中文摘要：

平原地区的河网提取一直是基于数字高程模型（DEM）的水系提取的难点。尝试利用主干河流修正不规则三角网（TIN）,以提高DEM平原地区地形模拟的精度（基本方法为利用已存在的主干河流线,对其所经区域进行高程赋值,约束TIN的构建,然后进行DEM模拟）,基于此进行平原区河网提取。实验表明,此种方法下,平原区提取的主干河流与实际河流有较大的吻合。

英文摘要：

Plain drainage network extraction has always been a tough task in the river system extracting based on the Digital Elevation Model（DEM）.In this paper we tried to imbed the stem river in the TIN and thus to improve the precision of the DEM.Based on this improved DEM,we tried to extract the river system in the plain.The results show that the extracted river system fit well with the actual river network by this method.