This function sets the spatial reference system identifier (SRID) of a raster object. The SRID and its definition are stored in the spatial_ref_sys table.


raster ST_SetSrid(raster rast, integer srid);


Parameter Description
rast The raster object.
srid The SRID of the raster object.


If the raster object is stored in external mode, you must make sure that the raster object is geographically referenced and the specified SRID can be found in the spatial_ref_sys table. Otherwise, the information about the raster object cannot be updated.


update rast set rast=ST_SetSrid(rast,4326) where id=1;
(1 row)