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 modules.

FORMULA

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

AUTHORS AND LICENSE

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

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NAME

DESCRIPTION

FORMULA

AUTHORS AND LICENSE

Module Install Instructions