基于虚拟地理环境的铁路数字化选线设计系统

为了在逼真显示的三维地理环境中实现铁路三维实体选线设计,研制了一个基于虚拟地理环境的铁路数字化选线设计系统.该系统集成空间信息技术、数字摄影测量技术、地理遥感技术、虚拟现实技术以及计算机仿真技术,基于航测影像信息和卫星遥感信息,建立了一个逼真显示的铁路虚拟地理环境;采用BIM(building information modeling)技术,构建了铁路构造物基元模型库;通过调用库中的实体基元模型,实时构建方案线三维模型,并在三维环境下对其进行检查修改,比选不同结构类型,实现三维实体选线设计.系统在中老铁路勘测设计中进行了实例验证,结果表明:该系统能够让选线工程师在室内环境下模拟现场实景分析和踏勘,能快速构建方案线三维实体模型,具有方案线比选直观等特点,能满足环境选线、重大工程优先选址选线、海外铁路选线的需求. 

Digital Railway Location System Based on Virtual Geographic Environment

To realize the railway location design with 3D entity in a vivid 3D geographic environment, the digital railway location design system based on virtual geographic environment was developed.Integrating space information technology, digital photography measurement technology, geographic remote sensing technology, virtual reality technology and computer simulation technology together, based on aerial image and satellite remote sensing information, the system establish a virtual geographic environment for railway. BIM (building information modeling) technology was used to set up a library for primitive models of railway structures. The railway location design in 3D entity is realized by calling 3D primitive models in the library, building 3D models for railway schemes in real time, inspecting and revising the schemes in 3D environment, comparing and selecting different structural types. The system was verified in the survey and design of China-Laos Railway project. The results show that engineers can simulate the real site analysis and survey indoor through the system. The system is featured with quickly seting up 3D models for railway schemes and intuitive comparison and selection. It can meet the demands of environment, major projects and oversea railways location.