[GRASS-user] remove line segment from a line vector

[matteo marcantonio]

Hi Markus,

2014-11-05 9:59 GMT+01:00 Markus Metz <markus.metz.giswork at gmail.com>:

> On Tue, Nov 4, 2014 at 11:17 PM, matteo marcantonio
> <matteo.marcantonio at fmach.it> wrote:
> > Hello list,
> >
> > I'm writing since I need to clean a line vector (road network) removing
> all
> > the line segments not connected to other segments. I guess that I need to
> > remove all the segment that have valence = 0.
> >
> > I need to remove them to perform a network distance analysis avoiding the
> > issue of unreachable nodes.
> >
> > Is there any way to do it?
>
> You could use v.net.alloc with one node and then extract the allocated
> network. This will automatically discard all lines not connected to
> this node.
>

This is a good suggestion but it is not exactly what I need.

I need to connect all my nodes to the main road network avoiding that a
node is connected to a 'dead road segment' (being unreachable by
v.net.distance).

So I need to clean my road network, removing all the 'isolated road
segment' (or 'valence=0).

Any suggestion?


> Markus M
>
> >
> > Thanks for any help
> >
> > Matteo
>


>
>
Matteo


> > --
> > --
> > Matteo Marcantonio
> >
> > PhD Candidate
> > GIS & Remote Sensing
> > Fondazione Edmund Mach (FEM) - Research & Innovation Centre (CRI)
> >
> > matteo.marcantonio at fmach.it
> >
> > +39 461615669 (Office)
> > +39 3204240538 (Mobile)
> >
> > http://gis.cri.fmach.it
> >
> >
> > _______________________________________________
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>



-- 
-- 
Matteo Marcantonio

*PhD Candidate*
*GIS & Remote Sensing*
*Fondazione Edmund Mach (FEM) - Research & Innovation Centre (CRI)*

matteo.marcantonio at fmach.it

+39 461615669 (Office)
+39 3204240538 (Mobile)

http://gis.cri.fmach.it <http://gis.cri.fmach.it/people/>
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