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A digital orthoimage is a georeferenced image prepared from a perspective photograph or other remotely-sensed data in which displacement of objects due to sensor orientation and terrain relief have been removed. It has the geometric characteristics of a map and the image qualities of a photograph. Digital orthoimages are composed of an array of georeferenced pixels that encode ground reflectance as a discrete value.
Many geographic features, including some in other framework data themes, can be interpreted and compiled from an orthoimage. Accurately-positioned, high-resolution data are considered the most useful to support the compilation of framework features.