[Qgis-user] raster smoothing tool?

[Paolo Cavallini]

Hi Nicolas, Yann.
Please remember, if the issue is confirmed, to open a ticket on
https://issues.qgis.org/
Thanks.

On 23/03/19 06:52, Nicolas Cadieux wrote:
> 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
> <mailto: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 <mailto: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
>> <mailto: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.
>>>
>>>
>>> -- 
>>> This message has been scanned for viruses and dangerous content by
>>> *Selkirk College-E.F.A. Project*, and is believed to be clean. 
>>> _______________________________________________
>>> Qgis-user mailing list
>>> Qgis-user at lists.osgeo.org <mailto:Qgis-user at lists.osgeo.org>
>>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
>>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
> 
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
> 

-- 
Paolo Cavallini - www.faunalia.eu
QGIS.ORG Chair:
http://planet.qgis.org/planet/user/28/tag/qgis%20board/