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The Orthoimagery data theme includes orthorectified image data of the earth's surface, from either satellite or airborne sensors. An orthoimage is a raster image that has been geometrically corrected (orthorectified) to remove distortion caused by differences in elevation, sensor tilt and, optionally, by sensor optics. Data is orthorectified to achieve an accuracy commensurate with a given topographic map equivalent. The data theme includes orthorectified imagery from the radio, through the visible, to the ultraviolet region of the electromagnetic spectrum.