Island Polygon

An RVC vector object has a rigorously defined topology, which keeps track of things like lines that intersect at nodes, polygon elements on either side of a line element, line elements that form a polygon, island polygons within polygons, ...

Islands, or island polygons are common in spatial data, for example an island may represent features such as enclosed areas of water such as lakes, or parks within urban areas.

See also: Feature, Polygon, Interface, Geographic, Attributes