摘要
为了剖析城市路网拓扑结构的复杂性,识别路网中的关键路段,根据模块结构理论,分析了城市路网的聚类特性,提出了一种适用于城市路网模块结构划分和Hub路段诊断的算法——GN-T算法.该算法通过逐条移除介值最大的路段实现模块结构的划分,从而诊断出路网中的Hub路段.为确定模块结构的最佳划分,提出了一个改进的模块度函数.以武昌区路网为例对该算法进行验证,结果显示:武昌区路网模块度的最大值为0.41,表明该路网具有明显的模块结构特性;利用该算法诊断出的Hub路段与实际情况相符,证明了该算法的有效性和实用性.
In order to detect the complexities of topology and discover the key road sections in urban road network,the clustering feature of urban road network was analyzed by modular structure theory, and a GN-T algorithm was proposed for dividing the modular structures and diagnosing hub sections in the urban road network. By iterative removal of links with the maximum intermediate values from road network,this algorithm split the whole network into modular structures and found out hub sections. In addition,an improved modularity function was also proposed for determining the optimal number of modular structures in the urban road network. As a case study,the urban road network of Wuchang city was used to test and verify the algorithm. The results show that the maximal value of modularity in the network is 0 . 41 ,indicating that the urban road network of Wuchang city possesses obvious modular structure characteristics. In addition,the hub sections derived from the algorithm is consistent with the reality. All these demonstrate the effectiveness and practicability of the GN-T algorithm.
出处
《西南交通大学学报》
EI
CSCD
北大核心
2014年第4期706-711,共6页
Journal of Southwest Jiaotong University
基金
国家自然科学基金资助项目(61174188)
