基于三维城市GIS的交互式三维隧道建模算法

为了建设城市地下空间三维GIS，解决城市地下隧道的三维建模问题，提出一种基于三维城市GIS的交互式三维隧道建模方法，详细讨论了交互式三维隧道建模的各个步骤以及交互控制、空间计算和三角剖分等算法，并以一个正在开展的三维城市GIS项目为基础，介绍了交互式三维隧道建模方法的应用。实践证明，交互式三维隧道建模方法相比传统方法操作更为方便，能够提高城市地下空间三维GIS的工作效率。交互式三维隧道建模方法将为基于三维城市GIS技术的城市空间信息化工作提供重要的技术支撑。

Implementation and application of interactive 3D tunnel modeling method based on 3D urban GIS

The 3D urban GIS is an important technology for promoting the city informatization. 3D Modeling is an indispensable function of 3D urban GIS, and also one of the incompletely resolved problems. There is no universal 3D Modeling method which can be used to solve the 3D Modeling of all the spatial objects in the real world. To build an urban underground space GIS and to solve the 3D Modeling of the subsurface tunnels, an interactive 3D tunnel modeling method was proposed based on 3D urban GIS, in which the interactive modeling steps and related implementation algorithms such as interactive controlling, spatial computing, triangulation and so on were discussed in detail. An on going 3D urban GIS project was introduced in which the above mentioned modeling method was applied. The practice proves that the interactive 3D tunnel modeling method is more convenient than the traditional methods in operation and can improve the work efficiency of urban underground space 3D GIS. The interactive 3D tunnel modeling method provides significant technical support for GIS based city informatization.