Check Geometry Validity
It is
accessed through:
Tools > Check Geometry Validity...
The Check
Geometry Validityis used
to check if the layer has invalid geometries and to explain the reason
(such as 'self-intersection', 'ring-self-intersection', '
nested-shells').
- Select
the layer to be analyzed ( vector layers only).
- Click the Verify button and wait for a list of all invalid geometries and the reason.
- Double-click on each invalid geometry in the list to locate it on the map (small green square).