iOS 百度坐标、GPS坐标、 高德坐标相互转换
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参考技术A 一、坐标简介目前国内主流坐标系类型主要有三种：WGS84、GCJ02、BD09；
1.WGS84：为一种大地坐标系，也是目前广泛使用的GPS全球卫星定位系统使用的坐标系，如：ios系统自带地图坐标。
二、一般项目集成的sdk都支持别的坐标转成自己的坐标，如百度地图支持WGS84和GCJ02转BD09ll，也支持BD09ll转GCJ02，但是 ，下面就主要介绍一下GCJ02和BD09ll转WGS84
二、BD09ll转GCJ02
三、GCJ02转WGS84（只支持国内）
四、BD09ll转WGS84，目前的做法是先将BD09ll坐标转成GCJ02坐标，然后再转成WGS84坐标。
五、经实测，转换后的坐标 ，另GCJ02坐标转WGS84坐标有一个更精确的算法，不过里面设计到了递归。
GPS谷歌百度高德坐标相互转换
转:https://blog.csdn.net/bopisky/article/details/80756322
public class GpsUtil { 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; 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 }; } public static bool OutOfChina(double lat, double lon) { if (lon < 72.004 || lon > 137.8347) return true; if (lat < 0.8293 || lat > 55.8271) return true; return false; } /** * 84 to 火星坐标系 (GCJ-02) World Geodetic System ==> Mars Geodetic System * * @param lat * @param lon * @return */ public static double[] Gps84ToGcj02(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 }; } /** * * 火星坐标系 (GCJ-02) to 84 * * @param lon * @param lat * @return * */ public static double[] Gcj02ToGps84(double lat, double lon) { double[] gps = transform(lat, lon); double lontitude = lon * 2 - gps[1]; double latitude = lat * 2 - gps[0]; return new double[] { latitude, lontitude }; } /// <summary> /// 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换算法 将 GCJ-02 坐标转换成 BD-09 坐标 /// 高德谷歌转为百度 /// </summary> /// <param name="lat"></param> /// <param name="lon"></param> /// <returns></returns> public static double[] Gcj02ToBd09(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 tempLon = z * Math.Cos(theta) + 0.0065; double tempLat = z * Math.Sin(theta) + 0.006; double[] gps = { tempLat, tempLon }; return gps; } /// <summary> /// 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换算法 * * 将 BD-09 坐标转换成GCJ-02 坐标 /// 百度坐标转为高德谷歌坐标 /// </summary> /// <param name="lat"></param> /// <param name="lon"></param> /// <returns></returns> public static double[] Bd09ToGcj02(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 tempLon = z * Math.Cos(theta); double tempLat = z * Math.Sin(theta); double[] gps = { tempLat, tempLon }; return gps; } /// <summary> /// gps84转为bd09 /// GPS坐标转为百度坐标 /// </summary> /// <param name="lat"></param> /// <param name="lon"></param> /// <returns></returns> public static double[] Gps84ToBd09(double lat, double lon) { double[] gcj02 = Gps84ToGcj02(lat, lon); double[] bd09 = Gcj02ToBd09(gcj02[0], gcj02[1]); return bd09; } /// <summary> /// 百度坐标转成GPS坐标 /// </summary> /// <param name="lat"></param> /// <param name="lon"></param> /// <returns></returns> public static double[] Bd09ToGps84(double lat, double lon) { double[] gcj02 = Bd09ToGcj02(lat, lon); double[] gps84 = Gcj02ToGps84(gcj02[0], gcj02[1]); //保留小数点后六位 gps84[0] = Retain6(gps84[0]); gps84[1] = Retain6(gps84[1]); return gps84; } /// <summary> /// 保留小数点后六位 /// </summary> /// <param name="num"></param> /// <returns></returns> private static double Retain6(double num) { String result = String.Format("%.6f", num); return Double.Parse(result); } }
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