ST_SRID — Returns the spatial reference identifier of the raster as defined in spatial_ref_sys table.
integer ST_SRID(
raster rast)
;
Returns the spatial reference identifier of the raster object as defined in the spatial_ref_sys table.
From PostGIS 2.0+ the srid of a non-georeferenced raster/geometry is 0 instead of the prior -1. |
SELECT ST_SRID(rast) As srid FROM dummy_rast WHERE rid=1; srid ---------------- 0