空间剖分提取山顶点的方法

Method of Peak Extraction Based on Spatial Subdivision

山顶点作为重要的地形特征要素,其提取方法一直是数字地形分析的重要研究内容之一。此处将水文模拟提取归结为空间剖分的一种,将山顶控制范围作为山顶提取的空间分布约束条件,提出一种基于空间剖分原理的山顶点提取方法。该方法根据山顶地形形态特征,分别通过水文模拟分析、等高线剖分来获取山顶影响区域与候选控制范围,通过确定山顶适宜控制范围来提取山顶点。以开县地区作为实验样区,通过该方法所得山顶点空间分布结果合理,符合传统山顶认知和地形形态特征。

As peak is the important feature element, the approach to extracting peaks is one of the significant stud- ies in DTA. In this paper, hydrologic analysis can belong to spatial subdivision. A new automatic approach to ex- tracting peaks was proposed on the basis of the spatial subdivision and the suitable controlled area of peak. Consid- ering morphological characteristics of peaks, the affected areas of peaks were extracted by hydrologic analysis, and the controlled areas were extracted by horizontal subdivision using contour lines. Then the peaks were extracted based on the suitable controlled areas. A sample area in Kaixian has been given. The peaks extracted by the new approach proposed in this paper conform with the cognition and morphological characteristics of peaks.