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I am looking for a processing tool that can remove noise selectively from a DEM (Mostly SRTM). My current workflow includes "Fill sinks" and "r.neighbours". The problem is that the tool is blind to places of abrupt slope changes and smooths the surface uniformly. I would like to apply a different amount of smoothing to areas of different slope values.

How can I do that?

Please see the attached image

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    Did you try a lowpass filter? – eurojam Jul 29 at 5:05

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