[Proj] The area of a rhumb line polygon

Charles Karney charles.karney at sri.com
Tue Dec 16 08:14:51 EST 2014

The calculation of the area of a geodesic polygon has been included in
GeographicLib since v1.4 (2010-09).

In the latest version v1.39, I've also included the equivalent
calculation when the edges of the polygon are rhumb lines.  The
formulation is given in


and the online planimeter


implements this area calculation.  I've also worked out the area when
the edges are great ellipses.  For the formulation, see


An implementation is included in the Matlab package


Comments are welcome.


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