[GRASS-user] help to use r.mapcalc with decimal/binary (modis data)

[Glynn Clements]

Hamish wrote:

> > Oops; I could have sworn that r.mapcalc understood hex. Sorry; you'll
> > need to use decimal values, e.g.
> > 
> > r.mapcalc MASK="if(sur_refl_qc_250 & 240 == 176 , 1, null())"
> 
> so r.mapcalc can do bitwise & |? (nothing about that in the help pages)

Damn, no, that neither.

Third attempt:

	r.mapcalc MASK="if((sur_refl_qc_250 / 16) % 16 == 11 , 1, null())"

I'll look at adding the missing functionality to r.mapcalc.

-- 
Glynn Clements <glynn at gclements.plus.com>