Geometry Boost List: [geometry] transformation from ECEF x,y,z to LatLongAlt (LLA)

From: John Mairs (john.d.mairs_at_[hidden])
Date: 2021-07-06 20:39:12

I've found some online calculators that compute (in 3 dimensions)  ECEF
x,y,z to LLA and back.
https://www.oc.nps.edu/oc2902w/coord/llhxyz.htm

And I would like to do the same thing using boost geometry.

I watched Adam's 2019 Fos4G in Bucharest and I think I saw that only 2D is
supported.

I'm new to GIS so all of the vocabulary terms are quite overwhelming.

I have seen the example (transform_2) in the docs of going from degree
(lon-lat) to 3d on the unit circle.  Even with that example i don't
understand how (theta 5.0 and phi = 15.0) map to lat/long.

Thanks for your patience and help.

John