多角度地形断面与地形结构特征相结合的山谷山脊线提取

Extraction of Valley Line and Ridge Line Combined Multi-angle Terrain Section with Terrain Structure Characteristics

断面分析法是一种常用的从数字化地形资料中自动提取山脊线和山谷线的方法,但此方法在提取过程中容易产生遗漏现象,主要原因是算法对方向的依赖性所致。针对此缺点,利用多角度地形断面高程极值以及基于地形结构的定性定量判断的方法进行提取,能够较好地兼顾整体和细部的山谷线或山脊线。

The extremum method of terrain section elevation iscommonly used to extract ridge line and valley line automatical-ly from digital terrain data,but it is prone to omission phenome-non in the process of when extracting,the main reason is thatthe algorithm depends on the directions. Aiming at this disad-vantage,extraction with extremum method of multi-angle ter-rain elevation and the mothod of qualitative and quantitativejudgment based on terrain structure can better balance the en-tirety and the details of valley line and ridge line.