[GRASS-user] A problem using v.net.distance

[Markus Metz]

On Mon, Mar 25, 2013 at 3:29 PM, דור פרידמן <dof1985 at gmail.com> wrote:
> Hi All,
>
> I'm trying to use v.net distance as follows:
>
> I use 3 maps (2 point vectors for locations and 1 polyline vector for
> roads).
> I used v.net twice to connect points to the network as follows:
> v.net input=myroads points=fillsite output=myroads_net1 operation=connect
> thresh=6000 alayer=1 nlayer=2
> v.net input=myroads_net1 points=set1 output=myroads_net2 operation=connect
> thresh=6000 alayer=1 nlayer=2
>
> Than I have added a column to myroads_net2 named cost (double precision) and
> updated it with the value 1, since I wanted all the roads to have the same
> scale.
> Than I was using v.net.distance as follows:
> v.net.distance input=myroads_net2 output=test1 afcolumn=cost from_layer=2
> to_layer=3
>
> In the manual it is written that a table will be created and linked to the
> output map (test1) and will contain the from and to category and the
> distance. The problem is that it doesn't happen: there are no geometrics
> displayed by test1 and no tables attached to it. When I've tried to view the
> attribute tables it has printed that I've to connect it to the database by
> manage tables.
>
> What can be the problem and how can I fix it?

Can you post the output of v.category option=report for myroads_net2 and test1?

Can you also post the output of v.db.connect -p test1?

Markus M