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Geographic Visualization (GEOG 3540) - University of Iowa
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Published
By
Caglar Koylu
Edited
Feb 18, 2022
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Assignment 1: Percent Population 5 and Younger in Alaska
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Insert cell
md
`# Second Exercise on Observable: Classification and Colors`
Insert cell
d3
=
require
(
"d3@5"
)
Insert cell
topojson
=
require
(
"topojson-client@3"
)
Insert cell
1
Alaska
=
FileAttachment
(
"Alaska.json"
)
.
json
(
)
Insert cell
county_features
=
topojson
.
feature
(
Alaska
,
Alaska
.
objects
.
Alaska
)
Insert cell
csv_data
=
d3
.
csvParse
(
await
FileAttachment
(
"Alaska@1.csv"
)
.
text
(
)
,
(
{
FIPS
,
AGE_UNDER5
,
POP2010
}
)
=>
[
FIPS
,
+
AGE_UNDER5
/
+
POP2010
]
)
Insert cell
csv_data_objects
=
Object
.
assign
(
(
d3
.
csvParse
(
await
FileAttachment
(
"Alaska@1.csv"
)
.
text
(
)
,
d3
.
autoType
)
)
.
map
(
(
{
FIPS
,
AGE_UNDER5
,
POP2010
}
)
=>
(
{
FIPS
:
+
FIPS
,
pctAgeUnder5
:
+
AGE_UNDER5
/
+
POP2010
}
)
)
)
Insert cell
viewof
bins
=
Inputs
.
range
(
[
0
,
20
]
,
{
step
:
1
,
label
:
"Bins"
}
)
Insert cell
Plot
.
plot
(
{
marks
:
[
Plot
.
rectY
(
csv_data_objects
,
Plot
.
binX
(
{
y
:
"count"
}
,
{
x
:
"pctAgeUnder5"
,
thresholds
:
bins
}
)
)
,
Plot
.
ruleY
(
[
0
]
)
]
}
)
Insert cell
childpct
=
Array
.
from
(
csv_data
.
values
(
)
,
d
=>
d
[
1
]
)
Insert cell
data
=
Object
.
assign
(
new
Map
(
csv_data
)
,
{
title
:
[
"Percent Population of Alaska: 5 and Younger"
]
}
)
Insert cell
md
`# Linear Scale (Unclassed)`
Insert cell
linear
=
d3
.
scaleLinear
(
)
.
domain
(
d3
.
extent
(
childpct
)
)
.
range
(
[
"white"
,
"green"
]
)
Insert cell
chart
(
numericSort
(
childpct
)
,
linear
)
Insert cell
md
`# Quantile Classification`
Insert cell
quantile
=
d3
.
scaleQuantile
(
)
.
domain
(
childpct
)
.
range
(
[
"white"
,
"#99d594"
,
"green"
]
)
Insert cell
chart
(
numericSort
(
childpct
)
,
quantile
)
Insert cell
md
`# Jenks Natural Breaks Classification`
Insert cell
naturalbreaks
=
simple
.
ckmeans
(
childpct
,
3
)
.
map
(
v
=>
v
.
pop
(
)
)
Insert cell
jenks
=
d3
.
scaleThreshold
(
)
.
domain
(
naturalbreaks
)
.
range
(
[
"white"
,
"#99d594"
,
"green"
]
)
Insert cell
chart
(
numericSort
(
childpct
)
,
jenks
)
Insert cell
md
`# Equal Interval Classification (Quantize)`
Insert cell
quantize
=
d3
.
scaleQuantize
(
)
.
domain
(
[
d3
.
min
(
childpct
)
,
d3
.
max
(
childpct
)
]
)
.
range
(
[
"#fde0dd"
,
"#fa9fb5"
,
"#c51b8a"
]
)
Insert cell
chart
(
numericSort
(
childpct
)
,
quantize
)
Insert cell
md
`# Threshold`
Insert cell
threshold
=
d3
.
scaleThreshold
(
)
.
domain
(
[
0.05
,
0.1
,
0.2
]
)
.
range
(
[
"white"
,
"#99d594"
,
"green"
]
)
Insert cell
chart
(
numericSort
(
childpct
)
,
threshold
)
Insert cell
showScaleGrouping
(
childpct
,
{
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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chart
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simple
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