This topic describes the ST_IsEmpty function. This function returns true if the input geometry object is an empty geometry object, such as a GeometryCollection object, polygon object, or point object.

Syntax

boolean  ST_IsEmpty(geometry  geomA);

Parameters

Parameter Description
geomA The geometry object that you want to specify.

Description

This function supports circular strings and curves.

Examples

  • Results returned by specifying an empty GeometryCollection object:
    SELECT ST_IsEmpty('GEOMETRYCOLLECTION EMPTY'::geometry);
 st_isempty
------------
 t
(1 row)
  • Results returned by specifying an empty polygon object:
    SELECT ST_IsEmpty('POLYGON EMPTY'::geometry);
 st_isempty
------------
 t
(1 row)