haversine() is broken / misdocumented
-------------------------------------
Key: LUCENE-3599
URL: https://issues.apache.org/jira/browse/LUCENE-3599
Project: Lucene - Java
Issue Type: Bug
Components: modules/spatial
Affects Versions: 3.5
Reporter: David Smiley
DistanceUtils.haversine() is coded in a way that is erroneous based on the
documented order of the parameters. The parameters are defined as
(x1,y1,x2,y2,radius) -- i.e. lon,lat order. The code implementing the
algorithm, however, is as if the meaning of x and y are transposed, which means
that if you supply the arguments in lat,lon (y,x) order, you will get the
correct behavior. It turns out that all callers of this method do this!
FYI I found out about this bug since it is inherited code in LSP
(lucene-spatial-playground) and I have been supplying parameters according to
its documented order. Apparently I shouldn't do that ;-)
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