/// <summary>
/// Calculates the relative humidity (RH) for the given ambient temperature and dew/frost point.
/// </summary>
/// <param name="temperature">The ambient temperature.</param>
/// <param name="dewPoint">The dewpoint or frostpoint temperature.</param>
/// <param name="formula">The folmula to use for calculation.</param>
/// <returns>The relative humidity in range from 0% to 100%.</returns>
public static double CalculateRelativeHumidity(double temperature, double dewPoint,
RelativeHumidityFormula formula = RelativeHumidityFormula.WMO)
{
switch (formula)
{
case RelativeHumidityFormula.Rough:
return(CalculateRelativeHumidityRough(temperature, dewPoint));
case RelativeHumidityFormula.Nasa:
return(dewPoint >= 0
? CalculateRelativeHumidityNasaOverWater(temperature, dewPoint)
: CalculateRelativeHumidityNasaOverIce(temperature, dewPoint));
case RelativeHumidityFormula.NasaOverWater:
return(CalculateRelativeHumidityNasaOverWater(temperature, dewPoint));
case RelativeHumidityFormula.NasaOverIce:
return(CalculateRelativeHumidityNasaOverIce(temperature, dewPoint));
case RelativeHumidityFormula.WMO:
return(dewPoint >= -60
? CalculateRelativeHumidityWMOOverWater(temperature, dewPoint)
: CalculateRelativeHumidityWMOOverIce(temperature, dewPoint));
case RelativeHumidityFormula.WMOOverWater:
return(CalculateRelativeHumidityWMOOverWater(temperature, dewPoint));
case RelativeHumidityFormula.WMOOverIce:
return(CalculateRelativeHumidityWMOOverIce(temperature, dewPoint));
default:
throw new ArgumentOutOfRangeException(nameof(formula), formula, null);
}
}
public void Mixed(double t, double d, double expectedRh, double accuracy, RelativeHumidityFormula formula)
{
var rh = HumidityCalculator.CalculateRelativeHumidity(t, d, formula);
var min = Math.Max(expectedRh * (1 - accuracy), 0);
var max = Math.Min(expectedRh * (1 + accuracy), 100);
Assert.InRange(rh, min, max);
}
/// <summary>
/// Calculates the relative humidity (RH) from the METAR report.
/// </summary>
/// <param name="metar">The metar report.</param>
/// <param name="formula">The folmula to use for calculation.</param>
/// <returns>The relative humidity in range from 0% to 100%.</returns>
public static double CalculateRelativeHumidity(this Metar metar,
RelativeHumidityFormula formula = RelativeHumidityFormula.WMO)
{
return(CalculateRelativeHumidity(metar.Temperature, metar.DewPoint, formula));
}