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I'm quite new to Qgis and have a problem which is easy to solve, I think. I've done research for hours but did not succeed.

I have a data set which contains thousands of polygons in one layer. What I want to do: Dissolve all polygons which overlap, intersect or touch with others. This means that there should not be any borders between overlapping, intersecting or touching polygons anymore. I don't have any helping attributes to achieve this.

Finally, I would like to export a new .shp file of the new data set.

I tried "dissolve all" but this makes just one big polygon, which I don't want. As a first step i thought to solve it with "Intersect...". But this works just with two layers. With the advanced digitizing tools I would have to select all of them manually to "merge selected features".

I'm using Qgis version 2.14.15

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  • What about dissolving all and then split it in multi part? You have a tool for that in the advanced editing tools. – Noe Jul 20 '17 at 12:56
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Try dissolving all and then split it in multi part. You have a tool for that in the advanced editing tools.

Edit: Split in single part!!!

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    Thank you very much Noe. The solution was, as you suggested, to dissolve all but then split in single parts lead to the solution I was looking for. – polymerger Jul 20 '17 at 17:06
  • Sorry, I was referring to single part instead of multi part. It was a lapse! – Noe Jul 21 '17 at 9:21

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