[GRASS-user] Multiple v.net.path parameters

[J. Holden]

Well, I will have a database with thousands of points and I don't want to create thousands of vector files. Plus, I'm worried I will lose the length data if I use v.patch, which is what I am most interested in.

I will contact Daniel. Thanks for the tip.

Cheers,
John

--- On Tue, 6/30/09, Hamish <hamish_b at yahoo.com> wrote:

> From: Hamish <hamish_b at yahoo.com>
> Subject: Re: [GRASS-user] Multiple v.net.path parameters
> To: grass-user at lists.osgeo.org, "J. Holden" <stattonet at yahoo.com>
> Date: Tuesday, June 30, 2009, 8:01 PM
> 
> J. Holden wrote:
> > I am looking to use v.net.path to determine the
> distance of
> > many different points to many different other points
> on a
> > network.
> > 
> > Is it possible to send multiple parameters to
> v.net.path?
> > For instance, I have (in theory) 4 points connected to
> a
> > network. I want to find the distance of the line
> segments
> > between points 1 and 4, 2 and 4, & 3 and 4. 
> 
> run 3 times and then combine with v.patch?
> 
> > I want to:
> > run v.net.path once by passing multiple parameters;
> > get vector line output of each of these three paths
> found
> > by v.net.path in one output file;
> > calculate the distance of each line from the file
> using
> > v.to.db.
> > 
> > Since this is not a module of GRASS which I have
> worked
> > with in the past, I am wondering if this is possible.
> 
> IIUC something like this has newly been worked on as part
> of the
> Google Summer of Code project by Daniel Bundala.
> 
> http://grass.osgeo.org/wiki/GSoC_Network_Analysis
> 
> 
> you might want to contact him and act as a beta tester for
> his
> new modules. (find him on the OSGeo SoC mailing list)
> 
> 
> Hamish
> 
> 
> 
>       
> 
>