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I'm trying to understand (and solve) the following issue in QGIS (2.16.3): I have a shapefile with hexagons which I want to merge. Doing so works, but certain "borders" (not sure about the correct term, sorry) inside the polygon remain, and I cannot figure out how to remove them (see below).

input:

enter image description here

output:

enter image description here

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    If you want to remove all polygon 'borders', you could try running the Dissolve tool on your layer. – Joseph Oct 17 '16 at 13:41
  • thanks joseph - i've tried that but it leads to the same result. – Herbert Hubert Oct 17 '16 at 14:41
  • May be you have geometry issues – Gerardo Jimenez Oct 17 '16 at 14:51
  • Probably the vertices of adjacent polygons are not exactly the same and therefore the boundaries are not merged. You should snap the vertices with a reasonable tolerance as the first step. – user30184 Oct 17 '16 at 15:38
  • thanks for your comments, which gave me some ideas. the vertices are ok, the problem was with the projection. – Herbert Hubert Oct 17 '16 at 17:15
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ok, in the end there was some problem with the projection. i rerun the projection on the file and suddenly it worked.

thanks for your input and sorry for the bother, since the shapefile looked perfectly normal in qgis i never thought that the problem was there - or even that a faulty projection could prevent a proper merge.

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