Dealias doppler velocities using the Region Based Algorithm#

In this example doppler velocities are dealiased using the ial condition of the dealiasing, using the region-based dealiasing algorithm in Py-ART.

Velocity dealiasing using Py-ART, Raw Doppler Velocity, First Sweep, Corrected Doppler Velocity, First Sweep, Raw Doppler Velocity, Sixth Sweep, Corrected Doppler Velocity, Sixth Sweep

# Author: Jonathan J. Helmus (
# License: BSD 3 clause

import matplotlib.pyplot as plt
import pyart
from pyart.testing import get_test_data

radar_file = get_test_data('095636.mdv')
sonde_file = get_test_data('sgpinterpolatedsondeC1.c1.20110510.000000.cdf')

# read in the data
radar =

# read in sonde data
dt, profile =, radar=radar)

# create a gate filter which specifies gates to exclude from dealiasing
gatefilter = pyart.filters.GateFilter(radar)
gatefilter.exclude_outside('reflectivity', 0, 80)

# perform dealiasing
dealias_data = pyart.correct.dealias_region_based(
    radar, gatefilter=gatefilter)
radar.add_field('corrected_velocity', dealias_data)

# create a plot of the first and sixth sweeps
fig = plt.figure(figsize=(15, 10))
ax1 = fig.add_subplot(221)
display = pyart.graph.RadarDisplay(radar)
display.plot('velocity', 0, vmin=-16, vmax=16, ax=ax1,
             colorbar_label='', title='Raw Doppler Velocity, First Sweep')

ax2 = fig.add_subplot(222)
display.plot('corrected_velocity', 0, vmin=-40, vmax=40,
             colorbar_label='', ax=ax2,
             title='Corrected Doppler Velocity, First Sweep')

ax3 = fig.add_subplot(223)
display = pyart.graph.RadarDisplay(radar)
display.plot('velocity', 5, vmin=-16, vmax=16,
             colorbar_label='', ax=ax3,
             title='Raw Doppler Velocity, Sixth Sweep')

ax4 = fig.add_subplot(224)
display.plot_ppi('corrected_velocity', 5, vmin=-40, vmax=40,
                 colorbar_label='', ax=ax4,
                 title='Corrected Doppler Velocity, Sixth Sweep')
plt.suptitle('Velocity dealiasing using Py-ART', fontsize=16)

Total running time of the script: ( 1 minutes 16.185 seconds)

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