GIS::Distance::GreatCircle - Great circle distance calculations.
A true Great Circle Distance calculation. This was created because the GIS::Distance::MathTrig formula uses Math::Trig's great_circle_distance() which doesn't actually appear to use the actual Great Circle Distance formula (more likely Cosine).
great_circle_distance()
A faster (XS) version of this formula is available as GIS::Distance::Fast::GreatCircle.
Normally this module is not used directly. Instead GIS::Distance is used which in turn interfaces with the various formula classes.
c = 2 * asin( sqrt( ( sin(( lat1 - lat2 )/2) )**2 + cos( lat1 ) * cos( lat2 ) * ( sin(( lon1 - lon2 )/2) )**2 ) )
See "SUPPORT" in GIS::Distance.
See "AUTHORS" in GIS::Distance.
See "LICENSE" in GIS::Distance.
To install GIS::Distance, copy and paste the appropriate command in to your terminal.
cpanm
cpanm GIS::Distance
CPAN shell
perl -MCPAN -e shell install GIS::Distance
For more information on module installation, please visit the detailed CPAN module installation guide.