/// <summary>
/// WGS-84转换GCJ-02
/// </summary>
/// <param name="wgLat">纬度</param>
/// <param name="wgLon">经度</param>
/// <returns></returns>
public static GPSPoint WGS84_to_GCJ02(double wgLat, double wgLon)
{
GPSPoint point = new GPSPoint();
if (OutOfChina(wgLat, wgLon))
{
point.SetLat(wgLat);
point.SetLng(wgLon);
return(point);
}
double dLat = TransformLat(wgLon - 105.0, wgLat - 35.0);
double dLon = TransformLon(wgLon - 105.0, wgLat - 35.0);
double radLat = wgLat / 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 lat = wgLat + dLat;
double lon = wgLon + dLon;
point.SetLat(lat);
point.SetLng(lon);
return(point);
}
/// <summary>
/// BD-09转换GCJ-02
/// </summary>
/// <param name="bd_lat">纬度</param>
/// <param name="bd_lon">经度</param>
/// <returns></returns>
public static GPSPoint BD09_to_GCJ02(double bd_lat, double bd_lon)
{
GPSPoint point = new GPSPoint();
double x = bd_lon - 0.0065, y = bd_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);
point.SetLat(gg_lat);
point.SetLng(gg_lon);
return(point);
}
/// <summary>
/// GCJ-02转换BD-09
/// </summary>
/// <param name="gg_lat">纬度</param>
/// <param name="gg_lon">经度</param>
/// <returns></returns>
public static GPSPoint GCJ02_to_BD09(double gg_lat, double gg_lon)
{
GPSPoint point = new GPSPoint();
double x = gg_lon, y = gg_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 bd_lon = z * Math.Cos(theta) + 0.0065;
double bd_lat = z * Math.Sin(theta) + 0.006;
point.SetLat(bd_lat);
point.SetLng(bd_lon);
return(point);
}