<div dir="ltr">Luca,<div><br></div><div>I'm not sure there is enough info here for me to say definitively, but does your data have noise points below ground in those regions? If so, filters.elm might help.</div><div><br></div><div>Brad</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Thu, Jul 2, 2026 at 8:22 AM Luca Delucchi via pdal <<a href="mailto:pdal@lists.osgeo.org">pdal@lists.osgeo.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear all,<br>
<br>
I'm facing a problem with filter.smrf, it creates some big artifact<br>
(unclassified point, grey, when it should be ground, brown), could I<br>
improve the output?<br>
Using different parameters or filter?<br>
<br>
Thanks a lot<br>
<br>
PS<br>
I'm using docker to run it<br>
<br>
-- <br>
ciao<br>
Luca<br>
<br>
<a href="http://www.lucadelu.org" rel="noreferrer" target="_blank">www.lucadelu.org</a><br>
_______________________________________________<br>
pdal mailing list<br>
<a href="mailto:pdal@lists.osgeo.org" target="_blank">pdal@lists.osgeo.org</a><br>
<a href="https://lists.osgeo.org/mailman/listinfo/pdal" rel="noreferrer" target="_blank">https://lists.osgeo.org/mailman/listinfo/pdal</a><br>
</blockquote></div>