[Qgis-user] Two LAZ file possible issues iwth some new data we received to processs

[Mike Stanton]

Hi Even, In the project it had “EPSG:4326 – WGS84” for the CRS  in the empty project and after I successfully loaded a few of the files.

I ran a controlled test today that initially ran the full set. Examination of the results showed that I could load 500 files before the programme showed the Statistics message in the log. I then setup a test by loading the 500 files that initially loaded to completion. Then from a clean load of QGIS I added file/layers one at a time until the error occurred. The test took ~5 individual files to load before the failure to generate the Statistics file occurred.  I believe that I ran into this once before on another package.  It seems there is a limit that Windows has for the number of files (Number of active Handles Issue) a process can have open at one time. With the COPC files and the normal LAZ samples maybe I exceeded that number.   More investigation is needed on my part since I did find some documented limits.

From: Mike Stanton
Sent: Thursday, February 16, 2023 11:56 PM
To: 'Even Rouault' <even.rouault at spatialys.com>; qgis-user at lists.osgeo.org
Subject: RE: [Qgis-user] Two LAZ file possible issues iwth some new data we received to processs

Thanks, Even! I will have to do it when I am on the other side of the firewall tomorrow. I was trying to be economical and bundle two issues together. I can get the data from the header of the LAZ file and also from the properties of the QGIS Project then.


From: Even Rouault <even.rouault at spatialys.com<mailto:even.rouault at spatialys.com>>
Sent: Thursday, February 16, 2023 7:11 PM
To: Mike Stanton <mfstanton at geospan.com<mailto:mfstanton at geospan.com>>; qgis-user at lists.osgeo.org<mailto:qgis-user at lists.osgeo.org>
Subject: Re: [Qgis-user] Two LAZ file possible issues iwth some new data we received to processs



Le 16/02/2023 à 23:41, Mike Stanton via QGIS-User a écrit :
I have LAZ files  for a square mile of the local area where my office is and when it is loaded under QGIS I hit two problems. It is a bit over 2000 files and I seem to have hit a capacity limit where it stops processing the images at about 200 files.  The message being output for the files is “Failed to Calculate Statistics of the Point Cloud of XXXXXXXXXXXX.LAZ”.   Breaking it into smaller pieces gets the project around the scale limits of the product because the doing only the rejected files gets me more files processed, but it is not convenient considering I expect to be processing a lot more of these files.

The other problem is that QGIS tells me I don’t have a CRS for the images and the image has a field that says “No CRS Found” in the log file and what I have is data in the header that says “COMPD_CS [“Projected”, PROJCS “UTM 15N”, GEOGCS [WGS84 …. “  but the strings have unpaired square brackets round the relevant text. Is this what may be causing the error to occur?
Can you paste the exact CRS WKT string ? Though I doubt it is related with the 200 file limit issue


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