[Therion] 3D model height

[Balambér Hakapesz]

Hi!

When generating 3D models, Proj4 transforms between different coordinate
systems.
This also transforms the ellipsoidal altitude, but the data always refer to
altitude above sea level and should not be changed.
The finished models do not fit the topography, you have to cheat with the
height to be good.

Balázs Holl.

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