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I am working with this DEM obtained using terraincache, it uses mapzen data. The SRC is WGS 84.

DEM File in QGIS

I ran this GDAL command to get the slope:

gdaldem slope -s 111120 dem.tif slope.tif (I had to do scaling because of the SRC)

The resulting image looks fine but it's not smooth, it has weird lines over it, like contour lines.

Slope file on QGIS

You can download the DEM file here: https://gofile.io/?c=Du7WnM

Does anyone have an idea of how to solve it?

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  • Leaving aside the scale (there is a 20% difference between parallel arc and meridian arc lengths at latitude 38 degrees), the slope calculation is correct for the source data. There are nothing to solve (although a reprojection would be convenient). Do you want to do some interpolation between source pixel values?
    – Gabriel De Luca
    Commented Mar 17, 2020 at 2:25

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