[Qgis-user] Wrong result with Saga Raster calculator

[Eugenio Trumpy]

Hi Pedro,

thank you very much to have tested the computation with my test data!
You are right, I checked again the computation and actually it works.

However, I was using Saga raster calculation in a processing modeler, and one of the layer I share with you
is the resulting from a previous computation.

In other word the raster layer c=temp_recal.tif comes from a previous computation (raster calculator):
ifelse(a>0,-(0.0065*a-16),(0.0045*a+16))
where a is the layer attached, and hence c of the previous  formula is the resulting of this first computation.

E.

________________________________
Da: Pedro Venâncio <pedrongvenancio at gmail.com>
Inviato: mercoledì 31 maggio 2017 11:37
A: frippe12573; qgis-user
Oggetto: Re: [Qgis-user] Wrong result with Saga Raster calculator

Hi Eugenio,

The result with SAGA Raster Calculator seems ok here, on QGIS 2.18.9, SAGA 2.3.2, both from OSGeo4W64 (result attached).

Z_top_res.tif have values from 724.403 to 1423.553, and so, the first condition is never true. Then, it always make ((b-c)/a)*1000, and the result seems ok to me.


Pedro



2017-05-31 10:19 GMT+01:00 frippe12573 <frippe12573 at hotmail.com<mailto:frippe12573 at hotmail.com>>:
Hi Paolo,

the raster have the same size and origin.
The pixels are precisely overlapped.

I tried also r.mapcalc, but I got a worst result.
Here the output of the log:
https://pastebin.com/jNyyzHgf

E.



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