Subcircle option

[Monika Papartė]

Hello,

I was wondering if there’s a way to create a CHM using only P95 points with a subcircle . I know this functionality is currently available in lasgrid, but as far as I know, you can only use the highest, lowest, etc. points, but not P95.

Would it be possible to enable the use of P95 values in lasgrid? Or is there another workaround to achieve this?

Thanks in advance for any suggestions!

Monika

[rapid...@gmail.com]

Hi Monika,

probably right now the only way is to give the P95 value as a absolute value.

So if lasinfo64 -i ... gives you "23.4" as maximum z you can calculate 23.4*0.95 = 22.23 and run

    lasgrid64 -i ... -keep_above_z 22.23 -subcircle ...

Using lasinfo64 with json output (-json) and some lines of python this could be automated.

If you want to have an argument handling like we implemented this with the color functions using a "P" suffix at the numbers we probably could do this as well.

This whould look like

    lasgrid64 -i ... -keep_above_z 95p -subcircle ...

or

    lasgrid64 -i ... -keep_above_z 95% -subcircle ...

Would this help?

Cheers,

Jochen @rapidlasso

[Monika Papartė]

Hello Jochen,

Sorry for the very late reply. Other projects took priority and I only recently returned to this workflow where the issue appeared again. 

Yes, this suggestion would definitely help. Having an option such as -keep_above_z 95p or 95% would make the process much easier to automate compared to calculating the absolute value beforehand.

Thanks,

Monika