remove_vlr in las2las

[Tobbe Helgesson]

Hi, Im trying to get a bat-file to open all .las-files and remove Variable Length Records (VLR) in header with the help of las2las.exe.

I could not get las2las to open the files remove vlr and save it again, had to make it do temp-files.

This is my current script:

@ECHO OFF

TITLE Remove VLR

FOR /r %%X IN (*.las) DO ( 

    ECHO Handling %%X

    las2las.exe %%X -remove_vlr 0 -o %%X.temp

    MOVE /Y "%%X.temp" "%%X"

)

pause

Problem is that the outcome somehow is .txt files and not .las anymore.
Anyone with tips for a beginner? :) 

// Tobbe

[Kirk Waters - NOAA Federal]

Tobbe,

The problem is that las2las is determining your output type based on the file extension (.temp in this case). I'd suggest using a temp directory and making an output file with the same name as the input file. So, you'd have lines like:

las2las.exe %%X -remove_vlr 0 -o tempdir\%%X

move /Y "tempdir\%%X" "%%X"

Kirk Waters, PhD                     | NOAA Office for Coastal Management

Applied Sciences Program      | 2234 South Hobson Ave
843-740-1227                          | Charleston, SC 29405    

coast.noaa.gov/digitalcoast

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[Nicolas Cadieux]

Hi,
Not sure but las2las probably needs a .las or .laz extension. Others "may" be interpreted as you trying to export as a text file (like if you are using las2txt).  I am speculating here. Try sending the results of the bat file in another directory using the .las extension.

Nicolas

--

[Tobbe Helgesson]

Hi Nicolas!

Sending the file to another directory would work for me. How would the code for that command look like? Im so new to this.
At this moment i use this code:

@ECHO OFF

TITLE Remove VLR

FOR /r %%X IN (*.las) DO ( 

    ECHO Handling %%X

    las2las.exe %%X -remove_vlr 0 

)

pause

It removes the VLRs as it should but creating new las-files with the VLRs not overwriting current.

Can i add something here to make it go to a new directory and not make copies in the same directory so the name not change. 
Every file get a copy with the same name +"_1" in the end.

Regards, Tobbe

[Martin Isenburg]

Hello Tobbe,

you will have to create this temporary directory first with 'mkdir' in order to have LAStools output to it. Rather than looping in your batch script you could simply use a wild-card such as:

mkdir temp

las2las -i *.las -remove_vlr 0 -odir temp

now you can also run on multiple cores:

las2las -i *.las -remove_vlr 0 -odir temp -cores 4

but using LAS you will quickly be I/O bound so to make really use of all your cores it may be better to use LAZ:

las2las -i *.laz -remove_vlr 0 -odir temp -olaz -cores 4

Regards,

Martin @rapidlasso

PS: Here the change in your script. See the 'example_batch_script' folder that is part of the LAStools.zip distribution for ideas how to write LAStools batch scripts ...

@ECHO OFF

TITLE Remove VLR

rmdir temp /s /q

mkdir temp

FOR /r %%X IN (*.las) DO ( 

    ECHO Handling %%X

    las2las.exe %%X -remove_vlr 0 -odir temp

)

pause