In contrast to temporal aggregation, non-temporal aggregation takes place over a geographical area. This area includes one or more stations that have been combined into a station group. The aim here is to obtain values over the geographical area. The result is, for example, a single annual multi-maximum of all stations from all annual maxima of the stations in a station group. Here, the time grid information is retained – in contrast to temporal aggregation, where you calculate an annual maximum from a monthly maximum, for example.