[postgis-users] overall bbox from some polygons

[Obe, Regina]

Select extent(the_geom) from polygontable where oid in(....)

If your geometry is 3 dimensional, I think you need to use 
extent3d.

Depending on how you are using this - to convert to a polygon with an
SRID, you may need to do

SELECT setsrid(extent(the_geom), <srid of your table goes here>) from
polygontable where oid in(....)

 

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of
Samson, Marko
Sent: Wednesday, April 25, 2007 10:34 AM
To: PostGIS Users Discussion
Subject: [postgis-users] overall bbox from some polygons

Hi,

I want to get an overall-bbox of some polygons with a select statement.
With "select envelope(the_geom)from polygontable where oid in (.....)" I
just get the separate geoms of every single polygon. Now I'm looking for
a solution to get the bbox of all these polygons.
Is there a function or other elegant way to get the 'overall envelope'
of some polygons, or do I have to create a little sorting function into
my phpscript

Bye,
Marko
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