Re: [Boost-bugs] [Boost C++ Libraries] #11917: geometry default geographic (andoyer) antipodal distance is zero

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #11917: geometry default geographic (andoyer) antipodal distance is zero
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-01-17 19:20:16

#11917: geometry default geographic (andoyer) antipodal distance is zero
----------------------------------------+----------------------------------
  Reporter:  Ken Barker <ken.barker@…>  |      Owner:  barendgehrels
      Type:  Bugs                       |     Status:  new
 Milestone:  To Be Determined           |  Component:  geometry
   Version:  Boost 1.61.0               |   Severity:  Problem
Resolution:                             |   Keywords:  wgs84 distance
                                        |  andoyer
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Comment (by Ken Barker <ken.barker@…>):

 I agree with Charles Karney's comment above.

 I originally raised this issue after finding an issue with the `Vincenty`
 function, see: http://stackoverflow.com/questions/34767736/why-is-

 boostgeometry-geographic-vincenty-distance-inaccurate-around-the-equato

 On further investigation (and with a bit of help from Charles) I came to
 realise that both the `Vincenty` and `Andoyer` algorithms calculate
 incorrect distances for antipodal points on the equator. Whilst
 [GeographicLib](http://geographiclib.sourceforge.net/) calculates the
 correct distance.

 It should be included in boost geometry and replace `Andoyer` as the
 default algorithm.

 BTW, please note that Charles's link to `GeographicLib` is incorrect,
 please use the one in this comment.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/11917#comment:2>
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