Validity
Checks that polygons are well formed, and repairs them.
This group checks a polygon for problems such as crossed or touching edges, duplicate corners, spikes, holes outside the outline, and wrong ring order, says where each one is, and returns a repaired polygon. GIS analysts and developers use it before measuring areas or running overlays. Start with check and repair. A common pitfall is a bow-tie outline with crossed edges, whose area means nothing until it is split into two triangles.
I want to check a polygon and repair it
- Check and repair a polygon
Finds what is wrong with a polygon (crossed or touching edges, duplicate corners, spikes, holes outside the outline, clockwise rings), says where, and returns a repaired version: a bow-tie becomes two triangles.