0118	mg_0119	mg_0126