NAME

GIS::Distance::Cosine - Spherical law of cosines distance calculations.

DESCRIPTION

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

To install GIS::Distance, copy and paste the appropriate command in to your terminal.

cpanm GIS::Distance

perl -MCPAN -e shell
install GIS::Distance

For more information on module installation, please visit the detailed CPAN module installation guide.

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