Modern geodetic reference frames: a latitude/longitude point defines a geographic location on or
above/below the earth’s surface, measured in degrees from the equator and the International
Reference Meridian and metres above the ellipsoid within a given terrestrial reference frame at a
given epoch.
This module extends the core latlon-ellipsoidal module to include methods for converting between
different reference frames.
This is scratching the surface of complexities involved in high precision geodesy, but may be of
interest and/or value to those with less demanding requirements.
Note that ITRF solutions do not directly use an ellipsoid, but are specified by cartesian
coordinates; the GRS80 ellipsoid is recommended for transformations to geographical coordinates
(itrf.ensg.ign.fr).