[GRASS-user] integer and discrete raster

[Frank David]

Thank you Vero,

If I well understand, r.series return always floating values. But from 
trunk r73206 we expect something different... Ok I will wait for the 
next release, and continue with a int().

But I still not understand from where r.series return such values (more 
or less 0.03) from integer... it's mysterious!

Frank

Le 9/25/18 à 2:43 PM, Veronica Andreo a écrit :
> Hello Frank,
>
> See this related thread: 
> https://lists.osgeo.org/pipermail/grass-dev/2018-August/089410.html
>
> The method sum in r.series always returns DCELL. But maybe this is 
> also a case in which a check of data type could be done beforehand, so 
> the result keeps the original data type.
>
> HTH,
> Vero
>
>
>
> El mar., 25 sept. 2018 a las 10:51, Frank David 
> (<frank.david at geophom.fr <mailto:frank.david at geophom.fr>>) escribió:
>
>     Hello all,
>
>     I've done a sum with r.series from 8 rasters previously calculated
>     with r.mapcalc. Each raster cell content is 0 or 1. So the sum
>     raster cells should have 0 to 8. I was looking at r.category to
>     set labels like "1 to 2", "3 to 4", etc. To see my raster values,
>     I've done a r.describe, and the result surprised me :
>
>     0.000000-0.031373
>     0.972549-1.003922
>     1.976471-2.007843
>     2.980392-3.011765
>     3.984314-4.015686
>     4.956863-4.988235
>     5.960784-5.992157
>     6.964706-6.996078
>     7.968627-8.000000
>
>     instead of :
>
>     0
>     1-1
>     2-2
>     ...
>     8-8
>
>     If I do int(value) with r.mapcalc in my first raster (value is
>     integer), r.describe returns integer result as expected.
>
>     Why r.describe return float values ? how they are calculated ? why
>     I must make a int() on a integer to get an integer ?
>
>     Since my values are integer, how can I force raster in CELL
>     instead of DCELL ?
>
>     Thanks to help me to understand this !
>
>     Regards,
>
>     Frank
>
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