

 
Manual Reference Pages  GIS::DISTANCE::FORMULA::COSINE (3)
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NAME
GIS::Distance::Formula::Cosine  Cosine distance calculations.
CONTENTS
DESCRIPTION
Although this formula is mathematically exact, it is unreliable for
small distances because the inverse cosine is illconditioned.
Normally this module is not used directly. Instead GIS::Distance
is used which in turn interfaces with the various formula classes.
FORMULA
a = sin(lat1) * sin(lat2)
b = cos(lat1) * cos(lat2) * cos(lon2  lon1)
c = arccos(a + b)
d = R * c
METHODS
distance
This method is called by GIS::Distance’s distance() method.
SEE ALSO
GIS::Distanc
GIS::Distance::Formula::Cosine::Fast
AUTHOR
Aran Clary Deltac <bluefeet@cpan.org>
LICENSE
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)  20150611 
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