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Given this polygon:

enter image description here

I'm trying to select the inner one, but can't find a simple way using either selection by location or selection by expression

Any idea?

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    yep same layer, and nope I don't have postgis setup
    – asiera
    Sep 19, 2021 at 11:12

1 Answer 1

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Use Select by expression with this expression and change the size of the buffer (end of line 2 - here: 0.0001) depending on the size of your polygons/the CRS you use (in most cases, it should work without adaptions).

Explanation: the expression evaluates if the outer boundary of a buffer around a polygon feature is within the nearest neighboring polygon.

within (
    boundary (buffer( $geometry,0.0001)),
    array_first (overlay_nearest (@layer, $geometry))
)

enter image description here

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    Brilliant, once again! you're a champ. The buffer distance shouldn't too much of an issue in my case, as my polygon sizes shouldn't be varying too widely. A minor issue, that doesn't matter in my case but it could for some as this solution would also select polygons that are contain within another polygon. Anyway Thanks again.
    – asiera
    Sep 19, 2021 at 11:33

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