罗马微观经济活动的时空分析揭示了混合用途城市演变的模式
Spatio-temporal analysis of micro economic activities in Rome reveals patterns of mixed-use urban evolution
摘要：
理解城市增长就是理解社会如何演变以满足个人在共享公共空间和适应领土方面的需求。在这里，我们提出了一个定量分析的历史发展的一个大的城市地区，通过调查的空间分布和商业活动在整个罗马城的年龄。我们发现，各类活动的年龄呈现出一个非常有趣的双指数趋势，过渡可能与70年代石油危机所决定的长期经济影响有关。通过对熵的各种测量研究商业类别的多样化，除其他有趣的特征外，还显示出活动密度的饱和行为。此外，多年来，不同的商业类别组合表现出在空间吸引人的趋势。我们的研究结果表明，商业活动的时空分布可以提供重要的洞察城市化过程中的工作，揭示具体的和不平凡的社会经济动态，作为危机时期和扩张趋势的存在，并有助于表征城市地区的成熟度。
英文摘要：
Understanding urban growth is one with understanding how society evolves to satisfy the needs of its individuals in sharing a common space and adapting to the territory. We propose here a quantitative analysis of the historical development of a large urban area by investigating the spatial distribution and the age of commercial activities in the whole city of Rome. We find that the age of activities of various categories presents a very interesting double exponential trend, with a transition possibly related to the long-term economical effects determined by the oil crisis of the Seventies. The diversification of commercial categories, studied through various measures of entropy, shows, among other interesting features, a saturating behaviour with the density of activities. Moreover, different couples of commercial categories exhibit over the years a tendency to attract in space. Our results demonstrate that the spatio-temporal distribution of commercial activities can provide important insights on the urbanisation processes at work, revealing specific and not trivial socio-economical dynamics, as the presence of crisis periods and expansion trends, and contributing to the characterisation of the maturity of urban areas.
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