坐标系转换工具类

/**
 * 坐标工具
 *
 * @author Cheng
 * @date 2021/04/07
 */
public class CoordinatesUtil {
    public static double pi = 3.1415926535897932384626;
    public static double x_pi = 3.14159265358979324 * 3000.0 / 180.0;
    public static double a = 6378245.0;
    public static double ee = 0.00669342162296594323;

    /**
     * 84 ==》 高德
     *
     * @param lon 经度
     * @param lat 纬度
     * @return
     */
    public static String gps84_To_Gcj02(double lon, double lat) {
        if (outOfChina(lat, lon)) {
            return lon + "," + lat;
        }
        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;
        return mgLon + "," + mgLat;
    }

    /**
     * 高德 ==》 84
     *
     * @param lon * @param lat * @return
     * @param lat 纬度
     * @param lon 经度
     */
    public static String gcj02_To_Gps84(double lon, double lat) {
        double[] gps = transform(lat, lon);
        double lontitude = lon * 2 - gps[1];
        double latitude = lat * 2 - gps[0];
        return lontitude + "," + latitude;
    }

    /**
     * 百度转高德
     *
     * @param bd_lon 经度
     * @param bd_lat 纬度
     * @return {@link String}
     */
    private static String bdToGaoDe(double bd_lon, double bd_lat) {
        double[] gd_lat_lon = new double[2];
        double PI = 3.14159265358979324 * 3000.0 / 180.0;
        double x = bd_lon - 0.0065, y = bd_lat - 0.006;
        double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * PI);
        double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * PI);
        gd_lat_lon[0] = z * Math.cos(theta);
        gd_lat_lon[1] = z * Math.sin(theta);
        return gd_lat_lon[0] + "," + gd_lat_lon[1];
    }

    /**
     * 百度转84
     *
     * @param lon 经度
     * @param lat 纬度
     * @return {@link String}
     */
    public static String bd09_To_gps84(double lon, double lat) {
        String[] gcj02 = bdToGaoDe(lon, lat).split(",");
        return gcj02_To_Gps84(Double.parseDouble(gcj02[0]), Double.parseDouble(gcj02[1]));
    }

    /**
     * 高德 == 》 百度
     *
     * @param lon 经度
     * @param lat 纬度
     */
    public static String gcj02_To_Bd09(double lon, double lat) {
        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 tempLon = z * Math.cos(theta) + 0.0065;
        double tempLat = z * Math.sin(theta) + 0.006;
        return tempLon + "," + tempLat;
    }

    /**
     * 84 == 》 百度
     *
     * @param lat 纬度
     * @param lon 经度
     * @return
     */
    public static String gps84_To_bd09(double lon, double lat) {
        String[] Gcj02 = gps84_To_Gcj02(lon, lat).split(",");
        return gcj02_To_Bd09(Double.parseDouble(Gcj02[0]), Double.parseDouble(Gcj02[1]));
    }
    
	/**
     * wgs84to墨卡托
     *
     * @param lng 经度
     * @param lat 纬度
     * @return {@link String}
     */
    public static String wgs84toMercator(double lng, double lat) {
        Map<String, Object> toMercator = new HashMap(3);
        toMercator.put("coords", lng + "," + lat);
        toMercator.put("from", 1);
        toMercator.put("to", 6);
        toMercator.put("ak", "UpCmCBcWeKShAgw46m6xwxT5QmBssBKy");
        try {
            return HttpUtils.httpGetRequest("http://api.map.baidu.com/geoconv/v1/", toMercator);
        } catch (URISyntaxException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 判断是否在中国
     *
     * @param lat
     * @param lon
     * @return
     */
    public static boolean outOfChina(double lat, double lon) {
        if (lon < 72.004 || lon > 137.8347) {
            return true;
        }
        return lat < 0.8293 || lat > 55.8271;
    }

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

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

    public static double[] transform(double lat, double lon) {
        if (outOfChina(lat, lon)) {
            return new double[]{lat, 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;
        return new double[]{mgLat, mgLon};
    }
}