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

[Alexandre Neto]

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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