[pdal] Offset, rotate and convert a las dataset

[Rudy Stricklan]

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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