面向地理实体的三维地形构建技术研究

Research on 3D Terrain Construction Technology for Geographical Entity

地理实体与三维场景是实景三维建设中的两个重要对象,其成果均需搭载在三维平台里进行展示与分析应用,两者在三维空间无缝套合是实现实景三维空间优化展示与精确分析应用的基础,提出以机载点云为主要数据源,并提取建筑物等地理实体的底部轮廓线,参与点云的融合计算并构建DEM,将DEM叠加正射影像来表达三维地形,介绍了机载点云滤波、分类的关键步骤,以及基于分类后的地面点云融合地理实体特征线构建DEM的方法,为类似实景三维建设项目提供借鉴经验。

Geographic entities and 3D scenes are two important objects in the construction of real 3D. Its results need to be carried in a 3-dimensional platform for display and analysis and application. The seamless integration of the two objects in 3D space is the basis of realizing the real 3D space optimization display and accurate analysis application. Taking the airborne point cloud as the main data source, and extract the bottom outline of geographical entities such as buildings, to participate in the fusion computing of the point cloud and build the DEM. DEM superimposed on real projective images to express the 3D topography. The key steps of airborne point cloud filtering and classification are introduced, And also the method of constructing DEM based on the classified ground point cloud fusion geographic entity feature line is introduced.This paper provide reference and experience for similar real 3D construction projects.