1GIS::Distance::GreatCirUcsleer(3Cpomn)tributed Perl DocuGmIeSn:t:aDtiisotnance::GreatCircle(3pm)
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NAME

6       GIS::Distance::GreatCircle - Great circle distance calculations.
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DESCRIPTION

9       A true Great Circle Distance calculation.  This was created because the
10       GIS::Distance::MathTrig formula uses Math::Trig's
11       "great_circle_distance()" which doesn't actually appear to use the
12       actual Great Circle Distance formula (more likely Cosine).
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14       A faster (XS) version of this formula is available as
15       GIS::Distance::Fast::GreatCircle.
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17       Normally this module is not used directly.  Instead GIS::Distance is
18       used which in turn interfaces with the various formula classes.
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FORMULA

21           c = 2 * asin( sqrt(
22               ( sin(( lat1 - lat2 )/2) )**2 +
23               cos( lat1 ) * cos( lat2 ) *
24               ( sin(( lon1 - lon2 )/2) )**2
25           ) )
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SUPPORT

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

31       See "AUTHORS" in GIS::Distance.
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LICENSE

34       See "LICENSE" in GIS::Distance.
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38perl v5.34.0                      2022-01-21   GIS::Distance::GreatCircle(3pm)
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