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| View Original: | Callisto equatorial.jpg (11921x4617) | |||
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| Keywords: Callisto equatorial.jpg LargeImage en Prepared on behalf of the Planetary Geology and Geophysics Program Solar System Exploration Division Office of Space Science National Aeronautics and Space Administration This image was extracted from the i2770 PDF at the resolution that it was stored within that file It covers lattitudes from -57 to +57 with the north and south polar regions covered by separate files This global map base uses the best image quality and moderate resolution coverage supplied by Galileo SSI and Voyager 1 and 2 Batson 1987; Becker and others 1998; Becker and others 1999; Becker and others 2001 The digital map was produced using Integrated Software for Imagers and Spectrometers ISIS Eliason 1997; Gaddis and others 1997; Torson and Becker 1997 The individual images were radiometrically calibrated and photometrically normalized using a Lunar-Lambert function with empirically derived values McEwen 1991; Kirk and others 2000 A linear correction based on the statistics of all overlapping areas was then applied to minimize image brightness variations The image data were selected on the basis of overall image quality reasonable original input resolution from 20 km/pixel for gap fill to as much as 150 m/pixel and availability of moderate emission/incidence angles for topography Although consistency was achieved where possible different filters were included for global image coverage as necessary clear for Voyager 1 and 2; clear and green 559 nm for Galileo SSI Individual images were projected to a Sinusoidal Equal-Area projection at an image resolution of 1 0 kilometer/pixel The final constructed Sinusoidal projection mosaic was then reprojected to the Mercator and Polar Stereographic projections included on this sheet The final mosaic was enhanced using commercial software http //geopubs wr usgs gov/i-map/i2770/ USGS 2002-05-01 Maps of Callisto PD-USGov | ||||
