This mosaic is composed of about 50 about 50 red, green and violet filter Viking Orbiter images, mosaicked in an orthographic projection at a scale of 1 kilometer per pixel. The images were acquired in 1980 during late northern summer on Mars. The mosaic covers the region from latitude -70 degrees to 50 degrees and longitude 260 degrees to 360 degrees. The bright white region near the bottom of the image is due to carbon dioxide frost in the Hellas impact basin, which is about 2,000 kilometers in diameter. The bright yellow region at the top is Arabia. This digital mosaic was produced by Jody Swann using the Planetary Image Cartography System (PICS) image-processing system developed at the U.S. Geological Survey in Flagstaff, Arizona.
