Hey Helli, On Wed, Mar 4, 2015 at 9:46 AM, Helmut Kudrnovsky <hel...@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-...@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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