Amazon Redshift will no longer support the creation of new Python UDFs starting November 1, 2025. If you would like to use Python UDFs, create the UDFs prior to that date. Existing Python UDFs will continue to function as normal. For more information, see the blog post .

ST_GeogFromText

ST_GeogFromText constructs a geography object from a well-known text (WKT) or extended well-known text (EWKT) representation of an input geography.

Syntax

ST_GeogFromText(wkt_string)

Arguments

Return type

GEOGRAPHY

If the SRID value is set to the provided value in the input. If SRID is not provided, it is set to 4326.

If wkt_string is null, then null is returned.

If wkt_string is not valid, then an error is returned.

Examples

The following SQL constructs a polygon from a geography object with an SRID value.

SELECT ST_AsEWKT(ST_GeogFromText('SRID=4324;POLYGON((0 0,0 1,1 1,10 10,1 0,0 0))'));

  st_asewkt
------------------------------------------------
 SRID=4324;POLYGON((0 0,0 1,1 1,10 10,1 0,0 0))
 

The following SQL constructs a polygon from a geography object. The SRID value is set to 4326.

SELECT ST_AsEWKT(ST_GeogFromText('POLYGON((0 0,0 1,1 1,10 10,1 0,0 0))'));

 st_asewkt
------------------------------------------------
 SRID=4326;POLYGON((0 0,0 1,1 1,10 10,1 0,0 0))