高德、百度、GPS经纬度转换

经纬度标准

        WGS-84：是国际标准，GPS坐标（Google Earth使用、或者GPS模块）
        GCJ-02：中国坐标偏移标准，Google Map、高德、腾讯使用
        BD-09：百度坐标偏移标准，Baidu Map使用

        目前支持国内
        国外坐标可能需要修改

static double pi = 3.14159265358979324;
static double a = 6378245.0;
static double ee = 0.00669342162296594323;
public final static double x_pi = pi * 3000.0 / 180.0;

/**
 * 高德经纬度转百度经纬度
 */
public static double[] gcj2bd(double lat, double lon) {
    double z = Math.sqrt(lon * lon + lat * lat) + 0.00002 * Math.sin(lat * x_pi);
    double theta = Math.atan2(lat, lon) + 0.000003 * Math.cos(lon * 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 };
}

/**
 * 百度经纬度转高德
 */
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 };
}

/**
 * 国标经纬度转高德经纬度
 */
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;
    return new double[]{ mgLat, mgLon };
}

/**
 * 高德转到GPS
 */
public static double[] gcj2wgc(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 lontitude = lon * 2 - mgLon;
    double latitude = lat * 2 - mgLat;
    return new double[]{latitude, lontitude};
}

/**
 * 国标转百度
 */
public static double[] wgs2bd(double lat, double lon) {
    double[] wgs2gcj = wgs2gcj(lat, lon);
    return gcj2bd(wgs2gcj[0], wgs2gcj[1]);
}

/**
 * 经纬度转换
 */
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 = getRet(lat, lon, ret);
    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 getRet(double lat, double lon, double ret) {
    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;
    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 = getRet(lat, lat, ret);
    ret += (150.0 * Math.sin(lat / 12.0 * pi) + 300.0 * Math.sin(lat / 30.0 * pi)) * 2.0 / 3.0;
    return ret;
}