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

Thu May 14 15:43:03 PDT 2020

Dear Alexander, 

Thank you for looking into it. As I said, there is no projection on the fly, my layer and the file are in EPSG:6670, as is the project. 

I will try with a selection from the large layer today!.

Best, 
Maria

> Am 14.05.2020 um 23:15 schrieb Alexandre Neto <senhor.neto at gmail.com>:
> 
> If the project is in one CRS, and the layer is in another, then the raster is transformed on-the-fly for sure.
> 
> Give it a try.
> 
> A quinta, 14/05/2020, 08:47, Priv.-Doz. Dr. Maria Shinoto <maria.shinoto at zaw.uni-heidelberg.de> escreveu:
> 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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