A latitude/longitude point defines a geographic location on or relative to the earth’s surface,
measured in degrees from the equator and the Greenwich meridian and metres above the ellipsoid,
and based on a given datum. The datum defines the reference ellipsoid, and the transformation
parameters between different datums.
The module includes ellipsoid parameters and datums for different coordinate systems, and methods
for converting between them and to/from cartesian coordinates.
q.v. Ordnance Survey ‘A guide to coordinate systems in Great Britain’ Section 6
www.ordnancesurvey.co.uk/docs/support/guide-coordinate-systems-great-britain.pdf.
This module is used for both trigonometric methods (eg latlon-vincenty) and n-vector methods (eg
latlon-nvector-ellipsoidal).
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