I’m trying to detrend a DEM in QGIS. The best guidance that I could find on the internet was this question : Removing elevation trend over sloped surfaces?
I couldn’t understand that so I would like to know if someone could explain how to remove the tilt of a DEM. I know that the best approach is to fit a plane and then subtract this from the original DEM. But I can’t understand the criteria to create this plane and how I perform the subtraction. I can use python if needed.