I need to add polygon centroids to vector grid but I can't... I have output grid like polygon, but I can't choose layer to make centroids
I need it for R studio and pollution model of city.
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Your grid is not made of polygons. I suspect its lines. Check the "geometry type" section of the metadata section of the layer properties. I'll wager its not "Polygon"...
If you made it with the "Vector Grid" tool then you should have ticked "Output grid as polygons" instead of "Output grid as lines".