[GRASS-user] Re: r.mapcalc --> 3 maps

[Gabriele N.]

Hi Carlos and thanks.

A and B do not overlap, and I should take the values of A and B also
(always). Then.....in areas that are empty, I would then put the values of
C.

I tried with    r.mapcalc "output = if((isnull(a)),b,if(isnull(b),a),c)"                 
but I lose the values of C
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