# GIS::Distance::ALT

## NAME

GIS::Distance::ALT - Andoyer-Lambert-Thomas distance calculations.

## DESCRIPTION

The ALT formula is intended as a much faster, but slightly less accurate, alternative of the GIS::Distance::Vincenty formula. This formulas is about 5x faster than Vincenty.

The code for this formula was taken from Geo::Distance::XS and modified to fit.

A faster ( XS ) version of this formula is available as GIS::Distance::Fast::ALT.

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

## SUPPORT

See " SUPPORT" in GIS::Distance.

## AUTHORS

See " AUTHORS" in GIS::Distance.

## LICENSE

See " LICENSE" in GIS::Distance.