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Sonja Cutts's Geographic Visualization Workspace
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SonjaCutts
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Feb 27
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Second Exercise on Observable: Classification and Colors
4
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1
md
`# Second Exercise on Observable: Classification and Colors`
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1
d3
=
require
(
"d3@5"
)
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1
topojson
=
require
(
"topojson-client@3"
)
Insert cell
1
Oregon
=
FileAttachment
(
"Oregon_county_2020_WGS.json"
)
.
json
(
)
Insert cell
1
oregon_features
=
topojson
.
feature
(
Oregon
,
Oregon
.
objects
.
Oregon_county_2020_WGS
)
Insert cell
1
csv_data
=
d3
.
csvParse
(
await
FileAttachment
(
"Hispanic_2020_Oregon_County.csv"
)
.
text
(
)
,
(
{
COUNTYA
,
U7K001
,
U7K003
}
)
=>
(
[
+
COUNTYA
,
100
*
+
U7K003
/
U7K001
]
)
)
Insert cell
1
csv_data_objects
=
Object
.
assign
(
(
d3
.
csvParse
(
await
FileAttachment
(
"Hispanic_2020_Oregon_County.csv"
)
.
text
(
)
,
d3
.
autoType
)
)
.
map
(
(
{
COUNTYA
,
U7K001
,
U7K003
}
)
=>
(
{
COUNTYA
:
+
COUNTYA
,
pctHispanic
:
100
*
+
U7K003
/
U7K001
}
)
)
)
Insert cell
viewof
bins
=
Inputs
.
range
(
[
0
,
20
]
,
{
step
:
1
,
label
:
"Bins"
}
)
Insert cell
1
Plot
.
plot
(
{
marks
:
[
Plot
.
rectY
(
csv_data_objects
,
Plot
.
binX
(
{
y
:
"count"
}
,
{
x
:
"pctHispanic"
,
thresholds
:
bins
}
)
)
,
Plot
.
ruleY
(
[
0
]
)
]
}
)
Insert cell
1
pctHispanic
=
Array
.
from
(
csv_data
.
values
(
)
,
d
=>
d
[
1
]
)
Insert cell
data
=
Object
.
assign
(
new
Map
(
csv_data
)
,
{
title
:
[
"Hispanic or Latino Origin in Oregon Counties"
]
}
)
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md
`# Linear Scale (Unclassed)`
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1
linear
=
d3
.
scaleLinear
(
)
.
domain
(
d3
.
extent
(
pctHispanic
)
)
.
range
(
[
"#deebf7"
,
"#3182bd"
]
)
Insert cell
1
chart
(
numericSort
(
pctHispanic
)
,
linear
)
Insert cell
md
`# Quantile Classification`
Insert cell
1
quantile
=
d3
.
scaleQuantile
(
)
.
domain
(
pctHispanic
)
.
range
(
[
"#e5f5e0"
,
"#a1d99b"
,
"#31a354"
]
)
Insert cell
chart
(
numericSort
(
pctHispanic
)
,
quantile
)
Insert cell
md
`# Jenks Natural Breaks Classification`
Insert cell
1
naturalbreaks
=
simple
.
ckmeans
(
pctHispanic
,
3
)
.
map
(
v
=>
v
.
pop
(
)
)
Insert cell
1
jenks
=
d3
.
scaleThreshold
(
)
.
domain
(
naturalbreaks
)
.
range
(
[
"#efedf5"
,
"#bcbddc"
,
"#756bb1"
]
)
Insert cell
chart
(
numericSort
(
pctHispanic
)
,
jenks
)
Insert cell
md
`# Equal Interval Classification (Quantize)`
Insert cell
1
quantize
=
d3
.
scaleQuantize
(
)
.
domain
(
d3
.
extent
(
pctHispanic
)
)
.
range
(
[
"#fee6ce"
,
"#fdae6b"
,
"#e6550d"
]
)
Insert cell
chart
(
numericSort
(
pctHispanic
)
,
quantize
)
Insert cell
md
`# Threshold`
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1
d3
.
min
(
pctHispanic
)
Insert cell
1
d3
.
max
(
pctHispanic
)
Insert cell
1
threshold
=
d3
.
scaleThreshold
(
)
.
domain
(
[
4
,
35
]
)
.
range
(
[
"#f0f0f0"
,
"#bdbdbd"
,
"#636363"
]
)
Insert cell
chart
(
numericSort
(
pctHispanic
)
,
threshold
)
Insert cell
showScaleGrouping
(
pctHispanic
,
{
scaleQuantile
:
quantile
,
scaleThreshold
:
threshold
,
scaleJenks
:
jenks
,
scaleQuantize
:
quantize
,
scaleQuantizeNice
:
quantize
.
copy
(
)
.
nice
(
)
}
)
Insert cell
md
`# Annex`
Insert cell
Insert cell
Insert cell
simple
=
require
(
"simple-statistics@7.0.7/dist/simple-statistics.min.js"
)
Insert cell
Insert cell
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