GPS坐标转换

package bean;
public class GpsCorrect {  
    final static double pi = 3.14159265358979324;  
    final static double a = 6378245.0;  
    final static double ee = 0.00669342162296594323;
    public final static double x_pi = 3.14159265358979324 * 3000.0 / 180.0;

  

    public static double[] wgs2bd(double lat, double lon) {
           double[] wgs2gcj = wgs2gcj(lat, lon);
           double[] gcj2bd = gcj2bd(wgs2gcj[0], wgs2gcj[1]);
           return gcj2bd;
    }


    public static double[] gcj2bd(double lat, double lon) {
           double x = lon, y = lat;
           double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
           double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);
           double bd_lon = z * Math.cos(theta) + 0.0065;
           double bd_lat = z * Math.sin(theta) + 0.006;
           return new double[] { bd_lat, bd_lon };
    }


    public static double[] bd2gcj(double lat, double lon) {
           double x = lon - 0.0065, y = lat - 0.006;
           double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);
           double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);
           double gg_lon = z * Math.cos(theta);
           double gg_lat = z * Math.sin(theta);
           return new double[] { gg_lat, gg_lon };
    }


    public static double[] wgs2gcj(double lat, double lon) {
           double dLat = transformLat(lon - 105.0, lat - 35.0);
           double dLon = transformLon(lon - 105.0, lat - 35.0);
           double radLat = lat / 180.0 * pi;
           double magic = Math.sin(radLat);
           magic = 1 - ee * magic * magic;
           double sqrtMagic = Math.sqrt(magic);
           dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
           dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
           double mgLat = lat + dLat;
           double mgLon = lon + dLon;
           double[] loc = { mgLat, mgLon };
           return loc;
    }


    private static double transformLat(double lat, double lon) {
           double ret = -100.0 + 2.0 * lat + 3.0 * lon + 0.2 * lon * lon + 0.1 * lat * lon + 0.2 * Math.sqrt(Math.abs(lat));
           ret += (20.0 * Math.sin(6.0 * lat * pi) + 20.0 * Math.sin(2.0 * lat * pi)) * 2.0 / 3.0;
           ret += (20.0 * Math.sin(lon * pi) + 40.0 * Math.sin(lon / 3.0 * pi)) * 2.0 / 3.0;
           ret += (160.0 * Math.sin(lon / 12.0 * pi) + 320 * Math.sin(lon * pi  / 30.0)) * 2.0 / 3.0;
           return ret;
    }


    private static double transformLon(double lat, double lon) {
           double ret = 300.0 + lat + 2.0 * lon + 0.1 * lat * lat + 0.1 * lat * lon + 0.1 * Math.sqrt(Math.abs(lat));
           ret += (20.0 * Math.sin(6.0 * lat * pi) + 20.0 * Math.sin(2.0 * lat * pi)) * 2.0 / 3.0;
           ret += (20.0 * Math.sin(lat * pi) + 40.0 * Math.sin(lat / 3.0 * pi)) * 2.0 / 3.0;
           ret += (150.0 * Math.sin(lat / 12.0 * pi) + 300.0 * Math.sin(lat / 30.0 * pi)) * 2.0 / 3.0;
           return ret;
    }
}