lasmerge with large tiled file

Skip to first unread message

Gregor Schmucki

Jul 16, 2021, 11:57:16 AM7/16/21
to LAStools - efficient tools for LiDAR processing


I'm working with a large UAV photogrammetric dataset.
To speed up the calculation time, I have tiled my dataset and tried to run it on tiles.

Unfortunately an error was raised while running lasmerge:
lasmerge64 -i *_vegindex_2G-RB_green_c_height_ground_a.laz *_vegindex_2G-RB_green_c_height.laz -o* _merge.laz

My aim is to merge each tile seperatly and not to merge all tiles together to one file.
In a following step, I'm removing all dublicates in each tile with lasduplicate.

Many thanks for your help.

All the Best,

Martin Isenburg

Jul 16, 2021, 1:00:08 PM7/16/21
to LAStools - efficient command line tools for LIDAR processing

The way lasmerge works is that it will take a number of files as input and produce a single output file. The way you use the wildcard * above, seemingly hoping that each two input files with a certain name will be merged into one output file with the renaming handling implicitly is not going to happen. You will have to run as many individual lasmerge calls as you have pairs of files.



Download LAStools at
Be social with LAStools at
Manage your settings at
You received this message because you are subscribed to the Google Groups "LAStools - efficient tools for LiDAR processing" group.
To unsubscribe from this group and stop receiving emails from it, send an email to
To view this discussion on the web visit

Gregor Schmucki

Jul 16, 2021, 6:30:19 PM7/16/21
to LAStools - efficient tools for LiDAR processing
many thanks for your fast answer!
I implemented the task now in a python script, which works out nicely.

many thanks,
Reply all
Reply to author
0 new messages