With orthoimagery, the resolution refers to the distance on the ground represented by each pixel. The source imagery may be black-and-white, natural color, or color infrared with a pixel resolution of 1-meter or finer. A mathematical equation based on ground control points, sensor calibration information, and a digital elevation model is applied to each pixel to rectify the image to obtain the geometric qualities of a map.Ī digital orthoimage may be created from several photographs mosaicked to form the final image. An orthoimage is a uniform-scale image where corrections have been made for feature displacement such as building tilt and for scale variations caused by terrain relief, sensor geometry, and camera tilt. High resolution orthorectified images combine the image characteristics of an aerial photograph with the geometric qualities of a map. Series of High Resolution Orthoimagery (2008, 2010, and 2012) of the Hoover Dam BypassProject.
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