Ring (Linear Ring)
A closed sequence of coordinates used as a polygon boundary (exterior) or hole (interior).
Category: Geometry
Definition (expanded)
A ring is a list of coordinates where the first and last are equal. Polygons are built from one exterior ring plus optional interior rings. Many validators check ring closure, duplicate points, and ring orientation depending on the toolchain.
Common mistakes
- Leaving rings open.
- Repeating points excessively and creating spikes.
Related terms
PolygonA closed area geometry defined by an exterior ring and optional interior rings (holes).Hole (Interior Ring)An interior ring inside a polygon that subtracts area (a cut-out).VertexA single coordinate point in a ring or line; polygons are made of many vertices.Ring closureA rule that polygon rings must end with the same coordinate they start with.Winding order (ring orientation)The direction a ring is written, clockwise or counterclockwise, which some systems use to distinguish outer rings from holes.