The World Geodetic System (WGS) is a standard for use in cartography, geodesy, and satellite navigation including GPS. It comprises a standard coordinate system for the Earth, a standard spheroidal reference surface (the datum or reference ellipsoid) for raw altitude data, and a gravitational equipotential surface (the geoid) that defines the no…

WGS84Converter.java

import java.lang.Math;

public class WGS84Converter{

    // how to call methods
        // int[] dataXY = convertLatLonToWGS84(-94.420307, 44.968046);
        // System.out.println("DataXY: X="+dataXY[0]+" Y="+dataXY[1]);
        
        // double[] dataLonLat = convertWGS84ToLatLon(dataXY[0], dataXY[1]);
        // System.out.println("DataLotLan: X="+dataLonLat[0]+" Y="+dataLonLat[1]);
     
     private static int[] convertLatLonToWGS84(double lon, double lat){
         
         int x = (int)(lon * 20037508.34 / 180);
         int y = (int)(Math.log(Math.tan((90 + lat) * Math.PI / 360)) / (Math.PI / 180));
         
         y = (int)(y * 20037508.34 / 180);

         return new int[] {x,y};
     }
     
     private static double[] convertWGS84ToLatLon(int x, int y){
         
         double lon = (x / 20037508.34) * 180;
         double lat = (y / 20037508.34) * 180;
         
         lat = 180/Math.PI * (2 * Math.atan(Math.exp(lat * Math.PI / 180)) - Math.PI / 2);
         
         return new double[] {lon,lat};
     }
}