[GRASS-user] How can I remove steps artefacts in digital

[Markus Neteler]

On Mon, Aug 14, 2023 at 9:46 PM Michael Barton <Michael.Barton at asu.edu> wrote:
>
> Perito,
>
> I don't know where you are getting your points file. But here are some suggestions.
>
> Often stepped DEMs are a result of someone starting with a scanned or vector contour map and then transforming that to a DEM using somewhat unsophisticated algorithms. So how to get rid of these.
>
> You can create a a file of points by generating random points (v.random) and assigning them elevation values from your DEM. Then you can use an interpolation algorithm like v.surf.rst or v.surf.bspline. Random points can help get rid of the steps. The fewer points, the smoother the DEM. More points will provide more topographic detail but may also show up some steps.

In addition: you find an overview (interpolation and resampling) here:
https://grasswiki.osgeo.org/wiki/Interpolation

Markus