U.S.G.S. Image © CNES 1987 Inset satellite image map of Washington D.C. Area, 1:50 000. Includes information about the satellites, data collection, wavelengths used, and information on how the map was put together. Includes grid with Scene ID Information on SPOT data may be obtained through SPOT Image Corporation, 1897 Preston White Drive, Reston, Virginia 22091 The root-mean-square-error in position of well-identified features is less than 30 meters. To place on the North American Datum 1983, move the graticule lines 12 meters south and 26 meters west. Projection and 5,000-meter grid, zone 18: Universal Transverse Mercator 10,000 foot grid ticks based on the Maryland coordinate system and the Virginia coordinate system, north zone