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"""
Global Deaths from Natural Disasters
------------------------------------
This example shows a proportional symbols visualization of deaths from natural disasters by year and type.
"""
# category: case studies
import altair as alt
from vega_datasets import data
source = data.disasters.url
alt.Chart(source).transform_filter(
alt.datum.Entity != 'All natural disasters'
).mark_circle(
opacity=0.8,
stroke='black',
strokeWidth=1,
strokeOpacity=0.4
).encode(
x=alt.X('Year:T', title=None, scale=alt.Scale(domain=['1899','2018'])),
y=alt.Y(
'Entity:N',
sort=alt.EncodingSortField(field="Deaths", op="sum", order='descending'),
title=None
),
size=alt.Size('Deaths:Q',
scale=alt.Scale(range=[0, 2500]),
legend=alt.Legend(title='Deaths', clipHeight=30, format='s')
),
color=alt.Color('Entity:N', legend=None),
tooltip=[
"Entity:N",
alt.Tooltip("Year:T", format='%Y'),
alt.Tooltip("Deaths:Q", format='~s')
],
).properties(
width=450,
height=320,
title=alt.Title(
text="Global Deaths from Natural Disasters (1900-2017)",
subtitle="The size of the bubble represents the total death count per year, by type of disaster",
anchor='start'
)
).configure_axisY(
domain=False,
ticks=False,
offset=10
).configure_axisX(
grid=False,
).configure_view(
stroke=None
)
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