[rules-users] VCRP - Distance calculation in getMilliDistance

[muerlings]

Please, take a look at http://en.wikipedia.org/wiki/Great-circle_distance

In it, there are formulas based on latitude and longitude for arc length
calculation. The problem is that they are "expensive" formulas based on
trigonometric functions and could heavily impact performance, but they are a
better aproximation than the cord length.

mu





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