[GRASS-user] Use v.net.path to generate shortest path MATRIX?

[Jachym Cepicky]

Hi,

script would be the best. v.net.path can read start and end coordinates
from stdin:

echo "1 startx,starty,endx,endy"|v.net.path in=network out=path

it should be possible, run with v.out.ascii output from your point file

for point in `v.out.ascii in=point`; do
  echo $point |grep|sed|awk|perl|python| v.net.path in=streams out=pathX
done

jachym

Rick Reeves píše v Čt 14. 02. 2008 v 11:52 -0800:
> 
> Hello:
> 
> Perhaps someone can direct me to the correct GRASS function(s)
> for accomplishing the following analysis (Ive read the documentation,
> am still unsure which, if any, GRASS tools will do the job):
> 
> I have stream network data, in ArcMap line Shape File format, acquired from
> the USGS NHP2 dataset. The network data includes distance in Km.
> And, I have a point shape file containing the coordinates
> of lakes in the same region.
> 
> I would like to generate an 'n x n' shortest path matrix between all of 
> the 'n' lakes using the
> stream network distances.
> 
> It looks like v.net.path is the correct function to use, judging from 
> the manual page.
> My actual question: Is there a way to skip the command line input of 
> start/end points
> and use the point shape file as the source, so that a shortest path 
> matrix is created?
> 
> I suppose I could write a script to do this, but only if necessary.
> 
> Thanks for any suggestions!
> Rick Reeves
> 
> Looks like I have to represent streams and lakes as separate vector layers
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-- 
Jachym Cepicky
e-mail: jachym.cepicky gmail com
URL: http://les-ejk.cz
GPG: http://www.les-ejk.cz/pgp/jachym_cepicky-gpg.pub
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