R.Collins, A.Hanson, E.Riseman and H.Schultz,
"Automatic Extraction of Buildings and Terrain from Aerial Images,"
International Workshop on Automatic Extraction of
   Man-Made Objects from Aerial and Space Images,
Ascona, Switzerland, April 1995, pp. 169-178.


A system has been developed to acquire, extend and refine 3D geometric site models from aerial imagery. The system hypothesizes potential building roofs in an image, automatically locates supporting geometric evidence in other images, and determines the precise shape and position of the new buildings via multi-image triangulation. Model-to-image registration techniques are applied to align new images with the site model, and model extension and refinement procedures are performed to acquire previously unseen buildings and improve the geometric accuracy of the existing 3D models. A correlation-based terrain recovery algorithm provides complementary information about the site, in the form of a digital elevation map.

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