Note
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Modify a Colorbar for your Plot#
This is an example of how to modify a colobar within a Py-ART display object.
print(__doc__)
# Author: Joe O'Brien (obrienj@anl.gov)
# License: BSD 3 clause
import cartopy.crs as ccrs
import matplotlib.pyplot as plt
import pyart
from pyart.testing import get_test_data
** Initial PPI Map Display
Let’s plot a PPI Map Display and take a look at the colorbar
Notice: the colorbar is not perfect and slightly overlaps the PPI display
# Define figure
fig = plt.figure()
# Create a subplot with correct cartopy projection
axs = plt.subplot(111, projection=ccrs.PlateCarree())
# Define and Read in the test data
radar_file = get_test_data("swx_20120520_0641.nc")
radar = pyart.io.read(radar_file)
# Create the Radar Map Display (defines x,y as lat/lons)
display = pyart.graph.RadarMapDisplay(radar)
# Display the horizontal equivalent reflectivity factor
# Note: embellish = False will remove initial lat/lon coords
display.plot_ppi_map(
"reflectivity_horizontal",
2,
ax=axs,
vmin=-30,
vmax=60,
embellish=False,
norm=None,
cmap="pyart_HomeyerRainbow",
)
# Add gridlines
gl = axs.gridlines(
crs=ccrs.PlateCarree(),
draw_labels=True,
linewidth=1,
color="gray",
alpha=0.3,
linestyle="--",
)
plt.gca().xaxis.set_major_locator(plt.NullLocator())
# Make sure labels are only plotted on the left and bottom
gl.top_labels = False
gl.right_labels = False
gl.xlabel_style = {"size": 14}
gl.ylabel_style = {"size": 14}
# delete the display object
del display
** Colorbar Position / Title Manipulation
# Now, let's update the colorbar position
# to match the display
# Define figure
fig = plt.figure()
# Create a subplot with correct cartopy projection
axsB = plt.subplot(111, projection=ccrs.PlateCarree())
# Create the Radar Map Display (defines x,y as lat/lons)
display = pyart.graph.RadarMapDisplay(radar)
# Create the display again
ppi_map = display.plot_ppi_map(
"reflectivity_horizontal",
2,
ax=axsB,
vmin=-30,
vmax=60,
embellish=False,
norm=None,
cmap="pyart_HomeyerRainbow",
)
# Add gridlines
gl = axsB.gridlines(
crs=ccrs.PlateCarree(),
draw_labels=True,
linewidth=1,
color="gray",
alpha=0.3,
linestyle="--",
)
plt.gca().xaxis.set_major_locator(plt.NullLocator())
# Make sure labels are only plotted on the left and bottom
gl.top_labels = False
gl.right_labels = False
# Define the size of the grid labels
gl.xlabel_style = {"size": 12}
gl.ylabel_style = {"size": 12}
# Define the colorbar from the RadarMapDisplay object
cbar = display.cbs[0]
# Modify the colorbar label and size
cbar.set_label(label="Horizontal Reflectivity Factor ($Z_{H}$) (dBZ)", fontsize=12)
# Modify the number of colorbar ticks
cbar.set_ticks([-20, 0, 20, 40, 60])
Total running time of the script: (0 minutes 3.129 seconds)