/**
* 各地图API坐标系统比较与转换;
* WGS84坐标系：即地球坐标系，国际上通用的坐标系。设备一般包含GPS芯片或者北斗芯片获取的经纬度为WGS84地理坐标系,
* 谷歌地图采用的是WGS84地理坐标系（中国范围除外）;
* GCJ02坐标系：即火星坐标系，是由中国国家测绘局制订的地理信息系统的坐标系统。由WGS84坐标系经加密后的坐标系。
* 谷歌中国地图和搜搜中国地图采用的是GCJ02地理坐标系; BD09坐标系：即百度坐标系，GCJ02坐标系经加密后的坐标系;
* 搜狗坐标系、图吧坐标系等，估计也是在GCJ02基础上加密而成的。 chenhua
*/
public class LocationChage
{
public static string BAIDU_LBS_TYPE = "bd09ll";
public static double pi = 3.1415926535897932384626;
public static double a = 6378245.0;
public static double ee = 0.00669342162296594323;
//wgs84 to 火星坐标系 (GCJ-02) World Geodetic System ==> Mars Geodetic System
public static Gps gps84_To_Gcj02(double lat, double lon)
{
if (outOfChina(lat, lon))
{
return null;
}
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 Gps(mgLat, mgLon);
}
/**
* * 火星坐标系 (GCJ-02) to 84 * * @param lon * @param lat * @return
* */
public static Gps gcj_To_Gps84(double lat, double lon)
{
Gps gps = transform(lat, lon);
double lontitude = lon * 2 - gps.getWgLon();
double latitude = lat * 2 - gps.getWgLat();
return new Gps(latitude, lontitude);
}
/**
* 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
*
*/
public static Gps gcj02_To_Bd09(double gg_lat, double gg_lon)
{
double x = gg_lon, y = gg_lat;
double z = Math.Sqrt(x * x + y * y) + 0.00002 * Math.Sin(y * pi);
double theta = Math.Atan2(y, x) + 0.000003 * Math.Cos(x * pi);
double bd_lon = z * Math.Cos(theta) + 0.0065;
double bd_lat = z * Math.Sin(theta) + 0.006;
return new Gps(bd_lat, bd_lon);
}
/**
* * 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 * * @param
* bd_lat * @param bd_lon * @return
*/
public static Gps bd09_To_Gcj02(double bd_lat, double bd_lon)
{
double x = bd_lon - 0.0065, y = bd_lat - 0.006;
double z = Math.Sqrt(x * x + y * y) - 0.00002 * Math.Sin(y * pi);
double theta = Math.Atan2(y, x) - 0.000003 * Math.Cos(x * pi);
double gg_lon = z * Math.Cos(theta);
double gg_lat = z * Math.Sin(theta);
return new Gps(gg_lat, gg_lon);
}
/**
* (BD-09)-->84
*/
public static Gps bd09_To_Gps84(double bd_lat, double bd_lon)
{
Gps gcj02 = LocationChage.bd09_To_Gcj02(bd_lat, bd_lon);
Gps map84 = LocationChage.gcj_To_Gps84(gcj02.getWgLat(),
gcj02.getWgLon());
return map84;
}
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;
}
public static Gps transform(double lat, double lon)
{
if (outOfChina(lat, lon))
{
return new Gps(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 Gps(mgLat, mgLon);
}
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 class Gps
{
private double wgLat;
private double wgLon;
public Gps(double wgLat, double wgLon)
{
setWgLat(wgLat);
setWgLon(wgLon);
}
public double getWgLat()
{
return wgLat;
}
public void setWgLat(double wgLat)
{
this.wgLat = wgLat;
}
public double getWgLon()
{
return wgLon;
}
public void setWgLon(double wgLon)
{
this.wgLon = wgLon;
}
public override string ToString()
{
return wgLat + "," + wgLon;
}
}