DEM地形描述误差空间结构分析

An investigation of the spatial structure of DEM errors

首先提出 DEM( Digital Elevaion Model)地形描述误差的提取方法 ,通过误差地图以及量化研究方法 ,揭示 DEM误差的空间分布规律。试验结果显示 :误差地图是实现 DEM误差可视化的有效方法 ;DEM地形描述误差具有很强的空间自相关性 ,自相关值随地形复杂度与 DEM分辨率的改变而有规律地变化。

Digital Terrain Models are one of the key data set in the database of geographical information system.However,the existence of DEM errors influence the accuracy of spatial analysis results.The method of deriving DEM terrain representation errors is put forward first,then,the spatial distribution of DEM error with both visualization and quantification approaches are investigated.The results of this experiment account for that error maps can visually and effectively show the spatial distribution of the errors.DEM terrain representation errors are strongly autocorrelated and varies along with the variation of terrain types and DEM resolutions,which provides a significant basis for the mathematical simulation of DEM errors.