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RJ Sheperd
Exploring people, places, and politics.
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Published
By
RJ Sheperd
Edited
May 17, 2020
1
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topojson
=
require
(
"topojson-client@3"
)
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d3
=
require
(
'd3@5'
)
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montana_topojson
=
FileAttachment
(
"montana_census_tracts_topo.json"
)
.
json
(
)
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montana_tracts
=
topojson
.
feature
(
montana_topojson
,
montana_topojson
.
objects
.
montana_census_tracts
)
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projection
=
d3
.
geoMercator
(
)
.
fitSize
(
[
width
,
height
]
,
montana_tracts
)
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min_max
=
{
const
census_vals
=
Object
.
values
(
census_data
)
.
map
(
c
=>
c
.
B01003_001E
)
;
const
min
=
Math
.
min
(
...
census_vals
)
;
const
max
=
Math
.
max
(
...
census_vals
)
;
return
[
min
,
max
]
;
}
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scale
=
d3
.
scalePow
(
)
.
domain
(
min_max
)
.
range
(
[
'#fff5eb'
,
'#7f2704'
]
)
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Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
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topojson
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d3
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montana_topojson
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montana_tracts
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projection
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path
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min_max
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scale
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fill
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height
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state_fips
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census_vars
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census_api
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census_tracts_zip
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census_data
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states
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