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I tried to get a grid by interpolating LAS file using Ordinary Kriging. But the product grid has many pixels which values strongly stands out from average surface - I mean one pixel sinks nad spikes. I know that sinks can be easily filled with preprocessing modules, but I found removing spikes more complicated. Is there any automated way to remove them? For instance a module which could get rid of pixels with values that stands out from their neighborhood?

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    Perhaps this post might help?
    – Joseph
    Jan 19 '15 at 11:33
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You can try Grid – Filter→DTM Filter (slope-based). There is a very clear instruction in document "pc_processing_with_saga.pdf" by mr. Volker Wichmann, that could help you. Link below :

https://sourceforge.net/projects/saga-gis/files/SAGA%20-%20Documentation/Tutorials/GEOSTAT_2012/

It's on page 26, but in your case it's worth to read all.

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