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arXiv 1406.0691physics.soc-phphysics.data-an
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城市设施的尺度特性

Scaling Properties of Urban Facilities

Liang Wu

摘要:

采用两种测量方法定量研究了城市设施空间分布的标度特性,即计数法的K函数和扩展箱法的方差-均值关系。K函数和方差-均值关系都是幂函数。这意味着城市设施的空间分布具有尺度不变性。进一步的数据分析(包括中国37个主要城市的8种设施)表明,幂函数的指数在设施和城市之间没有系统性的变化,这表明标度规则具有普遍性的可能性。提出了一个双随机过程(DSP)模型,使两个经验结果都可以嵌入。DSP的模拟产生更好的协议与城市数据比相关渗流模型。

英文摘要:

Two measurements are employed to quantitatively investigate the scaling properties of the spatial distribution of urban facilities, the K function by number counting and the variance-mean relationship with the method of expanding bins. The K function and the variance-mean relationship are both power functions. It means that the spatial distribution of urban facilities are scaling invariant. Further analysis of more data (which includes 8 types of facilities in 37 major Chinese cities) shows that the exponents of the power function do not have systematic variations across facilities and cities, which suggests the possibility that the scaling rule is universal. A double stochastic process (DSP) model is proposed such that the two empirical results can both be embedded. Simulation of DSP yields better agreement with the urban data than of the correlated percolation model.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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