[GRASS-user] v.edit tool=merge

[Vincent Bain]

Thanks Markus,
indeed it works much much faster !

However on my data I notice the result is slightly different from the
one I get with  6.4, i.e. some segments don't snap to each other : where
I should have a result with 199 lines I have 217 objects. If I try to
snap them manually via wx digitizer, it fails too.
Later I noticed that when applying twice the command, the result is
finally correct (199 lines).

Vincent.

Le vendredi 23 septembre 2016 à 15:00 +0200, Markus Metz a écrit :
> On Tue, Sep 20, 2016 at 3:06 PM, Vincent Bain <bain at toraval.fr> wrote:
> > Hi,
> > on a fresh (r69498) trunk version of grass, I have a problem running a
> > v.edit command on a map.
> > Given a vector map composed of 200 contour lines splitted in roughly
> > 17000 line segments (adjacent nodes perfectly overlapping), I need to
> > "unsplit" these contours. If I try to run the following command :
> >
> >         v.edit map=contours type=line tool=merge snap=vertex -r cats=0
> >
> > it looks line it never ends, i.e. the process does not return any error,
> > RAM and CPU usages appear stable (not huge). After tens of minutes it
> > still hangs up. I finally have to interrupt, then chucking out the
> > topology-damaged map.
> 
> v.edit tool=merge hangs for zero-length lines. Such contours can occur
> on peaks and in pits. Fixed in all G7 branches with r69556-8.
> 
> Markus M
> 
> >
> > Running the same command on grass6.4 (after v.build the source map), it
> > runs successfully within some minutes.
> >
> > Before I open a ticket, would anyone wish to give a try to my data ?
> >
> > Vincent.
> >
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