[postgis-users] [!! SPAM] multipolygon to single polygon

[Mehmet Erkek]

Hi Juilen, thanks for quick answer. 

 

I have 1 geometry and 1 row on the table. this geometry is multiploygon which consists of 4 polygons.

I want to convert this mutlipolygon to one single polygon..

 

Any idea how I can do this?

I hope it is clearer now.

 

Thanks.

 

 

From: postgis-users-bounces at postgis.refractions.net [mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of ju
Sent: 26 Nisan 2012 18:02
To: PostGIS Users Discussion
Subject: Re: [postgis-users] [!! SPAM] multipolygon to single polygon

 

not clear...

1) if you have 4 polygons in 4 rows table distinct, this is not a multi object issu. for  this case use
 dissolve to group polygone into only one, this is not a topic of dump.


2) if you have 1 geometry and 1 row on the tablme, so this is a multi object topic
you must sperate the differents objet of the collection

here : http://www.postgis.org/docs/ST_GeometryN.html

--Extracting all geometries (useful when you want to assign an id)
SELECT gid, n, ST_GeometryN(the_geom, n)
FROM sometable CROSS JOIN generate_series(1,100) n
WHERE n <= ST_NumGeometries(the_geom);


best regards, julien



Le 26/04/2012 16:27, Mehmet Erkek a écrit : 

 

I have multipolygons which I would like to convert a single polygon. is there a way to do this? please check the attached image. I tried st_dump and afterwards st_union , but eventually I get a multipolygon again, not polygon. 

 

 

 

 

Mehmet Erkek

www.REIDIN.com <http://www.reidin.com/>  

 


This message is for the designated recipient only and may contain privileged, proprietary, or otherwise private information. If you have received it in error, please notify the sender immediately and delete the original. Any other use of the email by you is prohibited. Please Consider the Environment Before Printing This Email 




_______________________________________________
postgis-users mailing list
postgis-users at postgis.refractions.net
http://postgis.refractions.net/mailman/listinfo/postgis-users





-- 
Julien-Pierre Guilloux
Service scientifique - Géomatique
Parc National des Ecrins
Domaine de Charance
05 000 GAP
tél : 04.92.40.20.10
fax : 04.92.52.38.34
julien.guilloux at ecrins-parcnational.fr
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/postgis-users/attachments/20120426/34a94ca0/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.png
Type: image/png
Size: 11627 bytes
Desc: image001.png
URL: <http://lists.osgeo.org/pipermail/postgis-users/attachments/20120426/34a94ca0/attachment.png>