ST_CENTROID

Returns the centroid of a Polygon or MultiPolygon. The result is a Point geometry representing the mathematical center of mass.

Syntax

ST_Centroid(mpoly)
Centroid(mpoly)

Description

Returns a point reflecting the mathematical centroid (geometric center) for the MultiPolygon mpoly. The resulting point will not necessarily be on the MultiPolygon.

ST_Centroid() and Centroid() are synonyms.

Examples

SET @poly = ST_GeomFromText('POLYGON((0 0,20 0,20 20,0 20,0 0))');
SELECT ST_AsText(ST_Centroid(@poly)) AS center;
+--------------+
| center       |
+--------------+
| POINT(10 10) |
+--------------+

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