@ — Returns TRUE if A's bounding box is contained by B's. Uses double precision bounding box.
boolean @( raster  A ,  raster  B );
boolean @( geometry  A ,  raster  B );
boolean @( raster  B ,  geometry  A );
The @ operator returns TRUE if the bounding box of raster/geometry A is contained by bounding box of raster/geometr B. 
                 
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                 This operand will use spatial indexes on the rasters.  | 
            
Availability: 2.0.0 raster @ raster, raster @ geometry introduced
Availability: 2.0.5 geometry @ raster introduced