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 âperfectâ camera, this is done by removing âartifactsâ 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