I have a single layer of polygons. Some of the polygons overlap.
I wish to make a new layer of just the parts of the polygons that overlap.
What is the best way to do this in QGIS seeing it's all in one layer?
I tried the clip and intersect in the geo-processing tools, but they expect two layers.
Best Answer
There's is a rough and dirty way to do it. I say rough and dirty because I've been getting strange intersect results which I'll open a bug for.
Depending on the complexity or count of the features, running these can take a couple mins.
Some optional additional steps could be if you have an ID type of field with common or unique attributes do a dissolve then a Singleparts to Multipart.