Venus Magellan Global C3-MDIR Mosaic 2025m

Originators

PDS Geosciences Node

Publisher

USGS Astrogeology Science Center

Abstract

Product Information: 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). References: Ford, J. P., Plaut, J. J., Weitz, C. M., Farr, T. G., Senske, D. A., Stofan, E. R., Michaels, G., & Parker, T. J. (1993). Guide to Magellan Image Interpretation. JPL Publication 93-24 pp. 1-18. https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19940013181.pdf Ford, J. P., Blom, R. G., Crisp, J. A., Elachi, C., Farr, T. G., Saunders, R. S., Theilig, E. E., et al. (1989). Spaceborne Radar Observations, a guide for Magellan radar-image analysis. JPL Publication 89-41. https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19900013510.pdf

Purpose

mosaic of the C3-MIDR tiles

Contact and Distribution

Format

Global Mosaic

Access Constraints

public domain

Access Scope

PDS

Use Constraints

None

Edition

1

Supplemental Information

http://pds.nasa.gov/ds-view/pds/viewProfile.jsp?dsid=MGN-V-RDRS-5-MIDR-C3-V1.0, http://geo.pds.nasa.gov/missions/magellan/c123midr, http://www2.jpl.nasa.gov/magellan/, https://pds-imaging.jpl.nasa.gov/software/MGN_SAR_UserGuide.pdf

Native Data Set Environment

ISIS v3

Astrogeology Theme

Image Processing, Remote Sensing

Mission Names

Magellan

Instrument Names

SAR

Online Package Link

https://astrogeology.usgs.gov/search/map/venus_magellan_global_c3_mdir_mosaic_2025m

External File Size

170 MB

Online File Link

https://planetarymaps.usgs.gov/mosaic/Venus_Magellan_C3-MDIR_Global_Mosaic_2025m.tif

Contact Address

2255 N. Gemini Drive

Contact City

Flagstaff

Contact State

AZ

Contact Postal Code

86001

Contact Email

astroweb@usgs.gov

Data Status and Quality

Time Period of Content (start)

1989-05-04

Time Period of Content (stop)

1994-10-12

Currentness Reference

Publication date

Progress

Complete

Update Frequency

None planned

Logical Consistency

Finally, in some cases a cross track seam removal process has been applied.

Process Description

This archive was produced by Jason Hyon. Mike Martin (JPL), Gail Woodward (JPL), Peter Ford (MIT), Robert Mehlman (UCLA), and Jason Hyon (JPL) designed the PDS labels and the tables. Florence Moss (JPL) and Jason Hyon developed the software to generate the PDS labels and tables. Raymond Arvidson and Gail Woodward created the catalog templates, with help from Pam Woncik (JPL), Mary Dale-Bannister (Washington University), and Susan Slavney (Washington University). The data and documentation were generated at MIT by Peter Ford, Gordon Pettengill, Fang Liu, and Joan Quigley from data supplied by the Magellan Project. Please direct any questions and comments to the PDS Geosciences Node, geosci@wunder.wustl.edu.

Lineage

Process Date

2022-09-01

Source Title

Magellan Compressed Mosaicked Image Data Record (C1-, C2-, C3-MIDR)

Source Online Linkage

{https://pds-imaging.jpl.nasa.gov/volumes/magellan.html#mgnMIDR,http://pds-imaging.jpl.nasa.gov/portal/magellan_mission.html}

PDS Status

PDS 3 Archived

Geospatial Information

Target

Venus

Minimum Latitude

-90

Maximum Latitude

90

Minimum Longitude

-180

Maximum Longitude

180

Direct Spatial Reference Method

Raster

Object Type

Grid Cell

Raster Row Count (lines)

9388

Raster Column Count (samples)

18775

Bit Type (8, 16, 32)

8

Quad Name

Radius A

6051000

Radius C

6051000

Bands

1

Pixel Resolution (meters/pixel)

2025

Scale (pixels/degree)

52.153

Map Projection Name

Equirectangular

Latitude Type

Planetocentric

Longitude Direction

Positive East

Longitude Domain

-180 to 180