Joining attributes by the biggest overlapping areas

Question

I have two layers and I want to join the attribute of them together in QGIS. Unfortunately, the overlapping layer (The Blue one) ist not very precicse, so there are parts that overlap on small areas.

If I join the attributes together (-> join type: intersects/one to many), I get multiple overlapping attributes. But i only want the attributes with the biggest overlaping area, which would be those:

If join the attributes together with the one to one method, I often get the attribute of the small overlapping parts, which i dont need/are wrong. I know I can get the mean attributes of all overlapping areas with the Join Attributes by Location (summary) function, which is partly a solution to my problem.
But what I really want is to only join the attribute with the biggest overlapping area. Any idea how to do this?

Christian Leidersdorff · Accepted Answer

In qgis there is a plugin called select by centroid. But building on that I developed my own model to join based on the layer centroids by converting the layer to centroids and then join that table... Works a treat

Correct answer by Christian Leidersdorff on December 2, 2020

ndawson · Answer

The "Join Attributes by Location" algorithm from the Processing Toolbox has a switch to do exactly this:

Joining attributes by the biggest overlapping areas

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