[postgis-devel] ST_GeometrySplit

[George Silva]

That is exactly what i was going to say. There is no distinction between the
returned geometries, however, you need to control the right/left side of
splitting geometry to see if that geometry is a valid splitter.

In the attachment I'm sending some examples of how things are done in
ArcGIS.

George


On Fri, Mar 12, 2010 at 1:14 PM, strk <strk at keybit.net> wrote:

> On Thu, Mar 11, 2010 at 01:52:22PM -0800, Martin Davis wrote:
> > Not really...  all I can think of to do in this case is to choose one or
> > other direction as primary, and return ambiguous cases as that
> > direction.  Really it has to be up to the user to provide reasonable
> > input - you can't expect to give a sensible answer to a nonsensical
> > question.
>
> I start to think the whole "left/right" question is nonsensical.
> I've taken a look at how qgis implements "split" tool.
> There, the split just returns all elements with no distinction.
>
> --strk;
>
>  ()   Free GIS & Flash consultant/developer
>  /\   http://strk.keybit.net/services.html
> _______________________________________________
> postgis-devel mailing list
> postgis-devel at postgis.refractions.net
> http://postgis.refractions.net/mailman/listinfo/postgis-devel
>



-- 
George R. C. Silva

Desenvolvimento em GIS
http://blog.geoprocessamento.net
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/postgis-devel/attachments/20100312/3e3c01d4/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: split_tests.zip
Type: application/zip
Size: 217223 bytes
Desc: not available
URL: <http://lists.osgeo.org/pipermail/postgis-devel/attachments/20100312/3e3c01d4/attachment.zip>