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# Copyright (c) 2008-2017 MetPy Developers. |
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# Distributed under the terms of the BSD 3-Clause License. |
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# SPDX-License-Identifier: BSD-3-Clause |
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"""Test the `indices` module.""" |
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from datetime import datetime |
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from metpy.calc import (bulk_shear, bunkers_storm_motion, mean_pressure_weighted, |
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precipitable_water) |
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from metpy.io import get_upper_air_data |
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from metpy.io.upperair import UseSampleData |
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from metpy.testing import assert_almost_equal, assert_array_equal |
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from metpy.units import concatenate, units |
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import numpy as np |
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def test_precipitable_water(): |
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"""Test precipitable water with observed sounding.""" |
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with UseSampleData(): |
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data = get_upper_air_data(datetime(2016, 5, 22, 0), 'DDC', source='wyoming') |
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pw = precipitable_water(data.variables['dewpoint'][:], data.variables['pressure'][:]) |
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truth = (0.8899441949243486 * units('inches')).to('millimeters') |
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assert_array_equal(pw, truth) |
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def test_mean_pressure_weighted(): |
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"""Test pressure-weighted mean wind function with vertical interpolation.""" |
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with UseSampleData(): |
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data = get_upper_air_data(datetime(2016, 5, 22, 0), 'DDC', source='wyoming') |
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u, v = mean_pressure_weighted(data.variables['pressure'][:], |
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data.variables['u_wind'][:], |
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data.variables['v_wind'][:], |
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heights=data.variables['height'][:], |
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depth=6000 * units('meter')) |
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assert_almost_equal(u, 6.0208700094534775 * units('m/s'), 7) |
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assert_almost_equal(v, 7.966031839967931 * units('m/s'), 7) |
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def test_mean_pressure_weighted_elevated(): |
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"""Test pressure-weighted mean wind function with a base above the surface.""" |
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with UseSampleData(): |
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data = get_upper_air_data(datetime(2016, 5, 22, 0), 'DDC', source='wyoming') |
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u, v = mean_pressure_weighted(data.variables['pressure'][:], |
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data.variables['u_wind'][:], |
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data.variables['v_wind'][:], |
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heights=data.variables['height'][:], |
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depth=3000 * units('meter'), |
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bottom=data.variables['height'][0] + 3000 * units('meter')) |
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assert_almost_equal(u, 8.270829843626476 * units('m/s'), 7) |
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assert_almost_equal(v, 1.7392601775853547 * units('m/s'), 7) |
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def test_bunkers_motion(): |
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"""Test Bunkers storm motion with observed sounding.""" |
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with UseSampleData(): |
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data = get_upper_air_data(datetime(2016, 5, 22, 0), 'DDC', source='wyoming') |
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motion = concatenate(bunkers_storm_motion(data.variables['pressure'][:], |
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data.variables['u_wind'][:], data.variables['v_wind'][:], |
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data.variables['height'][:])) |
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truth = [1.4537892577864744, 2.0169333025630616, 10.587950761120482, 13.915130377372801, |
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6.0208700094534775, 7.9660318399679308] * units('m/s') |
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assert_almost_equal(motion.flatten(), truth, 8) |
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def test_bulk_shear(): |
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"""Test bulk shear with observed sounding.""" |
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with UseSampleData(): |
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data = get_upper_air_data(datetime(2016, 5, 22, 0), 'DDC', source='wyoming') |
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u, v, mag = bulk_shear(data.variables['pressure'][:], data.variables['u_wind'][:], |
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data.variables['v_wind'][:], heights=data.variables['height'][:], |
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depth=6000 * units('meter')) |
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truth = [29.899581266946115, -14.389225800205509, 33.181844117951236] * units('knots') |
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assert_almost_equal(u.to('knots'), truth[0], 8) |
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assert_almost_equal(v.to('knots'), truth[1], 8) |
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assert_almost_equal(mag.to('knots'), truth[2], 8) |
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def test_bulk_shear_elevated(): |
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"""Test bulk shear with observed sounding and a base above the surface.""" |
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with UseSampleData(): |
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data = get_upper_air_data(datetime(2016, 5, 22, 0), 'DDC', source='wyoming') |
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u, v, mag = bulk_shear(data.variables['pressure'][:], data.variables['u_wind'][:], |
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data.variables['v_wind'][:], heights=data.variables['height'][:], |
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bottom=data.variables['height'][0] + 3000 * units('meter'), |
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depth=3000 * units('meter'),) |
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truth = [0.9655943923302139, -3.8405428777944466, 3.9600684497464442] * units('m/s') |
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assert_almost_equal(u, truth[0], 8) |
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assert_almost_equal(v, truth[1], 8) |
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assert_almost_equal(mag, truth[2], 8) |
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Unidata /
MetPy
