get Latitude/Longitude by providing distance, bearing angle and reference Latitude/Longitude - Java java.lang

Java examples for java.lang:Math Geometry Distance

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Description

get Latitude/Longitude by providing distance, bearing angle and reference Latitude/Longitude

Demo Code


//package com.java2s;

public class Main {
    /**//from w ww . ja  v  a2 s .c om
     * get Lat/Lon by providing distance, bearing angle and reference lat/lon
     * @param distanceInKM - distance from ref location in KM.
     * @param bearingAngleInRadians - angular direction from north direction.
     * @param refLatitude - reference latitude.
     * @param refLongitude - reference longitude.
     * @return latitude longitude in double array.
     */
    public static double[] findGeoCoordinates(double distanceInMeters,
            double azimuthAngleInDegrees, double refLatitude,
            double refLongitude) {
        double lat1 = Math.toRadians(refLatitude); // Current lat point
        // converted to radians
        double lon1 = Math.toRadians(refLongitude); // Current long point
        // converted to radians
        double radius = getEarthRadiusForLatitude(lat1); // #Radius of the Earth

        azimuthAngleInDegrees = Math.toRadians(azimuthAngleInDegrees);

        double lat2 = Math.asin(Math.sin(lat1)
                * Math.cos(distanceInMeters / radius) + Math.cos(lat1)
                * Math.sin(distanceInMeters / radius)
                * Math.cos(azimuthAngleInDegrees));

        double lon2 = lon1
                + Math.atan2(
                        Math.sin(azimuthAngleInDegrees)
                                * Math.sin(distanceInMeters / radius)
                                * Math.cos(lat1),
                        Math.cos(distanceInMeters / radius)
                                - Math.sin(lat1) * Math.sin(lat2));

        return new double[] { Math.toDegrees(lat2), Math.toDegrees(lon2) };
    }

    private static double getEarthRadiusForLatitude(double latitude) {
        double equatorRadius = 6378.137; // equatorial radius in km
        double polarRadius = 6356.7523142; // polar radius in km
        return equatorRadius
                * Math.sqrt(Math.pow(polarRadius, 4)
                        / Math.pow(equatorRadius, 4)
                        * Math.pow((Math.sin(latitude)), 2)
                        + Math.pow(Math.cos(latitude), 2))
                / Math.sqrt(1
                        - (1 - (polarRadius * polarRadius)
                                / (equatorRadius * equatorRadius))
                        * Math.pow(Math.sin(latitude), 2));
    }
}

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