How can i calculate the distance between two gps points in Java?

Question

I used this code but it doesnt work:

Need the distance between two gps coordinates like 41.1212, 11.2323 in kilometers (Java)

double d2r = (180 / Math.PI);
double distance = 0;

try{
    double dlong = (endpoint.getLon() - startpoint.getLon()) * d2r;
    double dlat = (endpoint.getLat() - startpoint.getLat()) * d2r;
    double a =
        Math.pow(Math.sin(dlat / 2.0), 2)
            + Math.cos(startpoint.getLat() * d2r)
            * Math.cos(endpoint.getLat() * d2r)
            * Math.pow(Math.sin(dlong / 2.0), 2);
    double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
    double d = 6367 * c;

    return d;

} catch(Exception e){
    e.printStackTrace();
}

Your trigonometry approach would work really well if the Earth was a perfect sphere. However, it is actually an ellipsoid, so the radius from the surface to the Earth's core is variable depending on your position on the earth. To get an accurate distance measurement, you need to get a coordinate system library that can account for this. Assuming a sphere may be close enough for whatever you are doing, but if you need it to be very accurate, you'll need to find a good library. — A. Levy, Jan 06 '11 at 04:58
Duplicated from: [http://stackoverflow.com/questions/3694380/calculating-distance-between-two-points-using-latitude-longitude-what-am-i-doi][1] [1]: http://stackoverflow.com/questions/3694380/calculating-distance-between-two-points-using-latitude-longitude-what-am-i-doi — gonella, Jul 19 '15 at 12:29

score 20 · Answer 1 · answered Sep 15 '10 at 07:36

Longitude and latitude are given in degrees (0-360). If you want to convert degrees to radians (0-2π) you need to divide by 360 and multiply by 2π, (or equivalently, multiply by π/180). In your code however, you multiply by 180/π.

That is, change

double d2r = (180 / Math.PI);

into

double d2r = Math.PI / 180;

score 11 · Answer 2 · edited Feb 05 '15 at 21:27

have a look a Geocalc

Coordinate lat = new GPSCoordinate(41, .1212);
Coordinate lng = new GPSCoordinate(11, .2323);
Point point = new Point(lat, lng);

lat = new DegreeCoordinate(51.4613418);
lng = new DegreeCoordinate(-0.3035466);
Point point2 = new Point(lat, lng);
System.out.println("Distance is " + EarthCalc.getDistance(point2, point) / 1000 + " km");

Distance is 1448.7325760822912 km

I wrote that library for one my project.

score 8 · Answer 3 · edited Dec 03 '12 at 07:00

The solution from http://www.androidsnippets.com/distance-between-two-gps-coordinates-in-meter.

Only works if the points are close enough that you can omit that earth is not regular shape.


private double gps2m(float lat_a, float lng_a, float lat_b, float lng_b) {
    float pk = (float) (180/3.14169);

    float a1 = lat_a / pk;
    float a2 = lng_a / pk;
    float b1 = lat_b / pk;
    float b2 = lng_b / pk;

    float t1 = FloatMath.cos(a1)*FloatMath.cos(a2)*FloatMath.cos(b1)*FloatMath.cos(b2);
    float t2 = FloatMath.cos(a1)*FloatMath.sin(a2)*FloatMath.cos(b1)*FloatMath.sin(b2);
    float t3 = FloatMath.sin(a1)*FloatMath.sin(b1);
    double tt = Math.acos(t1 + t2 + t3);

    return 6366000*tt;
}
//

see Distance between two GPS coordinates in meter.

score 2 · Answer 4 · answered Dec 30 '11 at 07:46

2

Distance between two points (and lots of other useful things) can be found at: http://www.movable-type.co.uk/scripts/latlong.html

answered Dec 30 '11 at 07:46

peSHIr

6,279
1
34
46

score 1 · Answer 5 · answered Apr 26 '11 at 18:27

1

http://www.androidsnippets.com/distance-between-two-gps-coordinates-in-meter shows that double d2r = (180 / Math.PI);

answered Apr 26 '11 at 18:27

M.Hefny

2,677
1
26
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score 0 · Answer 6 · answered Dec 16 '16 at 22:05

0

The distance can be calculated with the Esri Geometry library: geodesicDistanceOnWGS84.

I would assume that JTS also has a method for computing distance.

answered Dec 16 '16 at 22:05

Randall Whitman

411
2
13

How can i calculate the distance between two gps points in Java?

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