ST_Transform - Amazon Redshift
SyntaxArgumentsReturn typeExamples

ST_Transform

ST_Transform returns a new geometry with coordinates that are transformed in a spatial reference system defined by the input spatial reference system identifier (SRID).

Syntax

ST_Transform(geom, srid)

Arguments

geom

A value of data type GEOMETRY or an expression that evaluates to a GEOMETRY type.

srid

A value of data type INTEGER that represents an SRID.

Return type

GEOMETRY.

The SRID value of the returned geometry is set to srid.

If geom or srid is null, then null is returned.

If the SRID value associated with the input geom does not exist, then an error is returned.

If srid does not exist, then an error is returned.

Examples

The following SQL transforms the SRID of an empty geometry collection. 

SELECT ST_AsEWKT(ST_Transform(ST_GeomFromText('GEOMETRYCOLLECTION EMPTY', 3857), 4326));

             st_asewkt
------------------------------------
 SRID=4326;GEOMETRYCOLLECTION EMPTY

The following SQL transforms the SRID of a linestring. 

SELECT ST_AsEWKT(ST_Transform(ST_GeomFromText('LINESTRING(110 40, 2 3, -10 80, -7 9, -22 -33)', 4326), 26918));

                                                                                            st_asewkt
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 SRID=26918;LINESTRING(73106.6977300955 15556182.9688576,14347201.5059964 1545178.32934967,1515090.41262989 9522193.25115316,10491250.83295 2575457.28410878,5672303.72135968 -5233682.61176205)

The following SQL transforms the SRID of a polygon. 

SELECT ST_AsEWKT(ST_Transform(ST_GeomFromText('POLYGON Z ((-10 10 -7, -65 10 -6, -10 64 -5, -10 10 -7), (-11 11 5, -11 12 6, -12 11 7, -11 11 5))', 6989), 6317));

                                                                                                                                                                                                                      st_asewkt
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
 SRID=6317;POLYGON Z ((6186430.2771091 -1090834.57212608 1100247.33216237,2654831.67853801 -5693304.90741276 1100247.50581055,2760987.41750022 -486836.575101877 5709710.44137268,6186430.2771091 -1090834.57212608 1100247.33216237),(6146675.25029258 -1194792.63532103 1209007.1115113,6125027.87562215 -1190584.81194058 1317403.77865723,6124888.99555252 -1301885.3455052 1209007.49312929,6146675.25029258 -1194792.63532103 1209007.1115113))