1GIS::Distance::Cosine(3Upsme)r Contributed Perl DocumentaGtIiSo:n:Distance::Cosine(3pm)
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6 GIS::Distance::Cosine - Spherical law of cosines distance calculations.
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9 Although this formula is mathematically exact, it is unreliable for
10 small distances. See GIS::Distance::MathTrig for related details.
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12 A faster (XS) version of this formula is available as
13 GIS::Distance::Fast::Cosine.
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15 Normally this module is not used directly. Instead GIS::Distance is
16 used which in turn interfaces with the various formula classes.
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19 a = sin(lat1) * sin(lat2)
20 b = cos(lat1) * cos(lat2) * cos(lon2 - lon1)
21 c = arccos(a + b)
22 d = R * c
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25 • <https://en.wikipedia.org/wiki/Spherical_law_of_cosines>
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28 See "SUPPORT" in GIS::Distance.
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31 See "AUTHORS" in GIS::Distance.
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34 See "LICENSE" in GIS::Distance.
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38perl v5.32.1 2021-02-01 GIS::Distance::Cosine(3pm)