MySQL Manual
11 Spatial Extensions in MySQL
- 11.2 The OpenGIS Geometry Model
- 11.2.1 The Geometry Class Hierarchy
- 11.2.2 Class
Geometry - 11.2.4 Class
Point - 11.2.7 Class
Curve - 11.2.9 Class
LineString - 11.2.12 Class
Surface - 11.2.14 Class
Polygon - 11.2.17 Class
GeometryCollection - 11.2.18 Class
MultiPoint - 11.2.21 Class
MultiCurve - 11.2.23 Class
MultiLineString - 11.2.25 Class
MultiSurface - 11.2.27 Class
MultiPolygon
11.2.27 Class MultiPolygon
A MultiPolygon is a MultiSurface object composed of
Polygon elements.
11.2.28 MultiPolygon Examples
-
On a region map, a
MultiPolygoncould represent a system of lakes.
11.2.29 MultiPolygon Assertions
-
The interiors of two
Polygonvalues that are elements of aMultiPolygonmay not intersect. -
The boundaries of any two
Polygonvalues that are elements of aMultiPolygonmay not cross and may touch at only a finite number of points. (Crossing is also forbidden by the preceding assertion.) -
A
MultiPolygonmay not have cut lines, spikes or punctures. AMultiPolygonis a regular, closed point set. -
The interior of a
MultiPolygoncomposed of more than onePolygonis not connected. The number of connected components of the interior of aMultiPolygonis equal to the number ofPolygonvalues in theMultiPolygon.
11.2.30 MultiPolygon Properties
-
A
MultiPolygonis defined as a two-dimensional geometry. -
The boundary of a
MultiPolygonis a set of closed curves (LineStringvalues) corresponding to the boundaries of itsPolygonelements. -
Each
Curvein the boundary of theMultiPolygonis in the boundary of exactly one elementPolygon. -
Every
Curvein the boundary of an elementPolygonis in the boundary of theMultiPolygon.
