I have a polygon layer and want to check if there are some polygons overlapping within the same layer. How can I do this?
In ArcGIS, I could run the Intersect tool only by adding the layer I want to check. This doesn't work in QGIS because it requires an overlaying layer.
I tried to add the Topology check "overlap", but this only finds overlapping errors of newly drawn polygons, not existing ones.
I also tried the "Select by Attribute" with
- It only finds completely overlapping (identical) polygons (I also need to find the polygons that overlap only slightly)
- It does not create a layer (which would be handy)