[PROJ] How to use PROJ for vectors and rotations?

[Nigel Stewart]

Hello all,

First of all my thanks for the comments about WGS84 and why we should think
differently about that in the context of survey-grade data processing using
RTK.

There is another aspect of PROJ and reprojection that we're looking at.
PROJ is formulated in terms of points and our LiDAR offerings are very much
concerned with gathering large quantities of those.
Sometimes these points have an associated surface normal attribute, a unit
vector.
And sometimes we have points with an associated quaternion rotation: (or
yaw, pitch, roll)

Is there known math and/or code for applying PROJ to these domains as well?
For Helmert transformation it seems reasonable to use the rotation matrix
directly.
(Ignoring translation and scale)  But more generally?

- Nigel

-- 
*Dr. Nigel Stewart (PhD)*
*Senior Software Engineer*
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