Martin Desruisseaux created SIS-386:
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Summary: Deprecate DefaultEllipsoid.orthodromicDistance(…) method
Key: SIS-386
URL: https://issues.apache.org/jira/browse/SIS-386
Project: Spatial Information Systems
Issue Type: Bug
Components: Referencing
Affects Versions: 0.8, 0.7, 0.6, 0.5, 0.4
Reporter: Martin Desruisseaux
Fix For: 1.0
The {{DefaultEllipsoid.orthodromicDistance}} method has the following problems:
* Could have a better name.
* It does not converge in some situations.
* The wraparound over some non-convergence problems is itself erroneous.
Charles Karney kindly listed the problems [on the developer mailing
list|https://lists.apache.org/thread.html/eee29fc53123e94b74c22737413b2572d3e4c9e4f111847fefb6a3af@%3Cdev.sis.apache.org%3E].
A possible action would be to deprecate {{orthodromicDistance}}, to be
replaced by the same {{GeodeticCalculator}} (or any other name) class than the
one proposed for SIS-385.
*Historical note:* {{orthodromicDistance}} was defined in the
{{DefaultEllipsoid}} class because it made easy to override the method with
code optimized for the spherical case. A future version could also override the
method with code for triaxial ellipsoid. But experience in the Geotk project
suggest that this method is almost never used, since {{GeodeticCalculator}} is
used instead.
As an alternative to deprecate {{DefaultEllipsoid.orthodromicDistance}}, we
could keep it (after renaming), fix the issues identified by Charles, and
design {{GeodeticCalculator}} as a class that use {{DefaultEllipsoid}} under
the hood instead than re-implementing its own algorithm.
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