webservice.GPSDistance.java Source code

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Here is the source code for webservice.GPSDistance.java

Source

/*
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package webservice;

import javax.faces.bean.SessionScoped;
import org.apache.commons.math3.ml.distance.DistanceMeasure;

/**
 *
 * @author Bart
 */
public class GPSDistance implements DistanceMeasure {
    @Override
    public double compute(double[] doubles, double[] doubles1) {
        double lat1 = doubles[0];
        double long1 = doubles[1];
        double lat2 = doubles1[0];
        double long2 = doubles1[1];
        return distFrom((float) lat1, (float) long1, (float) lat2, (float) long2);
    }

    public static double distFrom(double lat1, double lng1, double lat2, double lng2) {
        double earthRadius = 6371000; //meters
        double dLat = Math.toRadians(lat2 - lat1);
        double dLng = Math.toRadians(lng2 - lng1);
        double a = Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.cos(Math.toRadians(lat1))
                * Math.cos(Math.toRadians(lat2)) * Math.sin(dLng / 2) * Math.sin(dLng / 2);
        double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
        float dist = (float) (earthRadius * c);

        return dist;
    }
}