NAME

       GIS::Distance::Polar - Polar coordinate flat-earth distance calculations.

DESCRIPTION

       Supposedly this is a formula to better calculate distances at the poles.

       While implemented, this formula has not been tested much.  If you use it PLEASE share your
       results with the author.  I've tested the results of this formula versus
       GIS::Distance::Vincenty and it appears that this formula is broken (or the implementation
       is) as you can see in "t/polar.t".

       A faster (XS) version of this formula is available as GIS::Distance::Fast::Polar.

       Normally this module is not used directly.  Instead GIS::Distance is used which in turn
       interfaces with the various formula classes.

FORMULA

           a = pi/2 - lat1
           b = pi/2 - lat2
           c = sqrt( a^2 + b^2 - 2 * a * b * cos(lon2 - lon1) )
           d = R * c

SUPPORT

       See "SUPPORT" in GIS::Distance.

AUTHORS

       See "AUTHORS" in GIS::Distance.

LICENSE

       See "LICENSE" in GIS::Distance.