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Polygon
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
Polygon objects could represent forests, districts, etc.
Polygon Assertions
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.
Polygon has no rings which cross. The rings in the boundary of a
Polygon may intersect at a Point, but only as a tangent.
Polygon has no lines, spikes, or punctures.
Polygon has an interior which is a connected point set.
Polygon may have holes.
The exterior of a Polygon with holes is not connected.
Each hole defines a connected component of the exterior.
The above assertions make a Polygon a simple geometry.