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提出了一种支持高性能车辆导航的多尺度路网数据模型,该模型根据不同功能对导航数据内容与尺度的要求,将用于计算的路网拓扑数据与用于描述的路网几何数据分离,并分别在垂直方向进行分层抽象,在水平方向进行区域划分;几何数据以显式比例尺作为分层标准,通过多弧段来描述道路几何信息;拓扑数据以道路等级作为分层标准,通过节点-弧段结构来描述路网连通关系;参照动态分段思想设计了一种弧段编码体系,以描述模型上下层弧段之间、单弧段与多弧段之间的对应关系。结果表明:提出的模型能有效地支持导航应用中的多级地图显示与分层路径规划。
A multi-scale road network data model that supports high-performance vehicle navigation is proposed. This model separates the road network topology data used for calculation and the road network geometry data for description according to the requirements of different functions on the content and scale of navigation data , Respectively, in the vertical direction of the stratified abstraction, in the horizontal direction of the regional division; geometric data to the explicit scale as a stratification standard, multi-arcs to describe the road geometry information; topology data to the road level as a stratification criterion, by Node-arc structure to describe the connectivity of road network. An arc coding system is designed according to the dynamic segmentation idea to describe the correspondence between the upper and lower arcs of the model, between single arc and multiple arcs. The results show that the proposed model can effectively support multi-level map display and hierarchical path planning in navigation applications.