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Plot: Election wind map

Observable Plot › Gallery

\n\n# Election wind map\n\nA map where the margin by which the winner of the US presidential election of 2020 won the vote in each county is represented as a non-gridded [wind map](https://observablehq.com/@observablehq/plot-wind-map). The length of the [vector](https://observablehq.com/plot/marks/vector) encodes the difference in votes for the Democratic candidate vs the Republican candidate , with color and direction both showing who won.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":3,"value":"Plot.plot({\n projection: \"albers-usa\",\n length: {type: \"sqrt\", transform: Math.abs},\n marks: [\n Plot.geo(statemesh, {strokeWidth: 0.5}),\n Plot.geo(nation),\n Plot.vector(\n counties,\n Plot.centroid({\n anchor: \"start\",\n length: (d) => d.properties.margin2020 * d.properties.votes,\n stroke: (d) => d.properties.margin2020 > 0 ? \"red\" : \"blue\",\n rotate: (d) => d.properties.margin2020 > 0 ? 60 : -60\n })\n )\n ]\n})","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":10,"value":"counties = {\n const counties = topojson.feature(us, us.objects.counties).features;\n const _election = new Map(election.map((d) => [d.fips, d]));\n counties.forEach(county => {\n county.properties.margin2020 = +_election.get(county.id)?.margin2020;\n county.properties.votes = +_election.get(county.id)?.votes;\n });\n return counties;\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":13,"value":"statemesh = topojson.mesh(us, us.objects.states)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":15,"value":"nation = topojson.feature(us, us.objects.nation)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":18,"value":"election = FileAttachment(\"us-presidential-election-2020.csv\").csv()","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":8,"value":"us = FileAttachment(\"us-counties-10m.json\").json()","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W49","stdlib":"1"}} 24:null 3f:[["$","title","0",{"children":"Plot: Election wind map | Yuichi Yazaki | Observable"}],["$","meta","1",{"property":"og:title","content":"Plot: Election wind map"}],["$","meta","2",{"property":"og:description","content":"An Observable notebook by Yuichi Yazaki"}],["$","meta","3",{"property":"og:url","content":"https://observablehq.com/d/e06aedafe5378113"}],["$","meta","4",{"property":"og:site_name","content":"Observable"}],["$","meta","5",{"property":"og:image","content":"https://static.observableusercontent.com/thumbnail/7f1c1a02ba70215a46f5ec87e18158fdc6ce169d0b5622aad71afdcc29d2a20a.jpg"}],["$","meta","6",{"property":"og:image:width","content":"640"}],["$","meta","7",{"property":"og:image:height","content":"400"}],["$","meta","8",{"property":"og:type","content":"article"}],["$","meta","9",{"name":"twitter:card","content":"summary_large_image"}],["$","meta","10",{"name":"twitter:title","content":"Plot: Election wind map"}],["$","meta","11",{"name":"twitter:description","content":"An Observable notebook by Yuichi Yazaki"}],["$","meta","12",{"name":"twitter:image","content":"https://static.observableusercontent.com/thumbnail/7f1c1a02ba70215a46f5ec87e18158fdc6ce169d0b5622aad71afdcc29d2a20a.jpg"}],["$","meta","13",{"name":"twitter:image:width","content":"640"}],["$","meta","14",{"name":"twitter:image:height","content":"400"}],["$","link","15",{"rel":"icon","href":"/favicon.ico?favicon.2hqc0rwsy9zm6.ico","sizes":"96x96","type":"image/x-icon"}],["$","link","16",{"rel":"icon","href":"/icon.png?icon.1mhghqfpotdlb.png","sizes":"512x512","type":"image/png"}],["$","$L4a","17",{}]] 48:null