Abstract
Two FORTRAN programs are presented for performing the transformations between an oblique photo, and a map with associated high-resolution DTM of the area covered by the photo. Using a minimum of three control points common to the map and photo, the first program CAM-LOC determines the location and orientation of the camera. Solution can be with or without a knowledge of the camera focal length and aircraft elevation. The second program, OPX-FORM, uses the transformation matrix determined by CAM-LOC and a high-resolution DTM, to perform the transformation from the map to the oblique photo and vice versa. Using these programs it is possible (a) to determine the camera location for oblique photos, (b) to extract the true location of objects in the photo and to produce orthophotos from them, and (c) to map spatial data back onto the photograph, for instance overlaying planned highways, boundaries, or grids. The method is shown to work at incidence angles of up to 60 °.
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