Add height to pressure conversion #419
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dopplershift
requested changes
May 8, 2017
metpy/calc/basic.py
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| def height_to_pressure_std(height): | ||
| r"""Convert height data to pressures using the U.S. standard atmosphere. | ||
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| The implementation uses the formula outlined in [Hobbs1977]_ pg.60-61. |
metpy/calc/basic.py
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| t0 = 288. * units.kelvin | ||
| gamma = 6.5 * units('K/km') | ||
| p0 = 1013.25 * units.mbar | ||
| return p0 * np.exp((g / (Rd * gamma)) * np.log(1 - (height * gamma / t0))) |
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return p0 * (1 - (gamma / t0) * height) ** (g / (Rd * gamma))
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Rebasing - then we're good to go |
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dopplershift
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May 8, 2017
dopplershift
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Area: Calc
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We had the other way (pressure to height), but this will be useful when drawing scale bars, coloring things based on their height, etc. The equations smells like it could maybe be slightly simplified, but I haven't seen a way to do it that results in any fewer operations, just moves the logarithm around. Closes #407