MGN RDRS Compressed-Resolution Mosaicked Image Data Record (C1MIDR)

C1MIDR – Compressed-Resolution MIDR

PDS3 Data Set ID: MGN-V-RDRS-5-MIDR-C1-V1.0DOI: 10.17189/1522528

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 C1MIDR Data Set Description for the PDS3 C1MIDR products.

The Radar System (RDRS) Compressed-Resolution Mosaicked Image Data Records (C1MIDRs) consist of mosaics generated from Compressed Basic Image Data Records (CBIDRs). CBIDRs have been generated by computing 3 x 3 pixel arithmetic moving averages from the Full-Resolutions BIDRs (FBIDRs). Each C1MIDR 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 C1MIDR has 7,000 lines (aligned with latitudes) and 8,000 samples, arranged as 56 1000 x 1000 files. C1MIDRs, with their 225 m pixel widths, are designed the cover the planet at reasonably high resolution and high signal to noise. The new PDS4 migrated C1MIDR 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, C1MIDR products, which include the files in the table below, have one of the following product IDs:

c1midr_xxpwww_v (first mapping cycle, v = 1-digit version number)

c1midr_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 C1MIDR 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 C1MIDR, 896 lines by 1024 samples, created by averaging groups of 8 x 8 pixels in the original C1MIDR.
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 C1MIDR.
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. C1MIDR products occur in 45 of the subdirectories found at the data set link above for a total of 386 products. The subdirectories containing C1MIDR products are in the table below (from left to right):

mg_0002	mg_0012	mg_0014	mg_0016	mg_0019	mg_0020	mg_0021	mg_0022
mg_0030	mg_0031	mg_0033	mg_0034	mg_0037	mg_0040	mg_0041	mg_0043
mg_0047	mg_0048	mg_0051	mg_0054	mg_0057	mg_0060	mg_0061	mg_0069
mg_0078	mg_0079	mg_0084	mg_0085	mg_0088	mg_0089	mg_0090	mg_0091
mg_0092	mg_0095	mg_0096	mg_0097	mg_0099	mg_0100	mg_0112	mg_0113
mg_0114	mg_0115	mg_0116	mg_0117	mg_0126