[Qgis-user] Removing artifacts in a created DEM

[hersala]

Hello,

I'm working with a bundle of N-S and E-W distributed DGPS point transects
on gentle glacier slope. With these points I created a shp file and then I
obtained several DEMs (.tif files) using the tool Raster/Analysis/Grid
(Interpolation).
I've used Nearest Neighbor, Runing Means and Inverse Distance with several
argument values. Inverse Distance produces the best results, but there are
some artifacts that persists and makes the output unusable. They give the
impression as if the glacial slope has bumps, but on the contrary, it is
quite gentle.

Can anyone give any advice in how to proceed to reduce such artifacts.

I'm using QGIS 2.8.2-Wien in MS-Windows.

Thanks in advance.

Hernan
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