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用于地面可视化的DEM四叉树改进

郝鹏威1, 黄波1, 朱重光1(中国科学院遥感应用研究所,北京 100101)

摘 要
四叉树表示在数字高程模型(DEM)的压缩存储和地面可视化中占有非常重要的地位E此文吸收了DEM普通四叉树表示和塔形分层表示的优点,提出了一种改进的四叉树结构。它主要是在结点的数据域中增加了高程最大值和最小值项,并把四叉树线索化了。经过改进的四叉树结构使DEM在地面可视化中进行的光线追踪时,光线追踪效率得到了提高。
关键词
An Improved Quadtree of DEM for Terrain Visualization

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Abstract
Quadtree representation of DEM is of importance in DEM compression and terrain visualization. An improved quadtree is proposed.which has the advantages of both an ordinary quadtree and a pyramidal structure. Each node of the improved quadtree is added with a maximum height value and a minimum height value,and the whole quadtree is threaded,thereby making raytracing efficient in terrain visualization.
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