<div dir="ltr"><br><div class="gmail_extra">Dear Micha,<br><br><br></div><div class="gmail_extra">I realized that the addon is for vector, so I converted my raster (that's what I have) to points but even when downsampled is was very slow, actually (~480000 points), I was not able to wait for it.<br></div><div class="gmail_extra">So, I created a workaround for sparse huge point clouds loaded into a raster map. The method is not exact, this is a kind of approximation (as raster is, always).<br><br><br></div><div class="gmail_extra">We start from "startvocer", created with r.in.lidar in my case:<br><br> Type of Map: raster Number of Categories: 0 <br> Data Type: FCELL <br> Rows: <b>28222</b> <br> Columns: <b> 79670 </b> <br> Total Cells: <b>2248446740</b> <br> <br><br></div><div class="gmail_extra"><br><img src="cid:ii_15d5ab7f0b97331a" alt="Szövegközi kép 2" height="196" width="464"><br><br></div><div class="gmail_extra">zoom:<br><br><img src="cid:ii_15d5ab9e57920b78" alt="Szövegközi kép 3" height="266" width="384"><br><br><br></div><div class="gmail_extra">final:<br><br><img src="cid:ii_15d5abb54770da67" alt="Szövegközi kép 5" height="211" width="357"><img src="cid:ii_15d5abaac69386e2" alt="Szövegközi kép 4" height="270" width="404"><br></div><div class="gmail_extra"><br><br><br></div><div class="gmail_extra">The final vector map in my case is one vector area.... it could now be used to set MASK for raster operations later on...<br></div><div class="gmail_extra"><br><br></div><div class="gmail_extra"><b>PROCESS (resolution degradation and buffer size /100/ should be tailored to application:</b><br></div><div class="gmail_extra"><br><br>g.region raster=startcover # original resolution is 1m<br>g.region res=10<br><br>r.resamp.stats --overwrite input=00001_rec4@kana output=00001_rec4_int method=minimum<br><br>r.buffer --o input=00001_rec4_int output=lasmaskbuf distances=100 # let the "paint" flow to fill gaps and smooth edges<br>r.mapcalc --o expression="lasmaskbuf2=if(isnull(lasmaskbuf),null(),1)" # make all values 1 in the buffer to let r.to.vect create one area<br>r.to.vect -s --overwrite input=lasmaskbuf2 output=lasmaskbufvec type=area # make vector of the buffer<br>v.generalize --overwrite input=lasmaskbufvec@kana type=area output=lasmaskbufvecgeneralized method=sliding_averaging threshold=10000 # make simpler<br>v.buffer --o input=lasmaskbufvecgeneralized@kana type=area output=final distance=-100 # cut back<br><br></div><br><div class="gmail_extra"><br></div><div class="gmail_extra">Best regards<br></div><div class="gmail_extra">Robert<br><br></div><div class="gmail_extra"><br><br></div><div class="gmail_extra"><div class="gmail_quote"><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"><br></div><div class="gmail_extra"><br><div class="gmail_quote">2017-07-19 11:56 GMT+02:00 Micha Silver <span dir="ltr"><<a href="mailto:tsvibar@gmail.com" target="_blank">tsvibar@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<div class="gmail-m_4994754603362302556m_6009817724185010318moz-cite-prefix">On 07/19/2017 11:57 AM, Robert
Kuszinger wrote:<br>
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Hope about the addon:<br>
<a class="gmail-m_4994754603362302556m_6009817724185010318moz-txt-link-freetext" href="https://grasswiki.osgeo.org/wiki/AddOns/GRASS7/vector#v.concave.hull" target="_blank">https://grasswiki.osgeo.org/wi<wbr>ki/AddOns/GRASS7/vector#v.conc<wbr>ave.hull</a><br><span class="gmail-m_4994754603362302556HOEnZb"><font color="#888888"><br><span class="gmail-HOEnZb"><font color="#888888">
<pre class="gmail-m_4994754603362302556m_6009817724185010318moz-signature" cols="72">--
Micha Silver
cell: +972-523-665918</pre>
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