NAME

GIS::Distance::MathTrig - Great cirlce distance calculations using Math::Trig.

DESCRIPTION

This formula uses Math::Trig's great_circle_distance function which at this time uses math almost exactly the same as the GIS::Distance::Cosine formula. If you want to use the GIS::Distance::Cosine formula you may find that this module will calculate faster (untested assumption). For some reason this and the Cosine formula return slight differences at very close distances. This formula has the same drawbacks as the Cosine formula.

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

FORMULA

As stated in the Math::Trig POD:

lat0 = 90 degrees - phi0
lat1 = 90 degrees - phi1
d = R * arccos(cos(lat0) * cos(lat1) * cos(lon1 - lon01) + sin(lat0) * sin(lat1))

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