A latitude/longitude point defines a geographic location on or above/below the earth’s surface,
measured in degrees from the equator & the International Reference Meridian and in metres above
the ellipsoid, and based on a given datum.
As so much modern geodesy is based on WGS-84 (as used by GPS), this module includes WGS-84
ellipsoid parameters, and it has methods for converting geodetic (latitude/longitude) points to/from
geocentric cartesian points; the latlon-ellipsoidal-datum and latlon-ellipsoidal-referenceframe
modules provide transformation parameters for converting between historical datums and between
modern reference frames.
This module is used for both trigonometric geodesy (eg latlon-ellipsoidal-vincenty) and n-vector
geodesy (eg latlon-nvector-ellipsoidal), and also for UTM/MGRS mapping.
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