MySQL 5.6 Reference Manual Including MySQL NDB Cluster 7.3-7.4 Reference Guide
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.