ST_UpperLeftY — Retorna a coordenada Y superior esquerda na ref. espacial projetada.
float8 ST_UpperLeftY(raster rast);
Retorna a coordenada Y superior esquerda na ref. espacial projetada.
SELECT rid, ST_UpperLeftY(rast) As uly FROM dummy_rast;
rid | uly -----+--------- 1 | 0.5 2 | 5793244