| 三维GIS空间对象层次细节比例变换综合算法 |
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| 引用本文： | 蒋云良,庄越挺,刘勇,罗晓华.三维GIS空间对象层次细节比例变换综合算法[J].计算机辅助设计与图形学学报,2006,18(1):34-40. |
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| 作者姓名： | 蒋云良 庄越挺 刘勇 罗晓华 |
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| 作者单位： | 1. 湖州师范学院信息工程学院,湖州,313000;浙江大学CAD&CG国家重点实验室,杭州,310027;浙江大学人工智能研究所,杭州,310027
2. 浙江大学CAD&CG国家重点实验室,杭州,310027;浙江大学人工智能研究所,杭州,310027 |
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| 基金项目： | 中国科学院资助项目;浙江省自然科学基金 |
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| 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．
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| 关 键 词： | 三维GIS 层次细节比例变换 空间对象综合 选取规则 合并原则 |
| 收稿时间： | 2004-08-13 |
| 修稿时间： | 2005-08-15 |
Spatial Objects Generalization Algorithm in Three Dimension Level of Detail GIS |
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| Jiang Yunliang,Zhuang Yueting,Liu Yong,Luo Xiaohua.Spatial Objects Generalization Algorithm in Three Dimension Level of Detail GIS[J].Journal of Computer-Aided Design & Computer Graphics,2006,18(1):34-40. |
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| Authors: | Jiang Yunliang Zhuang Yueting Liu Yong Luo Xiaohua |
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| Abstract: | An improved R-Tree(IR-tree) strategy of data organization and the corresponding algorithm of generalization in 3D level of detail GIS are presented in this paper.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 the 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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| Keywords: | IR-Tree |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
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