[postgis-users] How do I manipulate a polygon?

[Steve Lehr]

Can you make a an outline of a county only?  I'd like to take a shape file
and compute a union shape to generate a single polygon for a whole county
any one have any code they'd share or a thought on how to union all.

Thanks

Steven Lehr
Assistant Professor
Freshmen Program
College of Engineering
Embry-Riddle Aeronautical University (LB159)
600 S. Clyde Morris Blvd.
Daytona Beach, FL 32114-3900
386-226-7740

-----Original Message-----
From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net]On Behalf Of
strk at refractions.net
Sent: Thursday, February 24, 2005 11:48 AM
To: postgis-users at postgis.refractions.net
Subject: Re: [postgis-users] How do I manipulate a polygon?


On Thu, Feb 24, 2005 at 09:35:52AM -0700, Matt Lynch wrote:
> Hi,
>
> I have a table that has a field populated with multipolygon.  How would
> I go about manipulating the polygons (e.g. shifting the polygon,
> add/drop vertices)?
>
> I did look through the online documentation and list archives, but did
> not find anything.  Please accept my appologies if  I have missed the
> obvious.

For shifting you can use the translate() function - see chapter 6.2.6
of the postgis manual.

There is currently no direct interface for adding/dropping vertices
of geometries.

--strk;

>
> Thanks,
>
> Matt
>
>
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