[GRASS-user] Stream power Index calculation?

[Margherita Di Leo]

Hey Helli,

On Wed, Mar 4, 2015 at 9:46 AM, Helmut Kudrnovsky <hellik at web.de> wrote:

> >> in the book SPI is defined as:
> >>
> >>     SPI = A x tan(beta)
>

what about calculating A with r.watershed (flow accum) and tan(beta) with
r.slope.aspect (slope) and then using r.mapcalc to multiply them?

cheers,
madi

-- 
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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