基于机载激光雷达数据的DEM获取及应用

DEM Extraction and Its Application Based on Airborne Lidar Data

作为直接获取对象表面点三维坐标的现代对地观测技术,激光雷达技术能够快速获取高精度地面高程模型。基于Lidar系统所获取的点云数据,通过过滤处理将区域纯地形特征信息与地物信息相分离,最终生成高精度的DEM,并在此基础上对同步获取的数码影像进行了正射纠正,为进一步的信息提取、定量分析及实体建模奠定基础。

As a modern global observation technology which can obtain the three-dimensional coordinate of surface of objects directly, Lidar （light detection and ranging）remote sensing can extracted Digital Elevation ModeI（DEM） quickly. In the study, the point--clouds data from Lidar system were filtered and classified to separate the information of pure terrain from that of the objects, DEM was extracted and then the orthophoto map for Aerial Photos which were simultaneous with the Lidar data were produced. It will be based for information acquisition, quantitative analysis and substantiality modeling in further research.