[Qgis-user] raster smoothing tool?

[Nicolas Cadieux]

Salut Yann,

In QGIS, try renaming the output file instead of using the default temporary file.  I have had similar problems in the past but I am not sure if this is the same thing.  You can try saving as a tif or as .sdat.  I had funny results in the past with SAGA when using tif as output therefore I had more success saving in SAGA .sdat and then exporting that result to a tif afterwards.

Nice to know you got it working.  SAGA is nice and has rich algorithm but has the nasty habit of loading massive amounts of data to memory.  This makes it faster if you can take the memory hit.

Au plaisir!
Nicolas


> Le 22 mars 2019 à 22:45, Yann Troutet <ytroutet at selkirk.ca> a écrit :
> 
> Merci Nicolas,
> 
> I had tried the Vigra Smoothing tool from SAGA, but this simply raises the following error message:
> 
> The following layers were not correctly generated.<ul><li>C:/Users/ytroutet/AppData/Local/Temp/processing_f62d6fcc634e4d53945b3b999d33eb65/fabcc06c819f4f7684ec3ba0a75d6a0d/OUTPUT.sdat</li></ul>You can check the 'Log Messages Panel' in QGIS main window to find more information about the execution of the algorithm.
> 
> I'm using QGIS 3.4.4. Madeira and have mostly been attempting to run r.resamp.filter kernel filters. This process just outputs a new raster layer with the same pixels values, even though I've tried different 'radius' values.
> 
> I've just looked at the SAGA simple filter, and this worked just fine.
> 
> Une fois de plus merci de m'avoir suggéré les options du côté de SAGA.
> 
> yann
> >>> Nicolas Cadieux <nicolas.cadieux at archeotec.ca> 3/22/2019 6:26 PM >>>
> Hi,
> 
> That is weird.  There are low pass filter in processing.  Try one from Saga.  Then open Saga and try again.  Compare both.  If you get the same results, you will know the problem is from Saga or the raster but not from QGIS.  Then write back with the exact version of QGIS you are using, on what platform (OS, Linux, Windows...) and what algorithm you are trying. This should help us figure things out.
> 
> Nicolas
> 
>> Le 22 mars 2019 à 20:27, Yann Troutet <ytroutet at selkirk.ca> a écrit :
>> 
>> Hello,
>> 
>> Are there any raster smoothing (low-pass filtering) tools that will work in QGIS 3.  Every option that I try simply outputs a raster that has the exact same values as the original.
>> 
>> 
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