[Qgis-user] problème lors de l'export d'un nuage de points (LIDAR HD) en MNT

[Pascal WISSENBERG]

Hi Andrea,

I installed version 3.40.4 ltr and when I use the same "export to 
raster" algorithm, I get a new message:

/QGIS Version: 3.40.4-Bratislava
Code Revision: 4dd7d7e969
Qt Version: 5.15.13
Python Version: 3.12.9
GDAL Version: 3.10.2
GEOS Version: 3.13.0-CAPI-1.19.0
Proj Version: Rel. 9.5.1, December 1st, 2024
PDAL version: 2.8.3 (git-version: 56e405)
Algorithm started at: 2025-12-14T14:13:01
Starting algorithm 'Export to raster (using triangulation)'…
Input parameters:

{ 'FILTER_EXPRESSION' : 'Classification = 2 OR 6', 'FILTER_EXTENT' : 
None, 'INPUT' : 'copc://E:/My Documents/QGIS/LIDAR 
tiles/LHD_FXX_0801_6398_PTS_LAMB93_IGN69.copc.laz', 'ORIGIN_X' : None, 
'ORIGIN_Y' : None, 'OUTPUT' : 'E:/My Documents /QGIS/dalles 
MNT/0801-6398k.tif', 'RESOLUTION': 0.05, 'TILE_SIZE': 1000 }

wrench command: C:/program files/QGIS 
3.40.4/apps/qgis-ltr/./pdal_wrench.exe to_raster_tin "--input=E:/My 
Documents/QGIS/LIDAR slabs/LHD_FXX_0801_6398_PTS_LAMB93_IGN69.copc.laz" 
"--output=E:/Mes Documents/QGIS/dalles MNT/0801-6398k.tif" 
--resolution=0.05 --tile-size=1000 "--filter=Classification == 2 ||

The process stopped so unexpected
Execution failed after 2.89 seconds

Loading result layers
The following layers were not generated correctly.

• E:/My Documents/QGIS/dalles MNT/0801-6398k.tif
You can check the 'Log Messages Panel' in the QGIS main window to find 
more information about the algorithm execution./

Thank you in advance for your suggestion.

Best regards.

PW



Le 14/12/2025 à 08:42, Andrea Giudiceandrea a écrit :
>> Pascal WISSENBERG p.wissenberg at orange.fr
>> Sat Dec 13 01:51:31 PST 2025
>
>> j'utilise QGis 3.34.5 et depuis quelques jours, lorsque je veux 
>> exporter un fichier LIDARHD de l'IGN vers un raster (en utilisant la 
>> triangulation) pour obtenir un fichier MNT, j'ai un retour:
>> /Warning 1: Can't open E:/ Mes Documents/QGIS/ Dalles 
>> MNT\0887-6754m\0_0.tif. Skipping it/     par exemple.
>
> Hi Pascal,
> actually you are using QGIS 3.44.5, according to the provided log.
>
> Unfortunately, it looks like there is an issue when using the PDAL 
> "Export to raster (using triangulation)" processing algorithm running 
> the QGIS 3.44.5 and QGIS LTR 3.40.13 on Windows in order to convert a 
> COPC file to a GeoTIFF file.
>
> You should be able to perform the conversion on Windows 10 running a 
> previous QGIS version, like QGIS LTR 3.40.7 [1].
>
> Best regards.
>
> Andrea Giudiceandrea
>
>
> [1] https://qgis.org/downloads/QGIS-OSGeo4W-3.40.7-1.msi
>
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