/// <summary>
/// 输入一个闪电，判断其对应中心点经纬度 方向|| Get direction of a strike
/// </summary>
/// <param name="_strike"></param>
/// <returns></returns>
private LightningStrikeDirectionEnum JudgeLightningStrikeDirection(LightningStrikeStandard _strike, PointLocation _centerPoint)
{
try
{
LightningStrikeDirectionEnum result = new LightningStrikeDirectionEnum();
double angle = AngleClass.CalcueAngle(_centerPoint.Longitude, _centerPoint.Latitude, _strike.Longitude, _strike.Latitude);
result = AngleClass.GetLightningStrikeDirection(angle);
return(result);
}
catch (Exception ex)
{
throw ex;
}
}
/// <summary>
/// 输入AB向量角度(弧度制)，范围：满足(-pi,pi)。
/// input AB Vector angles in radians; range: (-pi,pi)
/// </summary>
/// <returns></returns>
public static LightningStrikeDirectionEnum GetLightningStrikeDirection(double _angle)
{
try
{
LightningStrikeDirectionEnum result = LightningStrikeDirectionEnum.North;//默认值
if ((_angle >= (-1.0 / 8.0) * Math.PI && _angle < 0) || (_angle >= 0 && _angle < Math.PI * (1.0 / 8.0)))
{
result = LightningStrikeDirectionEnum.East;
}
else if (_angle >= (1.0 / 8.0) * Math.PI && _angle < (3.0 / 8.0) * Math.PI)
{
result = LightningStrikeDirectionEnum.NorthEast;
}
else if (_angle >= (3.0 / 8.0) * Math.PI && _angle < (5.0 / 8.0) * Math.PI)
{
result = LightningStrikeDirectionEnum.North;
}
else if (_angle >= (5.0 / 8.0) * Math.PI && _angle < (7.0 / 8.0) * Math.PI)
{
result = LightningStrikeDirectionEnum.NorthWest;
}
else if ((_angle >= (7.0 / 8.0) * Math.PI && _angle <= Math.PI) || (_angle >= -Math.PI && _angle < (-7.0 / 8.0) * Math.PI))
{
result = LightningStrikeDirectionEnum.West;
}
else if (_angle >= (-7.0 / 8.0) * Math.PI && _angle < (-5.0 / 8.0) * Math.PI)
{
result = LightningStrikeDirectionEnum.SouthWest;
}
else if (_angle >= (-5.0 / 8.0) * Math.PI && _angle < (-3.0 / 8.0) * Math.PI)
{
result = LightningStrikeDirectionEnum.South;
}
else if (_angle >= (-3.0 / 8.0) * Math.PI && _angle < (-1.0 / 8.0) * Math.PI)
{
result = LightningStrikeDirectionEnum.SouthEast;
}
else
{
throw new ArgumentOutOfRangeException("Angle out of range");
}
return(result);
}
catch { throw; }
}
/// <summary>
/// 输入闪电，计算某种方向闪电的概率。概率格式：33.3%|| Calcu property of a lightning
/// </summary>
/// <param name="_strikes"></param>
/// <returns></returns>
private double CalcuLightningStrikeDirectionProbability(IEnumerable <LightningStrikeStandard> _strikes, LightningStrikeDirectionEnum _directionEnum)
{
double result = 0;
int suitedNum = 0;
int TotalNumber = _strikes.Count();
foreach (var tmpStrike in _strikes)
{
if (_directionEnum == JudgeLightningStrikeDirection(tmpStrike, centerPoint))
{
suitedNum++;
}
}
result = Math.Round((double)suitedNum / (double)TotalNumber * 100, 1);
return(result);
}
