May be useful to align the colorbar intervals with intuitive intervals such as freezing, room, and boiling point temperatures.

#python #dataviz #holoviews #datascience

import xarray as xr
import hvplot.xarray
from bokeh.models import FixedTicker

ds = xr.tutorial.open_dataset('air_temperature')

# uneven color levels / intervals
# absolute 0, cryogenic, freezing, comfortable, boiling, extreme
color_levels = [0, 150, 273.15, 293.15, 373.15, 500]

ds.hvplot("lon", "lat").opts(
    # select colors to create color map
    cmap=["black", "#336699", "#FF8C00", "#B22222", "#8B008B"],
    # set color levels and color bar ticks
    color_levels=color_levels,
    colorbar_opts={"ticker": FixedTicker(ticks=color_levels)},
    # set color bar range based on color levels
    clim=(color_levels[0], color_levels[-1]),
)