[GRASS-user] elevation profile

[Ricardo Filipe Soares Garcia da]

Hi

I think r.profile[1] can probably help you get to the output you want.
In the past I had looked into doing the exact same thing as you. I
ended up using SAGA GIS[2], as it has a predefined module that does
exactly this task, and I was in a hurry ;)

Good luck


[1] - http://grass.itc.it/grass64/manuals/html64_user/r.profile.html
[2] - http://www.saga-gis.org

On Thu, Jul 15, 2010 at 8:41 PM, John C. Tull <jctull at gmail.com> wrote:
> Hi John,
> You will likely get a more complete answer from others, but you seem to be
> on the right track with v.drape. From there, you can add a column for
> cumulative length with v.db.addcol, then run v.to.db with option=length to
> add a length column to your 3d vector. You might be able to subsample from
> there.
> Another possibility would be to run v.segment to generate points at your
> desired length interval for the original vector. Then you could run v.drape
> on the resulting points file and work from there or somehow pipe the point
> coordinates into r.profile.
> Good luck,
> John
> On Jul 15, 2010, at 12:25 PM, John Callahan wrote:
>
> Hopefully a quick question that I'm struggling with.  (I'm a long-time GIS
> user but trying to move my work to GRASS and other FOSS4G.)   I'm using
> GRASS 6.4 RC6 on Windows XP.
>
> I have a raster grid representing elevation at 2meter resolution. I have a
> line shapefile representing roads (about 20 roads total).  I would like to
> get ASCII text files of x,y,z at about 1 or 2 meter intervals along each
> road.  Any ides of what I can try?
>
> I thought v.drape might work. This converts my 2D road shapefile to 3D, but
> I'm not sure where to go from there.  And this doesn't help getting 1 or 2
> meter intervals.  I also tried r.profile but this requires input as a
> listing of x,y coordinates, not shapefiles.  I know there's a step here I'm
> missing.
>
> - John
>
> **************************************************
> John Callahan, Geographic Information Scientist
> Delaware Geological Survey, University of Delaware
> URL: http://www.dgs.udel.edu
> **************************************************
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-- 
___________________________ ___ __
Ricardo Garcia Silva