This variation of my California population density map uses geo2svg to generate a static choropleth from the command line!
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geo2svg
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| license: gpl-3.0 | |
| height: 1100 | |
| border: no |
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| .DS_Store | |
| node_modules | |
| cb_* |
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| <!DOCTYPE html> | |
| <img src="topo.svg" width="960" height="1100"> |
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| { | |
| "private": true, | |
| "license": "gpl-3.0", | |
| "author": { | |
| "name": "Mike Bostock", | |
| "url": "https://bost.ocks.org/mike" | |
| }, | |
| "scripts": { | |
| "prepublish": "bash prepublish" | |
| }, | |
| "devDependencies": { | |
| "d3-array": "^1.0.1", | |
| "d3-geo-projection": "^1.2.1", | |
| "d3-scale-chromatic": "^1.1.0", | |
| "ndjson-cli": "^0.3.0", | |
| "shapefile": "^0.5.8", | |
| "topojson": "^2.0.0", | |
| "topojson-client": "^2.1.0", | |
| "topojson-simplify": "^2.0.0" | |
| } | |
| } |
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| #!/bin/bash | |
| # EPSG:3310 California Albers | |
| PROJECTION='d3.geoAlbers().parallels([34, 40.5]).rotate([120, 0])' | |
| # The state FIPS code. | |
| STATE=06 | |
| # The ACS 5-Year Estimate vintage. | |
| YEAR=2014 | |
| # The display size. | |
| WIDTH=960 | |
| HEIGHT=1100 | |
| # Download the census block group boundaries. | |
| # Extract the shapefile (.shp) and dBASE (.dbf). | |
| if [ ! -f cb_${YEAR}_${STATE}_bg_500k.shp ]; then | |
| curl -o cb_${YEAR}_${STATE}_bg_500k.zip \ | |
| "http://www2.census.gov/geo/tiger/GENZ${YEAR}/shp/cb_${YEAR}_${STATE}_bg_500k.zip" | |
| unzip -o \ | |
| cb_${YEAR}_${STATE}_bg_500k.zip \ | |
| cb_${YEAR}_${STATE}_bg_500k.shp \ | |
| cb_${YEAR}_${STATE}_bg_500k.dbf | |
| fi | |
| # Download the list of counties. | |
| if [ ! -f cb_${YEAR}_${STATE}_counties.json ]; then | |
| curl -o cb_${YEAR}_${STATE}_counties.json \ | |
| "http://api.census.gov/data/${YEAR}/acs5?get=NAME&for=county:*&in=state:${STATE}&key=${CENSUS_KEY}" | |
| fi | |
| # Download the census block group population estimates for each county. | |
| if [ ! -f cb_${YEAR}_${STATE}_bg_B01003.ndjson ]; then | |
| for COUNTY in $(ndjson-cat cb_${YEAR}_${STATE}_counties.json \ | |
| | ndjson-split \ | |
| | tail -n +2 \ | |
| | ndjson-map 'd[2]' \ | |
| | cut -c 2-4); do | |
| echo ${COUNTY} | |
| if [ ! -f cb_${YEAR}_${STATE}_${COUNTY}_bg_B01003.json ]; then | |
| curl -o cb_${YEAR}_${STATE}_${COUNTY}_bg_B01003.json \ | |
| "http://api.census.gov/data/${YEAR}/acs5?get=B01003_001E&for=block+group:*&in=state:${STATE}+county:${COUNTY}&key=${CENSUS_KEY}" | |
| fi | |
| ndjson-cat cb_${YEAR}_${STATE}_${COUNTY}_bg_B01003.json \ | |
| | ndjson-split \ | |
| | tail -n +2 \ | |
| >> cb_${YEAR}_${STATE}_bg_B01003.ndjson | |
| done | |
| fi | |
| # 1. Convert to GeoJSON. | |
| # 2. Project. | |
| # 3. Join with the census data. | |
| # 4. Compute the population density. | |
| # 5. Simplify. | |
| # 6. Compute the county borders. | |
| geo2topo -n \ | |
| blockgroups=<(ndjson-join 'd.id' \ | |
| <(shp2json cb_${YEAR}_${STATE}_bg_500k.shp \ | |
| | geoproject "${PROJECTION}.fitExtent([[10, 10], [${WIDTH} - 10, ${HEIGHT} - 10]], d)" \ | |
| | ndjson-split 'd.features' \ | |
| | ndjson-map 'd.id = d.properties.GEOID.slice(2), d') \ | |
| <(cat cb_${YEAR}_${STATE}_bg_B01003.ndjson \ | |
| | ndjson-map '{id: d[2] + d[3] + d[4], B01003: +d[0]}') \ | |
| | ndjson-map -r d3=d3-array 'd[0].properties = {density: d3.bisect([1, 10, 50, 200, 500, 1000, 2000, 4000], (d[1].B01003 / d[0].properties.ALAND || 0) * 2589975.2356)}, d[0]') \ | |
| | topomerge -k 'd.id.slice(0, 3)' counties=blockgroups \ | |
| | topomerge --mesh -f 'a !== b' counties=counties \ | |
| | topomerge -k 'd.properties.density' blockgroups=blockgroups \ | |
| | toposimplify -p 1 -f \ | |
| > topo.json | |
| # Convert to SVG (while dropping the last line). | |
| cat \ | |
| <(topo2geo -n \ | |
| < topo.json blockgroups=- \ | |
| | ndjson-map -r d3=d3-scale-chromatic '(d.properties.title = d.id, d.properties.fill = d3.schemeOrRd[9][d.id], d)') \ | |
| <(topo2geo -n \ | |
| < topo.json counties=- \ | |
| | ndjson-map '(d.properties.stroke = "black", d.properties.strokeOpacity = 0.3, d)') \ | |
| | geo2svg --stroke=none -n -p 1 -w ${WIDTH} -h ${HEIGHT} \ | |
| | sed '$d' \ | |
| > topo.svg | |
| # Insert the legend. | |
| tail -n +4 \ | |
| < legend.svg \ | |
| >> topo.svg | |
| rm topo.json |
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