GIS::Distance::MathTrig3pm

Great cirlce distance calculations using math::trig.

Overview

This formula uses Math::Trig's "great_circle_distance()" which at this time uses math almost exactly the same formula as the GIS::Distance::Cosine formula. And the Cosine formula is about 5% faster than this formula.

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

Formula

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

As stated in the Math::Trig documentation.

Support

See "SUPPORT" in GIS::Distance.

Releases

2 releases since Debian 12 (Bookworm); the text changed 1 time.