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I'm using ArcMap 10.2, and I need to map areas covered by London postcodes (E1 0xx, E1 1xx, E1 2xx, and so on). What I have is the coordinates for every single postcode (310,000 in total) in an Excel sheet, so I can create point feature classes, which I then want to group as explained above.

How can I create a polygon shapefile that will include a group of coordinates within E1 0xx postcode?

For example. I want that polygon shapefile to cover the are of those postcodes specifically. In the end I need to end up with multiple polygon shapefiles that will represent different Postcodes districts (E1 0xx, E1 1xx...). Tried the Coverage tool, but it's not seem to be doing what I expected it to. Just installed XTools Pro, maybe that could help me.

  • Would you be able to edit your Question to describe what you mean by coverage, please? I suspect that you are trying to get a tool working that will create output that is not what you are expecting. The term coverage can mean an old Esri vector format, or a raster format (as in Web Coverage Service), and there may be other meanings too. – PolyGeo Apr 15 '14 at 10:53
  • @PolyGeo - Just rephrased my question. I am afraid the Coverage Tool is not what I need. Was misguided by the standard meaning of coverage I think. – Madacify Apr 15 '14 at 11:05
  • This layer does not already exist as a polygon layer (e.g. shapefile)? – artwork21 Apr 15 '14 at 12:50
  • What do you mean? I only have the set of point as a point shp with all the coordinates. Where would it already exist as a polygon shp? – Madacify Apr 15 '14 at 13:04
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If I understand your question correctly what may work for you, if you have an Advanced level license, is to use the Create Thiessen Polygons tool which:

Creates Thiessen polygons from point features.

Each Thiessen polygon contains only a single point input feature. Any location within a Thiessen polygon is closer to its associated point than to any other point input feature.

Once you have the polygons run an ArcPy update cursor through them to give each a postcode "stem" value that you can Dissolve on.

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