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Catchment - methodology

This page brings together the definitions and assumptions behind catchment calculations in Placepoint.

Definitions​

  • Catchment (Norwegian: nedslagsfelt) is the combined area treated as reachable from a starting point, bounded by an isochrone.
  • Isochrone is the polygon that encloses every point you can reach within a given travel time using a given travel mode. The shape follows the road network and timetable data, not a circle.
  • Radius is a circle with a fixed length from the starting point, independent of the road network. Use it when you want to compare on geographical distance instead of travel time.

The travel modes, the speed assumptions and what makes an isochrone smaller than expected are described on Travel distance, because that is the tool that draws the isochrone.

Estimated grocery turnover​

The catchment layer can show estimated grocery turnover for the area the isochrone covers.

  • The estimate covers total grocery retail within the bounded area.
  • The underlying data is usually updated once a year.
  • The estimate does not distinguish between shops at the edge of the isochrone and shops further inside it.

See also​

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Note! These pages are generated automatically. The content may be incomplete or wrong, screenshots and videos especially. See About these help pages. We would really like your input: reach us through "Did you find what you were looking for?" at the bottom of the page, the chat at bottom right, or support@placepoint.no - we answer as fast as we can!