ST_Centroid

Determine the geometric center of a geometry.

The geometric center of the geometry is the "average" of the points in the geometry. The result is not guaranteed to be on the geometry. If the geometry is empty, an empty point is returned.

Syntax

ST_Centroid(geo);

geo: The input geometry.
Type: ST_GEOMETRY(ANY)

Returns

A value of type ST_GEOMETRY(126) that contains a point geometry.

Examples

inza..ST_AsText(inza..ST_Centroid(inza..ST_WKTToSQL('LINE STRING (0 0, 10 0)')));

ST_ASTEXT
---------
POINT (5 0)
(1 row)

SELECT inza..ST_AsText(inza..ST_Centroid(inza..ST_WKTToSQL('POLYGON ((0 0, 10 0, 10 10, 0 10, 0 0))')));

ST_ASTEXT
-----------
POINT (5 5)
(1 row)


SELECT
inza..ST_AsText(inza..ST_Centroid(inza..ST_WKTToSQL('POLYGON ((10 10, 10 20, 20 20, 20 15, 10 10))')));
ST_ASTEXT
-----------
POINT (15 15)
(1 row)