摘要
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。
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 derived from the differences among algorithms the software used, and the differences of the DEMs have their spatial distribution rule and the characteristics in which the negative difference of elevation is more than the positive one. The following conclusions are then elicited ： the algorithm TIN has advantage in generating high-precision DEM, and the algorithms LRS and Non-LRS have advantages in creating simple - structure DEM. When 3D display and earthwork calculation are to be requested, the algorithm TIN shall be selected, and when checking the elevation data errors, to choose the algorithms LRS or Non-LRS will be proper.
出处
《计算机应用与软件》
CSCD
2009年第1期88-90,共3页
Computer Applications and Software
基金
陕西省自然科学基金项目(2005D14)。
关键词
数字高程模型
算法
三角形不规则网
线性橡皮拉伸
非线性橡皮拉伸
Digital Elevation Model Algorithm Triangular inegular network Linear rubber sheeting Non-Linear rubber sheeting
