TIN结构多分辨率地形三维可视化模型建立关键技术

摘要

运用Quadtree算法将整个区域的DEM数据进行静态分块,对各个子块分别构造TIN,通过VDPM简化算法将TIN简化生成不同分辨率的层次模型,最后应用四叉树算法建立有效的空间索引模型,实现显示时的动态调度.当视点位置改变时,实时调整四叉树结构,从而实现地形的实时可视化.多分辨率LOD算法不仅能简化数据,还能使三维视觉效果更接近真实地形状况.%The quadtree algorithm is applied to separate the entire region of DEM data into static block, and construct TIN for various sub-blocks. By using VDPM, the simplified algorithm (it has simplified the creation of hierarchical model with different resolution from TIN. Then the quadtree algorithm is applied to establish an effective spatial index model to display dynamic scheduling. When the viewing position changes,the quadtree structure could be adjusted in real time in order to achieve real-time visualization of the terrain. Multi-resolution LCD algorithm can not only simplify the data,but also make the three-dimensional visual effects closer to the real terrain.