ATKIS Basis-DLM is the data basis for the Outdooractive map in Germany.
ATKIS = official topographic cartographic information system
DLM = digital landscape model
The basic DLM describes the topographic objects of the landscape and the relief of the earth's surface in vector format. In this data set, the geometries and attributes are recorded independent of scale and image. This product is maintained and updated by the individual survey administrations of the federal states - the BKG defines a uniform structure for data delivery.