ST_PointFromText
Name
ST_PointFromText — Makes a point Geometry from WKT with the given SRID. If SRID is not given, it defaults to unknown.
Synopsis
geometry
ST_PointFromText
(
text
WKT
)
;
geometry
ST_PointFromText
(
text
WKT
, integer
srid
)
;
Description
Constructs a PostGIS ST_Geometry point object from the OGC Well-Known text representation. If SRID is not give, it defaults to unknown (currently 0). If geometry is not a WKT point representation, returns null. If completely invalid WKT, then throws an error.
![[Note]](images/note.png)
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There are 2 variants of ST_PointFromText function, the first takes no SRID and returns a geometry with no defined spatial reference system. The second takes a spatial reference id as the second argument and returns an ST_Geometry that includes this srid as part of its meta-data. The srid must be defined in the spatial_ref_sys table. |
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If you are absolutely sure all your WKT geometries are points, don't use this function. It is slower than ST_GeomFromText since it adds an additional validation step. If you are building points from long lat coordinates and care more about performance and accuracy than OGC compliance, use ST_MakePoint or OGC compliant alias ST_Point . |
This method implements the
OpenGIS Simple Features
Implementation Specification for SQL 1.1.
s3.2.6.2 - option SRID is from the conformance suite.
This method implements the SQL/MM specification. SQL-MM 3: 6.1.8