Transform 3D data to lat lon.

[raphaeljolivet]

Hi, thanks for this work.
This is very useful.

If you happen to need to project back the 3D x,y,z coordinates to geographic (lat,lon) coordinates, be aware that Google seems to model the earth as a perfect sphere (rather than an ellipsoid).

Hence, you can get lat, lon from basic trigonometry (here in Python) :

lon = atan2(y, x) * 180 / pi
lat = atan2(z, sqrt(x*x + y*y)) * 180 / pi
height = sqrt(x * x + y * y + z * z)

Those coordinates are then compliant with WGS84 / EPSG:4326