NAME

GIS::Distance::Haversine - Exact spherical distance calculations.

DESCRIPTION

This is the default distance calculation for GIS::Distance as it keeps a good balance between speed and accuracy.

A faster (XS) version of this formula is available as GIS::Distance::Fast::Haversine.

Normally this module is not used directly. Instead GIS::Distance is used which in turn interfaces with the various formula classes.

dlon = lon2 - lon1
dlat = lat2 - lat1
a = (sin(dlat/2))^2 + cos(lat1) * cos(lat2) * (sin(dlon/2))^2
c = 2 * atan2( sqrt(a), sqrt(1-a) )
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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