las2las rejecting variable substitution for arguments

[Corey Newton]

Hello,

 

I have encountered a problem with las2las where it refuses to acknowledge the source CRS as a valid argument:

 

1. PS D:\20240316-1-3065> $CRS_source = "-epsg 4978"
2. PS D:\20240316-1-3065> & C:\lastools\bin\las2las64.exe -cores 128 -i .\06_RIEGL_PROC\04_EXPORT\*.las $CRS_source -keep_every_nth 10 -keep_last_of_many -translate_gps_time -18 -target_epsg 4326 -odir .\_QC\LAZ_UTC_DAY_SECONDS -olaz
3. ERROR: cannot understand argument '-epsg 4978'. use '-h' or see las2las_README.md to get help.

 

I assumed that ‘-epsg 4978’ and ‘-utm 10n’ would be parsed as a string (and it shows up in the terminal as such) but it is seemingly unknown to las2las. It will work fine if I manually type them out but this is part of a larger set of automations.

 

What do you recommend to get around this?

 

Thanks,

 

Corey Newton, Acquisition Manager

Kîsik Aerial Survey
4340 King St. – Unit 3

Delta, BC. V4K 0A5
T: (604) 821-9915 ext. 0005 | www.kisik.ca

KÎSIK is a Cree word for Sky

 

[Jochen Rapidlasso]

Hi Corey,

this is more a PS than a LAStools issue.

LAStools uses the argument feature of the operating system you are on.
Microsoft likes to think for their users, most they do wrong. So if you have a variable like "-epsg 4978" they think you want to have this as one argument, and pass this to the program like that.

You have to do this in 2 variables:

$first = "-epsg"
$second = "4978"
las2las64 -i foo.laz $first $second ...

and it will work.

Cheers,

Jochen @rapidlasso

[Corey Newton]

Ah – I assumed it would work like it does in Linux.

Thanks for the quick response, much appreciated.

 

Corey

 

From: last...@googlegroups.com <last...@googlegroups.com> On Behalf Of Jochen Rapidlasso
Sent: Thursday, January 16, 2025 01:29
To: LAStools - efficient tools for LiDAR processing <last...@googlegroups.com>
Subject: [LAStools] Re: las2las rejecting variable substitution for arguments

 

Hi Corey,

this is more a PS than a LAStools issue.

LAStools uses the argument feature of the operating system you are on.
Microsoft likes to think for their users, most they do wrong. So if you have a variable like "-epsg 4978" they think you want to have this as one argument, and pass this to the program like that.

You have to do this in 2 variables:

 

$first = "-epsg"
$second = "4978"
las2las64 -i foo.laz $first $second ...

 

and it will work.

Cheers,

 

Jochen @rapidlasso

On Thursday, January 16, 2025 at 8:17:52 AM UTC+1 Corey Newton wrote:

Hello,

 

I have encountered a problem with las2las where it refuses to acknowledge the source CRS as a valid argument:

 

1. PS D:\20240316-1-3065> $CRS_source = "-epsg 4978"
2. PS D:\20240316-1-3065> & C:\lastools\bin\las2las64.exe -cores 128 -i .\06_RIEGL_PROC\04_EXPORT\*.las $CRS_source -keep_every_nth 10 -keep_last_of_many -translate_gps_time -18 -target_epsg 4326 -odir .\_QC\LAZ_UTC_DAY_SECONDS -olaz
3. ERROR: cannot understand argument '-epsg 4978'. use '-h' or see las2las_README.md to get help.

 

I assumed that ‘-epsg 4978’ and ‘-utm 10n’ would be parsed as a string (and it shows up in the terminal as such) but it is seemingly unknown to las2las. It will work fine if I manually type them out but this is part of a larger set of automations.

 

What do you recommend to get around this?

 

Thanks,

 

Corey Newton, Acquisition Manager

Kîsik Aerial Survey
4340 King St. – Unit 3

Delta, BC. V4K 0A5
T: (604) 821-9915 ext. 0005 | www.kisik.ca

KÎSIK is a Cree word for Sky

 

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