[GRASS-user] Complex raster calculations with GRASS....

Markus Neteler neteler at osgeo.org
Thu Dec 13 13:31:13 PST 2012

On Tue, Dec 11, 2012 at 2:59 PM, Andranik Hayrapetyan
<andranik.h89 at gmail.com> wrote:
> Good day,
> I am trying implement paralisation for some grass task and understand in
> what cases parallelisation is needed and where it is not.
> Until now I was doing experiments with calculation of NDVI with r.mapcalc.
> But as my experiments shows, calculation of NDVI is too simple task to
> parallelise it.

How did you implement it?+

> Can you point me to a real life calculation which is more complex than NDVI
> ?  For example, if calculation of NDVI takes 10 minutes to complete on
> specified raster, I want to know a real life calculation that takes, let's
> say, 30 minutes ...

You mean with r.mapcalc? Otherwise cost surfaces or watershed calculation may
be interesting.


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