期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：1992
卷号：XXIX Part B4
页码：472-476
出版社：Copernicus Publications
摘要：A method is presented for the automatic extraction of topography from stereoscopic SPOT images in polar areas. Inthese regions conventional algorithms fail due to SPOT imaging characteristics and terrain texture. The maindifficulties are the large difference in orientation between two images of a stereocouple, the shortage of referencepoints and the occurrence of high reflectance zones such as snow and ice. The stereo matching procedure is split upin two parts: (i) a geometric correction method in order to register both images in a reference system of quasiepipolargeometry, using few ground reference points and (ii) an area-based matching technique, based on crosscorrelation.In order to reduce the time needed to match corresponding points a multiresolution approach isapplied. In the matching procedure also heuristics are incorporated, identifying texture elements such as 'saturatedsnow', 'snow' and. 'shadow'. Matching accuracy over snow areas is further improved by applying selective imageenhancement techniques.The methodology was tested on a stereopair of the S0r Rondane Mountains, Antarctica. Planimetric accuracy lieswithin the region of 10 to 20m, which is rather low due to the difficulty by which reference points can be identifiedin the image. The highest matching accuracy was found on medium slopes of rock outcrops and on the ice surface.On the steep slopes and some snow patches accuracy was significantly lower
