Amazon Redshift will no longer support the use of Python UDFs after June 30, 2026. We will start enforcing it in phases. For more information on the details of Python end of life and migration options, see the blog post that was published on June 30, 2025.

ST_Area

For an input geometry, ST_Area returns the Cartesian area of the 2D projection. The area units are the same as the units in which the coordinates of the input geometry are expressed. For points, linestrings, multipoints, and multilinestrings, the function returns 0. For geometry collections, it returns the sum of the areas of the geometries in the collection.

For an input geography, ST_Area returns the geodesic area of the 2D projection of an input areal geography computed on the spheroid determined by the SRID. The unit of length is in square meters. The function returns zero (0) for points, multipoints, and linear geographies. When the input is a geometry collection, the function returns the sum of the areas of the areal geographies in the collection.

Syntax

ST_Area(geo)

Arguments

Return type

DOUBLE PRECISION

If geo is null, then null is returned.

Examples

The following SQL returns the Cartesian area of a multipolygon.

SELECT ST_Area(ST_GeomFromText('MULTIPOLYGON(((0 0,10 0,0 10,0 0)),((10 0,20 0,20 10,10 0)))'));

 st_area
---------
     100

The following SQL returns the area of a polygon in a geography.

SELECT ST_Area(ST_GeogFromText('polygon((34 35, 28 30, 25 34, 34 35))'));

     st_area
------------------
 201824655743.383

The following SQL returns zero for a linear geography.

SELECT ST_Area(ST_GeogFromText('multipoint(0 0, 1 1, -21.32 121.2)'));

 st_area
---------
       0