I am trying to use this implementation of Haversine formula given on wikipedia for trial but this formula is not giving expected result.
public class Haversine {
public static final double R = 6372.8; // In kilometers
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.asin(Math.sqrt(a));
return R * c;
}
public static void main(String[] args) {
System.out.println(haversine(36.12, -86.67, 33.94, -118.40));
}
}
Input GPS latitude format : ddmm.mmmm
Input GPS longitude format : dddmm.mmmm
Above formats for lat-lon are specified in requirement document.
Sample input coordinates are as below :
lat1 = 3359.64868, lon1 = 8356.178
lat2 = 3359.649, lon2 = 8356.178
Before passing these values to Haversine method, I am converting these values into degrees format. Please correct me if this step is not necessary.
I am using formula below to convert from degree minute format to Decimal degree format :
Decimal Degree = degree + (minute / 60)
So new coordinates become
lat1 = 33 + (59.64868 / 60) = 33.994144666666664
lon1 = 83 + (56.178 / 60) = 83.9363
lat2 = 33 + (59.649 / 60) = 33.99415
lon2 = 83 + (56.178 / 60) = 83.9363
Call to haversine method becomes like
haversine(33.994144666666664, 83.9363, 33.99415, 83.9363)
which is returning value 5.932071604620887E-4
To validate the values, I provided same input (33.994144666666664, 83.9363, 33.99415, 83.9363) to converter present on this website but it gives result as 0.001 km.
I tried to provide input values without converting to decimal degrees but then also output from two methods is not matching.
Can anyone please tell me what mistake I am doing here?
