为了绘制大规模地形图，适当地减少数据，利用四叉树结构存储采样点，提出了一种与地形特征和视点相关的实时动态的多分辨率地形模型。在三维场景漫游和切换中，采用二级缓冲机制实现场景数据的快速调度和绘制，同时提出了基于细分评估函数的自适应LOD算法。随着分辨率的动态变化，实时递归地构建绘制当前视域地形所需的数据集。而且在起伏变化大的地形中利用有限的采样点，根据地形特征进行距离加权插值，最终提高特定地区的分辨率和绘制效果。%To draw a large topographic map and reduce data,by using quad-tree structure to store the sampling point,a topographic fea-tures and view-dependent related real-time dynamic multi-resolution terrain model was proposed. In 3D scene roaming and changing,a mechanism of second-level buffering was used for data scheduling and rendering. At the same time,propose the adaptive LOD algorithm based on subdivision evaluation function. With the dynamic changes of resolution,construct recursively the data set that was used to gen-erate required terrain in real time. In order to improve the resolution and drawing effect of a particular region,distance weighting interpola-tion was established with the finite points according to the regional feature.
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