32:T839,map = { let h = (width<600) ? width + 200: width * 0.75, z = (width<600) ? 6.5 : 7, container = DOM.element('div', { style: `width:${width}px;height:${h}px` }); yield container; let map = L.map(container) .setView([43.68, -70.26], 13) // initializes the map, sets zoom & coordinates let osmLayer = L.tileLayer('https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}@2x.png', { attribution: '© OpenStreetMap contributors' }).addTo(map); let parcelOverlay = L.geoJson(parcelCollection, { pointToLayer: function (feature, latlng) { let val21 = feature.properties.val21.taxableValue, val20 = feature.properties.val20 ? feature.properties.val20.taxableValue : null, c = (val20 && (val20 > 0)) ? ( (val21>=val20) ? colorRamp((val21-val20)/val20) : '#542788') : '#fff'; return L.circleMarker(latlng, { radius: 2, color: "#000", weight: 0, opacity: 0.8, fillOpacity: 1, fillColor: c }); }, onEachFeature: function(feature, layer) { let val21 = feature.properties.val21.taxableValue, val20 = feature.properties.val20 ? feature.properties.val20.taxableValue : 'N/A', pctChange = feature.properties.val20 ? (100*(val21-val20)/val20).toFixed(2) : 'N/A'; layer.bindTooltip( '

'+feature.properties.address+'

' + '

Total taxable value, 2020: $'+ val20 + '
Total taxable value, 2021: $' + val21 + '
Percent change: ' + pctChange + '%

' )} }).addTo(map); map.on('zoomend', function() { var currentZoom = map.getZoom(); let z = (currentZoom > 14) ? 5 : 2; let s = (currentZoom > 15) ? 1 : 0; parcelOverlay.eachLayer(function (marker) { marker.setRadius(z); marker.setStyle({weight: s}); }); }); let legend = L.control({position: 'bottomleft'}) legend.onAdd = function (map) {var div = L.DomUtil.create('div', 'legend'); return l}; legend.addTo(map); }33:T7e5,valuePerAcreMap = { let h = (width<600) ? width + 200: width * 0.75, z = (width<600) ? 6.5 : 7, container = DOM.element('div', { style: `width:${width}px;height:${h}px` }); yield container; let valuePerAcreMap = L.map(container) .setView([43.68, -70.26], 13) // initializes the map, sets zoom & coordinates let osmLayer = L.tileLayer('https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}@2x.png', { attribution: '© OpenStreetMap contributors' }).addTo(valuePerAcreMap); let parcelOverlay = L.geoJson(parcelCollection, { pointToLayer: function (feature, latlng) { let val21 = feature.properties.val21.taxableValue, a = feature.properties.acreage, c = (a > 0) ? colorRamp2(val21/a) : '#fff'; return L.circleMarker(latlng, { radius: 1.5, color: "#000", weight: 0, opacity: 0.8, fillOpacity: 1, fillColor: c }); }, onEachFeature: function(feature, layer) { let val21 = feature.properties.val21.taxableValue, a = feature.properties.acreage, vpa = (a>0) ? (val21/a).toFixed(2) : 'N/A'; layer.bindTooltip( '

'+feature.properties.address+'

' + '

Total taxable value, 2021: $'+ internationalNumberFormat.format(val21) + '
Acreage: ' + a + ' acres' + '
Per acre: $' + internationalNumberFormat.format(vpa) + '

' )} }).addTo(valuePerAcreMap); valuePerAcreMap.on('zoomend', function() { var currentZoom = map.getZoom(); let z = (currentZoom > 14) ? 5 : 2; let s = (currentZoom > 15) ? 1 : 0; parcelOverlay.eachLayer(function (marker) { marker.setRadius(z); marker.setStyle({weight: s}); }); }); let legend = L.control({position: 'bottomleft'}) legend.onAdd = function (map) {var div = L.DomUtil.create('div', 'legend'); return l2}; legend.addTo(valuePerAcreMap); }34:[{"id":"af62588f504fc35eb287205affc503100e2014bc0bf0e7d514b16777e801fc43c1d27f37c5795afa6dde271ea204331c5bfd628810dc97ceaab82b840dcb0878","href":"https://static.observableusercontent.com/files/af62588f504fc35eb287205affc503100e2014bc0bf0e7d514b16777e801fc43c1d27f37c5795afa6dde271ea204331c5bfd628810dc97ceaab82b840dcb0878","name":"assessmentdata.json","type":"application/json","lastModified":1626318217226.178,"size":13630887}] 30:{"title":"Portland Maine property tax revaluation analysis","cells":[{"id":283,"value":"md`# Portland Maine property tax revaluation analysis\n\nA visualization of public property assessment data scraped from the Portland Assessor's database by Bill Mill. See his methodology here: https://github.com/llimllib/portland-revaluation/\n\nSome caveats: this project used an automated geocoder to assign latitude and longitude coordinates for each parcel based on each parcel's address. That means that some parcels with ambiguous street addresses in the assessor's database are being rendered on this map in inaccurate locations (in South Portland, for instance, or inside the Evergreen Cemetery); other parcels aren't rendered at all. Many condomiuniums, which often share one address, also can't be seen on this map.\n\nHover over a point to see address and assessment details from the assessor's database.`\n","pinned":false,"hidden":false,"mode":"ojs"},{"id":19,"value":"$32","pinned":true,"hidden":false,"mode":"ojs"},{"id":525,"value":"md`# Taxable value per acre, 2021\n\nThis map illustrates the ratio of each parcel's taxable value to its acreage, according to the assessor's database. Smaller parcels on the Portland peninsula generally have higher taxable values and lower land areas, generating a higher value per acre.\n\nHover over a point to see assessment details from the assessor's database.`","pinned":true,"hidden":false,"mode":"ojs"},{"id":461,"value":"$33","pinned":true,"hidden":false,"mode":"ojs"},{"id":4,"value":"L = require('leaflet@1.2.0')","pinned":true,"hidden":false,"mode":"ojs"},{"id":6,"value":"html``","pinned":true,"hidden":false,"mode":"ojs"},{"id":37,"value":"topojson = require(\"topojson-client@3\")\n","pinned":true,"hidden":false,"mode":"ojs"},{"id":302,"value":"parcelCollection = { \n let a = new Object;\n a.type = \"FeatureCollection\";\n a.features = parcelGeo;\n yield a;\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":294,"value":"parcelGeo = parcelFile.map( d => {\n let o = new Object;\n o.type = \"Feature\";\n o.properties = d;\n o.geometry = {\"type\":\"Point\", \"coordinates\": [+d.lng,+d.lat]};\n return o;\n });","pinned":true,"hidden":false,"mode":"ojs"},{"id":288,"value":"parcelFile = FileAttachment(\"assessmentdata.json\").json()","pinned":true,"hidden":false,"mode":"ojs"},{"id":106,"value":"import {legend} from \"@d3/color-legend\"","pinned":true,"hidden":false,"mode":"ojs"},{"id":111,"value":"colorRamp = d3.scaleLinear()\n .domain([0,0.52,3])\n .range([ \"#2166ac\", \"#ffffbf\", \"#b2182b\"])","pinned":true,"hidden":false,"mode":"ojs"},{"id":474,"value":"colorRamp2 = d3.scaleLinear()\n .domain([100000,10000000,40000000])\n .range([ \"#b3cde3\", \"#756bb1\",'#b30000'])","pinned":true,"hidden":false,"mode":"ojs"},{"id":483,"value":"\ninternationalNumberFormat = new Intl.NumberFormat('en-US')","pinned":true,"hidden":false,"mode":"ojs"},{"id":488,"value":"l2 = legend({\n color: colorRamp2,\n title: \"Taxable value per acre, 2021\", \n tickValues : [1000000,10000000,40000000],\n tickFormat: d3.format(\"$,.1s\")\n})","pinned":true,"hidden":false,"mode":"ojs"},{"id":108,"value":"l = legend({\n color: colorRamp,\n title: \"% in total assessed value, 2020 to 2021\", \n tickFormat: d => (d*100)+\"%\"\n})","pinned":true,"hidden":false,"mode":"ojs"},{"id":95,"value":"d3 = require('d3@5.0')\n","pinned":true,"hidden":false,"mode":"ojs"}],"files":"$W34","stdlib":"1","titling":"auto"}