Calculate distance in meters when you know longitude and latitude in java

Question

Possible Duplicate  Working with latitude longitude values in Java   Duplicate   Working with latitude longitude values in Java How do I calculate distance between two latitude longitude points   I need to calculate the distance between two points given by two coordinates  The project I am working on is a Java-project  so Java-code will be great  but pseudo-code can also be given  then I can implement it myself    As you probably know  there are three ways to represent coordinates   Degrees Minutes Seconds  49  30 00 quot N  123  30 00 quot W  Degrees Decimal Minutes  49  30 0   -123  30 0     49d30 0m -123d30 0   Decimal Degrees  49 5000   -123 5000     generally with 4-6 decimal numbers   It s the third way my coordinates are given in  so the code for this values will be preferred

User · Answer

You can use the Java Geodesy Library for GPS, it uses the Vincenty's formulae which takes account of the earths surface curvature.

Implementation goes like this:

import org.gavaghan.geodesy.*;

...

GeodeticCalculator geoCalc = new GeodeticCalculator();

Ellipsoid reference = Ellipsoid.WGS84;  

GlobalPosition pointA = new GlobalPosition(latitude, longitude, 0.0); // Point A

GlobalPosition userPos = new GlobalPosition(userLat, userLon, 0.0); // Point B

double distance = geoCalc.calculateGeodeticCurve(reference, userPos, pointA).getEllipsoidalDistance(); // Distance between Point A and Point B

The resulting distance is in meters.

User · Answer

In C   it is done like this    define LOCAL PI 3 1415926535897932385   double ToRadians double degrees       double radians   degrees   LOCAL PI   180    return radians     double DirectDistance double lat1  double lng1  double lat2  double lng2       double earthRadius   3958 75    double dLat   ToRadians lat2-lat1     double dLng   ToRadians lng2-lng1     double a   sin dLat 2    sin dLat 2                  cos ToRadians lat1     cos ToRadians lat2                   sin dLng 2    sin dLng 2     double c   2   atan2 sqrt a   sqrt 1-a      double dist   earthRadius   c    double meterConversion   1609 00    return dist   meterConversion

User · Answer

Based on another question on stackoverflow  I got this code   This calculates the result in meters  not in miles      public static float distFrom float lat1  float lng1  float lat2  float 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

[java] Calculate distance in meters when you know longitude and latitude in java

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