COLLECTION NAME:
David Rumsey Historical Map Collection
Record
Author:
USGS Astrogeology Science Center
Date:
2014
Short Title:
Venus Magellan Global C3-MDIR Synthetic Color Mosaic 4641m v1
Publisher:
USGS Astrogeology Science Center
Publisher Location:
Flagstaff
Type:
Aerial Photograph
Region:
Venus
Subject:
Celestial
Full Title:
Venus Magellan Global C3-MDIR Synthetic Color Mosaic 4641m v1
List No:
10606.000
Publication Author:
USGS Astrogeology Science Center
Pub Date:
2014
Pub Title:
Venus Magellan Global C3-MDIR Synthetic Color Mosaic 4641m v1
Pub Note:
This synthetic colorized version of the C3-MIDR mosaic was developed to simulate the surface of Venus. This mosaic was created from the Magellan Full resolution Basic Image Data Records (F-BIDRs), the highest resolution radar images of the Venus surface (~75 meters per pixel [m]). To make this product, the F-BIDR is assembled into Full-Resolution Mosaicked Image Data Records (F-MIDRs) which are then averaged in successive operations resulting in each pixel being the average of nine pixels resulting in compressed BIDR or C-BIDR. The resulting C-BIDR are then mosaicked into 8192 x 8192 arrays called C1-MIDR (Compressed Once - Mosaicked Image Data Record) which are then further compressed into C2- and C3-MIDR. The original Magellan Compressed Mosaicked Image Data Record (C3-MIDR) archive contains three times compressed mosaics of image swaths (C-BIDRs) at a resolution of 2025 m/pixel. C3-MIDRs consist of mosaics generated by computing 3x3 pixel arithmetic moving averages from the C2-MIDRs. C3-MIDRs, with their 2.025 km pixel widths, are designed to cover the planet at reasonably high resolution and high signal to noise ratio. (Ford et al., 1993). Mission and Instrument Information: The Magellan Mission to Venus launched on May 4, 1989 on board the Space Shuttle Atlantis. The spacecraft arrived at Venus on August 10th, 1990 and was inserted into a near-polar elliptical orbit. The primary mission requirements were to map at least 70% of the surface at a resolution better than 300 meters/pixel and to determine the global relief at such a resolution as to facilitate detailed analysis of tectonic, volcanic, eolian, and impact features. Magellan successfully completed four mapping cycles at Venus. The first mapping cycle lasted from mid-September 1990 to mid-May 1991 focused on fulfilling the primary mission requirements. The second mapping cycle was from mid-May 1991 to mid-January 1992 and was dedicated to filing in gaps in the cycle 1 coverage and obtaining coverage of the south polar region; this cycle resulted in 54% of surfaced coverage and increased the cumulative coverage of the mission to 96%. Cycle 3 was from mid-January to mid-September 1992 and focused on acquiring stereo image coverage; this cycle resulted in about 21% surface coverage and increased total surface coverage to 98%. Cycle 4 was dedicated to gravity observations and as such did not add to the cumulative coverage of imagery taken by the spacecraft (Ford et al., 1993).
Pub List No:
10606.000
Pub Type:
Aerial Photograph
Image No:
10606000.jp2
Authors:
USGS Astrogeology Science Center
Link To Source
