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area enclosed by a poylgon on a sphere


I need to be able to find the area enclosed by an arbitrarily shaped
series of lat/lon points on the surface of the Earth. I have been told
that I can solve this using Green's Theorem, but before I gut through
the math I was hoping that someone would have solved this and be willing
to share the code.  If it is already in IDL that would be great, but any
language will do.


Ronn Kling
Ronn Kling Consulting

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