High resolution orthorectified images combine the image characteristics of an aerial photograph with the geometric qualities of a map. 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. 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. A digital orthoimage may be created from several photographs mosaicked to form the final image. The source imagery may be black-and-white, natural color, or color infrared with a pixel resolution of 1-meter or finer. With orthoimagery, the resolution refers to the distance on the ground represented by each pixel.
N: 90.0 S: -90.0 E: 180.0 W: -180.0
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|Coverage Type||Zone Identifier||Geometry||Granule Representation|
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Information Systems Management
U.S. Geological Survey
Sioux Falls, SD 57198-0001
Format Type: Native
Fees: $30 per scene/frame
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