高德坐标系转天地图坐标系（GCJ02转WGS坐标系）

 高德坐标系转天地图坐标系（GCJ02转WGS坐标系）

private static double PI = 3.14159265358979324;
    public static double[] gcj02ToWgs(double lng, double lat) {
        double a = 6378245.0; //  a: 卫星椭球坐标投影到平面地图坐标系的投影因子。
        double ee = 0.00669342162296594323; //  ee: 椭球的偏心率。
        double lat1 = +lat;
        double lng1 = +lng;
        double dlat = transformLat(lng1 - 105.0, lat1 - 35.0);
        double dlng = transformLon(lng1 - 105.0, lat1 - 35.0);
        double radlat = lat1 / 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);
        dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);
        double mglat = lat1 + dlat;
        double mglng = lng1 + dlng;
        double [] latlng = new double[2];
        latlng[0] = lng1 * 2 - mglng;
        latlng[1] = lat1 * 2 - mglat;
        return latlng;
    }

    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;
    }