[GRASS-user] mountain ridges extraction from DEM

[Margherita Di Leo]

Hi Wolfgang,

On Tue, May 19, 2015 at 2:09 AM, Wolfgang <wollez at gmx.net> wrote:

> Hello,
> I would like to know if it is possible (and how) to generate the view to
> mountain ridges as shown in
> http://www.viewfinderpanoramas.org/panoramas.html
> There are also nowadys some apps for smartphones which does the same.
> I already found r.horizon but this is, at least as I understand, only the
> view of the horizon and not all ridges.
> I also found a paper on automatic ridge extraction, but it seems that this
> never was included to grass:
>
> http://www.ing.unitn.it/~grass/conferences/GRASS2002/proceedings/proceedings/pdfs/Frigeri_Alessandro_2.pdf
>

Just a wild, not tested idea. You could try "reversing" the DEM and using
the algorithm for stream extraction  ..?

cheers,
Margherita

Many thanks
> Wolfgang
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-- 
Best regards,

Dr. Margherita DI LEO
Scientific / technical project officer

European Commission - DG JRC
Institute for Environment and Sustainability (IES)
Via Fermi, 2749
I-21027 Ispra (VA) - Italy - TP 261

Tel. +39 0332 78 3600
margherita.di-leo at jrc.ec.europa.eu

Disclaimer: The views expressed are purely those of the writer and may not
in any circumstance be regarded as stating an official position of the
European Commission.
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