利用DEM自动识别河道断面

Deriving the Fluvial Cross Section from DEM Based on Automatic Recognition

在分析了传统河道断面提取方法后,以数字清江项目为例给出了一个基于数字高程模型(DEM)数据的河道断面提取方法,利用DEM数据中丰富的地面坐标和高程信息,自动识别河道断面方向并提取断面数据,整个过程主要由计算机进行处理,人工干预少,效率高。

After analyzing the traditional method of getting the cross section of river, a new method is expatiated, which is based on DEM（Digital Elevation Model） and has been used in Digital QingJiang. The DEM data contains abundant three- dimensional information of terrene, it can be used＇by co.mputer to recognize the direction of the fluvial cross section and achieve the information of cross section. The new method is roboticized and efficient with little manpower.