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

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

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<http://mathforum.org/library/drmath/view/51879.html> |
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<http://www.faqs.org/faqs/geography/infosystems-faq/> |

See " SUPPORT" in GIS::Distance.

See " AUTHORS" in GIS::Distance.

See " LICENSE" in GIS::Distance.