I have a problem with hillshade function: I've set 315 azimuth, 45 vertical angle and 1 Z factor, but the result is very bad…
The original dem file is a .geotiff from Global Data Explorer (Aster Global DEM V2). I would like to obtain a pretty hillshade, but I don't know what is wrong.
Here the original and the screen of the hillshade result. It's 1:660.000 scale
Best Answer
I think you are using Geographic CRS not Projected CRS. Usually this hillshade output is due to you are not using a projected DEM such as UTM projection with a meter unit. You need first to reproject your DEM from geographic to UTM (or any desired projection with meter unit) and use Bilinear or Cubic resampling.
You can see the difference between unprojected hillshade and projected hillshade in the image below :
To reproject the DEM data to UTM projection (as an example), go to
Raster → Projections → Warp (Reproject)