[PROJ] 3D version of geod.inv/geod.fwd?

[Charles Karney]

No.  There are two issues:

* The problem isn't fully defined.  It's not defined exactly what path
   is supposed to be followed from the source to the destination.

* The math for even is simplest generalization of the geodesic problem,
   namely geodesics on a surface of constant height above the ellipsoid,
   is complex.  (Mathar https://arxiv.org/abs/0711.0642 has got furthest
   on this.)

Alternatives are:

* Decompose the problem into a 2d one (geodesics on the ellipsoid) + 1d
   one (constant change in height along the 2d geodesic).

* Solve the problem in 3d Euclidean space.

Which approach is appropriate to your problem will depend on your
application.


On 6/28/21 10:21 AM, Idan Miara wrote:
> Hi,
> 
> Is there a 3D version of geod.inv/fwd?
> i.e
> 
> lon1,lat1,alt1,lon2,lat2,alt2 ->
> azi12,s12,elevation12
> 
> lon1,lat1,alt1,azi12,s12,elevation12 -> lon2,lat2,alt2
> 
> Kind regards,
> Idan
> 
> _______________________________________________
> PROJ mailing list
> PROJ at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/proj
>