

 
Manual Reference Pages  GIS::DISTANCE::FORMULA::GREATCIRCLE (3)
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NAME
GIS::Distance::Formula::GreatCircle  Great circle distance calculations. (BROKEN)
CONTENTS
DESCRIPTION
A true Great Circle Distance calculation. This was created
because the GIS::Distance::MathTrig calculation uses
Math::Trig’s great_circle_distance() which doesn’t actually
appear to use the actual Great Circle Distance formula.
Normally this module is not used directly. Instead GIS::Distance
is used which in turn interfaces with the various formula classes.
BROKEN
As documented in more detail at the BUGS section of GIS::Distance,
the distances returned by this module seem to be invalid. Don’t use
this module unless you want to help fix it.
FORMULA
c = 2 * asin( sqrt(
( sin(( lat1  lat2 )/2) )**2 +
cos( lat1 ) * cos( lat2 ) *
( sin(( lon1  lon2 )/2) )**2
) )
METHODS
distance
This method is called by GIS::Distance’s distance() method.
SEE ALSO
GIS::Distanc
AUTHOR
Aran Clary Deltac <bluefeet@cpan.org>
LICENSE
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
perl v5.20.3  GIS::DISTANCE::FORMULA::GREATCIRCLE (3)  20150611 
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