[postgis-users] Retrieve the portion of line external to polygon
Andrea Peri
aperi2007 at gmail.com
Wed Feb 16 09:53:47 PST 2011
>>I try with the ST_Difference and the ST_Intersections but both seem to
>>work only with geometries of same type.
>ST_Difference should work.
>Do you have a _small_ example showing it doesn't ?
oops sorry,
I need to explain better
The ST_Difference effectively work with two geometry of different type, but
not always retrive the external portion,
the example I post show an example of because this happened.
2011/2/16 strk <strk at keybit.net>
> On Tue, Feb 15, 2011 at 11:16:44PM +0100, aperi2007 wrote:
> > Hi,
> >
> > I need to retrieve the portion of a line external to a polygon,
> > I try with the ST_Difference and the ST_Intersections but both seem to
> > work only with geometries of same type.
>
> ST_Difference should work.
> Do you have a _small_ example showing it doesn't ?
>
> --strk;
>
> () Free GIS & Flash consultant/developer
> /\ http://strk.keybit.net/services.html
>
--
-----------------
Andrea Peri
. . . . . . . . .
qwerty àèìòù
-----------------
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/postgis-users/attachments/20110216/68962af9/attachment.html>
More information about the postgis-users
mailing list