[GRASS-user] RE: Network Analysis output in GRASS

Markus Neteler neteler at osgeo.org
Tue Jun 9 15:01:16 EDT 2009

On Tue, Jun 9, 2009 at 6:50 AM, Donald Catanzaro,
PhD<don.catanzaro.ccm at gmail.com> wrote:
> Hi All,
> I am returning to GRASS after a 10 year hiatus and I must say that I am
> impressed !

Welcome back :)

> I am working on some simple network analysis (road distances from a point)
> and want the output to appear as concentric rings.  I think I need to use
> v.net.iso on my road network but  it appears from the manual that the output
> from v.net.iso is a line file.  I'd like to push that out to a polygon to
> get concentric rings so it looks like I need a few more processing steps.
> Like I said, it has been a long while since my GRASS4.0/4.1 days - what
> would people suggest using to push the output of v.net.iso out to a polygon
> ?  v.surf.idw, v.surf.icw, v.hull ?  Aren't these all point interpolations
> and I need to interpolate from lines ?

Wild guess: connect points with identical attribute?


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