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I am using python 3.X and I am transforming a DEM (from a raster GeoTIFF file) into a slop tif file. I am using GDAL and rasterio to do that.

Specifically, I am using the method:

gdal.DEMProcessing(output, input, 'slope')

My problem is I do not know what is the mathematics and what exact method GDAL uses to calculate the slope. I can't find the answer in the GDAL documentation.

Can anyone can point me to that?

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    Two methods are named in the documentation Use Zevenbergen & Thorne formula, instead of Horn’s formula, to compute slope & aspect. The literature suggests Zevenbergen & Thorne to be more suited to smooth landscapes, whereas Horn’s formula to perform better on rougher terrain – user30184 Sep 11 at 18:41
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    If all else fails you can read the code – Ian Turton Sep 11 at 18:51

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