Execute las2txt.exe in existing Python script

[Colin Werle]

Hello, 

I am relatively new to Python scripting, and I would like to add the las2txt (using the parameters of [-i, -sep space,  -o, -parse xyzRBGi, -scale_rgb_down]) once I have finished colorizing las using ArcGIS.

Are there any suggestions for implementing this las2txt tool into my script? 

Thanks!

Colin

[David Friedrich]

Hi Colin,

the first option would be to go to your LAStoolsArcGIS_toolbox\scripts folder and take a look at the las2text.py.

At the beginning it looks complicated, but it isn't. 

I won't explain all but i will try to give you an idea.

# this defines the LAStoos\bin\las2txt.exe path and writes it to an array

lastools_path = lastools_path + "\\bin"

las2txt_path = lastools_path+"\\las2txt.exe"

command = ['"'+las2txt_path+'"']

# add input LiDAR

command.append("-i")

command.append('"'c:\INPUTFOLDER'"')

# add parameters

command.append("MYPARAMETER")

and so on ...

#finally run las2txt

process = subprocess.Popen(command)

Cheers,

David

------ Originalnachricht ------

Von: "Colin Werle" <werle...@gmail.com>

An: "LAStools - efficient tools for LiDAR processing" <last...@googlegroups.com>

Gesendet: 04.05.2018 16:41:50

Betreff: [LAStools] Execute las2txt.exe in existing Python script

--
Download LAStools at
http://lastools.org
http://rapidlasso.com
Be social with LAStools at
http://facebook.com/LAStools
http://twitter.com/LAStools
http://linkedin.com/groups/LAStools-4408378
Manage your settings at
http://groups.google.com/group/lastools/subscribe

[Colin Werle]

David, 

Thank you for your informative response!

I've used a similar route to your response by running:

subprocess.call("%s -i %s -o %s -parse xyzRBGi -scale_rgb_down" %(las2txtTool,inputLas,outTxt), shell=True)

This route provided the proper output for me, but is there an advantage to using subprocess.Popen() instead?

I appreciate your help!

Colin

[David Friedrich]

Colin,

subprocess.call is basically:

Popen(*args, **kwargs).wait()

https://hg.python.org/cpython/file/e0df7db13d55/Lib/subprocess.py#l459

subprocess.popen is more versatile. it gives your more options to interact with the process you are going to start.

i think in your case it makes no difference, you just want to call las2txt and wait without the need to interact based on the output of las2txt.

David

------ Originalnachricht ------

Von: "Colin Werle" <werle...@gmail.com>

An: "LAStools - efficient tools for LiDAR processing" <last...@googlegroups.com>

Gesendet: 06.05.2018 16:41:04

Betreff: Re: [LAStools] Execute las2txt.exe in existing Python script