利用Voronoi图构建多级TIN

由于地形地貌的复杂性，地形高程点的数据量往往很大。由离散高程点生成的TIN同样也具有相当大的数据量，这严重制约了TIN的分析、三维可视化等处理速度。为此，文中根据LOD的设计思想，采用逐级综合，生成多级TIN。随后，将多级TIN进行合并，统一存储，消除了冗余数据。采用局部更新、分级调用的策略使得处理速度显著提高，且受数据量的影响很小，可以较好地应用在地理信息系统中。

Constructing muti-level TIN with voronoi diagrams

To study the LOD techniques for large scale terrain visualization, this paper focused on the design of muhiresolution TIN. First, a new approach of constructing multiresolution TIN that represents terrain well was given based on Voronoi diagrams and Delaunay triangulation networks. Second, multiresolution TIN was incorporated, thus making the management and load of it even more easily. The results show that the response speed and display effect are very satisfying. It can make real time and seamless walkthrough in large scale 3D visualization.