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| The image in every photograph is distorted due to terrain relief and camera tilts at the time of exposure. Although the distortions may not be apparent during casual examination, they become noticeable when attempting to extract measurements from the images. It is however possible to eliminate these distortions if relief data covering the area of interest is available. |
| The process known as orthorectification is a computer intensive process that eliminates all distortions within the photographic image. The resulting image has the scale accuracy of a conventional map, and is often used as a backdrop to topographic line maps. |  |
 | Geographix Inc. generates orthophotos in B/W or color, of single images to blocks of photographs consisting of hundreds of images. |