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enter image description hereI created a Map with Geocoded Addresses from the UK. The Basis for the map is a UK districts shape-file, this constitutes my main layer. After Geocoding (via .cvs) 3 Addresses I have a new layer with the three Address-Points.

The goal is now to create a Buffer around the Address Point that spans or fills out the entire area of the postcode to which that Address belongs

In the picture I included an example with a normal Buffer (just a circle with radius = x) the goal would be to fill the whole postal area with the Buffer.

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    Hi welcome to GIS SE. Please include a tag of what software you're using. Also there's no image attached. – TeddyTedTed Oct 20 '20 at 15:14
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    there is no picture - wouldn't doing point in polygon and then coloring the polygons be easier than buffering? – Ian Turton Oct 20 '20 at 16:03
  • Are you talking about Postcode Districts? en.wikipedia.org/wiki/… – Mapperz Oct 20 '20 at 17:23
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You do not mention what software you are using but the workflow is the same for ArcGIS, ArcGIS Pro, or QGIS:

  1. Create Voronoi polygons around your three points at an extent greater than the postcode polygon. For QGIS see Voronoi Polygons in Processing tools under Vector Geometry. For ArcGIS see ArcToolbox - Analysis Tools - Create Thiessen Polygons (advanced license only).
  2. Clip the resulting Voronoi polygons with your postcode polygon. In QGIS try Vector Overlay - Clip, for ESRI try ArcToolbox - Analysis Tools - Extract - Clip.

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