[postgis-tickets] [PostGIS] #2913: ST_Azimuth and ST_Distance on geography antipodes or near-antipodes

[PostGIS]

#2913: ST_Azimuth and ST_Distance on geography antipodes or near-antipodes
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 Reporter:  mwtoews  |       Owner:  pramsey
     Type:  defect   |      Status:  new    
 Priority:  medium   |   Milestone:         
Component:  postgis  |     Version:  2.1.x  
 Keywords:           |  
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Comment(by mwtoews):

 The geographic functions in GeographicLib are published here:

 > C. F. F. Karney, Algorithms for geodesics, J. Geodesy 87(1), 43–55 (Jan.
 2013); DOI:[http://dx.doi.org/10.1007/s00190-012-0578-z
 10.1007/s00190-012-0578-z]

 With addenda [http://geographiclib.sourceforge.net/geod-addenda.html
 here].

 The license is MIT/X11, so some of the relevant algorithms can be brought
 over to lwspheroid.c with attribution to Charles Karney.

 Further note that the current implementation of algorithms is based on
 [http://www.icsm.gov.au/gda/gdav2.3.pdf Geocentric Datum of Australia
 Technical Manual], with
 [http://www.ga.gov.au/nmd/geodesy/datums/vincenty_inverse.jsp a web app
 calculator]. However, the web app also has the correct answers the this
 bug report, so I'm not sure which one is best, except to say that the
 PostGIS implementation is definitely incorrect.

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/2913#comment:3>
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