基于可变窗分析的中国云贵高原地区SRTM DEM数据填补方法研究

从分析在云贵高原地区具有广泛用途的SRTM DEM的优缺点出发,在总结了已有SRTM DEM缺数据区域填补方法的基础上,提出了基于可变窗分析、回归分析与反距离平方权逐层插值相结合、以Aster GDEM为辅助数据的填补方法,并详细阐述和实现了该方法.用云贵高原地区10个典型缺数据区域进行实验.实验和结果的比较分析表明,该方法具有自适应性,精度较高,能适合于填补我国云贵高原地区的SRTM DEM.

A new method of patching SRTM DEM void data which is suitable for Yunnan-Guizhou plateau in China and based on variable windows

In this paper,the advantage and disadvantage of SRTM DEM data were briefly introduced at first.After reviewing many methods in literature,a new method which is based on a variable size window,includes correlation analyze and Inverse Distance Weight and using Aster GDEM as an auxiliary data is proposed and then implemented.An experiment with 10 blocks of void data which include simple and complex terrain in Yunnan-Guizhou Plateau is tested.The results suggest that the method can accurately reproducethe elevation in blocks with different terrain,and it can be widely used to patch SRTM DEM data in Yunnan-Guizhou Plateau in China.