[pdal] Offset, rotate and convert a las dataset

[Andrew Bell]

Hi Rudy,

You should look at https://pdal.io/stages/filters.transformation.html. I
think you'd usually do a translation to the origin you desire, followed by
a rotation, followed by the inverse translation -- you can chain three
transformation filters to do this.

On Fri, Jul 30, 2021 at 2:00 AM Rudy Stricklan <
rudy.stricklan at mappingautomation.com> wrote:

> I realize this is probably a big ask, but any advice would be welcome. I
> have a .las dataset ('driveway.las') that was produced by a Livox
> solid-state LiDAR sensor <https://www.livoxtech.com/mid-40-and-mid-100>.
> The relevant portion of the lasinfo command:
>
> Header Summary
> ---------------------------------------------------------
>   Version:                     1.2
>   Number of Point Records:     2049000
>   Compressed:                  False
>   Number of Points by Return:  0 0 0 0 0
>   Scale Factor X Y Z:          0.00100000000000 0.00100000000000
> 0.00100000000000
>   Offset X Y Z:                0.000 0.000 0.000
>   Min X Y Z:                   0.000 -28410.000 -2096.000
>   Max X Y Z:                   114446.000 15231.000 30371.000
>   Spatial Reference:           None
>
> The Livox sensor was pointing west, so what I'd like to do is
> rotate/offset the las 90 degrees clockwise around a 0,0,0 point of
> -12472675,3936612,1402 (EPSG:3857), and finally assign the EPSG:3857
> coordinate reference system to the transformed las. Then as a final step, I
> want to convert the transformed las to an ept dataset.
>
> Ideally, I'd like to be provided with the PDAL pipeline json that would do
> all this. Understanding that this is a downright lazy request, perhaps
> someone could outline the pipeline steps that would perform my
> transformation/conversion for me to start from.
>
> Many thanks to any responders.
>
> Rudy Stricklan
> --
>
> Rudy Stricklan, ME, RPLS, GISP
> Mapping Automation, LLC
> 602.317.0130
> www.mappingautomation.com
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-- 
Andrew Bell
andrew.bell.ia at gmail.com
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