[Qgis-user] Hillshade as layer property vs. Processing Toolbox GDAL hillshade

[Priv.-Doz. Dr. Maria Shinoto]

Hi, 

> So the problem occurs only when creating a Hillshade, from a DEM, using the hillshade symbology?  

well, I did not try hillshade in any other case yet, so, yes.

> Have you chosen the correct a factor value?  

What is that? Perhaps there is something I miss?

> Try to use the same projection in the project and in the layer so that you have no reprojection going on.

The project is set to EPSG:6670, and the Raster layer is not projected on the fly, but from a file that is in EPSG:6670. So I think, reprojection is not the problem here. 

Thanks for checking this up, if you have an explanation about the factor value, that might help. 

Best, 
Maria Shinoto

> 
> Nicolas Cadieux
> Ça va bien aller!
> 
>> Le 13 mai 2020 à 04:31, Priv.-Doz. Dr. Maria Shinoto <maria.shinoto at zaw.uni-heidelberg.de> a écrit :
>> 
>>  Hi, 
>> 
>> Today I tried making a hillshade from the raster data you helped me out today -- after filling empty pixels, everything looks great. 
>> 
>> Now, when trying to set the layer symbology to hillshade, I got artifacts with the default setting and the recommend bilinear with medium. Looking for a solution, I found this conservation about the same issue (I think) from about 3 years ago; it seems to be a problem still today (working with QGIS 3.12).
>> 
>>       https://github.com/qgis/QGIS/issues/23859
>> 
>> So I tried the hillshade tool from GDAL in the Processing toolbox with identical setting, and everything looks great. 
>> 
>> I think that the flawed hillshade in the easily accessible Symbology dialogue needs some work or a hint to the GDAL tool in the Processing toolbox. It is frustrating for someone who is new.
>> 
>> I add screenshots from the bad results in the Properties > Symbology dialogue and the raster image from which I started. 
>> 
>> Anyway, it was great to have a solution easily at hand ;-)
>> 
>> Best,
>> Maria
>> 
>> 
>> <Bildschirmfoto 2020-05-13 um 13.58.59.jpeg>
>> 
>> <Bildschirmfoto 2020-05-13 um 14.08.53.jpeg>
>> 
>> <Bildschirmfoto 2020-05-13 um 13.59.30.jpeg>
>> 
>> 
>> 
>> 
>> 
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