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一种基于道路网络层次拓扑结构的分层路径规划算法

DOI: 10.11834/jig.20070734

Keywords: 基于位置的服务,路径规划,最短路径算法,层次拓扑结构,分层算法

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Abstract:

鉴于平面最短路径算法应用于大规模网络规划中的效率不高,而分层算法引入“分而治之”策略,则能有效解决此难题。为了利用分层算法进行路径规划,首先研究了分层算法的数据基础――道路网络层次拓扑结构,其涉及基于道路等级的路网分层抽象、道路数据分区组织、以区域为单位的路网层次拓扑关系模型;接着提出了一种适用于LBS(基于位置的服务)的分层路径规划算法。该算法先通过距离值判断是否切换到上一层;然后利用启发式A^*算法搜索入口和出口;最后使用双向策略搜索层内两点之间的最短路径。利用现实道路网络进行的实验分析结果表明。该算法能从本质上提高大规模网络中路径规划的效率。

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