Error when merging LAZ in QGIS

[Nino Kamphuis]

Hi!

I am trying to run lasmerge in QGIS, however it gives me an output error.

Any idea what I am doing wrong?

Thanks in advance!

QGIS version: 3.28.2-Firenze

QGIS code revision: b47e00ba601

Qt version: 5.15.3

Python version: 3.9.5

GDAL version: 3.6.1

GEOS version: 3.11.1-CAPI-1.17.1

PROJ version: Rel. 9.1.1, December 1st, 2022

PDAL version: 2.4.3 (git-version: f8d673)

Algorithm started at: 2023-01-24T11:58:41

Algorithm 'lasmerge' starting…

Input parameters:

{ 'ADDITIONAL_OPTIONS' : '', 'APPLY_FILE_SOURCE_ID' : False, 'CPU64' : False, 'FILE2' : 'C:\\LAStools\\C_57HN2.LAZ', 'FILE3' : '', 'FILE4' : '', 'FILE5' : '', 'FILE6' : '', 'FILE7' : '', 'FILES_ARE_FLIGHTLINES' : False, 'GUI' : False, 'INPUT_LASLAZ' : 'C:\\LAStools\\C_57FZ2.LAZ', 'OUTPUT_LASLAZ' : 'C:/LAStools/Merged.LAZ', 'VERBOSE' : False }

LAStools command line

C:/LAStools\bin\lasmerge -i "C:\LAStools\C_57FZ2.LAZ" -i C:\LAStools\C_57HN2.LAZ -i -i -i -i -i -o "C:/LAStools/Merged.LAZ"

LAStools console output

ERROR: no output specified

Execution completed in 0.12 seconds

Results:

{'': None}

Loading resulting layers

Algorithm 'lasmerge' finished

[Kirk Waters - NOAA Federal]

It looks like your issue is all those blank entries for files to merge. Your LAStools command line is going to parse such that the -o argument is seen as the option to one of the -i flags. All those -i flags expect the next thing to be the file to input, so the pairs look sort of like this:

-i "C:\LAStools\C_57FZ2.LAZ"

-i C:\LAStools\C_57HN2.LAZ

-i -i 

-i -i 

-i -o 

"C:/LAStools/Merged.LAZ"

Thus, the -o is never seen as a flag, it's an argument to a -i flag, so no output specified.

Kirk Waters, PhD 

NOAA Office for Coastal Management

Applied Sciences Program      

‪Phone: 843-284-6962‬ (New as of 2022)    

coast.noaa.gov/digitalcoast

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[Jochen Rapidlasso]

Hi Nino,
anyway, the plugin should not add the empty -i arguments.
We will have a closer look at this next week.

As fast solution:
Just do the job using the commandline:

C:\LAStools\bin\lasmerge -i C:\LAStools\C_57FZ2.LAZ -i C:\LAStools\C_57HN2.LAZ -o C:\LAStools\Merged.LAZ

Best regards,

Jochen @rapidlasso

[Nino Kamphuis]

Thanks that works for now!

Op dinsdag 24 januari 2023 om 13:13:26 UTC+1 schreef rapid...@gmail.com: