LLA to ECEF convertion

Geo.java

 import static java.lang.Math.*;

 public class Geo {

    private static final double  a = 6378137.0;              // WGS-84 semi-major axis
    private static final double e2 = 6.6943799901377997e-3;  // WGS-84 first eccentricity squared

    /**
     * Convert Lat, Lon, Altitude to Earth-Centered-Earth-Fixed (ECEF).
     * Input is a three element array containing lat, lon (deg) and alt (m).
     * Returned array contains x, y, z in meters.
     */
     public static double[] geo_to_ecef(double[] geo) {
        double[] ecef = new double[3];
        double lat = geo[0]* Math.PI / 180;
        double lon = geo[1]* Math.PI / 180;
        double alt = geo[2];
        double n = a / sqrt(1 - e2*sin(lat) * sin(lat));

        ecef[0] = (n + alt) * cos(lat) * cos(lon);    // ECEF x
        ecef[1] = (n + alt) * cos(lat) * sin(lon);    // ECEF y
        ecef[2] = (n*(1 - e2) + alt) * sin(lat);      // ECEF z

        return ecef;
    }

    public static void main(String[] args) {
        double[] c = {34.127713, -117.825459, 250.64};

        for (double d : Coord.geo_to_ecef(c))
            System.out.println(d);
    }
}