基于三维大场景的铁路线路方案优化技术研究及应用

Research and Application of Railway Route Optimization Technology Based on 3D Large-scale Scene

随着正射影像采集、无人机倾斜摄影、点云激光扫描等技术的发展,在GIS平台中构建三维场景的方法日趋成熟,现有的数字化选线软件多为图形、数据分离的二维设计软件,在GIS平台下开发的具备符合线路设计业务且勘察设计流程的软件较为欠缺,因此,从统筹规划、数据筛选和利用服务进行铁路选线的角度出发,开发GIS平台下的人机交互线路方案优化功能势在必行。将目前三维GIS领域的新技术应用于系统开发中,结合铁路选线的常规调整优化作业流程,提出基于GIS三维大场景中的线路方案优化流程、三维单一及二、三维组合场景下的线路方案优化方法。通过集成线路表达参数、平面交点、断链、纵断面等线路走向控制数据,对优化区域内的线路方案进行空间变换及同步调整,为线路设计提供更加直观、全面的环境信息,以及与之契合的线路空间实体。在铁路大场景系统中开发线路方案优化模块,通过对2.3 km线路方案进行功能应用,验证了本文所提方法的科学性和实用性。

With the development of orthographic image acquisition,oblique photography,laser point cloud scanning and other technologies,the methods of constructing three-dimensional scenes in GIS platform are becoming more and more mature.The existing railway location software is mostly twodimensional design software with graphics and data separation,and the software developed under GIS platform with line design business and survey and design process is relatively insufficient.Therefore,from the perspective of overall planning,data screening and railway location by service,it is imperative to develop the optimization function of route scheme of human-computer interaction under GIS platform.The new technology in the field of three dimensional GIS is applied in the system development,and combined with the regular routine of adjustment and optimization about railway location,the optimization process of route scheme based on GIS in the three dimensional large-scale scene and the optimization method of route scheme in the three-dimensional or combination scenes are proposed.By integrating the expression parameters of railway route and the control data of the railway route alignment such as plane intersection points data,line breakage data,vertical section data and so on,the route scheme in the optimized area is transformed and synchronously adjusted,providing more intuitive and comprehensive environmental information for the route design as well as the spatial entity that fits with it.The optimization module of the route scheme is developed in the railway large-scale scene system,and the functional application of the 2.3 km route scheme verifies the scientificity and practicability of the proposed method.