Removing points based on height percentiles

[Shukhrat]

Hello,

I would like to remove points based on height percentile. Is it possible to drop points above 95 th percentile in lastools?

Thanks,

Kind regards,

Shukhrat

[Martin Isenburg]

Hello,

there is no direct method to do this and you would also be more specific with what areas you intend to compute those height percentiles in. Here is some way of achieving something like what you desire:

:: use lasthin to classify the point closest to the 95th elevation percentile

:: per 10 by 10 meter area as class 9

lasthin -i ..\data\fusa.laz -step 10 -percentile 95 -classify_as 9 -o fusa_p95.laz

:: view resulting 95 percentile TIN surface by pressing <w> and <t> and <a>

lasview -i fusa_p95.laz

:: use lasheight classify poby ints above the  95 percentile TIN surface as noise

lasheight -i fusa_p95.laz -class 9 -do_not_store_in_user_data -classify_above 0 7 -o fusa_p95_noise.laz

:: view resulting 95 percentile noise by pressing <n> and <a>

  
lasview -i fusa_p95_noise.laz

Attached are a number of image illustrating the above. You should use tiles *WITH* buffers to do this correctly across a tiled point cloud.

https://rapidlasso.com/2015/08/07/use-buffers-when-processing-lidar-in-tiles/ 

Regards from Panama,

Martin

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