Add altimeter and sea level pressure calculations from station pressure - #4118
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fronzi wants to merge 1 commit into
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Add altimeter and sea level pressure calculations from station pressure#4118fronzi wants to merge 1 commit into
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…on_pressure Adds the analytic inverse of altimeter_to_station_pressure and exposes the hypsometric reduction from station pressure to sea-level pressure. Fixes Unidata#3369
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Thanks for picking this up. Working through the CLA now. Happy to rename the two functions if these don't match the convention you'd prefer. |
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Fixes #3369.
Adds two functions to
metpy.calc.basic:altimeter_from_station_pressure— the analytic inverse ofaltimeter_to_station_pressure, obtained by solving Equations 1 and 3 of the Smithsonian Handbook (1951) p. 269 for the altimeter setting rather than the station pressure.sea_level_pressure_from_station_pressure— exposes the hypsometric reduction thataltimeter_to_sea_level_pressurealready performs internally, for users who have station pressure rather than an altimeter setting.Verification:
altimeter_to_station_pressureagrees to ~1e-13 hPa, tested across numpy, masked, dask and xarray inputs via thearray_typefixture.sea_level_pressure_from_station_pressurecomposed withaltimeter_to_station_pressurereproducesaltimeter_to_sea_level_pressureto 8 decimals.Six tests added, plus entries in the Standard Atmosphere section of the docs.
Happy to rename either function if these don't fit the X_from_Y convention you'd prefer.