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虚拟高速铁路场景能够直观地表达线路实体及其周围的地形地貌,为高速铁路相关的管理决策和科学实验提供支持。针对高速铁路空间数据的线性分布特征和地物对象结构固定的特性,本文提出了基于线性参照系统的虚拟高速铁路场景建模方法。将高速铁路对象抽象和简化为可重复利用的模型,并使用线性参照工具进行模型的空间定位,以实现虚拟高速铁路场景的构建。本文首先探讨了高速铁路线路和线性参照系统的特点;然后,详细给出了构建虚拟高速铁路场景的流程、模型属性表和事件表的设计,以及几何约束方法;最后,选择案例区域开展试验。结果表明,该建模方法将建模对象以事件表的形式进行空间定位,减少了计算复杂性,并将属性数据与虚拟场景对象进行联接,可用于高速铁路的可视化管理和科学分析。
The virtual high-speed railway scene can intuitively express the topography of the line entity and its surroundings, and provide support for the management decisions and scientific experiments related to high-speed railway. In view of the linear distribution characteristics of high-speed railway spatial data and the fixed features of object structure, this paper presents a method for scene modeling of virtual high-speed railway based on linear reference system. The high-speed railway objects are abstracted and simplified into reusable models, and linear referencing tools are used to locate the model space in order to realize the construction of virtual high-speed railway scenes. In this paper, the characteristics of high-speed railway lines and linear referencing systems are firstly discussed. Then, the process of constructing virtual high-speed railway scenes, the design of model attribute table and event table, and the geometric constraint methods are given in detail. Finally, the case area is selected for testing. The results show that the modeling method locates the model objects in the form of event table, reduces the computational complexity, and joins the attribute data with the virtual scene objects. It can be used for the visual management and scientific analysis of high-speed railway.