[postgis-users] Mapping from x max, ymax, xmin, ymin

[Richard White]

Hi Nicolas,

That's perfect, just what I needed.

Thanks very much.

Regards,

Richard.

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of
Nicolas Ribot
Sent: 06 June 2011 11:27
To: PostGIS Users Discussion
Subject: Re: [postgis-users] Mapping from x max, ymax, xmin, ymin

> Hi,
>
> I have a table with 4 columns, x max, ymax, xmin, ymin coordinates for
> the corner points of rectangles.
>
> Is there a way / function to convert these into a rectangle / polygon?
>
> Thanks,
>
> R.
>

Hi Franck,

Sure:

select st_makeBox2d(
   st_makepoint(xmin, ymin),
   st_makepoint(xmax, ymax))

will give you a BOX2D, ie a rectangle
the same query, cast as a geometry, will convert it to a POLYGON (5
coordinates):

select astext(st_makeBox2d(
   st_makepoint(0, 1),
   st_makepoint(2, 3))::geometry)

Nicolas
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