[GRASS-user] Profile from a random path

[Jachym Cepicky]

hi,
On Wed, Dec 20, 2006 at 12:08:45PM +0100, Luca Casagrande wrote:
> On Wed, 20 Dec 2006 12:14:45 +1300
> Hamish <hamish_nospam at yahoo.com> wrote:
> 
> > doktoreas wrote:
> > > I was looking for a way to create the same output of r.profile, for a
> > > random vector line instead of 2 points..
> > > Anyone got any idea to start from?
> > 
> > 
> > If I understand correctly, r.profile will do this, just give multiple
> > coord pairs for each segment.
> > 
> > [profile=east,north[,east,north,...]]
> 
> Thanks for your answers!
> 
> I have got a path described by a vector line; i'd like to create the elevation profile for that line without
> using GUI.
> 
> I thought about this:
> 1) splitting the line in points by a certain distance, 
> 2) create an ascii file with the coordinates of each points
> 3) Use r.profile as described in the example 3 to create the profile for the ascii file.
> 
> I focused on the 3rd problem:
> 
> In the r.profile man page, in the example 3 section, it says this:
> [..]
> Example 3
> Extract a profile with coordinates provided from standard input or an external file:
> First create a points file with d.where
> d.where > saved.points
> Then pipe the points file into r.profile
> cat saved.points | r.profile input=elev.rast output=profile.pts
> [..]
> 
> The matter is that if i run the command line shown in the example, it doesn't work, cause it need -i flag
> or to set the profile= one with the coordinates of points.
> 
> Any idea?
> 
> Thanks
> Luca

v.out.ascii in=line format=standard | grep "^ [0-9]*\.*[0-9]* [0-9]*\.[0-9]*$"

would not help ?

Jachym
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Jachym Cepicky
e-mail: jachym.cepicky at centrum.cz
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