[GRASS-user] Profile from a random path

[Luca Casagrande]

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
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