Rhea Voyager Global Mosaic 833m

Primary Authors

USGS Astrogeology Science Center

Originators

Astrogeology Science Center

Publisher

USGS Astrogeology Science Center

Abstract

Product Information: This global digital mosaic uses 25 images from Voyager 1 and is a sinusoidal projection with a resolution of 833 meters per pixel (m). Digital image processing of the Voyager pictures was done in the Flagstaff Image Processing Facility. The programs and techniques that were used have been developed over a period of several years by a team of scientists and programmers (Batson, 1984). Two levels of digital image processing are commonly used for planetary mapping. Level 1 is intended to restore the pictures to the quality that would have been produced by a “perfect” camera, this is done by removing “artifacts” from lens distortions and electronic recording and transmitting systems. Level 2 processing is done to correct image geometry to match appropriate map projections. Final map/ mosaic complications are done with level 2, geometrically corrected, images (Batson, 1984). Both level 1 and level 2 processing are done to preserve the original contrast captured by the camera which may include very dark and or very light areas. Mission and Instrument Information: The Voyager I space craft launched September 5, 1977 and passed through the Saturnian system on November 12, 1981. Voyager 2 launched August 20, 1977 and made a similar encounter with the Saturnian system, returning more images of the satellites. The space craft carried both wide- and narrow- angle cameras, which were able to capture and return moderate- to high- resolution images of the satellites Rhea, Dione, Enceladus, Mimas, Tethys, and Iapetus. The rapid speed of the space craft as it approached the satellites resulted in significant mis-matches of image resolution and image blur (Greely & Batson, 2007; Batson, 1984). References: Batson, R. (1984). Voyager 1 and 2 Atlas of Six Saturnian Satellites (NASA-SP-474). Washington, DC: National Aeronautics and Space Administration (NASA). https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19840027171.pdf Greely, R., & Batson, R. (2007). Planetary Mapping. (ISBN 0-521-30774-0). New York, NY: Cambridge University Press.

Purpose

This image mosaic is one of several products created as the first step of cartography planning in support of the Cassini-Huygens Mission to Saturn & Titan.

Contact and Distribution

Format

Airbrush, Global Mosaic, Raster Data, Remote-sensing Data

Access Constraints

Public domain

Access Scope

PDS

Use Constraints

None

Edition

1

Supplemental Information

https://pds-imaging.jpl.nasa.gov/portal/cassini_mission.html

Native Data Set Environment

ISIS v3

Astrogeology Theme

Geomorphology, Remote Sensing, Satellites

Mission Names

Voyager

Instrument Names

VIS

Online Package Link

https://astrogeology.usgs.gov/search/map/rhea_voyager_global_mosaic_833m

External File Size

32 MB

Online File Link

https://planetarymaps.usgs.gov/mosaic/Rhea_Voyager_mosaic_global_833m.tif

Contact Address

2255 N. Gemini Drive

Contact City

Flagstaff

Contact State

AZ

Contact Postal Code

86001

Contact Email

astroweb@usgs.gov

Currentness Reference

Publication date

Progress

Complete

Update Frequency

None planned

Source Online Linkage

{https://pds-imaging.jpl.nasa.gov/volumes/voyager.html,https://pds-imaging.jpl.nasa.gov/portal/voyager_mission.html}

PDS Status

PDS 3 Like

Geospatial Information

Target

Rhea

System

Saturn

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)

2881

Raster Column Count (samples)

5761

Bit Type (8, 16, 32)

8

Quad Name

Radius A

764000

Radius C

764000

Bands

1

Pixel Resolution (meters/pixel)

833.3947

Scale (pixels/degree)

16

Map Projection Name

Sinusoidal

Latitude Type

Planetocentric

Longitude Direction

Positive West

Longitude Domain

-180 to 180