Can you identify 10 world cities from their density maps alone? Test your urban knowledge with the new Guardian Cities Quiz using LSE Cities data visualisations. Developed as part of the Urban Age research programme density diagrams show the number of people living in each square kilometre of a 100km by 100km urban region.
Residential density measures how closely people live together. More compact cities have higher densities, while cities that sprawl and have wide open spaces between buildings have lower densities. The pattern of streets, squares and urban blocks – as well as how many people live in residential units – determines the density of a city alongside the height of individual buildings.