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use crate::sounding::DataRow;
use metfor::{CelsiusDiff, CelsiusPKm, HectoPascal, Km, Meters, MetersPSec, Quantity, WindUV};
#[derive(Debug, Clone, Copy)]
pub struct Layer {
pub bottom: DataRow,
pub top: DataRow,
}
pub type Layers = Vec<Layer>;
impl Layer {
pub fn lapse_rate(&self) -> Option<CelsiusPKm> {
let top_t = self.top.temperature.into_option()?;
let bottom_t = self.bottom.temperature.into_option()?;
let dt = CelsiusDiff::from(top_t - bottom_t).unpack();
let dz = Km::from(self.height_thickness()?).unpack();
Some(CelsiusPKm(dt / dz))
}
pub fn height_thickness(&self) -> Option<Meters> {
let top = self.top.height.into_option()?;
let bottom = self.bottom.height.into_option()?;
if top == bottom {
None
} else {
Some(top - bottom)
}
}
pub fn pressure_thickness(&self) -> Option<HectoPascal> {
let bottom_p = self.bottom.pressure.into_option()?;
let top_p = self.top.pressure.into_option()?;
if bottom_p == top_p {
None
} else {
Some(bottom_p - top_p)
}
}
pub fn wind_shear(&self) -> Option<WindUV<MetersPSec>> {
let top = WindUV::from(self.top.wind.into_option()?);
let bottom = WindUV::from(self.bottom.wind.into_option()?);
Some(top - bottom)
}
}
#[cfg(test)]
mod layer_tests {
use super::*;
use crate::sounding::DataRow;
use metfor::*;
use optional::some;
fn make_test_layer() -> Layer {
let mut bottom = DataRow::default();
bottom.pressure = some(HectoPascal(1000.0));
bottom.temperature = some(Celsius(20.0));
bottom.height = some(Meters(5.0));
bottom.wind = some(WindSpdDir::<Knots> {
speed: Knots(1.0),
direction: 180.0,
});
let mut top = DataRow::default();
top.pressure = some(HectoPascal(700.0));
top.temperature = some(Celsius(-2.0));
top.height = some(Meters(3012.0));
top.wind = some(WindSpdDir::<Knots> {
speed: Knots(1.0),
direction: 90.0,
});
Layer { bottom, top }
}
fn approx_eq(a: f64, b: f64, tol: f64) -> bool {
(a - b).abs() <= tol
}
#[test]
fn test_height_thickness() {
let lyr = make_test_layer();
println!("{:#?}", lyr);
assert!(lyr
.height_thickness()
.unwrap()
.approx_eq(Meters(3007.0), Meters(std::f64::EPSILON)));
}
#[test]
fn test_pressure_thickness() {
let lyr = make_test_layer();
println!("{:#?}", lyr);
assert!(lyr
.pressure_thickness()
.unwrap()
.approx_eq(HectoPascal(300.0), HectoPascal(std::f64::EPSILON)));
}
#[test]
fn test_lapse_rate() {
let lyr = make_test_layer();
println!(
"{:#?}\n\n -- \n\n Lapse Rate = {:#?} \n\n --",
lyr,
lyr.lapse_rate().unwrap()
);
assert!(lyr
.lapse_rate()
.unwrap()
.approx_eq(CelsiusPKm(-7.31626), CelsiusPKm(1.0e-5)));
}
#[test]
fn test_wind_shear() {
let lyr = make_test_layer();
println!(
"{:#?}\n\n -- \n\n {:#?} \n\n --",
lyr,
lyr.wind_shear().unwrap()
);
let shear = WindSpdDir::<Knots>::from(lyr.wind_shear().unwrap());
let speed_shear = shear.abs();
let WindSpdDir {
direction: direction_shear,
..
} = shear;
assert!(speed_shear.approx_eq(Knots(::std::f64::consts::SQRT_2), Knots(1.0e-5)));
assert!(approx_eq(direction_shear, 45.0, 1.0e-5));
}
}
mod temperature_layers;
pub use temperature_layers::{
cold_surface_temperature_layer, dendritic_snow_zone, hail_growth_zone,
melting_freezing_energy_area, warm_surface_temperature_layer, warm_temperature_layer_aloft,
warm_wet_bulb_layer_aloft,
};
mod height_pressure;
pub use height_pressure::{layer_agl, pressure_layer};
mod inversions;
pub use inversions::{inversions, sfc_based_inversion};
mod convective;
pub use convective::effective_inflow_layer;