# GIS::Distance::Constants

## NAME

GIS::Distance::Constants - Constants used by formula classes.

## CONSTANTS

**$KILOMETER_RHO**

Number of kilometers around the equator of the earth.

6371.64

**$DEG_RATIO**

Number of units in a single decimal degree (lat or lon) at the equator.

0.0174532925199433

This value is derived from:

$gis = GIS::Distance->new( 'Haversine' );

$DEG_RATIO = $gis->distance( 10,0 => 11,0 )->km() / $KILOMETER_RHO;

## SUPPORT

See " SUPPORT" in GIS::Distance.

## AUTHORS

See " AUTHORS" in GIS::Distance.

## LICENSE

See " LICENSE" in GIS::Distance.