[Qgis-user] Removing artifacts in a created DEM

[Andreas Neumann]

Hi Hernan,

I think neither of the methods you used give good results for 
interpolating terrain data (or most other interpolations).

I had good results with v.surf.rst (available in the Processing toolbox 
in the GRASS section). There are tons of options with the v.surf.rst - 
but the defaults probably work for most options. You also don't have to 
output all the raster results - just the interpolated surface.

One of the other options is the "Interpolation plugin" which comes with 
QGIS (but you have to enable it in QGIS). It appears in the raster menu 
in as "Interpolation". It offers a TIN interpolation and IDW. I think 
the TIN method is the more interesting one.

Hope this helps,
Andreas

On 17.10.2015 00:21, hersala wrote:
> 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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