/// <summary>
/// 转换坐标点根据经纬度
/// </summary>
/// <param name="lat">纬度后面一位必须带N or S</param>
/// <param name="lon">经度后面一位必须带E or W</param>
/// <returns></returns>
public static PointCoordinate GetPointCoordinate(string lat, string lon)
{
PointCoordinate p = new PointCoordinate();
if (lat.Substring(lat.Length - 1, 1) == "N")
{
lat = lat.Substring(0, lat.Length - 1);
p.Latitide = double.Parse(lat) / 10000;
}
else
{
lat = lat.Substring(0, lat.Length - 1);
p.Latitide = 0 - double.Parse(lat) / 10000;
}
if (lon.Substring(lon.Length - 1, 1) == "E")
{
lon = lon.Substring(0, lon.Length - 1);
p.Longitude = double.Parse(lon) / 10000;
}
else
{
lon = lon.Substring(0, lon.Length - 1);
p.Longitude = 0 - double.Parse(lon) / 10000;
}
return(p);
}
/// <summary>
/// 根据已经点、方位和角度，计算另一点坐标。
/// </summary>
/// <param name="angle">航线角(磁方向，弧度单位)</param>
/// <param name="distance">距离(公里)</param>
/// <param name="point">参考点</param>
/// <returns></returns>
public static PointCoordinate CalcuateCoordinate(PointCoordinate point, double angle,
double distance)
{
PointCoordinate p = new PointCoordinate();
double R = 6371.0; // earth's mean radius in km
double d = distance / R;
double lat1 = GreatCircleArgorithm.ConvertToARC(GreatCircleArgorithm.ConvertToDeg(point.Latitide));
double lon1 = GreatCircleArgorithm.ConvertToARC(GreatCircleArgorithm.ConvertToDeg(point.Longitude));
double brng = GreatCircleArgorithm.ConvertToDeg(angle) * Math.PI / 180; //将度转换为弧度
double lat2 = lat1 + d * Math.Cos(brng);
double dLat = lat2 - lat1;
double dPhi = Math.Log(Math.Tan(lat2 / 2 + Math.PI / 4) / Math.Tan(lat1 / 2 + Math.PI / 4));
double q = (Math.Abs(dLat) > 0.000000001) ? dLat / dPhi : Math.Cos(lat1);
double dlon = d * Math.Sin(brng) / q;
if (Math.Abs(lat2) > Math.PI / 2)
{
lat2 = lat2 > 0 ? Math.PI - lat2 : -Math.PI - lat2;
}
double lon2 = (lon1 + dlon + Math.PI) % (2 * Math.PI) - Math.PI;
p.Latitide = GreatCircleArgorithm.ConvertToDMS(GreatCircleArgorithm.ConvertToDegree(lat2));
p.Longitude = GreatCircleArgorithm.ConvertToDMS(GreatCircleArgorithm.ConvertToDegree(lon2));
return(p);
}
/// <summary>
/// 从某已知点和距离、方位角算另一点坐标
/// </summary>
/// <param name="point">已知点</param>
/// <param name="angle">方位角</param>
/// <param name="distance">距离（公里）</param>
/// <returns></returns>
public static PointCoordinate CalcuateCoordinate(PointCoordinate point, double angle, double distance)
{
double lat1 = ConvertToARC(ConvertToDeg(point.Latitide));
double lon1 = ConvertToARC(ConvertToDeg(point.Longitude));
double brng = ConvertToARC(ConvertToDeg(angle));
double lat2 = Math.Asin(Math.Sin(lat1) * Math.Cos(distance / R) +
Math.Cos(lat1) * Math.Sin(distance / R) * Math.Cos(brng));
double lon2 = lon1 + Math.Atan2(Math.Sin(brng) * Math.Sin(distance / R) * Math.Cos(lat1),
Math.Cos(distance / R) - Math.Sin(lat1) * Math.Sin(lat2));
lon2 = (lon2 + Math.PI) % (2 * Math.PI) - Math.PI; //;normalise to -180...+180
PointCoordinate p = new PointCoordinate();
p.Longitude = ConvertToDMS(ConvertToDegree(lon2));
p.Latitide = ConvertToDMS(ConvertToDegree(lat2));
return(p);
/*
* var R = 6371; // earth's mean radius in km
* var lat1 = this.lat.toRad(), lon1 = this.lon.toRad();
* brng = brng.toRad();
*
* var lat2 = Math.asin( Math.sin(lat1)*Math.cos(d/R) +
* Math.cos(lat1)*Math.sin(d/R)*Math.cos(brng) );
* var lon2 = lon1 + Math.atan2(Math.sin(brng)*Math.sin(d/R)*Math.cos(lat1),
* Math.cos(d/R)-Math.sin(lat1)*Math.sin(lat2));
* lon2 = (lon2+Math.PI)%(2*Math.PI) - Math.PI; // normalise to -180...+180
*
* if (isNaN(lat2) || isNaN(lon2)) return null;
* return new LatLon(lat2.toDeg(), lon2.toDeg());
*
* */
}
/// <summary>
/// 计算两点间角度
/// </summary>
/// <param name="firstPoint"></param>
/// <param name="endPoint"></param>
/// <returns></returns>
public static double CalculateAngle(PointCoordinate firstPoint, PointCoordinate endPoint)
{
double lat2 = ConvertToARC(ConvertToDeg(endPoint.Latitide));
double lat1 = ConvertToARC(ConvertToDeg(firstPoint.Latitide));
double lon2 = ConvertToARC(ConvertToDeg(endPoint.Longitude));
double lon1 = ConvertToARC(ConvertToDeg(firstPoint.Longitude));
double dLon = lon2 - lon1;
double y = Math.Sin(dLon) * Math.Cos(lat2);
double x = Math.Cos(lat1) * Math.Sin(lat2) -
Math.Sin(lat1) * Math.Cos(lat2) * Math.Cos(dLon);
double angle = Math.Atan2(y, x);
angle = (angle + Math.PI * 2) % (Math.PI * 2);
return(ConvertToDMS(ConvertToDegree(angle)));
/*
*
* lat1 = lat1.toRad(); lat2 = lat2.toRad();
* var dLon = (lon2-lon1).toRad();
*
* var y = Math.sin(dLon) * Math.cos(lat2);
* var x = Math.cos(lat1)*Math.sin(lat2) -
* Math.sin(lat1)*Math.cos(lat2)*Math.cos(dLon);
* return Math.atan2(y, x).toBrng();
*/
}
/// <summary>
/// 计算两点距离
/// </summary>
/// <param name="firstPoint"></param>
/// <param name="endPoint"></param>
/// <returns></returns>
public static double CalculateDistance(PointCoordinate firstPoint, PointCoordinate endPoint)
{
double lat2 = ConvertToARC(ConvertToDeg(endPoint.Latitide));
double lat1 = ConvertToARC(ConvertToDeg(firstPoint.Latitide));
double lon2 = ConvertToARC(ConvertToDeg(endPoint.Longitude));
double lon1 = ConvertToARC(ConvertToDeg(firstPoint.Longitude));
double dLat = lat2 - lat1;
double dLon = lon2 - lon1;
double a = Math.Sin(dLat / 2) * Math.Sin(dLat / 2) + Math.Cos(lat1) * Math.Cos(lat2) *
Math.Sin(dLon / 2) * Math.Sin(dLon / 2);
double c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
return(R * c);
/*
* var R = 6371; // earth's mean radius in km
* var dLat = (lat2-lat1).toRad();
* var dLon = (lon2-lon1).toRad();
* lat1 = lat1.toRad(), lat2 = lat2.toRad();
*
* var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
* Math.cos(lat1) * Math.cos(lat2) *
* Math.sin(dLon/2) * Math.sin(dLon/2);
* var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
* var d = R * c;
* return d;
* }
* */
}
/// <summary>
/// 计算两点的角度。
/// </summary>
/// <param name="firstPoint"></param>
/// <param name="endPoint"></param>
/// <returns>返回60进制的度分秒角度 </returns>
public static double CalculateAngle(PointCoordinate firstPoint, PointCoordinate endPoint)
{
double lat2 = GreatCircleArgorithm.ConvertToDeg(endPoint.Latitide);
double lon2 = GreatCircleArgorithm.ConvertToDeg(endPoint.Longitude);
double lat1 = GreatCircleArgorithm.ConvertToDeg(firstPoint.Latitide);
double lon1 = GreatCircleArgorithm.ConvertToDeg(firstPoint.Longitude);
double dLon = GreatCircleArgorithm.ConvertToARC((lon2 - lon1));
double dPhi = Math.Log(Math.Tan(GreatCircleArgorithm.ConvertToARC(lat2) / 2 + Math.PI / 4) / Math.Tan(GreatCircleArgorithm.ConvertToARC(lat1) / 2 + Math.PI / 4));
if (Math.Abs(dLon) > Math.PI)
{
dLon = dLon > 0 ? -(2 * Math.PI - dLon) : (2 * Math.PI + dLon);
}
double angle = Math.Atan2(dLon, dPhi);
return(GreatCircleArgorithm.ConvertToDMS((GreatCircleArgorithm.ConvertToDegree(angle) + 360) % 360));
}
/// <summary>
/// 计算两点间距离。
/// see http://williams.best.vwh.net/avform.htm#Rhumb
/// </summary>
/// <param name="firstPoint"></param>
/// <param name="endPoint"></param>
/// <returns></returns>
public static double CalculateDistance(PointCoordinate firstPoint, PointCoordinate endPoint)
{
double R = 6371;
double lat2 = GreatCircleArgorithm.ConvertToDeg(endPoint.Latitide);
double lon2 = GreatCircleArgorithm.ConvertToDeg(endPoint.Longitude);
double lat1 = GreatCircleArgorithm.ConvertToDeg(firstPoint.Latitide);
double lon1 = GreatCircleArgorithm.ConvertToDeg(firstPoint.Longitude);
double dLat = GreatCircleArgorithm.ConvertToARC(lat2 - lat1);
double dLon = Math.Abs(GreatCircleArgorithm.ConvertToARC(lon2 - lon1));
double dPhi = Math.Log(Math.Tan(GreatCircleArgorithm.ConvertToARC(lat2) / 2 + Math.PI / 4) / Math.Tan(GreatCircleArgorithm.ConvertToARC(lat1) / 2 + Math.PI / 4));
double q = (Math.Abs(dLat) > 0.00000001) ? dLat / dPhi : Math.Cos(GreatCircleArgorithm.ConvertToARC(lat1));
if (dLon > Math.PI)
{
dLon = 2 * Math.PI - dLon;
}
double d = Math.Sqrt(dLat * dLat + q * q * dLon * dLon);
return(d * R);
}
/// <summary>
/// 根据两点计算坐标。
/// 已经两点坐标，已知未知点到2点的方位角
/// </summary>
/// <param name="point1">第一点坐标</param>
/// <param name="point2">第二点坐标</param>
///<param name="angle1">到第一点的方位角</param>
/// <param name="angle2">到第二点的方位角</param>
/// <returns>坐标</returns>
public static PointCoordinate CalcuateCoordinate(PointCoordinate point1, double angle1, PointCoordinate point2, double angle2)
{
PointCoordinate p = new PointCoordinate();
//这个算法东经是负，西经是正，需要转换
double lat1 = ConvertToARC(ConvertToDeg(point1.Latitide));
double lon1 = ConvertToARC(ConvertToDeg(-point1.Longitude));
double lat2 = ConvertToARC(ConvertToDeg(point2.Latitide));
double lon2 = ConvertToARC(ConvertToDeg(-point2.Longitude));
PointCoordinate tempPoint1 = CalcuateCoordinate(point1, angle1, 20000); //第一点方向上的临时点
PointCoordinate tempPoint2 = CalcuateCoordinate(point2, angle2, 20000); //第二点方向上的临时点
angle1 = ConvertToARC(ConvertToDeg(angle1));
angle2 = ConvertToARC(ConvertToDeg(angle2));
double d = Math.PI / 2;
double lat1_1 = Math.Asin(sin(lat1) * cos(d) + cos(lat1) * sin(d) * cos(angle1));
double lon1_1 = Math.Atan2(sin(angle1) * sin(d) * cos(lat1), cos(d) - sin(lat1) * sin(lat1_1));
lon1_1 = Modlon(lon1 - lon1_1);
double lat2_1 = Math.Asin(sin(lat2) * cos(d) + cos(lat2) * sin(d) * cos(angle2));
double lon2_1 = Math.Atan2(sin(angle2) * sin(d) * cos(lat2), cos(d) - sin(lat2) * sin(lat2_1));
lon2_1 = Modlon(lon2 - lon2_1);
double a1 = sin(lat1 - lat1_1) * sin((lon1 + lon1_1) / 2) * cos((lon1 - lon1_1) / 2)
- sin(lat1 + lat1_1) * cos((lon1 + lon1_1) / 2) * sin((lon1 - lon1_1) / 2);
double b1 = sin(lat1 - lat1_1) * cos((lon1 + lon1_1) / 2) * cos((lon1 - lon1_1) / 2) +
sin(lat1 + lat1_1) * sin((lon1 + lon1_1) / 2) * sin((lon1 - lon1_1) / 2);
double c1 = cos(lat1) * cos(lat1_1) * sin(lon1 - lon1_1);
double a2 = sin(lat2 - lat2_1) * sin((lon2 + lon2_1) / 2) * cos((lon2 - lon2_1) / 2)
- sin(lat2 + lat2_1) * cos((lon2 + lon2_1) / 2) * sin((lon2 - lon2_1) / 2);
double b2 = sin(lat2 - lat2_1) * cos((lon2 + lon2_1) / 2) * cos((lon2 - lon2_1) / 2) +
sin(lat2 + lat2_1) * sin((lon2 + lon2_1) / 2) * sin((lon2 - lon2_1) / 2);
double c2 = cos(lat2) * cos(lat2_1) * sin(lon2 - lon2_1);
double A = b1 * c2 - c1 * b2; //v1(2) * v2(3) - v1(3) * v2(2)
double B = c1 * a2 - a1 * c2; //v1(3) * v2(1) - v1(1) * v2(3)
double C = a1 * b2 - b1 * a2; //v1(1) * v2(2) - v1(2) * v2(1))
double Lat01 = Math.Atan2(C, Math.Sqrt(A * A + B * B));
double Lon01 = Math.Atan2(-B, A);
PointCoordinate r1 = new PointCoordinate();
r1.Latitide = ConvertToDMS(ConvertToDegree(Lat01));
r1.Longitude = -ConvertToDMS(ConvertToDegree(Lon01));
PointCoordinate r2 = new PointCoordinate();
r2.Latitide = ConvertToDMS(ConvertToDegree(-Lat01));
r2.Longitude = -ConvertToDMS(ConvertToDegree(Modlon(Lon01 + Math.PI)));
//有两点，只用最近的点。
double ta = CalculateDistance(r1, point1);
//double ta1 = CalculateAngle(r2, point1);
//mqg于20110831增加，应该用计算距离的方法
double ta1 = CalculateDistance(r2, point1);
if (ta > ta1)
{
return(r2);
}
else
{
return(r1);
}
}
/// <summary>
///
/// </summary>
/// <param name="point1"></param>
/// <param name="point2"></param>
/// <param name="distance">到Point1的距离</param>
/// <param name="angle">到Point2的角度</param>
/// <returns></returns>
public static List <PointCoordinate> CalcuateCoordinate(PointCoordinate point1, PointCoordinate point2,
double distance, double angle)
{
//根据算法描述，Point1为D点，Point2为A点，未知点为B点
List <PointCoordinate> points = new List <PointCoordinate>();
double b = CalculateDistance(point1, point2) / R; //先计算出两点距离
double crs12 = CalculateAngle(point2, point1); //求出两点的方位角
double crs_AB = ConvertToARC(ConvertToDeg(angle));
double crs_AD = ConvertToARC(ConvertToDeg(crs12));
//A点的夹角
double A = (crs_AD - crs_AB + Math.PI) % (Math.PI * 2) - Math.PI;
double r = Math.Sqrt((Math.Cos(b) * Math.Cos(b) + Math.Sin(b) * Math.Sin(b) * Math.Cos(A) * Math.Cos(A)));
double p = Math.Atan2(Math.Sin(b) * Math.Cos(A), Math.Cos(b));
double d = distance / R;
if (Math.Cos(d) * Math.Cos(d) > r * r)
{
// points.Add(CalcuateCoordinate(point2, angle, p * R));
throw new Exception("要计算的点不存在");
}
else
{
double dp = p + Math.Acos(Math.Cos(d) / r);
if (dp > 0)
{
points.Add(CalcuateCoordinate(point2, angle, dp * R));
}
dp = p - Math.Acos(Math.Cos(d) / r);
if (dp > 0)
{
points.Add(CalcuateCoordinate(point2, angle, dp * R));
}
}
//foreach (PointCoordinate pp in points)
//{
// double kkk = CalculateDistance(pp, point1);
// double aaa = CalculateAngle(point2, pp);
//}
if (points.Count == 0)
{
throw new Exception("要计算的点不存在!");
}
return(points);
/*
*
* Let points A and B define a great circle route and D be a third point. Find the points on the great circle through A and B that lie a distance d from D, if they exist.
*
* A = crs_AD - crs_AB
*
* ( crs_AB and crs_AD are the initial GC bearings from A to B and D, respectively. Compute using Course between points)
*
* b = dist_AD
*
* (dist_AD is the distance from A to D. Compute using Distance between points)
*
* r=(cos(b)^2+sin(b)^2*cos(A)^2)^(1/2)
*
* (acos(r) is the XTD)
*
* p=atan2(sin(b)*cos(A),cos(b))
*
* (p is the ATD)
*
* IF (cos(d)^2 > r^2) THEN
* No points exist
* ELSE
* Two points exist
* dp = p +- acos(cos(d)/r)
* ENDIF
*
* dp are the distances of the desired points from A along AB. Their lat/lons can be computed using Lat/lon given radial and distance
*/
}