[GRASS-dev] casting row buffer in memory

Moritz Lennert mlennert at club.worldonline.be
Mon Oct 6 07:57:33 PDT 2014

On 06/10/14 16:14, Pietro wrote:
> On Mon, Oct 6, 2014 at 3:17 PM, Moritz Lennert
> <mlennert at club.worldonline.be> wrote:
>> On 06/10/14 14:54, Pietro wrote:
>>> Trying to circumvent the r.mapcalc min/max limit,
>> Just out of curiosity: why don't you just use r.recode or r.rescale ?
> r.rescale was my first option, but it just reclassify in two
> categories 1 and 255.

r.rescale assumes that input is integer, so if you feed it values 
between 0 and 1 then yes, but using the NC data as example and feeding 
it the elevation data directly:

r.rescale elevation out=elevation_0_255 to=0,255

gives the expected result.

> I didn't thought about r.recode...but I think that easier combining r.info.

Why would you need r.info for that ?

Dividing by the max and then rescaling should give the same result as 
rescaling from the original values... All you are doing is dividing all 
values by a constant before rescaling.


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