| 基于格网划分的海量地形数据三维可视化 |
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| 引用本文： | 胡金星,马照亭,吴焕萍,潘懋. 基于格网划分的海量地形数据三维可视化[J]. 计算机辅助设计与图形学学报, 2004, 16(8): 1164-1168 |
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| 作者姓名： | 胡金星 马照亭 吴焕萍 潘懋 |
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| 作者单位： | 上海交通大学电子信息与电气工程学院,上海,200030;上海通用卫星导航有限公司,上海,200040;北京大学地球与空间科学学院,北京,100871 |
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| 基金项目： | 国家“八六三”高技术研究发展计划 ( 2 0 0 1AA13 5 180 )资助 |
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| 摘 要： | 首先按照格网划分方式对研究区域进行分割，采用与视点相关的静态LOD模型，在格网块内以四叉树进行管理，根据误差以二元三角树方式进行LOD模型预处理，并采用三角形条带进行若干不同层次的LOD模型文件组织；然后按照格网块进行视景体投影裁剪，结合动态内存调用、多线程管理的数据引擎方法以及视觉光滑处理，实现了海量地形数据的三维可视化及漫游．实验结果表明，文中算法具有处理数据量无限制、效率高、效果好等特点．
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| 关 键 词： | 数字地形模型 三维可视化 漫游 细节层次模型 格网划分 |
3D Visualization of Massive Terrain Data Based on Grid Partition |
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| Hu Jinxing ,) Ma Zhaoting ) Wu Huanping ) Pan Mao ) ). 3D Visualization of Massive Terrain Data Based on Grid Partition[J]. Journal of Computer-Aided Design & Computer Graphics, 2004, 16(8): 1164-1168 |
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| Authors: | Hu Jinxing ) Ma Zhaoting ) Wu Huanping ) Pan Mao ) ) |
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| Affiliation: | Hu Jinxing 1,2) Ma Zhaoting 3) Wu Huanping 3) Pan Mao 3) 1) |
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| Abstract: | A 3D visualization and roaming algorithm of massive terrain data based on grid partition, dynamic RAM and view dependent static LOD model is presented. Area of interest is first subdivided into hierarchical quadtree of square zones. According to the predefined approximation errors of LOD, each quadtree is preprocessed into binary triangle tree and stored as LOD model data files in the form of triangle stripes. View frustum projection culling, data engine of dynamic RAM with multi-thread management and geomorphing are applied to realize 3D visualization and roaming of terrain. Experimental results show that the data processing capacity is unlimited with high efficiency and good effect. |
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| Keywords: | digital terrain model 3D visualization roaming level of detail model grid partition |
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