Web Mercator Non-Conformal, Non-Mercator

 

public static void XYtoGL(Coordinate coordinate)
    {
        double R  = 6378137;
        coordinate.x = coordinate.x / Math.PI * 180.0 / R;        
        coordinate.y =  ((Math.atan(Math.exp(coordinate.y / R)) - Math.PI/4) / Math.PI * 180.0)*2;        
    }

public static void GLtoXY(Coordinate coordinate)
    {
        double R  = 6378137;
        coordinate.x = R * (coordinate.x - 0)/180 * Math.PI;
        coordinate.y = R * Math.log(Math.tan(Math.PI/4+coordinate.y/2*Math.PI/180));
    }