A digital orthophoto is a computer-generated image of an aerial photograph or aerial digitial image in which displacements caused by camera orientation and terrain have been corrected and projected to a standardized map projection. Digital orthophotos are available in either black and white (gray scale), color (red, green and blue), or multi-spectral (red, green, blue, near infrared). A Digital Elevation Model (DEM) describes the elevation of points and break lines of the bare earth surface, but does not support contour modeling. A Digital Terrain Model (DTM) describes the elevation of points and break lines of the bare earth surface with additional data to describe ridgelines, peaks and valleys, etc., allowing it to be used for accurate contour modeling.

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