The spatial reference system was provided by the digital block map 1:5,000 (ISU5), as of December 31, 2015. This working map contains the individual statistical blocks. Blocks with more than one use are divided into block segments. The numbering and street limit lines of blocks correspond to those used by the Statistical Office of Berlin-Brandenburg.
The population density, the quotient of the number of inhabitants by the area size, was determined for each reference area. The size of each statistical block, needed for the calculation of population density, was calculated using the ISU5 1:5,000 equal-area map. Figures for the number of inhabitants were assigned to statistical blocks and block segments according to the ISU spatial reference system.