Computes the distance in kilometers between two points on Earth. - Java java.lang

Java examples for java.lang:Math Geometry Distance

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Description

Computes the distance in kilometers between two points on Earth.

Demo Code



public class Main{
    private static int EARTH_RADIUS_KM = 6371;
    public static int MILLION = 1000000;
    /**/*  w  w w .jav  a2s. c  o  m*/
     * Computes the distance in kilometers between two points on Earth.
     * 
     * @param lat1 Latitude of the first point
     * @param lon1 Longitude of the first point
     * @param lat2 Latitude of the second point
     * @param lon2 Longitude of the second point
     * @return Distance between the two points in kilometers.
     */
    public static double distanceKm(double lat1, double lon1, double lat2,
            double lon2) {
        double lat1Rad = Math.toRadians(lat1);
        double lat2Rad = Math.toRadians(lat2);
        double deltaLonRad = Math.toRadians(lon2 - lon1);

        return Math.acos(Math.sin(lat1Rad) * Math.sin(lat2Rad)
                + Math.cos(lat1Rad) * Math.cos(lat2Rad)
                * Math.cos(deltaLonRad))
                * EARTH_RADIUS_KM;
    }
    /**
     * Computes the distance in kilometers between two points on Earth.
     * 
     * @param p1 First point
     * @param p2 Second point
     * @return Distance between the two points in kilometers.
     */
    public static double distanceKm(GeoPointDouble p1, GeoPointDouble p2) {
        double lat1 = p1.getLatitudeE6() / (double) MILLION;
        double lon1 = p1.getLongitudeE6() / (double) MILLION;
        double lat2 = p2.getLatitudeE6() / (double) MILLION;
        double lon2 = p2.getLongitudeE6() / (double) MILLION;

        return distanceKm(lat1, lon1, lat2, lon2);
    }
}

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