Rhea Voyager Global Mosaic 833m v1
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.
- Publisher
- USGS Astrogeology Science Center
- Author
- USGS Astrogeology Science Center
- Originator
- Group
- PDS
- Added to Astropedia
- 2 April 2014
- Modified
- 4 February 2020
General
- 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.
- Geospatial Data Presentation Form
- Global Mosaic, Raster Data, Remote-sensing Data
- Edition
- 1
- Online Linkage
- https://planetarymaps.usgs.gov/mosaic/Rhea_Voyager_mosaic_global_833m.tif
- Native Data Set Environment
- ISIS v3
- Supplemental Information
- https://pds-imaging.jpl.nasa.gov/portal/cassini_mission.html
Keywords
- System
- Saturn
- Target
- Rhea
- Theme
- Remote Sensing, Satellites, Geomorphology
- Mission
- Voyager
- Mission Specific
- Voyager 1, Voyager 2
- Instrument
- VIS
Contact and Distribution
- Access Constraints
- Public domain
- Use Constraints
- None
Data Status and Quality
- Currentness Reference
- Publication date
- Progress
- Complete
- Update Frequency
- None planned
Lineage
- PDS Status
- PDS 3 Like
- Source Originator
- Astrogeology Science Center
- Source Online Linkage
- https://pds-imaging.jpl.nasa.gov/volumes/voyager.html, https://pds-imaging.jpl.nasa.gov/portal/voyager_mission.html
- Type of Source Media
- Online
Geospatial Information
- Minimum Latitude
- -90
- Maximum Latitude
- 90
- Minimum Longitude
- -180
- Maximum Longitude
- 180
- Direct Spatial Reference Method
- Raster
- Object Type
- Pixel
- Lines (pixels)
- 2881
- Samples (pixels)
- 5761
- Bit Type
- 8
- Quad Name
- Radius A
- 764000
- Radius C
- 764000
- Bands
- 1
- Pixel Resolution (meters/pixel)
- 833.3947
- Scale (pixels/degree)
- 16
- Horizontal Coordinate System Units
- Meters
- Map Projection Name
- Sinusoidal
- Latitude Type
- Planetocentric
- Longitude Direction
- Positive West
- Longitude Domain
- -180 to 180