This topic describes the ST_PointFromWKB function. This function constructs a point object by using a Well-Known Binary (WKB) string.

Syntax

geometry  ST_GeomFromWKB(bytea  geom);
geometry  ST_GeomFromWKB(bytea  geom , integer  srid);

Parameters

Parameter Description
geom The WKB string that you want to specify.
srid The spatial reference identifier (SRID) of the point object.

Description

  • If you do not specify an SRID, the SRID defaults to 0.
  • If the WKB string that you specify does not represent a point object, this function returns NULL.
  • This function supports 3D objects and does not discard the z-index of the geometry object that is constructed.
  • This function supports circular strings and curves.

Examples

SELECT ST_AsEWKT(ST_GeomFromWKB(E'\\x01010000000000000000c05d400000000000004440'));
   st_asewkt
---------------
 POINT(119 40)
(1 row)