The purpose of this thematic map is to assess the evolution of spatial differentiation of Prague's population age structure in 1930-2011. This is achieved through cartograms, representing a typology of Prague cadastral territories (or more precisely urbanistic districts in 2011) based on the share of four main age groups (0-14, 15-44, 45-64, 65 and more), as compared to their share in Prague as a whole.
The typology is based on two levels. The first (basic) one divides the cadastral territories into 14 types based on different combinations of below-average and above-average shares (shares lower or higher than those in Prague as a whole) of four main age groups.
For example, cadastral territories / UDs marked "higher share of the elderly" have a higher share of people aged 65 and more than it is the case for Prague as a whole, and a lower share of all other age groups. The second (main) level of typology combines two basic types (first level types) into one superordinate type.
Seven types created in this way describe cadastral territories / UDs based on the age of the population. Proportional symbols then compare the age structure in individual years (i. e. not with regard to the age structure of Prague).