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中文摘要：
为从数字高程模型（DEM）中自动提取区域水流特征，分析了DEM中地形的形态特征，并进行洼地填充和平地抬升的预处理，应用坡面流模拟方法进行了水流方向的确定及水流方向数字阵列的生成，最后根据水流方向阵列和河流栅格网络图生成需要的水系，其结果与手工数字化的水系基本一致，证明该方法是有效的。
英文摘要：
This paper analyzed the terrain characters of topography in the DEM for automatically extracting the characteristics of regional water course, carried out the pretreatment of filling hollow and uplifting flat land in DEM, then, determine the direction of water course and build its digital array with the method of stream simulation, finally, extract the wanted water course on the basis of the array of stream direction and grid networkchart. The experiment results similar to the results by hand have proved that the method of automatically extrating is effective.
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