google 地图 百度地图坐标互转

/**

 * 地图坐标转换 google,baidu,gps

 * @author lw

 * @Time 2015年4月16日18:19:16

 *

 * */

public class CoordinateConversion {

    private static final double x_pi = 3.14159265358979324 * 3000.0 / 180.0;

    private static final double pi = 3.14159265358979324;

    private static final double a = 6378245.0;

    private static final double ee = 0.00669342162296594323;

    /**

     * gg_lat 纬度

     * gg_lon 经度

     * GCJ-02转换BD-09

     * Google地图经纬度转百度地图经纬度

     * */

    public static Point google_bd_encrypt(double gg_lat, double gg_lon){

        Point point=new Point();

        double x = gg_lon, y = gg_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;

        point.setLat(bd_lat);

        point.setLng(bd_lon);

        return point;

    }

    /**

     * wgLat 纬度

     * wgLon 经度

     * BD-09转换GCJ-02

     * 百度转google

     * */

    public static Point bd_google_encrypt(double bd_lat, double bd_lon){

        Point point=new Point();

        double x = bd_lon - 0.0065, y = bd_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); 

        point.setLat(gg_lat);

        point.setLng(gg_lon);

        return point;

    }

    /**

     * wgLat 纬度

     * wgLon 经度

     * WGS-84 到 GCJ-02 的转换（即 GPS 加偏）

     * */

    public static Point wgs_gcj_encrypts(double wgLat, double wgLon) {

        Point point=new Point();

        if (outOfChina(wgLat, wgLon)) {

            point.setLat(wgLat);

            point.setLng(wgLon);

            return point;

        }

        double dLat = transformLat(wgLon - 105.0, wgLat - 35.0);

        double dLon = transformLon(wgLon - 105.0, wgLat - 35.0);

        double radLat = wgLat / 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 lat = wgLat + dLat;

        double lon = wgLon + dLon;

        point.setLat(lat);

        point.setLng(lon);

        return point;

    }

非本人原创

原文http://my.oschina.net/Thinkeryjgfn/blog/402565?fromerr=iCgT0WCK