/* ---------------------------------------------------------- * 文件名称:MapConverter.cs * * 作者:秦建辉 * * 微信:splashcn * * 博客:http://www.firstsolver.com/wordpress/ * * 开发环境: * Visual Studio V2017 * .NETCore 1.1 * * 版本历史: * V1.0 2017年05月16日 * 坐标转换器 * * 说明: * 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。 * GCJ02:又称火星坐标系,是由中国国家测绘局制定的地理坐标系统,是由WGS84加密后得到的坐标系。 * BD09:为百度坐标系,在GCJ02坐标系基础上再次加密。其中bd09ll表示百度经纬度坐标,bd09mc表示百度墨卡托米制坐标。 * * 参考资料: * https://www.oschina.net/code/snippet_260395_39205 ------------------------------------------------------------ */ using System; namespace Com.FirstSolver.Splash { /// <summary> /// WGS-84、GCJ-02(火星坐标系)、BD-09(百度坐标系)之间的坐标转换器 /// </summary> public static class MapConverter { /// <summary> /// 圆周率 /// </summary> private const double PI = 3.1415926535897932384626; private const double X_PI = PI * 3000.0 / 180.0; /// <summary> /// 地理位置是否位于中国以外 /// </summary> /// <param name="wgLat">WGS-84坐标纬度</param> /// <param name="wgLon">WGS-84坐标经度</param> /// <returns> /// true:国外 /// false:国内 /// </returns> public static bool OutOfChina(double wgLat, double wgLon) { if (wgLon < 72.004 || wgLon > 137.8347) return true; if (wgLat < 0.8293 || wgLat > 55.8271) return true; return false; } /// <summary> /// WGS-84坐标系转火星坐标系 (GCJ-02) /// </summary> /// <param name="wgLat">WGS-84坐标纬度</param> /// <param name="wgLon">WGS-84坐标经度</param> /// <param name="mgLat">输出:GCJ-02坐标纬度</param> /// <param name="mgLon">输出:GCJ-02坐标经度</param> public static void WGS84ToGCJ02(double wgLat, double wgLon, out double mgLat, out double mgLon) { if (OutOfChina(wgLat, wgLon)) { mgLat = wgLat; mgLon = wgLon; } else { double dLat; double dLon; Delta(wgLat, wgLon, out dLat, out dLon); mgLat = wgLat + dLat; mgLon = wgLon + dLon; } } /// <summary> /// 火星坐标系 (GCJ-02)转WGS-84坐标系 /// </summary> /// <param name="mgLat">GCJ-02坐标纬度</param> /// <param name="mgLon">GCJ-02坐标经度</param> /// <param name="wgLat">输出:WGS-84坐标纬度</param> /// <param name="wgLon">输出:WGS-84坐标经度</param> public static void GCJ02ToWGS84(double mgLat, double mgLon, out double wgLat, out double wgLon) { if (OutOfChina(mgLat, mgLon)) { wgLat = mgLat; wgLon = mgLon; } else { double dLat; double dLon; Delta(mgLat, mgLon, out dLat, out dLon); wgLat = mgLat - dLat; wgLon = mgLon - dLon; } } /// <summary> /// 火星坐标系 (GCJ-02)转WGS-84坐标系 /// </summary> /// <param name="mgLat">GCJ-02坐标纬度</param> /// <param name="mgLon">GCJ-02坐标经度</param> /// <param name="wgLat">输出:WGS-84坐标纬度</param> /// <param name="wgLon">输出:WGS-84坐标经度</param> public static void GCJ02ToWGS84Exact(double mgLat, double mgLon, out double wgLat, out double wgLon) { const double InitDelta = 0.01; const double Threshold = 0.000001; double dLat = InitDelta; double dLon = InitDelta; double mLat = mgLat - dLat; double mLon = mgLon - dLon; double pLat = mgLat + dLat; double pLon = mgLon + dLon; double nLat; double nLon; int i = 0; do { wgLat = (mLat + pLat) / 2; wgLon = (mLon + pLon) / 2; WGS84ToGCJ02(wgLat, wgLon, out nLat, out nLon); dLat = nLat - mgLat; dLon = nLon - mgLon; if ((Math.Abs(dLat) < Threshold) && (Math.Abs(dLon) < Threshold)) break; if (dLat > 0) pLat = wgLat; else mLat = wgLat; if (dLon > 0) pLon = wgLon; else mLon = wgLon; } while (++i <= 30); } /// <summary> /// 百度坐标系 (BD-09)转火星坐标系 (GCJ-02) /// </summary> /// <param name="bdLat">百度坐标系纬度</param> /// <param name="bdLon">百度坐标系经度</param> /// <param name="mgLat">输出:GCJ-02坐标纬度</param> /// <param name="mgLon">输出:GCJ-02坐标经度</param> public static void BD09ToGCJ02(double bdLat, double bdLon, out double mgLat, out double mgLon) { double x = bdLon - 0.0065; double y = bdLat - 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); mgLat = z * Math.Sin(theta); mgLon = z * Math.Cos(theta); } /// <summary> /// 火星坐标系 (GCJ-02)转百度坐标系 (BD-09) /// </summary> /// <param name="mgLat">GCJ-02坐标纬度</param> /// <param name="mgLon">GCJ-02坐标经度</param> /// <param name="bdLat">输出:百度坐标系纬度</param> /// <param name="bdLon">输出:百度坐标系经度</param> public static void GCJ02ToBD09(double mgLat, double mgLon, out double bdLat, out double bdLon) { double x = mgLon; double y = mgLat; 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); bdLat = z * Math.Sin(theta) + 0.006; bdLon = z * Math.Cos(theta) + 0.0065; } /// <summary> /// WGS-84坐标系转百度坐标系 (BD-09) /// </summary> /// <param name="wgLat">WGS-84坐标纬度</param> /// <param name="wgLon">WGS-84坐标经度</param> /// <param name="bdLat">输出:百度坐标系纬度</param> /// <param name="bdLon">输出:百度坐标系经度</param> public static void WGS84ToBD09(double wgLat, double wgLon, out double bdLat, out double bdLon) { double mgLat; double mgLon; WGS84ToGCJ02(wgLat, wgLon, out mgLat, out mgLon); GCJ02ToBD09(mgLat, mgLon, out bdLat, out bdLon); } /// <summary> /// 百度坐标系 (BD-09)转WGS-84坐标系 /// </summary> /// <param name="bdLat">百度坐标系纬度</param> /// <param name="bdLon">百度坐标系经度</param> /// <param name="wgLat">输出:WGS-84坐标纬度</param> /// <param name="wgLon">输出:WGS-84坐标经度</param> public static void BD09ToWGS84(double bdLat, double bdLon, out double wgLat, out double wgLon) { double mgLat; double mgLon; BD09ToGCJ02(bdLat, bdLon, out mgLat, out mgLon); GCJ02ToWGS84(mgLat, mgLon, out wgLat, out wgLon); } public static double Distance(double LatA, double LonA, double LatB, double LonB) { const double EarthR = 6371000.0; double x = Math.Cos(LatA * PI / 180.0) * Math.Cos(LatB * PI / 180.0) * Math.Cos((LonA - LonB) * PI / 180); double y = Math.Sin(LatA * PI / 180.0) * Math.Sin(LatB * PI / 180.0); double s = x + y; if (s > 1) s = 1; if (s < -1) s = -1; return Math.Acos(s) * EarthR; } private static void Delta(double Lat, double Lon, out double dLat, out double dLon) { const double AXIS = 6378245.0; const double EE = 0.00669342162296594323; dLat = TransformLat(Lon - 105.0, Lat - 35.0); 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) / ((AXIS * (1 - EE)) / (magic * sqrtMagic) * PI); dLon = (dLon * 180.0) / (AXIS / sqrtMagic * Math.Cos(radLat) * PI); } private 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; } private 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; } } }