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

Donald Catanzaro, PhD don.catanzaro.ccm at gmail.com
Tue Jun 9 00:50:04 EDT 2009

Hi All,

I am returning to GRASS after a 10 year hiatus and I must say that I am 
impressed ! 

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 ?

Thanks in advance !


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