A method for computer extraction of geological lineaments from LANDSAT images is presented. The variance thresholded map of each image is separated into eight gradient direction maps, where basic linear segments are determined each of which is based on the principal eigen vector of a cluster of pixels whose gradient direction is orthogonal to its orientation. A special linking algorithm operates on the basic linear segments to give a candidate lineament segment. The method has been experimented on LANDSAT images of a small region southwest to Pittsburgh. The preliminary result is encouraging and further work for improvement is suggested.
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