[GRASS-user] Uniform random raster

[Thomas Adams]

Giuseppe,

Unless I have misunderstood, in GRASS use r.mapcalc...

First set you region for your area of interest, for example:

g.region -dp e=2614612.5 w=1423987.5 n=-4624387.5 s=-5862637.5

Then:
r.mapcalc expression="outputMap=25.4"

where 25.4 is your value of interest, and finally:

r.out.gdal input=outputMap output=outputFileName format=GTiff

Best,
Tom

On Mon, Feb 15, 2016 at 9:33 PM, Giuseppe Amatulli <
giuseppe.amatulli at gmail.com> wrote:

> Hi,
> I would like to create an uniform random raster, similar to what i would
> obtain in R with the following code
>
> raster=raster(matrix(runif(54210, max=50, min=-50, 139,390) , ...........)
> writeRaster(raster,filename=random.tif",formats=GTiff,overwrite=TRUE)
>
> I read the explanation of
> https://grass.osgeo.org/grass7/manuals/r.random.surface.html
> and also r.mapcalc - random (a,b)
> but I'm not sure if one of them produce the same concept/result.
>
> Any input? or better explanation
>
> Thanks
> Best
> Giuseppe
>
> --
> Giuseppe Amatulli, Ph.D.
>
> Department of Ecology and Evolutionary Biology, Yale University.
> Jetz Lab, OML Room 405
>
> P.O. Box 208106
> 165 PROSPECT ST
> New Haven, CT 06520-8106
> Teaching: spatial-ecology.net
> Work:  http://sbsc.yale.edu/giuseppe-amatulli
> <http://www.spatial-ecology.net>
>
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-- 
Thomas E Adams, III
2330 Jack Warner PKWY, #334
Tuscaloosa, AL 35401

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