分形内插与DELAUNAY三角网结合的三维地形可视化数据模型

3-D Terrain Visualization Model Based on the Combination of Fractal Interpolation and Delaunay Triangulation

为了有效地实现ＧＩＳ分析中地形数据的可视化，本文提出了分形内插与Ｄｅｌａｕｎａｙ三角网结合的三维地形可视化数据模型。该模型不仅能满足几何精度，保持地形特征，而且具有表面质感理想的可视化效果。该模型的空间分辨率可以由尺度、位置和时间参量来调节，具有多尺度表达、局部加密表达和时空动态表达的特点。该模型适于ＧＩＳ的可视化操作与分析。

To efficiently implement the visualization of terrain data in GIS,a vi-sualization model of 3-D terrain based on the combination of fractal interpolationand Delaunay triangulation is proposed.By means of the model,not only the geo-metry accuracy can be satisfied and the characteristic of terrain are preserved,butalso the textures of terrain surfaces are nicely visualized.The spatial resolution ofthis model can be arbitrarily controlled by the scale,location and temporal parame-ters.The model is suitable for GIS visualization data handling and analyzing.