<div dir="auto">Correct, there is no PDAL filter to isolate vegetation points amongst those classified as non-ground. Other filters, as suggested, may help to discriminate between buildings and trees, or misclassified non-ground. I've not done a lot of dense vegetation testing, but both PMF and SMRF should do reasonably well as long as points are making it all the way to the ground in the input data. Those filters, in my experience, struggle more with manmade structures than they do with vegetation.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Apr 10, 2019, 7:30 AM Luigi Pirelli <<a href="mailto:luipir@gmail.com" target="_blank" rel="noreferrer">luipir@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">I would say to filter later hag to remove spikes and isolated maximum, e.g fopr example nndistance (in 1.9) help to remove last return points that belongs to trees<div><br></div><div>just my 2c<br clear="all"><div><div dir="ltr" class="m_7715347592720623904m_730800037018140122gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><br></div><div>Luigi Pirelli<br><br>**************************************************************************************************<br>* LinkedIn: <a href="https://www.linkedin.com/in/luigipirelli" rel="noreferrer noreferrer" target="_blank">https://www.linkedin.com/in/luigipirelli</a><br>* Stackexchange: <a href="http://gis.stackexchange.com/users/19667/luigi-pirelli" rel="noreferrer noreferrer" target="_blank">http://gis.stackexchange.com/users/19667/luigi-pirelli</a><br>* GitHub: <a href="https://github.com/luipir" rel="noreferrer noreferrer" target="_blank">https://github.com/luipir</a><br>* Mastering QGIS 2nd Edition:<br>* <a href="https://www.packtpub.com/big-data-and-business-intelligence/mastering-qgis-second-edition" rel="noreferrer noreferrer" target="_blank">https://www.packtpub.com/big-data-and-business-intelligence/mastering-qgis-second-edition</a><br>* Hire me: <a href="http://goo.gl/BYRQKg" rel="noreferrer noreferrer" target="_blank">http://goo.gl/BYRQKg</a><br>**************************************************************************************************</div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, 10 Apr 2019 at 13:22, Silvia Franceschi <<a href="mailto:silvia.franceschi@gmail.com" rel="noreferrer noreferrer" target="_blank">silvia.franceschi@gmail.com</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"><div dir="ltr"><div class="gmail_default" style="font-size:small">Thanks Luigi,</div><div class="gmail_default" style="font-size:small">it is exactly what I am doing, but regarding filters, I noticed that there are many other filters and I was wondering if there were something else to use specifically for vegetation or dense cover.</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">I am also reading some papers, it is hard to find specific tests on vegetation, the buildings seems to be more interesting!!! :-D</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Hear you soon!!</div><div class="gmail_default" style="font-size:small">Ciao</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Silvia</div><div class="gmail_default" style="font-size:small"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Apr 10, 2019 at 12:47 PM Luigi Pirelli <<a href="mailto:luipir@gmail.com" rel="noreferrer noreferrer" target="_blank">luipir@gmail.com</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"><div dir="ltr">Hi silvia<div><br></div><div>with my limitated experience in this area I would do</div><div><br></div><div>1) filter only last points</div><div>2) filter with pmf or smpf... and here you have to play with parameters</div><div>reading experience, there is no a generic set of parameters, because they depend on the size of objects you want to "remove", sensor noise, terain conformation and point of view espect the terrain </div><div><br></div><div>=> you have to check the parameters :(</div><div><br></div><div>you can read may papers related with pmf... no idea about papers specific to high vegetation cover.</div><div><br></div><div>cheers</div><div><div><div dir="ltr" class="m_7715347592720623904m_730800037018140122gmail-m_-6452014731570667030gmail-m_-3876935138302524717gmail_signature"><div dir="ltr"><div><br></div><div>Luigi Pirelli<br><br>**************************************************************************************************<br>* LinkedIn: <a href="https://www.linkedin.com/in/luigipirelli" rel="noreferrer noreferrer" target="_blank">https://www.linkedin.com/in/luigipirelli</a><br>* Stackexchange: <a href="http://gis.stackexchange.com/users/19667/luigi-pirelli" rel="noreferrer noreferrer" target="_blank">http://gis.stackexchange.com/users/19667/luigi-pirelli</a><br>* GitHub: <a href="https://github.com/luipir" rel="noreferrer noreferrer" target="_blank">https://github.com/luipir</a><br>* Mastering QGIS 2nd Edition:<br>* <a href="https://www.packtpub.com/big-data-and-business-intelligence/mastering-qgis-second-edition" rel="noreferrer noreferrer" target="_blank">https://www.packtpub.com/big-data-and-business-intelligence/mastering-qgis-second-edition</a><br>* Hire me: <a href="http://goo.gl/BYRQKg" rel="noreferrer noreferrer" target="_blank">http://goo.gl/BYRQKg</a><br>**************************************************************************************************</div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, 10 Apr 2019 at 12:02, Silvia Franceschi <<a href="mailto:silvia.franceschi@gmail.com" rel="noreferrer noreferrer" target="_blank">silvia.franceschi@gmail.com</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"><div dir="ltr"><div class="gmail_default" style="font-size:small">Dear all,</div><div class="gmail_default" style="font-size:small">is there someone who is working with point cloud data to extract the DTM in areas with high vegetation cover?</div><div class="gmail_default" style="font-size:small">Do you have experience on which of the different filters available in the PDAL is better to use? which values of the parameters did you use?</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Do you know if there are papers available on applications on these use cases?</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Any suggestion is appreciated! :-D</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Regards</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small">Silvia</div><div class="gmail_default" style="font-size:small"><br></div><div class="gmail_default" style="font-size:small"><br></div><div><br></div>-- <br><div dir="ltr" class="m_7715347592720623904m_730800037018140122gmail-m_-6452014731570667030gmail-m_-3876935138302524717gmail-m_4223129948149020485gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div style="font-size:small">ing. Silvia Franceschi<br>Via Latemar, 22</div><div style="font-size:small">38030 Castello di Fiemme (TN)<br><br>tel: 0039 -3384501332</div></div></div></div></div></div></div></div>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="m_7715347592720623904m_730800037018140122gmail-m_-6452014731570667030gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div style="font-size:small">ing. Silvia Franceschi<br>Via Latemar, 22</div><div style="font-size:small">38030 Castello di Fiemme (TN)<br><br>tel: 0039 -3384501332</div></div></div></div></div></div></div>
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