MySQL 8.0 Reference Manual Including MySQL NDB Cluster 8.0

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.