[Qgis-user] aggregate polygon overlay

[Simon Dietmann]

Dear list,

I am trying to solve the following problem:

I have one polygon layer with many polygons  that are in many cases overlapping and with different attribute valus, e.g. a, b, c:
[cid:image001.png at 01DCA01D.DFC66850]

My goal is to generate a polygon layer with polygons for every overlap constellation containing a concat string of those attributes, in this example seven polygons with the attributes a, b, c, ab, bc, ac, abc.

I started with a union of my original layer, the result is a layer with 12 polygons where overlapping areas of the original polygons result in overlapping intersections containing one of the original attributes each, for example in the middle, there are 3 polygons, one with a, one with b and one with c.

How is it possible to summarize those overlapping polygons into one polygon each with all the attributes, given that there is a large number of polygons and different attributes?

Thank you for any hints,

regards

Simon

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