TLS Data Regarding

[Pm Preethi]

Greetings to all,

     I am using Lastools for creating DEM and DSM  from terrestrial LIDAR data. The scans are taken in an undulated area and while using lassplit tool for splitting the ground and non-ground points, some of the ground points are classified as non-ground points and are getting added to the non-ground points. My question is :Which is the best option in LasTools  suitable for separating the ground and non-ground points from terrestrial lidar data in my case.

 

      And is there any option in Lastools like nonairborne.exe for processing TLS data.

Thanks and Regards,

Preethi.P.M

[Martin Isenburg]

Hello Preethi,

I assume you that - in order to ground classify - you are using the lassplit tool to split the TLS LiDAR points into vertical bins. This will lead to poor results unless the ground lines up perfectly with a slice along the z axis (e.g. perfectly flat and zero slope). The correct tool to use would be lasground.

http://rapidlasso.com/lasground

http://lastools.org/download/lasground_README.txt

Play around with some of the options and - should your data be very dense - operate on only a lasthinned subset of the points.

http://rapidlasso.com/lasthin

http://lastools.org/download/lasthin_README.txt

Some of the recent tutorials on the LAStools blog to read through and adapt your workflow from are these one here:

https://rapidlasso.com/2017/01/16/pre-processing-mobile-rail-lidar-with-lastools/

https://rapidlasso.com/2017/10/29/processing-drone-lidar-from-yellowscans-surveyor-a-velodyne-puck-based-system/

Regards from Costa Rica,

Martin

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