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Plot: Walmart Voronoi

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\n\n# Walmart Voronoi\n\nThe [Voronoi](https://observablehq.com/plot/marks/delaunay) diagram of the Walmart stores in the contiguous U.S. shows the catchment area of each point.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":3,"value":"walmart_map = Plot.plot({\n title: \"Walmart Stores in the US from 1960-2010\",\n subtitle: \"Each point represents one Walmart store and its color encodes the year it was opened.\",\n caption: htl.html`Forked from Walmart Voronoi. Data source: The Diffusion of Wal-Mart and Economies of Density, 2010`,\n projection: \"albers-usa\",\n color: {\n legend: true,\n scheme: \"GnBu\",\n type: \"quantize\",\n domain: [1960, 2010],\n },\n marks: [\n Plot.geo(nation, {fill: \"#A9A9A9\", fillOpacity: 0.4, stroke: \"black\"}),\n Plot.dot(walmarts, \n {x: \"longitude\", \n y: \"latitude\", \n fill: d => d.date.getFullYear(), \n r: 1.5, \n }),\n Plot.voronoiMesh(walmarts, {x: \"longitude\", y: \"latitude\", opacity: 0.2, title: d => formatDate(d.date), tip: true}), \n Plot.geo(statemesh, {stroke: \"white\"})\n ]\n})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":83,"value":"formatDate = d3.utcFormat(\"%B %d, %Y\");","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":33,"value":"statemesh = topojson.mesh(us, us.objects.states, (a, b) => a !== b);","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$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":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":12,"value":"nation = topojson.feature(us, us.objects.nation)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":9,"value":"walmarts = FileAttachment(\"walmarts.tsv\").tsv({typed: true})","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":20,"value":"## Sources \n\n- The dataset is from a paper called \"The Diffusion of Wal-Mart and Economies of Density\", the citation for the dataset can be found [here](https://users.econ.umn.edu/~holmes/data/WalMart/store_openings.html)","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"}],"files":"$W31","stdlib":"1"}} 30:"$2f:body"