ANUDEM和TIN建立DEM算法比较

The Comparison of Method for Establishing DEM with ANUDEM and TIN

本文利用等高线和高程点作为高程信息，利用水系作为辅助信息，使用ANUDEM和由TIN建立DEM两种方法建立DEM，并用派生等高线、提取水系和生成山体阴影模型对两种方法生成的DEM质量进行比较。实验结果表明，由ANUDEM方法得到的DEM光滑连续，克服了由TIN造成的平三角形和阶梯地形的现象，并且由ANUDEM方法得到的DEM具有正确的水文地貌关系。因此，ANUDEM是一种更加优秀的DEM插值算法，在实际工程应用中具有很大价值。

In this paper, DEM, which made use of the contours and elevation points as elevation information and the water system as assistant information, was established with ANUDEM and TIN method. And then, the quality of the two DEMs established with the two different methods was compared using the contours derived from DEMs and the water system extracted from DEMs and lighting model derived from DEMs. The experiment result indicated that, the DEMa （ DEM established with ANUDEM method） was more smooth and continuous than the DEMt （ DEM established with TIN） , there was no plane triangle and stepladder topography in DEMa, and the DEMa had the correct relationship between hydrology and topography. It was concluded from the paper that ANUDEM is a more excellent method for establishing DEM, and it is of great value in engineering application.