通过建立的道路模型，根据道路的几何约束关系以及行业标准，重建出整个道路的立体视图，从而测出障碍物的距离。
On the road modeling, according to road geometry restriction and industry standards, 3d road model is reconstructed and the distance of obstacle is calculated.
目前，基于路段中心线的二维道路网络模型已经普遍存在，但其在几何特征及拓扑关系表达等方面都难以满足复杂交通系统的需求。
The information of centerlines can not cover the changes of lanes, and the two-dimensional model is also inadequate in the expression of three-dimensional transportation networks.
在分析了线性参照系统概念模型的基础上，对其中两个关键问题进行了研究，即基于道路几何特征的线性参照基准模型和基于道路曲线要素的动态分段模型。
In this paper, a linear referencing system based on road line-shape is presented in order to reduce spatial data redundancy and protect road event from going out of road range.
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