Choose a CVD Colormap for your Plot

This is an example of some of the CVD friendly colormaps in cmweather, and how to add them to your own plots.

print(__doc__)

# Author: Max Grover and Zach Sherman
# License: BSD 3 clause

import matplotlib
import matplotlib.pyplot as plt
import numpy as np

import cmweather  # noqa

matplotlib.rcParams.update({'font.family': 'Arial'})

Plot the available colormaps

Let’s see which CVD colormaps are available directly from cmweather! We use a helper function from matplotlib to plot this.

# Setup some helper functions and ranges to visualize our colormaps, from matplotlib
gradient = np.linspace(0, 1, 256)
gradient = np.vstack((gradient, gradient))


def plot_color_gradients(cmap_category, cmap_list):
    # Create figure and adjust figure height to number of colormaps
    nrows = len(cmap_list)
    figh = 0.35 + 0.15 + (nrows + (nrows - 1) * 0.1) * 0.22
    fig, axs = plt.subplots(nrows=nrows, figsize=(6.4, figh))
    fig.subplots_adjust(top=1 - 0.35 / figh, bottom=0.15 / figh, left=0.4, right=0.99)

    axs[0].set_title(cmap_category, fontsize=14)

    for ax, cmap_name in zip(axs, cmap_list):
        ax.imshow(gradient, aspect='auto', cmap=f"{cmap_name}")
        if cmap_name == 'plasmidis':
            ax.text(
                -0.01,
                0.5,
                f"{'plasmidis'}",
                va='center',
                ha='right',
                fontsize=10,
                transform=ax.transAxes,
            )
        else:
            ax.text(
                -0.01,
                0.5,
                f"{cmap_name}",
                va='center',
                ha='right',
                fontsize=10,
                transform=ax.transAxes,
            )

    # Turn off *all* ticks & spines, not just the ones with colormaps.
    for ax in axs:
        ax.set_axis_off()

Color Vision Deficiency (CVD) Friendly Colormaps

We recommend starting with these CVD friendly colormaps. These colormaps are the most inclusive, and should be used where possible.

Reflectivity Colormaps

These CVD colormaps were created for equivalent reflectivity factor.

(r'$H_{2}$')
plot_color_gradients(
    r'CVD-Friendly $Z_{e}$ Colormaps',
    ['LangRainbow12', 'HomeyerRainbow', 'ChaseSpectral', 'SpectralExtended'],
)

Velocity Colormaps

These CVD colormaps were created for mean Doppler velocity.

plot_color_gradients('CVD-Friendly Velocity Colormaps', ['balance', 'twilight_shifted'])

Polarization Colormaps

These CVD colormaps were created for polarization moments such as differential reflectivity and depolarization ratio.

plot_color_gradients('CVD-Friendly Polarization Colormaps', ['CM_depol', 'plasmidis'])