NAME

GIS::Distance::Polar - Polar coordinate flat-earth distance calculations. (BROKEN)

DESCRIPTION

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

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

BROKEN

While implimented, 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 Vincenty and it appears that this formula is broken (or the implementation is) as you can see in t/polar.t.

FORMULA

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

SEE ALSO

GIS::Distanc

AUTHORS AND LICENSE

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