Orthophoto

An orthophoto, orthophotograph or orthoimage is an aerial photograph geometrically corrected (`orthorectified`) such that the scale is uniform: the photo has the same lack of distortion as a map. Unlike an uncorrected aerial photograph, an orthophotograph can be used to measure true distances, because it is an accurate representation of the Eart.....
Found on http://en.wikipedia.org/wiki/Orthophoto

Orthophoto

A copy of an image corrected for variations in scale and height displacements Cdetails ...
Found on http://www.cryer.co.uk/glossary/o/index.htm

Orthophoto

Photographic image, rectified to remove the distortions caused by variations in terrain height, resulting in an image in which all pixels are to the same scale.
Found on http://www.encyclo.co.uk/local/20195
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