城市高精度DEM生产方法及精度评定

The production of urban high-precision DEM and its accuracy analysis

DEM是表示地面高程的一种实体地面模型,通过有限的地形高程数据实现对地形曲面数字化模拟,可以用一组有限序列的三维向量来表示。文章采用三维激光扫描的方法进行高精度DEM生产,针对高精度DEM生产过程中遇到的点云缺失导致地形特征丢失,采用构建三维线的方法进行解决,最后对其进行精度分析。

DEM is a kind of solid ground model representing ground elevation,it realizes the digital simulation of the terrain surface through the terrain elevation data,which can be represented by a set of 3d vectors with finite sequences.In this paper,the method of 3d laser scanning is adopted to produce high-precision DEM,and the loss of topographic features caused by the absence of point cloud in the production of high-precision DEM is solved by constructing 3d lines.Finally,the precision of the method is analyzed,and the results show that the method can meet the application requirements.