基于Internet的大规模城市建筑三维场景可视化研究

Research on Browsing Large Scale 3D Scene of City Buildings over Internet

城市场景的构建是数字城市的基础。在互联网上实现大规模城市建筑物场景实时绘制,受到带宽瓶颈及三维可视化海量数据吞吐量的限制。通过分析其特点后,设计了适合网络传输的三维模型数据结构和充分考虑可视化效率的系统服务架构,提出了完全层次四叉树与集合的混合结构的数据组织模型,分析和论证了构建模型依据和方法。然后,讨论了建筑物场景的调度策略和方案。开发了虚拟地球平台GeoGlobe并运用于两个应用系统。实验和应用结果表明,能在普通PC机上实现大规模建筑物场景的流畅调度、实时浏览,可视化效果和用户体验好。

The construction of urban scenes is the basis of Digital City. The bandwidth bottleneck of network and huge volume data throughput of 3D visualization, restrict the real time visualization of large scale city buildings scene on internet. After analyzing the characteristic of 3D visualization online, the system architecture was proposed, a 3D model data structure for network transmission was designed, and a data organization model that mixed full level quadtree and set structure was proposed also. Then, the project and strategy for managing models scene were discussed. Based on above methods, virtual earth platform ＂GeoGlobe＂ and two applications were developed. Experiment and application results show that the visual effect and user experience are good when real-time browse large-scale buildings scene works on ordinary PC.