[Octave-patch-tracker] [patch #9958] [octave forge](mapping) gcxgc

[Philip Nienhuis]

Follow-up Comment #12, patch #9958 (project octave):

Yeah you're absolutely right. What gcxgc and related functions need to
accomplish looks easy at first sight but soon turns out to be very
complicated, esp. getting sufficiently accurate answers.

As to preliminaries for great circle poles I found this site:
https://www.aa.quae.nl/en/reken/grootcirkel.html
where some apparently useful info is given.
It seems that many great circle problems for decades have been extensively
investigated in aviation, but many of that literature is of the "gray" variety
and hard to uncover.

I'm of little help here ATM, I simply lack time now although I find it a
fascinating subject and very useful for the mapping package.

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