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.