基于TIN和CSG的三维城市建模方法

Research on 3D City Modeling Method Based on TIN and CSG

目的提出一种基于TIN和CSG的三维城市建模方法,解决我国现阶段"数字城市"的建设需求.方法采用基于半边数据结构的Delaunay三角剖分建模方法,对地形建模;采用CSG建筑物建模方式对建筑物进行建模,并将建筑物模型与地形模型进行匹配.结果由于地形模型与地物模型的几何特性相异,因此对两种模型分别建模,并集成在一起,实现了三维空间有效、完整地表达.结论两种模型有机结合,实现了三维城市中地形和建筑物模型的可视化表达,在三维城市构建方面有很好的应用前景.

The technique of terrain features and terrain geometry modeling is one of the most important research fields in the 3D urban geographic information system. In this paper, we represent terrain features by Delaunay triangulation algorithm base on Half- Edge Data Structure;CSG modeling buildings use methods for modeling of buildings. The building model and terrain geometry model will be matched. The terrain mod- el and the geometric characteristics of topography in the model are different;therefore, two models are mod- eled and integrated separately. An effective and complete expression of 3D space is achieved. Two models are combined to achieve the expression of the terrain and buildings in 3D city model visualization, which has a good application prospect on 3D city building.