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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D">Hi Martin<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="FR-CH" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D">From my point of view there is one big advantage of having LiDAR point clouds in a database: SQL (or probably more precise DML).
</span><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D">No more system calls or different programs to solve a problem. Just pure SQL.
</span><span lang="FR-CH" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D">One interface to rule them all: vector processing? SQL. Raster processing? SQL. Point cloud processing?
</span><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D">SQL. Combining them all together? SQL.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D">I tested Paul Ramseys work [1] with our own data. It’s really great and comfortable to work with.
</span><span lang="FR-CH" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D">But can’t say much about performance. I needed to work on a really slow fanless celeron pc with a slow harddrive.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-CH" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="FR-CH" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D">[1]:
</span><span style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D"><a href="http://workshops.boundlessgeo.com/tutorial-lidar/"><span lang="FR-CH">http://workshops.boundlessgeo.com/tutorial-lidar/</span></a></span><span lang="FR-CH" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-CH" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="FR-CH" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="FR-CH" style="font-size:10.0pt;font-family:"Verdana","sans-serif";color:#1F497D">Stefan
<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="DE" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Von:</span></b><span lang="DE" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Martin Isenburg [mailto:martin.isenburg@gmail.com]
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<b>Gesendet:</b> Freitag, 24. Juli 2015 11:55<br>
<b>An:</b> Tim Sutton<br>
<b>Cc:</b> Ziegler Stefan; QGIS Developer Mailing List<br>
<b>Betreff:</b> Re: [Qgis-developer] Postgis Pointcloud support<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hello,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I am a bit hesitant to recommend inserting LiDAR point clouds into a database (because I believe - for LiDAR or dense-matching points -- you should just only insert the shapefile outlines into a database and then run a las2las query on
those spatially indexed (amd possibly resorted) LAS / LAZ files whose outlines overlap the queried area) as this has shown not to be very performant in a large study by TU Delft involving many different spatial databases ... but in some use cases it may make
sense. The papers and relevant discussions are linked here:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><a href="http://groups.google.com/d/topic/lastools/MoYPFzFVxa8/discussion">http://groups.google.com/d/topic/lastools/MoYPFzFVxa8/discussion</a><o:p></o:p></p>
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<p class="MsoNormal"><a href="http://groups.google.com/d/topic/lastools/jkB1UK5DxN4/discussion">http://groups.google.com/d/topic/lastools/jkB1UK5DxN4/discussion</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">That said ... one case where it may make sense is when you insert once and then look-up *a lot* in small batched. Something like what Yuriv Czoli from developmentseed did will give you some pointers to get started:<o:p></o:p></p>
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<a href="http://developmentseed.org/blog/2014/08/07/processing-lidar-point-cloud/">http://developmentseed.org/blog/2014/08/07/processing-lidar-point-cloud/</a><o:p></o:p></p>
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<p class="MsoNormal"><a href="http://gist.github.com/YKCzoli/3605e014b8ed09a571e5">http://gist.github.com/YKCzoli/3605e014b8ed09a571e5</a><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Regards,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Martin<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Thu, Jul 23, 2015 at 8:11 PM, Tim Sutton <<a href="mailto:tim@kartoza.com" target="_blank">tim@kartoza.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<br>
<o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">On 22 Jul 2015, at 09:39, Ziegler Stefan <<a href="mailto:Stefan.Ziegler@bd.so.ch" target="_blank">Stefan.Ziegler@bd.so.ch</a>> wrote:<br>
<br>
Hi <br>
<br>
I just read in the changelog that there is some postgis pointcloud layers support? What does this mean? Can I load e.g. the patches as polygon into QGIS?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I tried to replicate / test etc. when working on the changeling, and couldn’t figure out how to make it do anything useful, get hold of a usable test dataset etc. Hopefully someone out there will write up a little tutorial or something.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Regards<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Tim<o:p></o:p></p>
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<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
<p class="MsoNormal">Regards<br>
Stefan <br>
<br>
Freundliche Grüsse <br>
Stefan Ziegler <br>
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<p class="MsoNormal">—<br>
<br>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif";color:black">Visit <a href="http://kartoza.com" target="_blank">http://kartoza.com</a> to find out about open source:<o:p></o:p></span></p>
<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:9.0pt;font-family:"Helvetica","sans-serif";color:black">Skype: timlinux Irc: timlinux on #qgis at <a href="http://freenode.net" target="_blank">freenode.net</a><o:p></o:p></span></p>
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