Callisto Controlled Photomosaic of the Valfodr Quadrangle
- Publisher
- USGS Astrogeology Science Center
- Abstract
- This sheet is one in a series of maps that covers the surface of Galilean satellites of Jupiter at nominal scale of 1:5,000,000(Batson and others, 1980). Sources for the series were Voyager 1 and 2 images. Essential features of the mapping are noted below. Cartographic Control Mercator, Lambert Conformal Conic, and Polar Stereographic projections used for the maps of Callisto are based on a sphere with a radius of 2400km. The projections have common scales of 1:4,780,000 at lat ±21.3Ë and 1:4,769,000 at lat ±65.2Ë. Longitude increases to the west in accordance with the astronomical convention. Planimetric control was derived by photogrammetric triangulation using Voyager 1 and 2 pictures (Davies and Katayama, 1981). The meridians are numbered so that the reference crater, Saga is centered on lat 0.6ËN., long 326Ë. Mapping Technique Digital mosaics were assembled at a digital scale of 1/32Ë (1.3km) per pixel according to methods described by Batson (1987) and Edwards (1987) and transformed to the projections described above. Details from an unpublished, 1:15,000,000-scale, airbrush drawing were combined with the mosaic in regions where the image data were very poorly resolved. The mosaic was retouched to obtain uniform tonal balance. Extreme variations in picture resolution precluded comparable display of the images used for the map compilation. Further limitations were imposed by dark albedo markings, which tend to obscure distinctive surface details. Digital processing and mosaicking were done by Kevin F. Mullins. References: Batson, R.M., Bridges, P.M., Inge, J.L. Isabell, Christopher, Masursky, Harold, Strobell, M.E., and Tyner, R.L., 1980, Mapping the Galilean satellites of Jupiter with Voyager data: Photogrammetric Engineering and Remote Sensing, v. 46, n0. 10, p.1303-1312. Batson, R.M., 1987, Digital cartography of the planets: New methods, its status, and its future: Photogrammetric Engineering and Remote Sensing, v.46, no. 10, p. 1303-1312 Davies, M.E., and Katayama, F.Y., 1981, Coordinates of features on the Galilean Satellites: Journal of Geophysical Research, v.86, no. A10, p.8635-8657. Edwards, Kathleen, 1987, Geometric processing of digital images of the planets: Photogrammetric Engineering and Remote Sensing, v.53, no.9, p. 1219-1222
Contact and Distribution
- Format
- Regional Mosaic
- Access Scope
- Series Id
- 2074
- Native Data Set Environment
- Astrogeology Theme
- Cartography, Image Processing, Remote Sensing
- Mission Names
- Voyager
- Instrument Names
- Voyager 1, Voyager 2
- Online Package Link
- https://astrogeology.usgs.gov/search/map/callisto_controlled_photomosaic_of_the_valfodr_quadrangle
- External File Size
- 5007401
- Online File Link
- http://astropedia.astrogeology.usgs.gov/download/Callisto/Mosaic/Callisto-Controlled-Photomosaic-of-the-Valfodr-Quadrangle.pdf
- Access Instructions
- 1 remote-sensing image ;37 x 59 cm., on sheet 69 x 66 cm., folded in envelope 30 x 24 cm.
- Contact Address
- 2255 N. Gemini Drive
- Contact City
- Flagstaff
- Contact State
- AZ
- Contact Postal Code
- 86001
- Contact Email
- astroweb@usgs.gov
Geospatial Information
- Target
- Callisto
- System
- Jupiter
- Object Type
- Grid Cell
- Quad Name
- Map Scale (hard-copy)
- 1:5000000
- Map Projection Name
- Mercator
