ST_PolygonFromText
Name
ST_PolygonFromText — Makes a Geometry from WKT with the given SRID. If SRID is not give, it defaults to 0.
Synopsis
geometry
ST_PolygonFromText
(
text
WKT
)
;
geometry
ST_PolygonFromText
(
text
WKT
, integer
srid
)
;
Description
Makes a Geometry from WKT with the given SRID. If SRID is not give, it defaults to 0. Returns null if WKT is not a polygon.
OGC SPEC 3.2.6.2 - option SRID is from the conformance suite
![[Note]](images/note.png)
|
|
|
If you are absolutely sure all your WKT geometries are polygons, don't use this function. It is slower than ST_GeomFromText since it adds an additional validation step. |
This method implements the
OpenGIS Simple Features
Implementation Specification for SQL 1.1.
s3.2.6.2
This method implements the SQL/MM specification. SQL-MM 3: 8.3.6
Examples
SELECT ST_PolygonFromText('POLYGON((-71.1776585052917 42.3902909739571,-71.1776820268866 42.3903701743239,
-71.1776063012595 42.3903825660754,-71.1775826583081 42.3903033653531,-71.1776585052917 42.3902909739571))');
st_polygonfromtext
------------------
010300000001000000050000006...
SELECT ST_PolygonFromText('POINT(1 2)') IS NULL as point_is_notpoly;
point_is_not_poly
----------
t