面向多样化终端的自适应网络三维可视化方法

随着移动互联网的快速发展，三维GIS （geographic information system）应用的用户终端设备类型日趋多样化，现有单一的网络可视化方法难以适应多样化终端需求.针对上述问题，本文首先设计了基于B/S （browser/server）模式的自适应三维可视化架构，然后重点探讨三维数据的多样化组织、自适应四叉树组织与动态索引构建、三维场景自适应调度等关键技术，最后基于WebGL技术构建原型系统并进行案例实验.实验结果表明:桌面端设备笔记本电脑的可视化渲染帧率最终稳定在40 帧/s左右；移动端设备平板电脑、智能手机的可视化渲染帧率最终稳定在20 帧/s左右；不同类型终端上进行网络可视化均能保证较高的可视化帧率及效果，证明了本文提出方法的有效性与可行性. 

Adaptive Web 3D Visualization Method for Diverse Terminals

With the rapid development of mobile Internet, terminals of 3D GIS (geographic information system) applications have become more and more diverse. The current web visualization methods can hardly meet the requirements of diverse terminals. To solve this problem, an adaptive visualization architecture based on the B/S (browser/server) model was designed. Then some key technologies were explored, such as the diverse organization of 3D data, adaptive quad-tree organization, construction of dynamic index and adaptive scheduling of 3D scene. Finally, a prototype system was developed on the basis of WebGL. The experimental results show that the rendering frame rate of the laptop computer is eventually stable at more than 40 frame per seconds, that of the smartphone and tablet computer is eventually stable at more than 20 frame per seconds, and web visualization on diverse terminals can be ensured with high visual efficiency and effects, thus demonstrating the effectiveness of the proposed method.