关键词: 三维建模, 高速铁路, 虚拟场景, 线性参照

Abstract:

The high-speed railway and its surroundings is a complex system of "people, machine and environment". Building the virtual high-speed railway scene can present the railway lines and the terrains around them intuitively, which makes the technicians feel on the spot and allows them to acquire railway attributes and geographic information in a more efficient way so as to support the management decisions and scientific experiments. Linear referencing system is a one-dimensional system. It consists of a set of line features, on which events can be quickly located based on a reference to the line itself rather than through absolute x, y coordinates. So, according to the linear distribution characteristic of the high-speed railway spatial data and the fixed structure properties of feature object, this paper proposes a virtual scene modeling method for high-speed railway based on the linear referencing system. This modeling method abstracts and simplifies the complicated high-speed railway models and transforms them into reusable basic-element models. At the meantime, the corresponding attribute tables are also created. While doing the modeling work, the modeling objects are stored as the event tables in the database and then using linear referencing tools to do spatial locating. Eventually, the virtual high-speed railway scene can be constructed according to the located spatial positions and attitudes. In this paper, we firstly explored the characteristics of high-speed rail line and linear referencing system. Then we discussed some key technologies such as modeling flowchart, model attribute and event table design method, and geometric constraint in detail. Finally, we selected a case study region for carrying out a test. The results show that, this modeling method transforms the objects into event tables to do spatial locating, which reduces the complexity of calculations, and associates the attribute data with certain scene objects. Thus, this modeling method can surely be used in the management decisions as well as scientific experiments.

Key words: high-speed railway, three-dimensional modeling, linear referencing system, virtual scene