27 lines
709 B
Python
27 lines
709 B
Python
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"""
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World Projections
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-----------------
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This example shows a map of the countries of the world using four available
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geographic projections. For more details on the projections available in
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Altair, see https://vega.github.io/vega-lite/docs/projection.html
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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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source = alt.topo_feature(data.world_110m.url, 'countries')
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base = alt.Chart(source).mark_geoshape(
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fill='#666666',
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stroke='white'
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).properties(
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width=300,
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height=180
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)
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projections = ['equirectangular', 'mercator', 'orthographic', 'gnomonic']
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charts = [base.project(proj).properties(title=proj)
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for proj in projections]
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alt.concat(*charts, columns=2)
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