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MySQL 5.6 Reference Manual
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11.5.2.13 MultiPolygon Class

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.


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