Coordinates.distance() question

[hardc0d3r]

what formula does the Coordinates.distance() use? i would like to know because i want to convert x,y to latitude,longitude for a webapp..

[Tiger79]

check this out :

http://www.movable-type.co.uk/scripts/latlong.html

[assorec]

 
public static double distanceBetween(double lat1, double lon1, double lat2, double lon2) 
        {
            try {
                double lat1Rad = Math.toRadians(lat1);
                double lon1Rad = Math.toRadians(lon1);
                double lat2Rad = Math.toRadians(lat2);
                double lon2Rad = Math.toRadians(lon2);
                double dlat = lat2Rad - lat1Rad;
                double dlon = lon2Rad - lon1Rad;
                double a = Math.sin(dlat / 2.0) * Math.sin(dlat / 2.0) + Math.cos(lat1Rad) * Math.cos(lat2Rad) * Math.sin(dlon / 2.0) * Math.sin(dlon / 2.0);
                double c = 2.0 * Float11.asin(Math.min(1.0, Math.sqrt(a)));
                return 6367000.0 * c; // 6367000 = radius of Earth at 45° of latitude
            }
            catch (Exception e) {
                return Double.NEGATIVE_INFINITY;
        }
    
     }

you have to include a float11.java library

Rocco

[hardc0d3r]

thanks for the code and the link!!
another question... how can i convert the coordinates from gps to pixel coordinates?