how to get distance between two places in kilometer in google map v2 using LatLng

Question

In my android application, I've to calculate distance between user's current location and the point that user taps on the map. I'm using this function to calculate:

     public double CalculationByDistance(LatLng StartP, LatLng EndP) {
     int Radius=6371;//radius of earth in Km         
     double lat1 = StartP.latitude;
     double lat2 = EndP.latitude;
     double lon1 = StartP.longitude;
     double lon2 = EndP.longitude;
     double dLat = Math.toRadians(lat2-lat1);
     double dLon = Math.toRadians(lon2-lon1);
     double a = Math.sin(dLat/2) * Math.sin(dLat/2) +
    Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) *
    Math.sin(dLon/2) * Math.sin(dLon/2);
    double c = 2 * Math.asin(Math.sqrt(a));
    double valueResult= Radius*c;
    double km=valueResult/1;
    DecimalFormat newFormat = new DecimalFormat("####");
    int kmInDec =  Integer.valueOf(newFormat.format(km));
    double meter=valueResult%1000;
    int  meterInDec= Integer.valueOf(newFormat.format(meter));
    Log.i("Radius Value",""+valueResult+"   KM  "+kmInDec+" Meter   "+meterInDec);

    return Radius * c;
    }

But I'm getting very long distance as the result , for eg. I'm getting like 10947 km as the distance between two places which is only about 20 m far . Can anyone help me?

score 4 · Answer 1 · answered Feb 12 '14 at 05:37

4

Android offers method for calculating distance between two lat/lon points.

android.location.Location.distanceBetween(double startLatitude,
    double startLongitude, double endLatitude, double endLongitude, float[] results)

answered Feb 12 '14 at 05:37

Niko

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sudanix · Accepted Answer · 2014-02-12T05:45:21.447

Search about Haversine equation. here's one implementation which return the distance in Meter:

public static double haversine(double lat1, double lon1, double lat2, double lon2) {
    double dLat = Math.toRadians(lat2 - lat1);
    double dLon = Math.toRadians(lon2 - lon1);
    lat1 = Math.toRadians(lat1);
    lat2 = Math.toRadians(lat2);

    double a = Math.sin(dLat / 2) * Math.sin(dLat / 2) + Math.sin(dLon / 2) * Math.sin(dLon / 2) * Math.cos(lat1) * Math.cos(lat2);

    double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));

    return R * c;
}

Where R = 6371000;

score 0 · Answer 3 · edited May 23 '17 at 12:06

0

Use this method :

        private double distance(double lat1, double lon1, double lat2,
            double lon2) {
        double theta = lon1 - lon2;
        double dist = Math.sin(deg2rad(lat1)) * Math.sin(deg2rad(lat2))
                + Math.cos(deg2rad(lat1)) * Math.cos(deg2rad(lat2))
                * Math.cos(deg2rad(theta));
        dist = Math.acos(dist);
        dist = rad2deg(dist);
        dist = dist * 60 * 1.1515;
        return (dist);
    }

Or just check this conversation

edited May 23 '17 at 12:06

Community

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1

answered Feb 12 '14 at 05:38

Ranjit

5,130
3
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can u provide deg2rad method? – EasterKim Feb 12 '14 at 07:03
see this link http://stackoverflow.com/questions/6981916/how-to-calculate-distance-between-two-locations-using-their-longitude-and-latitu ... – Ranjit Feb 12 '14 at 07:19

score 0 · Answer 4 · answered Feb 12 '14 at 06:06

Method to calculate distance in Kilometers

public static double distanceKM(double lat1, double lon1, double lat2,
            double lon2) {
        int EARTH_RADIUS_KM = 6371;
        double lat1Rad = Math.toRadians(lat1);
        double lat2Rad = Math.toRadians(lat2);
        double deltaLonRad = Math.toRadians(lon2 - lon1);

        double dist_travelled = Math
                .acos(Math.sin(lat1Rad) * Math.sin(lat2Rad) + Math.cos(lat1Rad)
                        * Math.cos(lat2Rad) * Math.cos(deltaLonRad))
                * EARTH_RADIUS_KM;

        dist_travelled = Double.parseDouble(new DecimalFormat("##.######")
                .format(dist_travelled));
        return dist_travelled;

    }

how to get distance between two places in kilometer in google map v2 using LatLng

4 Answers4