矢量数据构建DEM方法及精度分析

DEM construction method of vector data and its accuracy analysis

本文通过某海深图的矢量化,简单介绍了地形点矢量过程和属性数据提取方法,及利用自然邻近法、反距离加权法、克里金法三种插值方法构建DEM仿真地理表面模型的文本数据,并用VB简单编程实现统计分析DEM精度。分析结果表明:DEM精度随着离散点数量、插值方法的不同有所不同,标准差精度可达到亚分米级。

Through the vectorization of a sea depth map, this paper made a brief introduction on the topographic vec- tor and attribute data extraction method. Using NNI（natural neighbor point） method,IDW（inverse distance weigh- ting） method and Kriging method, we can build DEM simulation geography model of text data, and get the accuracy data of DEM by VB programming. Analysis results show thatthe accuracy deviation of DEM can reach sub decimeter level with different number of discrete points and different interpolation methods.