I have two layers which are perfectly nested. There are dozens of SA1 polygons (thin grey outline - see image attached) within the LGA polygon (thick green outline - see image attached). I would like to select all SA1s within the larger LGA polygon.
When I try and do this with the "select by location" tool by choosing "are within" it excludes SA1s where the centroid is clearly within the LGA boundary but may slightly intersect. When I choose "are within" and "intersect" it then spills over the LGA boundary.
The second image shows the ideal end state of what I am trying to achieve.
This is a very simple task in MapInfo using the boundary selection tool but is much harder in QGIS.