Step function

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Jcb

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Sep 30, 2022, 2:27:07 AM9/30/22
to LAStools - efficient tools for LiDAR processing
I'm not sure I particularly understand the step function. I don't quite understand what it does, nor do I quite understand how to tell what I should set it at. 
  I especially don't seem to understand it in relation to las2dem -spike_free. Any insight most welcome. 


Jochen Rapidlasso

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Sep 30, 2022, 2:31:06 AM9/30/22
to LAStools - efficient tools for LiDAR processing
Hi Jacob,
see this article:
https://rapidlasso.com/2016/02/03/generating-spike-free-digital-surface-models-from-lidar/
Also a good solution is to do some own samples on a small tile with different arguments and argument parameters.
If you do not see the differences there please post this samples here (data + output) and we can have a look all together to your specific data.

Thanks and best regards,

Jochen @rapidlasso

Susana Gonzalez

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Oct 2, 2022, 6:01:56 PM10/2/22
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Hi Jochen,

 

Could you have a look at blast2dem? The spike_free is not working and the line of code still produce kml with the setting -no_kml

 

"C:\LASTools\bin\blast2dem.exe" -i D:\C2_wrk.laz -keep_class 2 -step 1 -spike_free 0.9 -epsg 32647 -nodata -9999 -o D:\C2_wrk_DTM_1m_tmp.tif -no_kml

ERROR: cannot understand argument '-spike_free'

 

Thanks

Susana

 

From: last...@googlegroups.com <last...@googlegroups.com> On Behalf Of Jochen Rapidlasso
Sent: Friday, 30 September 2022 7:31 PM
To: LAStools - efficient tools for LiDAR processing <last...@googlegroups.com>
Subject: [LAStools] Re: Step function

 

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Jcb

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Oct 2, 2022, 6:14:57 PM10/2/22
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Hi Susana, 
Blast2DEM does not support spike_free, you need to use las2dem for spike-free. 

Jochen Rapidlasso

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Oct 2, 2022, 7:06:10 PM10/2/22
to LAStools - efficient tools for LiDAR processing
Hi Susana,
the -no_kml argument seems not to work on blast2dem :-/
It works on las2dem.
I have to look at this.

Best regards,

Jochen @rapidlasso

Susana Gonzalez

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Oct 3, 2022, 4:18:09 AM10/3/22
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Hi Jochen,

 

If you could update the tool so we can use spike_free and no_kml would be much appreciated.

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