Overlay

Overlaps, unions, and differences of polygons.

This group finds where two polygons overlap, their combined outline, and what one covers that the other does not, with geodesic areas. GIS analysts and drone operators use it to compare parcels, flight areas, and geofences. Start with the overlap of two polygons. A common pitfall is feeding in an invalid polygon, such as a bow-tie with crossed edges; check and repair it first.

I want to find where two areas overlap, or combine or subtract them

Overlap, union, or difference of two polygons
Where two areas overlap, their combined outline, what one has that the other lacks, or both, as valid polygons with geodesic areas, like the overlap of two geofences.