topic Re: LAS in Geoprocessing Questions

LAS

tinigjeo — Fri, 02 Feb 2018 11:47:09 GMT

HI i have point xyz and can make LAS dataset?

Re: LAS

XanderBakker — Fri, 02 Feb 2018 12:00:01 GMT

I have done this in the past using LAStools (LAStools: converting, filtering, viewing, processing, and compressing LIDAR data in LAS format ). See a description here:https://community.esri.com/thread/34075#comment-210089

According to the discussion in the idea: Ability to convert xyz point data to LAS format It should be part of the Data Interop extension.

Re: LAS

tinigjeo — Fri, 02 Feb 2018 13:30:44 GMT

have you any example video ?

Re: LAS

XanderBakker — Fri, 02 Feb 2018 13:41:28 GMT

I don't have any video explaining the steps, but if you can share the, let's say' first 100 records of the XYZ file, I can see if I can provide some more explanation on the steps to accomplish this.

Re: LAS

tinigjeo — Fri, 02 Feb 2018 14:08:31 GMT

ATTACH FILE DOC

Re: LAS

XanderBakker — Fri, 02 Feb 2018 14:42:20 GMT

I notice that you have 2 elevation values. Which one do you want to use in the output LAS file?

Is your decimal sign really a comma? This might need to be changed to point before processing the file, but I will confirm this.

Re: LAS

tinigjeo — Fri, 02 Feb 2018 14:53:35 GMT

IF IT ISNT PROBLEM USE ORTHOMTRIC ELEVATION

Re: LAS

XanderBakker — Sat, 11 Dec 2021 18:22:49 GMT

No problem.

So, you first go the website I mentioned before:

LAStools: converting, filtering, viewing, processing, and compressing LIDAR data in LAS format

You can scroll down to the tool txt2las.exe and click it (or any other tool, since it will download a ZIP with all the tools):

Or use this direct link:

http://lastools.org/download/LAStools.zip

When you open the ZIP, you will notice that there is a large amount of information in it: In the LASTOOLS folder you will see a LICENSE.TXT file and you can verify that the txt2las is free:

This part of LAStools is "free" open-source LGPL (see COPYING.txt). To
purchase a different licensing model contact 'license@rapidlasso.com'.

    * laszip
    * lasindex
    * lasvalidate
    * lasliberate
    * lasinfo
    * las2las
    * lasdiff
    * lasmerge
    * las2txt & txt2las
    * lasprecision
    * LASzip (with static linking exception)
    * LASlib (with LASzip) - the API used by LAStools.‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

What you will also see, is that Martin Isenburg has included a toolbox that allows you to process the data directly in ArcGIS.

If you unzip the files to a local folder, you can navigate to the folder and find the LAStools.tbx. Inside you will find the tool txt2las. Double click to open the tool:

Before you load the tool, you will need to change the decimal sign into a dot, since the comma will be interpreted as a field separator and mess up the result. So, if you can, open the text file and change the decimal sign from coma to a dot:

When we look at order of the fields we will see, this order:

Y X skip Z

This is something that we will need to specify in the tool in order to interpret the data correctly:

So open the tool (if you haven't already) and specify the following:

select the corrected text file
use "yxsz" as parse string, this will read Y, X, skip the third attribute, Z
skip 1 line (header)
Choose the LAS version
Select output format (las)
Specify the output file

When you run the tool it will generate the LAS file and it will be loaded to ArcMap (at least in 10.6 it will):

When we identify a LAS point and compare it with the input data it corresponds:

Re: LAS

tinigjeo — Fri, 02 Feb 2018 21:03:59 GMT

I HAVE ARCGIS 10.4.1 IS PROBLEM THIS ?

Re: LAS

XanderBakker — Fri, 02 Feb 2018 22:00:10 GMT

It shouldn't be a problem, since the website mentions: All of the tools can also be run via a native GUI and are available as a LiDAR processing toolboxes for ArcGIS versions 9.3 and up

Did you try and did you get any error?

Re: LAS

tinigjeo — Sat, 03 Feb 2018 22:36:11 GMT

Yes I try but did work ....this file is free or ought pay for work

Sent from my Samsung Galaxy smartphone.

Re: LAS

XanderBakker — Sat, 03 Feb 2018 23:07:38 GMT

Not entirely sure what you mean. Were you able to successfully run the tool and convert your text file into a las file? In case you haven't please share any error message you obtained in the process.

As I mentioned before the txt2las functionality is part of the "free" open-source LGPL part of the software. In case you have any doubt please contact the owner of the software using this email: license@rapidlasso.com.

Re: LAS

tinigjeo — Sat, 03 Feb 2018 23:21:47 GMT

I think when convert txt file on Las..

Sent from my Samsung Galaxy smartphone.

Re: LAS

tinigjeo — Mon, 05 Feb 2018 20:44:44 GMT

I will try to make your example with other point but doesnt work for more now i will send my work

please attach folden to understand what i have done

Re: LAS

XanderBakker — Tue, 06 Feb 2018 13:33:15 GMT

Judging from the screenshot you provided, you are able to successfully run the tool and create the LAS file. Do you have any other question?

Re: LAS

tinigjeo — Tue, 06 Feb 2018 13:48:57 GMT

Yes look ok but when I do add the folder it's empty so what can I do for more...

Sent from my Samsung Galaxy smartphone.

Re: LAS

XanderBakker — Tue, 06 Feb 2018 13:53:54 GMT

OK, so you run the tool. It ends "successfully", but does not create any output file (so it does not work). To understand what is happening, I would have to get access to the file you are using and see a screenshot of the settings you use in the tool. Start with sharing a screenshot of the tool configuration. By that I mean this screen:

Re: LAS

XanderBakker — Thu, 08 Feb 2018 12:12:48 GMT

Hi tini gjeo , can you share the screenshot as requested? And is it possible to share the data itself?

Re: LAS

tinigjeo — Thu, 08 Feb 2018 12:42:29 GMT

Ok it possible talk on private email

Sent from my Samsung Galaxy smartphone.

Re: LAS

tinigjeo — Thu, 08 Feb 2018 12:44:53 GMT

Give me your address for more...

Sent from my Samsung Galaxy smartphone.