座標轉換C#(Gcj02、wgs84、bd09互轉)
阿新 • • 發佈：2019-02-12
using System;
using System.Collections.Generic;
using System.Text;
namespace GMap.NET.Util
{
public static class ConvertGPS
{
private static double pi = 3.1415926535897932384626;
private static double a = 6378245.0;
private static double ee = 0.00669342162296594323;
private static double bd_pi = 3.14159265358979324 * 3000.0 / 180.0;
static Boolean 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; } 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; } 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; } /** * 84 to 火星座標系 (GCJ-02) World Geodetic System ==> Mars Geodetic System * * @param lat * @param lon * @return */ public static PointLatLng gps84_To_Gcj02(PointLatLng Gpoint) { if (outOfChina(Gpoint.Lat, Gpoint.Lng)) { return new PointLatLng(0, 0); } double dLat = transformLat(Gpoint.Lng - 105.0, Gpoint.Lat - 35.0); double dLon = transformLon(Gpoint.Lng - 105.0, Gpoint.Lat - 35.0); double radLat = Gpoint.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 = Gpoint.Lat + dLat; double mgLon = Gpoint.Lng + dLon; return new PointLatLng(mgLat, mgLon); } static PointLatLng transform(PointLatLng Gpoint) { if (outOfChina(Gpoint.Lat, Gpoint.Lng)) { return new PointLatLng(Gpoint.Lat, Gpoint.Lng); } double dLat = transformLat(Gpoint.Lng - 105.0, Gpoint.Lat - 35.0); double dLon = transformLon(Gpoint.Lng - 105.0, Gpoint.Lat - 35.0); double radLat = Gpoint.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 = Gpoint.Lat + dLat; double mgLon = Gpoint.Lng + dLon; return new PointLatLng(mgLat, mgLon); } /** * * 火星座標系 (GCJ-02) to 84 * * @param lon * @param lat * @return * */ public static PointLatLng gcj02_To_Gps84(PointLatLng Gpoint) { PointLatLng gps = transform(Gpoint); double lontitude = Gpoint.Lng * 2 - gps.Lng; double latitude = Gpoint.Lat * 2 - gps.Lat; return new PointLatLng(latitude, lontitude); } /** * 火星座標系 (GCJ-02) 與百度座標系 (BD-09) 的轉換演算法 將 GCJ-02 座標轉換成 BD-09 座標 * * @param gg_lat * @param gg_lon */ public static PointLatLng gcj02_To_Bd09(PointLatLng Gpoint) { double x = Gpoint.Lng, y = Gpoint.Lat; double z = Math.Sqrt(x * x + y * y) + 0.00002 * Math.Sin(y * bd_pi); double theta = Math.Atan2(y, x) + 0.000003 * Math.Cos(x * bd_pi); double bd_lon = z * Math.Cos(theta) + 0.0065; double bd_lat = z * Math.Sin(theta) + 0.006; return new PointLatLng(bd_lat, bd_lon); } /** * * 火星座標系 (GCJ-02) 與百度座標系 (BD-09) 的轉換演算法 * * 將 BD-09 座標轉換成GCJ-02 座標 * * @param * bd_lat * @param bd_lon * @return */ public static PointLatLng bd09_To_Gcj02(PointLatLng bdPoint) { double x = bdPoint.Lng - 0.0065, y = bdPoint.Lat - 0.006; double z = Math.Sqrt(x * x + y * y) - 0.00002 * Math.Sin(y * bd_pi); double theta = Math.Atan2(y, x) - 0.000003 * Math.Cos(x * bd_pi); double gg_lon = z * Math.Cos(theta); double gg_lat = z * Math.Sin(theta); return new PointLatLng(gg_lat, gg_lon); } /** * (BD-09)-->84 * @param bd_lat * @param bd_lon * @return */ public static PointLatLng bd09_To_Gps84(PointLatLng bdPoint) { PointLatLng gcj02 = bd09_To_Gcj02(bdPoint); PointLatLng map84 = gcj02_To_Gps84(gcj02); return map84; } /** * 84-->(BD-09) * @param bd_lat * @param bd_lon * @return */ public static PointLatLng Gps84_To_bd09(PointLatLng gpsPoint) { PointLatLng gcj02 = gps84_To_Gcj02(gpsPoint); PointLatLng bd09 = gcj02_To_Bd09(gcj02); return bd09; } }
}