Ring closure
A rule that polygon rings must end with the same coordinate they start with.
Category: Topology · Also known as: closed ring, close rings
Definition (expanded)
Most polygon representations require rings to be closed. That means the last coordinate must exactly match the first coordinate. Some tools auto-close rings on import, but validators often report the issue so you can confirm intent.
Related terms
Ring (Linear Ring)A closed sequence of coordinates used as a polygon boundary (exterior) or hole (interior).PolygonA closed area geometry defined by an exterior ring and optional interior rings (holes).Valid geometryA geometry that follows topological rules (closed rings, no self-intersections, properly nested holes, etc.).