AUTOMATIC PHOTOGRAMMETRIC PROCESSING OF SPOT IMAGERY FOR POINT DETERMINATION, DTM GENERATION AND ORTHOPROJECTION

For the photogrammetric processing of SPOT imagery a completely automatic procedure is described. It includes a sophisticated region growing image matching algorithm, point determination using a polynomial approach for orbit modelling, the generation of digital terrain models (DTM) and the computation of orthophotos. Only the image coordinates of a number of ground control points must be measured interactively. The procedure is evaluated by means of two practical projects. In contrast to many other investigations of SPOT the whole images were processed and ample independent control information for a sound statistical accuracy check was available. The achieved empirical height accuracy of better than 10 m is a very good result considering the small base-to-height ratios of 0.4 and 0.6 respectively.