PostGIS
Synopsis
geometry +`*`+ST_MakeEnvelope*(`float `xmin, float ymin,
float xmax, float ymax, integer srid=unknown`)`;
Description
Creates a rectangular Polygon from the minimum and maximum values for X and Y. Input values must be in the spatial reference system specified by the SRID. If no SRID is specified the unknown spatial reference system (SRID 0) is used.
Availability: 1.5
Enhanced: 2.0: Ability to specify an envelope without specifying an SRID was introduced.
Example: Building a bounding box polygon
SELECT ST_AsText( ST_MakeEnvelope(10, 10, 11, 11, 4326) );
st_asewkt
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POLYGON((10 10, 10 11, 11 11, 11 10, 10 10))