ST_Polygon

Syntax

geometry ST_Polygon(geometry aLineString, integer srid);

Parameters

Usage notes

ST_Polygon does not accept MultiLineString inputs. To build a polygon from a MultiLineString, use ST_LineMerge to merge it into a single LineString.

• To construct a polygon with holes, use ST_MakePolygon instead.

• ST_Polygon supports 3D geometries and preserves the Z coordinate of the input geometry.

Examples

Create a 2D polygon.

SELECT ST_AsEWKT(ST_Polygon(ST_GeomFromText('LINESTRING(1 2,3 4,5 6,1 2)'), 4326));

Output:

              st_asewkt
--------------------------------------
 SRID=4326;POLYGON((1 2,3 4,5 6,1 2))
(1 row)

See also

• ST_AsEWKT — converts a geometry to EWKT format

• ST_GeomFromText — constructs a geometry from a WKT string

• ST_LineMerge — merges a MultiLineString into a single LineString

• ST_MakePolygon — constructs a polygon with optional interior rings (holes)