Processing - lasmerge(folder) problem

[Anete Struberga]

Hi!

I'm having troubling working the lasmerge folder tool in qgis. I have over 1000 .las files that i need to merge to use for my thesis as a DEM, but it seems like qgis doesnt really work with so many. Arcgis made a las dataset, but it seems qgis doesnt accept that, so i tried merging through qgis with the tool.

Its throws this in the tool log, but doesn't give anything in the output to use even though it finishes. 

Any advice and/or help would be greatly appreciated.

The log message: 

QGIS version: 3.40.4-Bratislava
QGIS 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. 9.5.0, September 15th, 2024
PDAL version: 2.8.3 (git-version: 56e405)
Algorithm started at: 2025-03-05T14:05:28
Algorithm 'lasmerge (folder)' starting…
Input parameters:
{ 'ADDITIONAL_OPTIONS' : '', 'APPLY_FILE_SOURCE_ID' : False, 'CPU64' : True, 'FILES_ARE_FLIGHTLINES' : False, 'GUI' : False, 'INPUT_DIRECTORY' : 'D:\\llas\\LAS', 'INPUT_WILDCARDS' : '*.laz', 'VERBOSE' : False }

LAStools command line
C:\LAStools\bin\lasmerge64 -i "D:\llas\LAS\*.laz" -cpu64
LAStools console output
The system cannot find the path specified.

Execution completed in 0.09 seconds
Results:

Loading resulting layers
Algorithm 'lasmerge (folder)' finished
QGIS version: 3.40.4-Bratislava
QGIS 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. 9.5.0, September 15th, 2024
PDAL version: 2.8.3 (git-version: 56e405)
Algorithm started at: 2025-03-05T14:17:51
Algorithm 'lasmerge (folder)' starting…
Input parameters:
{ 'ADDITIONAL_OPTIONS' : '', 'APPLY_FILE_SOURCE_ID' : False, 'CPU64' : True, 'FILES_ARE_FLIGHTLINES' : False, 'GUI' : False, 'INPUT_DIRECTORY' : 'C:\\Users\\Anete\\OneDrive - University of Latvia\\Desktop\\LU\\Maģistrs\\Diplomdarbs\\dati\\LAS\\laz', 'INPUT_WILDCARDS' : '*.laz', 'VERBOSE' : False }

LAStools command line
C:\LAStools\bin\lasmerge64 -i "C:\Users\Anete\OneDrive - University of Latvia\Desktop\LU\Maģistrs\Diplomdarbs\dati\LAS\laz\*.laz" -cpu64
LAStools console output
The system cannot find the path specified.

Execution completed in 0.07 seconds
Results:

Loading resulting layers
Algorithm 'lasmerge (folder)' finished

[Jochen Rapidlasso]

Hi Anete,

thanks for sending the log together with your question.

The log tells:

"The system cannot find the path specified."

This is because your path does not exist or because of the use of fancy chars in your path ("Maģistrs").

Try something like "c:\simple" instead.

Cheers,

Jochen @rapidlasso