[postgis-users] Get BBox from different kind of geometry

David William Bitner bitner at gyttja.org
Wed Jun 11 06:53:26 PDT 2008


For zoom-to type applications, I prefer to use ST_expand on all
geometry types.  This makes sure also that a polygon isn't butting up
completely against the edges of my maps.


On Wed, Jun 11, 2008 at 8:43 AM, doktoreas <thedoktor78 at gmail.com> wrote:
> Hello everybody,
> I have a db with different kind of geometry that I show using Geoserver and
> OpenLayers.
> For creating a simple "zoom-to-feature" function, I need to get the BBox
> value for each geometry; this is not a problem for polygon and lines ( with
> envelope function)  but, as it's normal, can't be done for point.
> My first idea is to get the point location and creating a custom BBox from
> that by adding/subtracting a fixed value to the x,y.
> Is there a better way for doing this?
> Thanks
> Luca
> --
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David William Bitner

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