不同算法下生成的数字高程模型对比分析研究

目前数字高程模型的生成在大多数商用地理信息系统软件或遥感图像处理软件中都能实现,但提供的算法有所不同.结合目前常用专业软件提供的不同算法,对同一数据源的高程数据分别生成数字高程模型(DEM),进行对比分析后发现:使用现有专业软件生成的DEM均存在着差异,这些差异主要来源于不同软件采用的算法差别,并且DEM的差异具有空间分布的规律性和负高差多于正高差的特点.由此得出以下结论,TIN算法具有生成的DEM精度高等优点,LRS和Non-LRS算法具有生成的DEM结构简单等优点.若要进行三维显示、土方量计算等,则选择TIN算法生成;若要检查高程数据错误,则选择LRS或Non-LRS算法生成.

ON COMPARATIVE ANALYSIS OF DIGITAL ELEVATION MODELS GENERATED BY DIFFERENT ALGORITHMS

At present,most of the commercial software including GIS(Geographic Information System) and RS(Remote Sensing) can generate DEM(Digital Elevation Model),but are in different algorithms.Using these algorithms offered by existing common professional software,in this paper it has created related DEMs respectively with the data from the same source,and has made the comparative analysis on them,the results are as follows.There are differences in the DEMs created by existing professional software,which mainly der...