GIS::Distance::Polar 0.01001

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

SYNOPSIS

my $calc = GIS::Distance::Polar->new();
my $distance = $calc->distance( $lon1, $lat1 => $lon2, $lat2 );

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

While implimented, this formula has not been tested much. If you use it PLEASE share your results with the author.

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

my $distance = $calc->distance( $lon1, $lat1 => $lon2, $lat2 );

This method accepts two lat/lon sets (in decimal degrees) and returns a Class::Measure::Length object containing the distance between the two points.