[GRASS-user] Network Topology Reconstruction

[Andre Hauptfleisch]

It turns out that v.clean actually did modify my set of vectors, but the
display module did not show the updates. When I export the vector layer to
svg the changes are visible.

So when I click the "Redraw all layers" button it doesn't show the updates.

I'm guessing I'm doing something wrong. Any ideas?


On Nov 8, 2007 8:38 PM, M S <mseibel at gmail.com> wrote:

> v.clean has various parameters.  Did you try increasing the threshold
> for the snapping?   I'd try in relatively small increments and observe
> the results, because having a snapping threshold too high will
> collapse features you dont want collapsed.
>
>
> Mark
>
> On 11/8/07, Andre Hauptfleisch <ahaupt at gmail.com> wrote:
> > Good day,
> >
> > I'm busy working on road extraction from QuickBird imagery. I've managed
> to
> > get my centrelines into a network of vectors (thanks to Grass!), but I
> would
> > like to run a topology reconstruction tool of sorts.
> >
> > I've tried the v.clean component, but had little effect. I suppose my
> > branches and gaps are to big for them to be pruned and connected.
> >
> > Does anyone know of a component, or external tool that could complete my
> > vector network?
> >
> > I've various papers on the topic, but unfortunately I don't have enough
> time
> > implement and experiment with these at this stage.
> >
> > Any hints? Ideas?
> >
> > Regards,
> > Andre
> >
> > _______________________________________________
> > grassuser mailing list
> > grassuser at grass.itc.it
> > http://grass.itc.it/mailman/listinfo/grassuser
> >
>



-- 
Groete,
Andre Hauptfleisch

M: 082 5722 469
F: 086 687 1106
E: ahaupt at gmail.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/grass-user/attachments/20071112/a566ffda/attachment.html