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use crate::{
error::{AnalysisError, Result},
interpolation::linear_interpolate_sounding,
sounding::Sounding,
};
use itertools::{izip, Itertools};
use metfor::{mixing_ratio, Celsius, HectoPascal, Meters, Mm, Quantity};
#[inline]
pub fn precipitable_water(snd: &Sounding) -> Result<Mm> {
let p_profile = snd.pressure_profile();
let dp_profile = snd.dew_point_profile();
let integrated_mw = izip!(p_profile, dp_profile)
.filter(|(p, dp)| p.is_some() && dp.is_some())
.map(|(p, dp)| (p.unpack(), dp.unpack()))
.filter_map(|(p, dp)| mixing_ratio(dp, p).map(|mw| (p, mw)))
.tuple_windows::<(_, _)>()
.fold(0.0, |mut acc_mw, ((p0, mw0), (p1, mw1))| {
let dp = p0 - p1;
acc_mw += (mw0 + mw1) * dp.unpack();
acc_mw
});
Ok(Mm(integrated_mw / 9.81 / 997.0 * 100_000.0 / 2.0))
}
#[inline]
pub fn haines(snd: &Sounding) -> Result<u8> {
snd.station_info()
.elevation()
.into_option()
.ok_or(AnalysisError::MissingValue)
.and_then(|elev| {
if elev <= Meters(304.8) {
haines_low(snd)
} else if elev <= Meters(914.4) {
haines_mid(snd)
} else {
haines_high(snd)
}
})
}
#[inline]
pub fn haines_low(snd: &Sounding) -> Result<u8> {
let level1 = linear_interpolate_sounding(snd, HectoPascal(950.0))
.map_err(|_| AnalysisError::MissingValue)?;
let level2 = linear_interpolate_sounding(snd, HectoPascal(850.0))
.map_err(|_| AnalysisError::MissingValue)?;
let Celsius(t_low) = level1.temperature.ok_or(AnalysisError::MissingValue)?;
let Celsius(t_hi) = level2.temperature.ok_or(AnalysisError::MissingValue)?;
let Celsius(dp_hi) = level2.dew_point.ok_or(AnalysisError::MissingValue)?;
let stability_term = (t_low - t_hi).round();
let stability_term = if stability_term >= 8.0 {
3
} else if stability_term > 3.0 {
2
} else {
1
};
let moisture_term = (t_hi - dp_hi).round();
let moisture_term = if moisture_term >= 10.0 {
3
} else if moisture_term > 5.0 {
2
} else {
1
};
Ok(stability_term + moisture_term)
}
#[inline]
pub fn haines_mid(snd: &Sounding) -> Result<u8> {
let level1 = linear_interpolate_sounding(snd, HectoPascal(850.0))
.map_err(|_| AnalysisError::MissingValue)?;
let level2 = linear_interpolate_sounding(snd, HectoPascal(700.0))
.map_err(|_| AnalysisError::MissingValue)?;
let Celsius(t_low) = level1.temperature.ok_or(AnalysisError::MissingValue)?;
let Celsius(t_hi) = level2.temperature.ok_or(AnalysisError::MissingValue)?;
let Celsius(dp_low) = level1.dew_point.ok_or(AnalysisError::MissingValue)?;
let stability_term = (t_low - t_hi).round();
let stability_term = if stability_term >= 11.0 {
3
} else if stability_term > 5.0 {
2
} else {
1
};
let moisture_term = (t_low - dp_low).round();
let moisture_term = if moisture_term >= 13.0 {
3
} else if moisture_term > 5.0 {
2
} else {
1
};
Ok(stability_term + moisture_term)
}
#[inline]
pub fn haines_high(snd: &Sounding) -> Result<u8> {
let level1 = linear_interpolate_sounding(snd, HectoPascal(700.0))
.map_err(|_| AnalysisError::MissingValue)?;
let level2 = linear_interpolate_sounding(snd, HectoPascal(500.0))
.map_err(|_| AnalysisError::MissingValue)?;
let Celsius(t_low) = level1.temperature.ok_or(AnalysisError::MissingValue)?;
let Celsius(t_hi) = level2.temperature.ok_or(AnalysisError::MissingValue)?;
let Celsius(dp_low) = level1.dew_point.ok_or(AnalysisError::MissingValue)?;
let stability_term = (t_low - t_hi).round();
let stability_term = if stability_term >= 22.0 {
3
} else if stability_term > 17.0 {
2
} else {
1
};
let moisture_term = (t_low - dp_low).round();
let moisture_term = if moisture_term >= 21.0 {
3
} else if moisture_term > 14.0 {
2
} else {
1
};
Ok(stability_term + moisture_term)
}