[GRASS-user] Raster - assign interpolated values into range

[Moritz Lennert]

On 26/02/19 02:23, Francois Chartier wrote:
> doesnt work with 3d raster. only takes in 2d. i did it with access, more 
> tedious but it works.  i should be able to do this with the attribute 
> table directly but havent tried yet.

A raster doesn't have an attribute table, so this is not a solution. 
r3.mapcalc with nested rules such as this should work:

if(map >=0.01 && map < 0.5, 0.25, if(map < 1, 0.75, if(etc)))

But I do believe that r.reclass and r.recode are fundamental modules 
that should also exist for r3. So, I would suggest filling in an 
enhancement request ticket in trac.

Moritz

> 
> On Mon, Feb 25, 2019, 05:57 Moritz Lennert <mlennert at club.worldonline.be 
> <mailto:mlennert at club.worldonline.be> wrote:
> 
>     On 23/02/19 23:16, Francois Chartier wrote:
>      > What about if i dont want constant spacing but at certain ranges?
> 
>     Have you tried r.recode as Vero suggested ?
> 
>     Moritz
> 
>      >
>      > Le sam. 23 févr. 2019 à 11:00, Veronica Andreo
>     <veroandreo at gmail.com <mailto:veroandreo at gmail.com>
>      > <mailto:veroandreo at gmail.com <mailto:veroandreo at gmail.com>>> a
>     écrit :
>      >
>      >
>      >
>      >     El sáb., 23 feb. 2019 12:17, Markus Metz
>      >     <markus.metz.giswork at gmail.com
>     <mailto:markus.metz.giswork at gmail.com>
>      >     <mailto:markus.metz.giswork at gmail.com
>     <mailto:markus.metz.giswork at gmail.com>>> escribió:
>      >
>      >
>      >
>      >         On Sat, Feb 23, 2019 at 1:45 PM Francois Chartier
>      >         <fra.chartier at gmail.com <mailto:fra.chartier at gmail.com>
>     <mailto:fra.chartier at gmail.com <mailto:fra.chartier at gmail.com>>> wrote:
>      >          >
>      >          > Hi,
>      >          >
>      >          > After creating a raster (2 or 3d) is there a way that
>      >         interpolated values (floats) can be assigned a specific value
>      >         based on range. example: 0.01, 0.2 0.52, 0.67, 0.99, values
>      >         between 0.01 and 0.5 assign 0.25; values between 0.5 and 1,
>      >         assign 0.75.
>      >
>      >         if you want to assign values to 0.25, 0.75, 1.25, 1.75, etc.,
>      >         i.e. new values with a constant spacing of 0.5, you can use
>      >
>      >         r.mapcalc "output = round(input, 0.5, 0.25)"
>      >
>      >
>      >     Ah! So cool!! 8)
>      >
>      >
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> 
>