ST_Envelope
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## Name

ST_Envelope — Returns the polygon representation of the extent of the raster.

## Synopsis

`geometry ST_Envelope(`raster rast`)`;

## 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

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