ST_Envelope

Calculates the minimum bounding rectangle that contains the specified GEOMETRY object.

Behavior type

Syntax

ST_Envelope( g )

Arguments

g

Spatial object for which you want to find the minimum bounding rectangle, type GEOMETRY

Returns

GEOMETRY

Supported data types

Data Type

GEOMETRY

Point

Yes

Multipoint

Yes

Linestring

Yes

Multilinestring

Yes

Polygon

Yes

Multipolygon

Yes

GeometryCollection

Yes

Examples

The following example shows how to use ST_Envelope.

Returns the minimum bounding rectangle:

=> SELECT ST_AsText(ST_Envelope(ST_GeomFromText('POLYGON((0 0,1 1,1 2,2 2,
   2 1,3 0,1.5 -1.5,0 0))')));
                 ST_AsText
-------------------------------------------
 POLYGON ((0 -1.5, 3 -1.5, 3 2, 0 2, 0 -1.5))
(1 row)