GIS::Distance::Cosine - Spherical law of cosines distance calculations.
Although this formula is mathematically exact, it is unreliable for small distances. See GIS::Distance::MathTrig for related details.
A faster (XS) version of this formula is available as GIS::Distance::Fast::Cosine.
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
https://en.wikipedia.org/wiki/Spherical_law_of_cosines
See "SUPPORT" in GIS::Distance.
See "AUTHORS" in GIS::Distance.
See "LICENSE" in GIS::Distance.
To install GIS::Distance, copy and paste the appropriate command in to your terminal.
cpanm
cpanm GIS::Distance
CPAN shell
perl -MCPAN -e shell install GIS::Distance
For more information on module installation, please visit the detailed CPAN module installation guide.