| 摘要: |
| 基于空间数据库技术提出了一种多比例尺下细节层次可视化的实现机制.通过建立V-R eactive树索引结构,可以表示不同的细节层次,同时集成了实现多比例尺综合技术.通过采用透视查询算法,简化了该机制实现的复杂度.根据三维可视化的特点,对V-Reactive树进行优化,增强了图像质量.实验结果表明,该机制适用于具有海量数据的三维GIS中. |
| 关键词: 三维GIS 细节层次 多比例尺 空间数据库 三维可视化 |
| DOI： |
| 分类号: |
| 基金项目:国家863高科技发展计划资助项目(863-306-ZD09-02-4) |
|
| A Mechanism of Implementing Visualization with Level of Detail at Multi-Scale |
|
LI Jun,JING Ning,SUN Mao-yin
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| Abstract: |
| In this paper, a mechanism of implementing visualization with level of detail (LoD) at multi-scale is proposed on spatial database. Based on the spatial index V-Reactive tree, different LoDs can be represented, at the same time generalization at multi-scale can be implemented. Furthermore, the perspective query algorithm can decrease the complexity of implementing the mechanism. According to the characteristics of 3D visualization, the index tree is optimized for better image quality. The experimental results show that the mechanism is fit for 3D GIS applications with mass data. |
| Key words: D GIS level of detail multi-scale spatial database 3D visualization |
