PostgreSQL point(polygon) Function

The PostgreSQL point(polygon) function calculates the center point of the specified polygon and returns that. It is the average of the polygon’s multiple point positions.

point(polygon) Syntax

This is the syntax of the PostgreSQL point(polygon) function:

point(polygon) -> point

Parameters

polygon

Required. A polygon. For example: polygon '((0,0),(1,1),(2,0))'.

Return value

The PostgreSQL point(polygon) function returns the center point of the polygon specified by the parameter.

point(polygon) Examples

The following statement shows how to use the PostgreSQL point(polygon) function to return the center point of polygon '((0,0),(1,1),(2,0))'.

SELECT point(polygon '((0,0),(1,1),(2,0))');

         point
------------------------
 (1,0.3333333333333333)

The following statement shows how to use the PostgreSQL point(polygon) function to return the center point of polygon '(-1,1),(1,1),(1,-1),(-1,-1)'.

SELECT point(polygon '(-1,1),(1,1),(1,-1),(-1,-1)');

 point
-------
 (0,0)