中文摘要：

讨论了平坦地区根据影像匹配的结果将DSM修正成DEM的方法,针对平坦地区一般都有建筑物和树木,利用其本身的地形特点,提出附近最小值方法自动修正DSM以获得近似正确DEM的方法。并对试验结果的精度进行了检查,发现试验的结果比影像匹配后的结果要精确许多,将建筑物和树木等植被的高程去掉,得到比较精确的DEM数据。

英文摘要：

This paper discusses the method of correcting DSM to DEM in flat area based on the result of image matching. There are buildings and trees in flat area. Therefore, according to the topographical features of the flat region itself, the near the minimum method that amend DSM automatically to obtain approximate DEM is put forward. It also testified the accuracy of the experiment. The result shows that the accuracy of the experiment is much higher than the result after image matching. It can remove the elevation of the buildings and trees and then obtain relatively accurate DEM.