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航空货运网络是影响城市层级结构的重要因素之一,对其进行量化分析具有十分重要的理论和现实意义。根据2002—2008年中国航空货运数据库构建的中国航空货运网络,运用复杂网络分析的测度方法,以城市航空货运量比例为依据,将中国航空货运网络分成初始层级网络、中级层级网络和核心层级网络3个层次。基于航空货运网络视角,将中国通航城市分成核心、中级和边缘城市3类层级。通过对平均路径长度、聚类系数、度分布、密度等网络特征的分析,证明了3个层级城市所在的网络都具有小世界和无标度特性,研究表明中国城市层级结构具有金字塔特性,分布严重不均匀,值得关注。
Air freight network is one of the most important factors which affect the city hierarchy. It is of great theoretical and practical significance to conduct quantitative analysis. According to the Chinese air cargo network constructed by China Air Cargo Database from 2002 to 2008, using the method of complex network analysis, based on the proportion of urban air cargo, China’s air cargo network is divided into initial level network, intermediate level network and core level network 3 levels. Based on the perspective of air cargo network, China’s navigable city is divided into three levels of core, intermediate and peripheral cities. Through the analysis of network characteristics such as average path length, clustering coefficient, degree distribution and density, it is proved that the networks in all three cities have the characteristics of small-world and scale-free. Studies have shown that Chinese urban hierarchy has the characteristics of pyramid, distribution Seriously uneven, it is worth attention.