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ST_SRID

ST_SRID
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Name

ST_SRID — Returns the spatial reference identifier of the raster as defined in spatial_ref_sys table.

Synopsis

integer ST_SRID ( raster rast ) ;

Description

Returns the spatial reference identifier of the raster object as defined in the spatial_ref_sys table.

[Note]

From PostGIS 2.0+ the srid of a non-georeferenced raster/geometry is 0 instead of the prior -1.

Examples 

SELECT ST_SRID(rast) As srid
FROM dummy_rast WHERE rid=1;

srid
----------------
0