Layered Representation and Visualization Technique for 3D GIS Model
三维GIS模型的分层表示及可视化技术研究*

On the basis of analyzing present 3 D GIS modeling methods, a layered representation method is put forward in corresponding to features of 3 D data in geology, which can be visualized by OpenGL technique. In this new method, a layered index mechanism for 3D model data structure is established by dynamic discrete network model, so as to establish topological relations for control points automatically. With loading the inner attribute data to 3D solid surface model ,transformation from twodimensional section to 3D solid has been realized. Then ,the modeling system based on OpenGL is adopted to render the established 3D solid model above. Finally, a 3D GIS sinmlation system has been developed, which provides engineers a new operating platform.