NAME

GIS::Distance::Formula::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 classes.

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 02_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

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.