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40 lines
981 B
Python
40 lines
981 B
Python
"""
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Locations of US Airports
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========================
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This is a layered geographic visualization that shows the positions of US
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airports on a background of US states.
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"""
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# category: maps
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import altair as alt
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from vega_datasets import data
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airports = data.airports.url
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states = alt.topo_feature(data.us_10m.url, feature='states')
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# US states background
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background = alt.Chart(states).mark_geoshape(
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fill='lightgray',
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stroke='white'
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).properties(
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width=500,
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height=300
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).project('albersUsa')
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# airport positions on background
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points = alt.Chart(airports).transform_aggregate(
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latitude='mean(latitude)',
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longitude='mean(longitude)',
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count='count()',
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groupby=['state']
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).mark_circle().encode(
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longitude='longitude:Q',
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latitude='latitude:Q',
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size=alt.Size('count:Q', title='Number of Airports'),
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color=alt.value('steelblue'),
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tooltip=['state:N','count:Q']
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).properties(
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title='Number of airports in US'
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)
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background + points
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