ST_Envelope

Description

Returns the polygon representation of the extent of the raster in spatial coordinate units defined by srid. It is a float8 minimum bounding box represented as a polygon.

The polygon is defined by the corner points of the bounding box (( MINX , MINY ), ( MINX , MAXY ), ( MAXX , MAXY ), ( MAXX , MINY ), ( MINX , MINY ))

Examples

SELECT rid, ST_AsText(ST_Envelope(rast)) As envgeomwkt
FROM dummy_rast;

 rid |                                         envgeomwkt
-----+--------------------------------------------------------------------
   1 | POLYGON((0 0,20 0,20 60,0 60,0 0))
   2 | POLYGON((3427927 5793243,3427928 5793243,
   		3427928 5793244,3427927 5793244, 3427927 5793243))
					

See Also

ST_Envelope , ST_AsText , ST_SRID