基于均值变点分析法的地形线提取研究

Research on Terrain Line Extraction Based on Mean Change Point Analysis

地球表面的形态各式各样,山脊线和山谷线是典型的地形特征线,其构成了地形起伏变化的分界线,在地学研究、水文分析、地理信息系统建设、地图制图等方面都有着重要应用。文章基于地表流水物理模拟方法,在提取正负地形时采用均值变点分析法来进行邻域窗口的选择,根据不同窗口地形信息差异的最大值来确定最合适的窗口大小,减小对地形线提取精度的影响。利用实际数字高程模型实验验证了该方法的可行性,实验结果表明该方法提取的正负地形更加完整。

The terrain of the earth surface is various.Ridge lines and valley lines are typical terrain feature lines,which form the boundary of topographic relief changes.They have important applications in geoscience research,hydrological analysis,geo-information system construction,mapping and other aspects.In this paper,based on the physical simulation method of surface water flow,the mean change point analysis method is used to select the neighborhood window when extracting positive and negative terrain,and the most appropriate window size is determined according to the maximum difference of terrain information in different windows to reduce the impact on the accuracy of terrain line extraction.The feasibility of this method is verified by the actual DEM experiment,and the experimental results show that the positive and negative terrain extracted by this method is more complete.