基于DEM提取黄土丘陵区沟沿线

Thalweg in Loess Hill Area Based on DEM

黄土丘陵区的沟沿线,是反映该区地形地貌特征的重要的地形结构线。以陕北绥德县韭园沟流域为实验样区,探讨利用数字高程模型(DEM)实现自动提取沟沿线的原理方法,并以航片及地形图等高线为依据,对所提取沟沿线的精度进行了对比分析。实验结果证明,利用DEM自动提取沟沿线是一种快速、有效的技术方法。

The thalweg in loess hill area is an important terrain structural line, reflecting topography and landform character. A case study is conducted in Jiuyuan valley of Suide county, north Shaanxi province. The principles and methods of distilling automatically thalweg are discussed in the context of a DEM, and the precision of results relative to charts and terrain maps is analyzed. The study shows that the technology and method of distilling the thalweg using DEM are practical and effective.