MySQL 5.7 Reference Manual Including MySQL NDB Cluster 7.5 and NDB Cluster 7.6

A `MultiPolygon`

is a
`MultiSurface`

object composed of
`Polygon`

elements.

`MultiPolygon`

Examples

On a region map, a

`MultiPolygon`

could represent a system of lakes.

`MultiPolygon`

Assertions

A

`MultiPolygon`

has no two`Polygon`

elements with interiors that intersect.A

`MultiPolygon`

has no two`Polygon`

elements that cross (crossing is also forbidden by the previous assertion), or that touch at an infinite number of points.A

`MultiPolygon`

may not have cut lines, spikes, or punctures. A`MultiPolygon`

is a regular, closed point set.A

`MultiPolygon`

that has more than one`Polygon`

has an interior that is not connected. The number of connected components of the interior of a`MultiPolygon`

is equal to the number of`Polygon`

values in the`MultiPolygon`

.

`MultiPolygon`

Properties

A

`MultiPolygon`

is a two-dimensional geometry.A

`MultiPolygon`

boundary is a set of closed curves (`LineString`

values) corresponding to the boundaries of its`Polygon`

elements.Each

`Curve`

in the boundary of the`MultiPolygon`

is in the boundary of exactly one`Polygon`

element.Every

`Curve`

in the boundary of an`Polygon`

element is in the boundary of the`MultiPolygon`

.