如何解决如何使用初始点,距离和方位角计算端点?
我需要使用起点,距离和方位角找到终点。这是每个值:
latitude: 37.624942,longitude": -7.896333,azimute: 233.0
distance : 20.0
这是我的功能:
private List<double> findEndPoint(string latitudeStart,string longitudeStart,string azimute,double distancia)
{
List<double> endPoint = new List<double>();
double latitudeStartDouble = Convert.ToDouble(latitudeStart,System.Globalization.CultureInfo.InvariantCulture);
double longitudeStartDouble = Convert.ToDouble(longitudeStart,System.Globalization.CultureInfo.InvariantCulture);
double azimuteDouble = Convert.ToDouble(azimute,System.Globalization.CultureInfo.InvariantCulture);
double azimuteRadians = ConvertToRadians(azimuteDouble);
double R = 6371.0; // Raio da Terra em km
double latitudeEnd = Math.Asin(Math.Sin(latitudeStartDouble) * Math.Cos(distancia / R) +
Math.Cos(latitudeStartDouble) * Math.Sin(distancia / R) * Math.Cos(azimuteRadians));
endPoint.Add(latitudeEnd);
double longitudeEnd = longitudeStartDouble + Math.Atan2(
Math.Sin(azimuteRadians) * Math.Sin(distancia / R) * Math.Cos(latitudeStartDouble),Math.Cos(distancia / R) - Math.Sin(latitudeStartDouble) * Math.Sin(latitudeEnd));
endPoint.Add(longitudeEnd);
return endPoint;
}
它返回:
latitude: -0.0760588400705975
longitude:-7.8988473639987093
纬度一定是错误的,但我不知道为什么会赋予我这种价值。
解决方法
您忘记添加cooldows = {"JohnSmith#1234": 1597786825}
。您只需计算增量。所以latitudeStartDouble
我需要使用弧度,然后将其转换回度:
private List<double> findEndPoint(string latitudeStart,string longitudeStart,string azimute,double distancia)
{
List<double> endPoint = new List<double>();
double latitudeStartDouble = Convert.ToDouble(latitudeStart,System.Globalization.CultureInfo.InvariantCulture);
latitudeStartDouble = ConvertToRadians(latitudeStartDouble);
double longitudeStartDouble = Convert.ToDouble(longitudeStart,System.Globalization.CultureInfo.InvariantCulture);
longitudeStartDouble = ConvertToRadians(longitudeStartDouble);
double azimuteDouble = Convert.ToDouble(azimute,System.Globalization.CultureInfo.InvariantCulture);
double azimuteRadians = ConvertToRadians(azimuteDouble);
double R = 6371; // Raio da Terra em km
double latitudeEnd = Math.Asin(Math.Sin(latitudeStartDouble) * Math.Cos(distancia / R) +
Math.Cos(latitudeStartDouble) * Math.Sin(distancia / R) * Math.Cos(azimuteRadians));
latitudeEnd = ConvertToDegrees(latitudeEnd);
endPoint.Add(latitudeEnd);
double longitudeEnd = longitudeStartDouble + Math.Atan2(Math.Sin(azimuteRadians) * Math.Sin(distancia / R) * Math.Cos(latitudeStartDouble),Math.Cos(distancia / R) - Math.Sin(latitudeStartDouble) * Math.Sin(latitudeEnd));
longitudeEnd = ConvertToDegrees(longitudeEnd);
endPoint.Add(longitudeEnd);
return endPoint;
}
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