Hi Jennifer, yes I found that GitHub page yesterday, we are using 3.5 (of course) but am going to give it a shot next week.<div><br></div><div>Thanks for the link!<br><br><div class="gmail_quote"><div dir="ltr">On Tue, Jan 24, 2017, 03:46 Jennifer Simeon <<a href="mailto:j.simeon@geo-sat.fr">j.simeon@geo-sat.fr</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" class="gmail_msg">Hi Jean-Francois,<div class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">Don't know if it is still relevant for you after the expert replies, but there exists a laspy version I've been using with Python 3.4. You can clone it from GitHub.</div><div class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg"><a href="https://github.com/sethrh/laspy" class="gmail_msg" target="_blank">https://github.com/sethrh/laspy</a><br class="gmail_msg"></div><div class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">Best, J.</div><div class="gmail_extra gmail_msg"><br class="gmail_msg"><div class="gmail_quote gmail_msg"></div></div></div><div dir="ltr" class="gmail_msg"><div class="gmail_extra gmail_msg"><div class="gmail_quote gmail_msg">On 23 January 2017 at 20:46, Jean-Francois Prieur <span dir="ltr" class="gmail_msg"><<a href="mailto:jfprieur@gmail.com" class="gmail_msg" target="_blank">jfprieur@gmail.com</a>></span> wrote:<br class="gmail_msg"></div></div></div><div dir="ltr" class="gmail_msg"><div class="gmail_extra gmail_msg"><div class="gmail_quote gmail_msg"><blockquote class="gmail_quote gmail_msg" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr" class="gmail_msg">Thank you for the insights on how the sausage is made ;), I am not tied to Windows and am actively trying to get away from it!<div class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">Will try the docker tools if we must follow the windows route, thanks again. Will keep you posted on our progress. Keep focused on linux ;) as I stated I am removing windows from my workflow as much as possible. You did not break anything rest assured!</div><span class="m_-2869848341016239259HOEnZb gmail_msg"><font color="#888888" class="gmail_msg"><div class="gmail_msg"><br class="gmail_msg"></div><div class="gmail_msg">JF</div></font></span></div><div class="m_-2869848341016239259HOEnZb gmail_msg"><div class="m_-2869848341016239259h5 gmail_msg"><br class="gmail_msg"><div class="gmail_quote gmail_msg"><div dir="ltr" class="gmail_msg">On Mon, Jan 23, 2017 at 2:18 PM Howard Butler <<a href="mailto:howard@hobu.co" class="gmail_msg" target="_blank">howard@hobu.co</a>> wrote:<br class="gmail_msg"></div><blockquote class="gmail_quote gmail_msg" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
> On Jan 23, 2017, at 11:31 AM, Jean-Francois Prieur <<a href="mailto:jfprieur@gmail.com" class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg" target="_blank">jfprieur@gmail.com</a>> wrote:<br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
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> When the student started (almost 2 years ago), we used OSGeo4W open source tools for development. The initial workflow was awesome. Read each file with PDAL, use pgwriter to send it to postgres, calculate all the metrics in the database. Worked like a charm until pgwriter dissapeared from the osgeo4w version of PDAL (we completely understand how this can happen, this is not a complaint!) so this production chain was broken. We both did not have the time (at the time) to figure out how to install everything in linux so she decided to press forward using Python. The end product is still in Postgres, it is the initial 'reading the LAS file' part that pgwriter performed flawlessly that is causing issues now.<br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
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Well that's a bummer. Your use case is actually a good one for pgpointcloud, and you had a good workflow going. Sorry to break things for you :(<br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
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I was recently contacted by NRCan about them paying to get a 1.8.1 OSGeo4W64 libLAS build together, but I have not heard back anything after I gave a quote. I think 1.8.0 definitely had a memory management issue where it leaked file handles. IIRC, it was cleaned up in 1.8.1, but IMO pgointcloud, which you already had working is the better solution here.<br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
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An alternative that might give you traction is to use Docker <a href="http://www.pdal.io/quickstart.html" rel="noreferrer" class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg" target="_blank">http://www.pdal.io/quickstart.html</a> The PDAL docker build is feature-complete with pgpointcloud support (and most other filters), and you could use it to get data in/out of your database by calling docker commands on windows. See the Quickstart <a href="http://www.pdal.io/quickstart.html" rel="noreferrer" class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg" target="_blank">http://www.pdal.io/quickstart.html</a> for a teaser and the Workshop materials <a href="http://www.pdal.io/workshop/exercises/index.html" rel="noreferrer" class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg" target="_blank">http://www.pdal.io/workshop/exercises/index.html</a> for in-depth docker-on-windows examples. Docker might require Windows 10 for smooth usage, however.<br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
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A better solution of course is pgpointcloud support and current OSGeo4W64 binaries for windows. If you are willing to live dangerously, PDAL's continuous integration build, based off of OSGeo464, builds pgpointcloud-enabled binaries. It's just that you can only get a .zip file of the binaries, and you will need to do some %PATH% plumbing and other junk to get them to work with a current OSGeo4W64 environment. After every successful AppVeyor build, the zip file is placed at <a href="https://s3.amazonaws.com/pdal/osgeo4w/pdal.zip" rel="noreferrer" class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg" target="_blank">https://s3.amazonaws.com/pdal/osgeo4w/pdal.zip</a> This means a constantly-changing but constantly up-to-date build is available. No promises.<br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
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A note for others watching PDAL's Windows situation: the problem is not getting builds done -- they're available via AppVeyor. The problem is smooth integration with OSGeo4W64, and a convenient packaging script to push releases at OSGeo4W64. I used to manually maintain this for libLAS, and it was awful. The first few OSGeo4W64 builds were the same. The task is an integration one, not so much a development one.<br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
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> A python 3 script using libLAS opens the LAS tile, runs through each crown to find the points associated to it and stores the result as a LAS file. The issue is that an individual LAS file is created for each tree crown, when we have more than 40,000 crowns per tile the system starts swapping (windows and linux) and the process just gets very slow. Then another script reads the las points, calculates metrics which are then stored in the database. This 'clipping' operation for the tree crowns only happens once at the beginning, it is not a problem. But it would take a month right now using libLAS which is not acceptable.<br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
><br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
> So all I am looking for ;) is a linux python library that can write up tp 100,000 'mini-LAS' tree crowns from a las tile without running out of memory like libLAS does. Believe PDAL could do that quite simply via Python hence my attempts. I know that laspy exists but it is only for Python 2.<br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
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So you do indeed want to "touch the points"... but I think it would be best and cleanest to get back to pgpointcloud. You can get back there with Docker for i/o or try to bleed on the bleeding edge with the AppVeyor build and feather it into your OSGeo4W64 build.<br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
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> Thanks for any insights the list may have, keeping in mind we are relative programming noob scientists that don`t mind to work and read!<br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
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> Sorry for the book!<br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
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On the contrary, this kind of feedback lets us know how well or not well PDAL is doing the job for people. As I've said before, we have a particular set of use cases we use PDAL for, and it is encouraging that people are finding other ways to make it useful. We want to remove obvious blockers that prevent it from being so. Windows builds and integration are a tough one due to the fact that none of the PDAL developers work natively on that platform.<br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
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Thanks for the feedback!<br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
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Howard<br class="m_-2869848341016239259m_2935117779574924925gmail_msg gmail_msg">
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