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GIS::Distance::Haversine(3) User Contributed Perl Documentation GIS::Distance::Haversine(3)

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

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

See "SUPPORT" in GIS::Distance.

See "AUTHORS" in GIS::Distance.

See "LICENSE" in GIS::Distance.
2021-01-30 perl v5.32.1
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