Sory, the previous post was not to this list. <br><br><div class="gmail_quote">2010/8/27 Espen Isaksen <span dir="ltr"><<a href="mailto:espen.isaksen@gmail.com">espen.isaksen@gmail.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Hi!<br>
<br>
I have a set of polygons where I have dissolved some of the polygons.<br>
So I get two sets of polygons where one set is my original data, and<br>
the other set is new polygons from the dissolve operations. Now I want<br>
to extract the remaining polygons from my original dataset which were<br>
not dissolved. I tried just a simple st_difference, but from what I<br>
understand this operation does now work on sets of polygons.<br>
<br>
Both datasets can be found here in shape format:<br>
<a href="http://dl.dropbox.com/u/8829/postgis.zip" target="_blank">http://dl.dropbox.com/u/8829/postgis.zip</a><br>
<br>
How can I extract only the remaining polygons from the original<br>
dataset. I had a look at this<br>
post(<a href="http://www.postgis.org/pipermail/postgis-users/2008-May/019511.html" target="_blank">http://www.postgis.org/pipermail/postgis-users/2008-May/019511.html</a>)<br>
in the mailing list, but I did not succeed in changing it to fit my<br>
purpose.<br>
<br>
Can anybody help me out?<br>
<br>
Kind regards,<br>
<font color="#888888">Espen Isaksen<br>
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