Unraveling the origin of exponential law in intra-urban human mobility.

Unraveling the origin of exponential law in intra-urban human mobility.
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DOI:
10.1038/srep02983
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发表时间:
2013-10-18
期刊:
影响因子:
4.6
通讯作者:
Xu, Ke
Xu, Ke
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Liang, Xiao;Zhao, Jichang;Dong, Li;Xu, Ke

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绝大多数旅行都发生在城市内。最近,新的数据已经成为可用的,这使得城市的流动性模式的发现,从有关长途旅行的既定结果不同。具体来说,最新的证据越来越多地指向指数行程长度分布,相反的尺度定律观察到更大的规模。为了探索指数规律的起源,本文提出了一个新的模型,它可以更好地预测城市地区的个人流量。基于该模型,我们解释了指数规律的城市内部流动的平均人口密度在城市地区的指数下降的结果。事实上,经验和分析结果表明,行程长度和人口密度共享相同的指数衰减率。
The vast majority of travel takes place within cities. Recently, new data has become available which allows for the discovery of urban mobility patterns which differ from established results about long distance travel. Specifically, the latest evidence increasingly points to exponential trip length distributions, contrary to the scaling laws observed on larger scales. In this paper, in order to explore the origin of the exponential law, we propose a new model which can predict individual flows in urban areas better. Based on the model, we explain the exponential law of intra-urban mobility as a result of the exponential decrease in average population density in urban areas. Indeed, both empirical and analytical results indicate that the trip length and the population density share the same exponential decaying rate.
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