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In QGIS 3.16 I have one layer with a lot of single polygons and some of them intersect.

I want to aggregate these intersecting polygons to one single polygon. As a result i need the size of the connected polygons. None of the intersecting polygons have a shared value in the attribute table, which the other polygons which are not intersecting (and therefor don t need to be grouped/aggregated/merged) don't also have.

Is there a similar tool to ArcGIS Aggregate?

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    You could dissolve and then run multi to single part. This will remove the attributes, though.
    – Erik
    Jun 18, 2021 at 10:43
  • @Erik, I think you can put it as a valid answer
    – Taras
    Jun 18, 2021 at 11:45
  • Not unless OP states, whether they need to keep the attributes or not @Taras
    – Erik
    Jun 18, 2021 at 12:03
  • Yes agree, but returning attributes is not a big deal!
    – Taras
    Jun 18, 2021 at 12:07
  • Hi, yep it would be good to keep the attributes-if its easy to return them then I would go with the proposed way. How is it not a big deal to return the attributes? Thanks-i will update the question later including this question...
    – Flynx
    Jun 18, 2021 at 13:13

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@Babel send this link: Merge adjacent polygons & concatenate attribute values (QGIS)

It worked for me like that, thank you very much!

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  • If you do not mind, I am voting to close your question a duplicate to this gis.stackexchange.com/questions/396361/…, since you have found an answer in a different thread.
    – Taras
    Jun 21, 2021 at 10:28
  • I think it will be easier you you do it :)
    – Taras
    Jun 22, 2021 at 5:47
  • Ah ok, sorry I don't know how to do that, I am quite new to this forum. Could u give me a hint where I do this?
    – Flynx
    Jun 22, 2021 at 7:35
  • No worries, I was also new to this forum. Please check underneath your question there is a button Close
    – Taras
    Jun 22, 2021 at 7:38

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