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54 lines
1.8 KiB
Python
54 lines
1.8 KiB
Python
from typing import Any
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import numpy as np
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from enum import Enum
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from ambiance import Atmosphere
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class PressUnit:
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Pa = 0
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hPa = 1
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class AltitudeModel:
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def __init__(self, press_b: float = 1013.25, alt_b: float = 0, unit: PressUnit = PressUnit.hPa):
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"""A simple model for estimating the altitude based on pressure measurements.
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A reference height and the corresponding pressure value can be provided for a more precise model.
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Args:
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press_b (float, optional): The pressure measured at the reference altitude. Defaults to 1013.25 hPa.
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alt_b (float, optional): The reference altitude in meters. Defaults to 0m.
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unit (PressUnit, optional): The unit used for all pressure values. Defaults to PressUnit.hPa.
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"""
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self.__press_0 = press_b / (1 - (alt_b / 44330)**5.255)
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def predict(self, press: float, unit: PressUnit = PressUnit.hPa) -> float:
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"""Estimates the altitude based on a pressure measurement.
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Based on the formulas provided here:
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https://cdn-shop.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf
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Args:
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press (float): The pressure measurement.
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unit (PressUnit, optional): The unit of the pressure measurement. Defaults to PressUnit.hPa.
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Returns:
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float: Returns the estimated altitude in meters.
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"""
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if unit != PressUnit.hPa:
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to_hpa = {
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PressUnit.Pa: press / 1e2
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}
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press = to_hpa[unit]
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return 44330 * (1 - (press / self.__press_0)**(1 / 5.255))
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class StandardAtmosphere:
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def __init__(self) -> None:
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pass
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def predict(self, press: float, unit: PressUnit = PressUnit.Pa) -> float:
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return Atmosphere.from_pressure(press).h[0]
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