texas.py

A color-mapped map plot based on unemployment rate data. This example demonstrates using a LogColorMapper and hover tool.

Details

Sampledata

bokeh.sampledata.unemployment, bokeh.sampledata.us_counties

Bokeh APIs

Figure.patches, bokeh.models.LogColorMapper

More info

Configuring plot tools > HoverTool

Keywords

colormap, map, patches

from bokeh.io import show
from bokeh.models import LogColorMapper
from bokeh.palettes import Viridis6 as palette
from bokeh.plotting import figure
from bokeh.sampledata.unemployment import data as unemployment
from bokeh.sampledata.us_counties import data as counties

palette = tuple(reversed(palette))

counties = {
    code: county for code, county in counties.items() if county["state"] == "tx"
}

county_xs = [county["lons"] for county in counties.values()]
county_ys = [county["lats"] for county in counties.values()]

county_names = [county['name'] for county in counties.values()]
county_rates = [unemployment[county_id] for county_id in counties]
color_mapper = LogColorMapper(palette=palette)

data=dict(
    x=county_xs,
    y=county_ys,
    name=county_names,
    rate=county_rates,
)

TOOLS = "pan,wheel_zoom,reset,hover,save"

p = figure(
    title="Texas Unemployment, 2009", tools=TOOLS,
    x_axis_location=None, y_axis_location=None,
    tooltips=[
        ("Name", "@name"), ("Unemployment rate", "@rate%"), ("(Long, Lat)", "($x, $y)")
    ])
p.grid.grid_line_color = None
p.hover.point_policy = "follow_mouse"

p.patches('x', 'y', source=data,
          fill_color={'field': 'rate', 'transform': color_mapper},
          fill_alpha=0.7, line_color="white", line_width=0.5)

show(p)