Urban regional catchment areas

Description

Since the 1990s, the BBSR has regularly identified metropolitan regional catchment areas for the analysis of urban-environmental relations and developments in major cities. Over time, the criteria for the selection of major cities have changed. Currently, within the group of major cities (municipalities with at least 100,000 inhabitants) only those who — have a single commuter surplus (the number of commuters to the centre is higher than the number of commuters from the centre to other municipalities); — it is an upper center, — if the main commuter current does not come from the neighboring city. The supplementary area to the centre includes municipalities and community associations adjacent to the centre, which are particularly closely intertwined with the centre, but are themselves an important commuter destination. These municipalities and community associations have a high daily population density (residents + commuters — commuters per km²). In addition, they have a single commuter surplus and with a share of more than 50 % of the commuters to the centre. The commuter interconnection area is divided into two zones by 50 % and more of commuters and 25 % to less than 50 % in the centre and supplementary area (in brackets coding): — Center of a metropolitan area (1): Population >= 100,000 inhabitants (major city by city and municipality type), upper centre, surplus for commuters (single commuters/exiters >= 1), daily population > 100,000 inhabitants, main commuter current does not come from neighbouring centre — Supplementary area (2): Daily population density > 500 inhabitants/km², commuter surplus and 50 % of commuters commute to a core city — Narrower commuter interweaving space (3): at least 50 % of commuters commute to a centre/supplementary area — Further commuter interconnecting space (4): 25 % to 50 % of commuters commute to a centre/supplementary area Another criterion for belonging to a metropolitan catchment area is the area-specific link between the municipalities. In the formation of the categories according to the above criteria, exclaves — communities outside the contiguous zones arise. They are recoded by means of GIS into municipalities outside of metropolitan areas. Conversely, a few communities within the zones are recoded — especially between narrower and further commuter interconnection space to create coherent rings. The metropolitan regional catchment areas are redistributed at an interval of about 5 years, in the meantime adjustments to the state of the area take place.

Resources

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Tags

  • addresses
  • raumbeobachtung
  • statistical-units
  • großstadtregionen

Topics

  • SOCI

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