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