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GIS-T路网数据模型是实现ITS应用的前提和基础。本文以道路要素作为表达、存储和组织路网数据的基本单位,考虑不同尺度下的应用需求,提出了基于道路要素的多尺度路网数据模型,同时建立了道路拓扑关系与车道拓扑关系。本模型在不同尺度下分为3个层次,不同层次的要素之间建立了实体对应关系。该模型在交通标志标线布设方案自动生成系统上的实验表明,其建模方法是可行、有效的。
GIS-T road network data model is the premise and foundation of ITS application. This paper takes the road elements as the basic units to express, store and organize the road network data. Considering the application requirements under different scales, a multi-scale road network data model based on road elements is proposed. Meanwhile, the relationship between the road topology and lane topologies is established. The model is divided into three levels at different scales, and the entity correspondences between different levels of elements are established. Experiments on the automatic generation system for traffic markings marking scheme show that the modeling method is feasible and effective.