Category Archives: allometry

A City is Not a Tree: 50th Anniversary Edition

A really nice idea. Michael Mehaffy has put together a superb collection of comments on Chris Alexander’s famous 1965 paper “A City is Not a Tree”. The comments which are presented in slightly longer papers and shorter contributions are from those … Continue reading

Posted in allometry, Complexity, Emergence, Hierarchy, power laws, Scaling | Leave a comment

Variability in Regularity: Transit in Big Cities

Chen Zhong is leading CASA’s work in measuring variability and regularity in big data from automated capture of travel demand on subway systems in three world cities. This paper in PLOS One is our first on a comparison of tap … Continue reading

Posted in allometry, Big Data, Connectivity, Flows, Graphs, Interactions, Transport Models | Leave a comment

On the Problem of City Boundaries

Paolo Masucci led this study based on defining city boundaries – one of the key research issues in CASA on our Mechanicity project – introducing a really simple idea that cities grow to a condensation threshold after which the city is … Continue reading

Posted in allometry, Connectivity, Emergence, Fractals, power laws, Scaling | Leave a comment