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Using QGIS, I need to combine a point dataset with an associated multi-polygon dataset, and clip away any of the polygons which do not have an associated point, please see image attached. The point layer is tree locations and the multi-polygon layer is tree canopy areas, so I need to combine the two to get tree and canopy locations to align, and clip away any of the polygons which do not have an associated point. The two different geometries of the datasets have been tripping me up.

I've tried "Join attributes by location" but I am now receiving a message saying "feature (4160) has invalid geometry...". Can someone please offer a suggestion for overcoming the invalid geometry issue?

enter image description here

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  • Which software are you using?
    – Nikos
    Commented Apr 15, 2023 at 23:55
  • Sorry, I'm using QGIS
    – Techtix
    Commented Apr 15, 2023 at 23:55
  • You can't merge them but you can select by location/join attributes by location then export polys that have points to a new layer.
    – user2856
    Commented Apr 16, 2023 at 1:40

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