1GIS::Distance::MathTrigU(s3eprm)Contributed Perl DocumenGtIaSt:i:oDnistance::MathTrig(3pm)
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NAME

6       GIS::Distance::MathTrig - Great cirlce distance calculations using
7       Math::Trig.
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DESCRIPTION

10       This formula uses Math::Trig's "great_circle_distance()" which at this
11       time uses math almost exactly the same formula as the
12       GIS::Distance::Cosine formula.  And the Cosine formula is about 5%
13       faster than this formula.
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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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FORMULA

19           lat0 = 90 degrees - phi0
20           lat1 = 90 degrees - phi1
21           d = R * arccos(cos(lat0) * cos(lat1) * cos(lon1 - lon01) + sin(lat0) * sin(lat1))
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23       As stated in the Math::Trig documentation.
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SUPPORT

26       See "SUPPORT" in GIS::Distance.
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AUTHORS

29       See "AUTHORS" in GIS::Distance.
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32       See "COPYRIGHT AND LICENSE" in GIS::Distance.
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36perl v5.30.0                      2019-07-26      GIS::Distance::MathTrig(3pm)
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