Mean basal topicality

Basal topicality refers to the topicality of the ATKIS Basis-DLM (as base data for most indicators) determined by the regular updating of map sheets, expressed as a single year. The mean basal topicality is calculated as the spatially weighted arithmetic mean of the topicalities of all maps for one spatial unit (rounded to an integer value). As geo data is updated at different periods depending on the spatial level, the topicality of an indicator for one reference year can vary depending on whether the base data is issued by a municipality, district or indeed the state.

Within ATKIS Basis-DLM there is a distinction between basal and peak topicality. In addition to regular data updates, changes to particularly important topographical objects (primarily in the area of transport) are introduced into geo base data as a form of peak updating at 3, 6 or 12 monthly intervals.

Note: the reference year when selecting a time frame in the map viewer is the year in which data was supplied, and thus is generally more recent that the actual topicality of the indicator values describing individual spatial units.