GIS::Distance::Formula::Haversine - Exact spherical distance calculations.
This is the default distance calculation for GIS::Distance as it keeps a good balance between speed and accuracy.
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
This method is called by GIS::Distance's 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.