Road extraction method in transmission channel in mountainous area

doi:10.13474/j.cnki.11-2246.2021.0119

Abstract

Abstract: Accurate extraction of objects in transmission channels is the basis of three-dimensional modeling and intersection analysis of transmission channels. In order to solve the problems of low robustness and low efficiency of road extraction methods in transmission channels in mountainous areas such as Guizhou, in this paper, the fast and accurate extraction of roads in transmission channels in mountainous areas in images is studied by combining road feature significance detection and morphological constraints. First of all, the road features in the mountain area in the satellite image are analyzed, and the pixel-level significant values based on road color consistency and road structure consistency are calculated for each pixel. And then, combined with the a priori knowledge of significant target space, the saliency detection results are fused to form the final road saliency map, and the road targets in the image are extracted preliminarily. Finally, the differences between roads and buildings are analyzed, the road shape constraints are defined based on the consistency of road shape, and the accurate extraction of roads is realized through the formulation of constraint rules. The results show that the roads with different bending degree, different adhesion degree and different image contrast can be extracted quickly and accurately, and the average extraction integrity, accuracy, quality and time-consuming are 97.5%, 97.0%, 95.6% and 0.515 s, respectively. It can be seen that this method has high robustness, can extract roads in various cases quickly and accurately, and has a good application prospect in transmission line engineering.

Key words: transmission channel in mountainous area, road extraction, structural consistency, color consistency, morphological consistency, pixel significance, morphological constraint

CLC Number:

P237

PENG Chi, MAO Xianyin, YANG Liuqing, MA Xiaohong, Lü Qianyong, DU Hao, WANG Di, YU Rong. Road extraction method in transmission channel in mountainous area[J]. Bulletin of Surveying and Mapping, 2021, 0(4): 105-110,125.

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