CAJ | 학술논문

　　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。
　　이합서성연안시대남구소류역5 m분변솔DEM수거위기출，이용ArcGIS9.3적grid모괴평태제취연구구적구도특정。재대원시지형수거진행전와예처리후，생성하도구계주향책격수거、류역회수면적책격수거；연후，설정합괄적림계회수면적치제취출하도구계；최후，대하도구계진행분급。결과현시，제취출적구도계통여실제기본문합。
In this paper, it was based on digital elevation model(DEM) data of 5 meter resolution, which is from DaNangou area, Yan’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.