Figure 2
From: From mobile phone data to the spatial structure of cities
Population sizes, areas and densities of 31 Spanish cities (urban areas) with more than 200,000 inhabitants in 2011.
(a) Population size vs. area. The set of cities under study displays a large variety of sizes. We also note that there is no general statistical relation between the population size of Spanish urban areas and their spatial extension. (b) Rank-size distribution of their residential density and phone activity density (rescaled by a constant factor given by the inverse of the fraction of phone users in the denser urban area, ρBarcelona,residential/ρBarcelona,phoneusers). The distribution shows that the fraction of phone users is almost constant in all cities. This figure was created with R and LibreOffice Draw.
