Distance Calculator-java
/*::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::*/
/*:: :*/
/*:: This routine calculates the distance between two points (given the :*/
/*:: latitude/longitude of those points). It is being used to calculate :*/
/*:: the distance between two locations using GeoDataSource (TM) products :*/
/*:: :*/
/*:: Definitions: :*/
/*:: Southern latitudes are negative, eastern longitudes are positive :*/
/*:: :*/
/*:: Function parameters: :*/
/*:: lat1, lon1 = Latitude and Longitude of point 1 (in decimal degrees) :*/
/*:: lat2, lon2 = Latitude and Longitude of point 2 (in decimal degrees) :*/
/*:: unit = the unit you desire for results :*/
/*:: where: 'M' is statute miles (default) :*/
/*:: 'K' is kilometers :*/
/*:: 'N' is nautical miles :*/
/*:: Worldwide cities and other features databases with latitude longitude :*/
/*:: are available at https://www.geodatasource.com :*/
/*:: :*/
/*:: For enquiries, please contact [email protected] :*/
/*:: :*/
/*:: Official Web site: https://www.geodatasource.com :*/
/*:: :*/
/*:: GeoDataSource.com (C) All Rights Reserved 2019 :*/
/*:: :*/
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import java.util.*;
import java.lang.*;
import java.io.*;
class DistanceCalculator
{
public static void main (String[] args) throws java.lang.Exception
{
System.out.println(distance(32.9697, -96.80322, 29.46786, -98.53506, "M") + " Miles\n");
System.out.println(distance(32.9697, -96.80322, 29.46786, -98.53506, "K") + " Kilometers\n");
System.out.println(distance(32.9697, -96.80322, 29.46786, -98.53506, "N") + " Nautical Miles\n");
}
private static double distance(double lat1, double lon1, double lat2, double lon2, String unit) {
if ((lat1 == lat2) && (lon1 == lon2)) {
return 0;
}
else {
double theta = lon1 - lon2;
double dist = Math.sin(Math.toRadians(lat1)) * Math.sin(Math.toRadians(lat2)) + Math.cos(Math.toRadians(lat1)) * Math.cos(Math.toRadians(lat2)) * Math.cos(Math.toRadians(theta));
dist = Math.acos(dist);
dist = Math.toDegrees(dist);
dist = dist * 60 * 1.1515;
if (unit.equals("K")) {
dist = dist * 1.609344;
} else if (unit.equals("N")) {
dist = dist * 0.8684;
}
return (dist);
}
}
}