Manual Reference Pages - GIS::DISTANCE::FORMULA::COSINE (3)
GIS::Distance::Formula::Cosine - Cosine distance calculations.
Although this formula is mathematically exact, it is unreliable for
small distances because the inverse cosine is ill-conditioned.
Normally this module is not used directly. Instead GIS::Distance
is used which in turn interfaces with the various formula classes.
a = sin(lat1) * sin(lat2)
b = cos(lat1) * cos(lat2) * cos(lon2 - lon1)
c = arccos(a + b)
d = R * c
This method is called by GIS::Distances distance() method.
Aran Clary Deltac <email@example.com>
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
|perl v5.20.3 ||GIS::DISTANCE::FORMULA::COSINE (3) ||2015-06-11 |
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