Published
Edited
Sep 30, 2020
3 stars
md `
One can make this super advanced. Matthew Bloch has an [example](https://youtu.be/X-CGAS4YaPA?t=958) of how he uses Makefiles with mapshaper:
\`\`\`
map:
mapshaper countyp010.shp name=counties \
-filter 'STATE_FIPS < 72' \
-filter 'COUNTY != ""' \
-dissolve FIPS copy-fields=STATE \
-simplify 2% \
-proj albersusa \
-points inner + name=points \
-i 2012-president-general-counties.csv string-fields=fips name=data \
-filter-fields fips,votes,obama,romney \
-each 'margin = obama - romney' \
-each 'absmargin = Math.abs(margin)' \
-join target=points data keys=FIPS,fips \
-sort absmargin descending \
-svg-style r='Math.sqrt(absmargin) * 0.02' \
-svg-style opacity=0.5 fill='margin > 0 ? "#0061aa" : "#cc0000"' \
-lines STATE target=counties \
-svg-style stroke="#ddd" where='TYPE == "inner"' \
-svg-style stroke="#777" where='TYPE == "outer"' \
-svg-style stroke="#999" where='TYPE == "STATE"' \
-o map.svg target=counties,points
\`\`\`
`
d3 = require('d3')
topojson = require('topojson')
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