基于WebGL的高速列车在线运行及沿线虚拟地理环境仿真

Simulation of high-speed train on-line operation and virtual geographic environment along the line based on WebGL

为实现Web环境下构建高速铁路沿线虚拟地理环境,模拟高速列车运行,首先确定多层次虚拟地理环境的语义组织方式并对铁路沿线地形表面进行多尺度数据建模;再基于GIS技术构建场景数据与基础地理数据的发布与分布式存储方案;最终基于WebGL技术提供集成高速铁路轨道、多尺度遥感影像、数字地表模型等多源数据的铁路沿线虚拟地理环境无插件构建方法,并提供列车信息管理及运行仿真方案。以高铁郑西线为案例线路的实践表明:方案考虑多尺度地形与地物建模、网络环境下大场景渲染、复杂地形的高效率可视化等问题,实现了铁路沿线虚拟地理环境构建和列车运行仿真,对高速铁路列车运行仿真有重要参考价值。

The virtual geographical environment of the high-speed railway was built under the Web environment,and the operating of trains was simulated.Firstly,the semantic organization of multi-scale virtual geographic environment was determined,and terrain surface along the railway was deployed with multi-scale data.Then,the solution of releasing basic geographic data and the scene data into distributed storage scheme based on GIS technology was proposed.Finally,a non-plug-in construction method for virtual geographic environment along the railway was provided based on WebGL,which integrates high-speed railway tracks,multi-scale remote sensing images,digital surface models and other multi-source data.The management and simulation tools of railway information were also developed.The realization of the high-speed railway of Zhengzhou-Xi’an line shows that this method takes multi-scale terrain and ground object modeling,large scene rendering in web environment and high-efficiency visualization of complex terrain into consideration.The virtual geographic environment along the railway is built and the train running simulation is provided,which values a lot for the reference of high-speed railway train running simulations.