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

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

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

•
<https://en.wikipedia.org/wiki/Spherical_law_of_cosines>

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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