13.4.2.7 Polygon Class

A Polygon is a planar Surface representing a multisided geometry. It is defined by a single exterior boundary and zero or more interior boundaries, where each interior boundary defines a hole in the Polygon.

Polygon Examples

• On a region map, Polygon objects could represent forests, districts, and so on.

Polygon Assertions

• The boundary of a Polygon consists of a set of LinearRing objects (that is, LineString objects that are both simple and closed) that make up its exterior and interior boundaries.

• A Polygon has no rings that cross. The rings in the boundary of a Polygon may intersect at a Point, but only as a tangent.

• A Polygon has no lines, spikes, or punctures.

• A Polygon has an interior that is a connected point set.

• A Polygon may have holes. The exterior of a Polygon with holes is not connected. Each hole defines a connected component of the exterior.

The preceding assertions make a Polygon a simple geometry.