${data.title[0]}${labels[j] && ` (${labels[j]})`} ${data.title[1]}${labels[i] && ` (${labels[i]})`}

29:null 2a:["$","title",null,{"children":"Bivariate Choropleth Mapping | Adam | Observable"}] 2f:T44c,legend = () => { const k = 24; const arrow = DOM.uid(); return svg` ${d3.cross(d3.range(n), d3.range(n)).map(([i, j]) => svg` ${data.title[0]}${labels[j] && ` (${labels[j]})`} ${data.title[1]}${labels[i] && ` (${labels[i]})`} `)} ${data.title[0]} ${data.title[1]} `; }30:[{"id":"82f188163ef9258279c4e2c841c93624c6c29f4a931b80c734bfe72096787302dbef79ab9780e393f4a5fd78e351a482a9bb294f23607d609a9c8e1c90dacea9","href":"https://static.observableusercontent.com/files/82f188163ef9258279c4e2c841c93624c6c29f4a931b80c734bfe72096787302dbef79ab9780e393f4a5fd78e351a482a9bb294f23607d609a9c8e1c90dacea9","name":"chicago_tracts_2010_cleaned.csv","type":"text/csv","lastModified":1682881816154.407,"size":377202},{"id":"6bbcf2e3a9fd2cf3d066de38592cb077a55e80dc6edf1bdc35d1708ad4d37ae1c0ad59a4e3dd39b4c7a38c3c4f88a197350c8e2d576f626922625f456a86d54c","href":"https://static.observableusercontent.com/files/6bbcf2e3a9fd2cf3d066de38592cb077a55e80dc6edf1bdc35d1708ad4d37ae1c0ad59a4e3dd39b4c7a38c3c4f88a197350c8e2d576f626922625f456a86d54c","name":"chicago_tracts_2010_cleaned.json","type":"application/json","lastModified":1682881816154.407,"size":1725175},{"id":"03ac8e5b8c9baefc95cc66538be653be88ddaa36b4e206ae6d87b2f93a296df00d8a19deebe68c4fe8fdb44717190a866307cac087d48d5b4215b3f392307561","href":"https://static.observableusercontent.com/files/03ac8e5b8c9baefc95cc66538be653be88ddaa36b4e206ae6d87b2f93a296df00d8a19deebe68c4fe8fdb44717190a866307cac087d48d5b4215b3f392307561","name":"svi_iowa_2020.csv","type":"text/csv","lastModified":1682882648398.652,"size":70185},{"id":"db823d3db952f637ced08fecea8ff514b153c6d45608b0e7375202c3ecebf2d226fd35179024f1292a1efaad0026110d5dcf0422f0d6fc98daa0874d4276e659","href":"https://static.observableusercontent.com/files/db823d3db952f637ced08fecea8ff514b153c6d45608b0e7375202c3ecebf2d226fd35179024f1292a1efaad0026110d5dcf0422f0d6fc98daa0874d4276e659","name":"SVI2020_IOWA_county.json","type":"application/json","lastModified":1682882660873.916,"size":640977},{"id":"e8570cc7c93d3fd07c519d793a6e41145657761bd97b276492815dce4485fe0ab8049204fab544a90d92648ea1e1f2289f8d87186fc7c7773c75e5d0e57baa5c","href":"https://static.observableusercontent.com/files/e8570cc7c93d3fd07c519d793a6e41145657761bd97b276492815dce4485fe0ab8049204fab544a90d92648ea1e1f2289f8d87186fc7c7773c75e5d0e57baa5c","name":"shapefilewgstest.json","type":"application/json","lastModified":1682883649463.357,"size":307488}] 2d:{"id":"e4927b6d53d39af5","slug":null,"title":"Bivariate Choropleth Mapping","thumbnail":"0985ccfac29b5448e2269bf23b07b09358a81b2031ba0e0806d195b608d6bcd2","access_level":"public","create_time":"$D2023-04-30T19:10:16.154Z","update_time":"$D2023-04-30T19:45:30.433Z","view_time":null,"first_public_time":"$D2023-04-30T19:10:16.154Z","fork":{"id":"65c7f6ce9b65d583","slug":"bivariate-choropleth-mapping","title":"Bivariate Choropleth Mapping","owner":{"id":"22130e106df70095","login":"geoviz","name":"Geographic Visualization (GEOG 3540) - University of Iowa"}},"stars":0,"starred":false,"owner":{"type":"team","id":"0c7e2569ffe4c642","login":"adamdodds3","name":"Adam","avatar_url":"https://avatars-next.observableusercontent.com/bad8c981edcea83c1862670d32628899338c2b33c3f5e91d35eac13b73ed5ed3","tier":"starter_2024"},"version":540,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"d77829c4ac534e39","login":"adamdodds3","name":"Adam","avatar_url":"https://avatars-next.observableusercontent.com/bad8c981edcea83c1862670d32628899338c2b33c3f5e91d35eac13b73ed5ed3","tier":null}],"members":[{"type":"individual","id":"d77829c4ac534e39","login":"adamdodds3","name":"Adam","avatar_url":"https://avatars-next.observableusercontent.com/bad8c981edcea83c1862670d32628899338c2b33c3f5e91d35eac13b73ed5ed3","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"subscribed":null,"forks":0,"collection":null,"type":"notebook","body":{"title":"Bivariate Choropleth Mapping","cells":[{"id":0,"value":"md`# Bivariate Choropleth Mapping\n\nAverage Household Size and % Renter Occupied by Census Tracts of Chicago Metropolitan Area. Data: [Census 2010]`","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":194,"value":"viewof colors = {\n const form = html`

color scheme`;\n form.i.selectedIndex = 1;\n form.oninput = () => form.value = schemes[form.i.selectedIndex].colors;\n form.oninput();\n return form;\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":14,"value":"chart = {\n const svg = d3.create(\"svg\")\n .attr(\"viewBox\", [0, 0, width, height]);\n\n svg.append(legend)\n .attr(\"transform\", \"translate(670,250)\");\n\n svg.append(\"g\")\n .selectAll(\"path\")\n .data(topojson.feature(polygons, polygons.objects.wgstest).features)\n .join(\"path\")\n .attr(\"fill\", d => color(data.get(d.properties[idAttribute])))\n .attr(\"d\", path)\n .append(\"title\")\n .text(d => `${d.properties[idAttribute]}, ${format(data.get(d.properties[idAttribute]))}`);\n\n return svg.node();\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":359,"value":"// http://www.joshuastevens.net/cartography/make-a-bivariate-choropleth-map/\nschemes = [\n {\n name: \"RdBu\", \n colors: [\n \"#e8e8e8\", \"#e4acac\", \"#c85a5a\",\n \"#b0d5df\", \"#ad9ea5\", \"#985356\",\n \"#64acbe\", \"#627f8c\", \"#574249\"\n ]\n },\n {\n name: \"BuPu\", \n colors: [\n \"#e8e8e8\", \"#ace4e4\", \"#5ac8c8\",\n \"#dfb0d6\", \"#a5add3\", \"#5698b9\", \n \"#be64ac\", \"#8c62aa\", \"#3b4994\"\n ]\n },\n {\n name: \"GnBu\", \n colors: [\n \"#e8e8e8\", \"#b5c0da\", \"#6c83b5\",\n \"#b8d6be\", \"#90b2b3\", \"#567994\",\n \"#73ae80\", \"#5a9178\", \"#2a5a5b\"\n ]\n },\n {\n name: \"PuOr\", \n colors: [\n \"#e8e8e8\", \"#e4d9ac\", \"#c8b35a\",\n \"#cbb8d7\", \"#c8ada0\", \"#af8e53\",\n \"#9972af\", \"#976b82\", \"#804d36\"\n ]\n }\n]","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":216,"value":"labels = [\"low\", \"\", \"high\"]","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":207,"value":"n = Math.floor(Math.sqrt(colors.length))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":209,"value":"x = d3.scaleQuantile(Array.from(data.values(), d => d[0]), d3.range(n))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":204,"value":"y = d3.scaleQuantile(Array.from(data.values(), d => d[1]), d3.range(n))","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":486,"value":"path = d3.geoPath().projection(projection)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":462,"value":"//Rotate the map sets the longitude of origin for our UTM projection.\nprojection = d3.geoTransverseMercator().rotate([87,0]).fitExtent([[10, 10], [width, height]], polygon_features);","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":430,"value":"polygon_features = topojson.feature(polygons, polygons.objects.wgstest)","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":467,"value":"data = Object.assign(new Map(d3.csvParse(await FileAttachment(\"svi_iowa_2020.csv\").text(), ({FIPS, RPL_THEMES, COUNTY}) => [FIPS, [+RPL_THEMES]])), {title: [\"Avg Household\", \" % Renter Occupied\"]})","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":483,"value":"idAttribute = \"FIPS\"","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":8,"value":"polygons = FileAttachment(\"shapefilewgstest.json\").json()","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":427,"value":"height = 610","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":424,"value":"width = 875","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":480,"value":"$2f","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":477,"value":"color = {\n return value => {\n if (!value) return \"#ccc\";\n let [a, b] = value;\n return colors[y(b) + x(a) * n];\n };\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":513,"value":"formatNum = d3.format(\".1f\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":474,"value":"format = (value) => {\n if (!value) return \"N/A\";\n let [a, b] = value;\n return `${a} ${data.title[0]}${labels[x(a)] && ` (${labels[x(a)]})`}\n${formatNum(b)} ${data.title[1]}${labels[y(b)] && ` (${labels[y(b)]})`}`;\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":6,"value":"topojson = require(\"topojson-client@3\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":3,"value":"d3 = require(\"d3@5\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"}],"files":"$W30","stdlib":"1","titling":"auto"}} 2e:"$2d:body"