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MultiPolygon
Functions
Area(mpoly)
Returns as a double-precision number the area of the MultiPolygon
value mpoly
, as measured in its spatial reference system.
mysql> SELECT Area(GeomFromText('MultiPolygon(((0 0,0 3,3 3,3 0,0 0),(1 1,1 2,2 2,2 1,1 1)))')); +-----------------------------------------------------------------------------------+ | Area(GeomFromText('MultiPolygon(((0 0,0 3,3 3,3 0,0 0),(1 1,1 2,2 2,2 1,1 1)))')) | +-----------------------------------------------------------------------------------+ | 8 | +-----------------------------------------------------------------------------------+ |
The OpenGIS specification also defines the following functions, which MySQL does not implement:
Centroid(mpoly)
MultiPolygon
value
mpoly
as a Point
. The result is not guaranteed to be on
the MultiPolygon
.
PointOnSurface(mpoly)
Point
value that is guaranteed to be on the
MultiPolygon
value mpoly
.