[GRASS-dev] Problems with v.net.distance

[Roberto Marzocchi]

Hi Markus,

many thannks for your changes. I think now the command is quite O.K..
Nevertheless I have encountered a new error:
I have tried with the command that you suggested me (to_type is point and
not line) and it works.


v.net.distance input=network_cat4 output=network_cat4_distance alayer=3
nlayer=4 afcolumn=lungh_a abcolumn=lungh_i flayer=4 from_cats=1-4 tlayer=4
to_type=point to_cats=5-6920 --overwrite

after I try to do the opposite, that is from the 6916 nodes of the network
(that are point!) to the firestations and it don't works

v.net.distance input=network_cat4 output=network_cat4_distance alayer=3
nlayer=4 afcolumn=lungh_a abcolumn=lungh_i tlayer=4 to_cats=1-4 flayer=4
to_type=point from_cats=5-6920 --overwrite



>> Building graph...
>> Registering arcs...
>>  100%
>> Flattening the graph...
>> Graph was built
>> ERROR: Requested feature id -1 is not reasonable(max features in vector
map
>>       <network_cat4 a ospedali_grass7>: 15747)


I don't understand why...

Thanks in advanced,
Roberto

2012/6/16 Markus Metz <markus.metz.giswork a googlemail.com>

> On Fri, Jun 15, 2012 at 6:12 PM, Roberto Marzocchi
> <roberto.marzocchi a gmail.com> wrote:
> > Dear all,
> >
> > I'm trying to use v.net.distance in grass7, which option seem be
> corrected
> > respect of teh version of grass65 (alayer, nlayer and consequently
> costs).
> >
> > First of all, I noted that the option output is reported two time, but
> this
> > can be simply corrected removing line 134 of main.c command. If needed I
> can
> > add in the svn.
> > Secondarly the program stop itself because if I correctly uderstand, the
> > number of lines not corresponding with the number of nodes.
> >
> > ERROR: Nodes not available for line 8819
>
> v.net.distance should be fixed with r52069.
>
> >
> > Unfortunately I'm not expert with vector grass libraries so I didn't
> > understand the problem..
> >
> >
> > --
> >
> > I'm using as a test the north carolina dataset and in particular I do the
> > step of the tutorial of Trento university
> > (
> http://www.ing.unitn.it/~grass/docs/tutorial_64_en/htdocs/esercitazione/network_analysis/index.html
> ) adding
> > also a 4th layer with the nodes. Attached a script to create the dataset
> > (grass70)
>
> In the test script, use
>
> v.net.distance input=network_cat4 output=network_cat4_distance
> alayer=3 nlayer=4 afcolumn=lungh_a abcolumn=lungh_i flayer=4
> from_cats=1-4 tlayer=3 to_type=line to_cats=6-6920
>
> in order to get the shortest paths from the four selected firestations
> to the network. The 'from' features are always points, I have updated
> the description and manual accordingly.
>
> Markus M
>
> >
> >
> > Cheers,
> > Roberto
> >
> >
> >
> >
> > _______________________________________________
> > grass-dev mailing list
> > grass-dev a lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/grass-dev
>
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