Automatic extraction of lineaments based on wavelet edge detection and aided tracking by hillshade

Publication date: Available online 4 October 2019Source: Advances in Space ResearchAuthor(s): Junlong Xu, Xingping Wen, Haonan Zhang, Dayou Luo, Jinbo Li, Lianglong Xu, Min YuAbstractLineaments refer to the linear or curvilinear textures on remote sensing image, whose general spatial distribution characteristics are often the response of deep crustal structures at the surface. Firstly, we use wavelet modulus maxima transformation to detect the edges with 4 scale on Landsat - 8 OLI B5 image and analyze their multi-scale characteristics. As the result, it is determined that the optimal scale of edge detection is 4, and the outline that consist of the edge pixels is roughly corresponding to the geological structure of mine area. Thus the incomplete lineaments have been extracted by using the 2D otsu algorithm. Secondly, the hillshade map generated based on DEM is processed to generate binarized linear shadow. Finally, the linear shadow is superimposed on the lineaments preliminarily extracted to obtain the optimized lineaments. Experiment results show that, based on the method, there will be some deformation and displacement between the lineaments extracted and the actual geological structure, and it fail to effectively extract the Qilinchang Fault, but lineaments are in good correspondence with Kuangshanchang Fault, Dongtou Fault and Niulan River Fault, which are basically in accord with the geological structure framework of the mine area.

Source: Advances in Space Research - October 8, 2019 Category: Science Source Type: research