ST_SrsName function

The ST_SrsName function takes a geometry as an input parameter and returns the name of the spatial reference system in which the specified geometry is represented.

If the specified geometry is null, then null is returned.

Syntax

Parameter

geometry: A value of type ST_Geometry or one of its subtypes that represents the geometry for which the name of the spatial reference system is returned.

Return type

VARCHAR(128)

Example

Two points are created in different spatial reference systems. The ST_SrsName function is used to find out the name of the spatial reference system that is associated with each point.


CREATE TABLE sample_points (id INTEGER, geometry, ST_Point)

INSERT INTO sample_points
  VALUES (1, ST_Point ('point (80 180)', 0) )

INSERT INTO sample_points
  VALUES (2, ST_Point ('point (-74.21450127 + 42.03415094)', 1) )

SELECT id, ST_SrsName (geometry) SRSNAME
  FROM sample_points

Results:


ID          SRSNAME
----------- ------------------------------
          1 UNSPECIFIED                                                           
          2 NAD83_SRS_1