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中文摘要：
提出了一种基于改进的Reactive-Tree数据结构的空间地理信息数据组织策略Improved Reactive-Tree（简称IR-Tree）及其相关算法，该算法在预处理中建立基于三维空间对象静态质量的IR-Tree；然后在具体的三维GIS场景绘制过程中，根据不同的视点和视角计算考虑当前视距的空间对象动态质量，从而调整空间对象的优先级顺序；再通过文中算法2和算法3动态地计算和输出当前比例和视点下的空间形体，实验结果表明：考虑视点因素的层次细节比例变换算法能取得更好的显示效果，从而满足当前三维GID应用的需求．
英文摘要：
An improved R-Tree （IR-trec） strategy of data organization and the corresponding algorithm of generalization in 3D level of detail GIS are presented in this papcr. This algorithm builds the IR-tree based on the static qualities of spatial objects firstly, and then re-calculates the dynamic qualities of these spatial objects by the current distances of the viewpoint, resorts the objects list, and outputs lhe spatial objects based on the current scale and viewpoint dynamically by the algorithm 2 and algorithm 3 introduced in the paper. Experiments show that the algorithm could achieve more accurate display results and meet the current requirements in 3D GIS applications.
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