.. This document is auto-generated by the altair-gallery extension. Do not modify directly.

.. _gallery_choropleth:


Choropleth Map
==============
A choropleth map of unemployment rate per county in the US


.. altair-plot::
    :code-below:

    
    import altair as alt
    from vega_datasets import data

    counties = alt.topo_feature(data.us_10m.url, 'counties')
    source = data.unemployment.url

    alt.Chart(counties).mark_geoshape().encode(
        color='rate:Q'
    ).transform_lookup(
        lookup='id',
        from_=alt.LookupData(source, 'id', ['rate'])
    ).project(
        type='albersUsa'
    ).properties(
        width=500,
        height=300
    )


.. toctree::
   :hidden: