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"""
Point map
=========
This is a layered map that shows the positions of airports on a background of U.S. states.
"""
# category: maps
import altair as alt
from vega_datasets import data
# Read in points
airports = data.airports()
# Read in polygons from topojson
states = alt.topo_feature(data.us_10m.url, feature='states')
# US states background
background = alt.Chart(states).mark_geoshape(
fill='lightgray',
stroke='white'
).properties(
width=500,
height=300
).project('albersUsa')
# airport positions on background
points = alt.Chart(airports).mark_circle(
size=10,
color='steelblue'
).encode(
longitude='longitude:Q',
latitude='latitude:Q',
tooltip=['name', 'city', 'state']
)
background + points
|
