Regional maps 1 : 100 000 are derived from the main topographic maps 1 : 50 000 and 1 : 100,000 is derived. The geodetic foundations and administrative boundaries are reworked to scale and settlements and cities are presented in terms of area. The sheets of regional maps 1 : 100,000 are based on the districts in the state of Brandenburg. A map depicts Berlin with the adjoining areas. The cards are sold individually or as a set of 14 cards.The cards are usually updated biennially.