(mysql.info.gz) GIS class polygon
Info Catalog
(mysql.info.gz) GIS class surface
(mysql.info.gz) OpenGIS geometry model
(mysql.info.gz) GIS class geometrycollection
18.2.7 Class `Polygon'
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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
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* On a region map, `Polygon' objects could represent forests,
districts, an so on.
`Polygon' Assertions
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* 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.
Info Catalog
(mysql.info.gz) GIS class surface
(mysql.info.gz) OpenGIS geometry model
(mysql.info.gz) GIS class geometrycollection
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