A method of extracting linearments from topographic and gravity data.

概要

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A trial on line extraction from the digital terrain model (DTM) is performed by using a method which is generally used for processing digital pictures. It consists of the following steps; (1) extracting feature points like edges and bounderies from a grey picture by applying the Laplacian operator of 4x4 elements, (2) reforming a binary picture whose points have the gradation greater than a certain threshold value, (3) reforming a line pattern by the thinning algorithm with properties of connected components, (4) detecting straight lines in a digitized image by the Hough transformation. This method replaces an original problem of finding collinear points in picture space by a mathematically equivalent problem of finding concurrent lines in parameter space . Most of the lineament spicked up from DTM of the Iida district and from Bouguer anomaly in the Suwa basin show relatively good agreements with the distribution of active faults. In conclusion, the Hough transformation can detect lineaments efficiently from a complex map.
日本測地学会の論文