org.geonames.utils

Class Distance

java.lang.Object

org.geonames.utils.Distance

public class Distance
extends java.lang.Object

Distance calculations.

Author:

marc@geonames

Field Summary

Fields

Modifier and Type	Field and Description
static double	EARTH_RADIUS_KM mean radius = 6372.0 The Earth's equatorial radius = 6335.437 km.
static double	EARTH_RADIUS_MILES statute miles

Constructor Summary

Constructors

Constructor and Description
Distance()

Method Summary

Modifier and Type	Method and Description
static double	distance(double lat1, double lng1, double lat2, double lng2, char unit, int numberOfDigits) http://mathworld.wolfram.com/GreatCircle.html and http://www.mathforum.com/library/drmath/view/51711.html
static double	distanceKM(double lat1, double lng1, double lat2, double lng2)
static double	distanceMiles(double lat1, double lng1, double lat2, double lng2)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

EARTH_RADIUS_KM

public static final double EARTH_RADIUS_KM

mean radius = 6372.0 The Earth's equatorial radius = 6335.437 km. The Earth's polar radius = 6399.592 km.

See Also:

Constant Field Values

EARTH_RADIUS_MILES

public static final double EARTH_RADIUS_MILES

statute miles

See Also:

Constant Field Values

Constructor Detail

Distance

public Distance()

Method Detail

distance

public static double distance(double lat1,
                              double lng1,
                              double lat2,
                              double lng2,
                              char unit,
                              int numberOfDigits)

http://mathworld.wolfram.com/GreatCircle.html and http://www.mathforum.com/library/drmath/view/51711.html

Returns:

distanceKM

public static double distanceKM(double lat1,
                                double lng1,
                                double lat2,
                                double lng2)

distanceMiles

public static double distanceMiles(double lat1,
                                   double lng1,
                                   double lat2,
                                   double lng2)