Arthur Andy

Hi,

Below is the code to find distance between 2 Latitudes and Longitudes. But it is not working proper way.

////////////////////////////////

public double lanLatDistance(double oldlan, double oldlat,
double plan, double plat) {
double R = 6371; // earth’s radius (mean radius = 6,371km)
double dLat = Math.toRadians(oldlan - plan);

double dLon = Math.toRadians(oldlat - plat);
double a = (Math.sin(dLat / 2) * Math.sin(dLat / 2)) +
(Math.cos(Math.toRadians(oldlan)) * Math.cos(Math.toRadians(plan)) * Math.sin(dLon / 2) * Math.sin(dLon / 2));
double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
double distance = R * c;
//System.out.println("distance" + distance);

return distance;
}

///////////////////////////////

Please help me to find out where I am doing mistake.

Please mention in the piece of codes.


Thanks and Regards,
Andy

Shocker_33

I used this equation in an iPhone app and i had the same difficulty. I found the problem was in a trig function. I think the function that was playing up for me was the atan2() function.

You should track down the fault by making sure that each line of code gives you the correct answer. Should be easy enough using break points and a calculator.

JiMMaR

please use the [CODE] tag .. reading like this gives me headache >.<

try checking this

http://bit.ly/r7eyoO

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