Aerial Photography: Reliability and Uses of Information Page 1 of 3 Relief Displacement Unlike maps, aerial photographs do not show the true plan or top view of objects. Images of the tops of objects appearing in a photograph are displaced from the images of their bases. This causes any object standing above the terrain to "lean away" from the point of a photograph radially. The magnitude of relief displacement depends upon a number of conditions, for example: flying height distance from the photograph's principle point to the feature height of the feature As these features are geometrically related we can measure an object's relief displacement and radial position on a photograph, thereby determining the height of the object. Although accuracy is limited it is useful where only approximate object heights are needed. View an image before and after correction.   | 1 | 2 | 3 | Page 1 of 3