ArcGIS中基于 DEM提取沟道特征

以陕西省延安市大南沟小流域5 m分辨率DEM数据为基础,利用ArcGIS9.3的grid模块平台提取研究区的沟道特征。在对原始地形数据进行填洼预处理后,生成河道沟系走向栅格数据、流域汇水面积栅格数据;然后,设定合适的临界汇水面积值提取出河道沟系;最后,对河道沟系进行分级。结果显示,提取出的沟道系统与实际基本吻合。

Channel Characteristics of Extraction Based on DEM in ArcGIS

In this paper, it was based on digital elevation model（DEM） data of 5 meter resolution, which is from DaNangou area, Yah＇an, Shanxi. Using the grid module platform of ArcGIS 9.3, the channel systems of research area was extracted. Raster data of canal direction and watershed water catchment area were formed after the original terrain data were pretreated. Then it set the appropriate critical water catchment area value, and extract- ed the river canal system. Finally, it graded the canal system. The results showed that the extracted channel sys- tem was generally consistent with the actual one.