基于DEM的沟缘线和坡脚线提取方法研究

A DEM Based Method for Extraction of Valley Shoulder Line and Slope Heel Line

提出了一种基于DEM的沟缘线和坡脚线的提取方法,该方法以沟缘线和坡脚线的形态特征为基础。沟缘线作为梁峁地和沟坡地的分界线位于凸坡上,沟缘线象素以下的坡度应大于某一坡度值;坡脚线作为沟坡地和沟底地的交界线位于凹坡上,坡脚线象素以上的坡度应大于某一坡度值;沟缘线和坡脚线上的象素都具有局部最大的坡度变化。利用这种特性进行沟缘线和坡脚线的提取,易于实现。处理的速度快、效率高,提取结果较准确。

The method for extraction of valley shoulder line and slope heel line is based on the shape features of valley shoulder line and slope heel line. Valley shoulder line is the boundary of upland and valley and is located on convex slope. Slope heel line is the boundary of valley slope and valley bottom and is located on concave slope. Both of them are characterized by the biggest local change in slope degree. Using these features in extraction, the method can provide sound flexibility and has high accuracy and high efficiency.