25 lines
614 B
Python
25 lines
614 B
Python
"""
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One Dot Per Zipcode
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-----------------------
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This example shows a geographical plot with one dot per zipcode.
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"""
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# category: case studies
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import altair as alt
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from vega_datasets import data
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# Since the data is more than 5,000 rows we'll import it from a URL
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source = data.zipcodes.url
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alt.Chart(source).transform_calculate(
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"leading digit", alt.expr.substring(alt.datum.zip_code, 0, 1)
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).mark_circle(size=3).encode(
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longitude='longitude:Q',
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latitude='latitude:Q',
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color='leading digit:N',
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tooltip='zip_code:N'
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).project(
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type='albersUsa'
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).properties(
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width=650,
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height=400
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)
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