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Mapping LA
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| license: mit |
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' /> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src='https://api.mapbox.com/mapbox-gl-js/v0.31.0/mapbox-gl.js'></script> | |
| <link href='https://api.mapbox.com/mapbox-gl-js/v0.31.0/mapbox-gl.css' rel='stylesheet' /> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| #map { | |
| position:absolute; | |
| width: 100%; | |
| height: 100%; | |
| } | |
| canvas { | |
| position: absolute; | |
| width: 100%; | |
| height: 100%; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="map"></div> | |
| <script> | |
| function buildUrl(url, queryParams) { | |
| url += '?'; | |
| queryParams.forEach(function(param){ | |
| url += `${param}&` | |
| }) | |
| return url.slice(0, -1); | |
| } | |
| </script> | |
| <script> | |
| //Setup mapbox-gl map | |
| mapboxgl.accessToken = 'pk.eyJ1Ijoiam9uc2Fka2EiLCJhIjoiY2l4ejkzM3FuMDA0bzMycDl2ZXE0cGw2byJ9.YVf_mtIw3xABynhjwojKQg'; | |
| const map = new mapboxgl.Map({ | |
| container: 'map', // id of the container | |
| style: 'mapbox://styles/jonsadka/cixzpqzbj003g2srjakw769o5', | |
| center: [-118.5, 34], | |
| zoom: 7.5, | |
| scrollZoom: true | |
| }) | |
| // map.addControl(new mapboxgl.NavigationControl()) | |
| function project(d) { | |
| const position = getLatLong(d); | |
| if (position) { | |
| return map.project(position); | |
| } | |
| } | |
| function getLatLong(d) { | |
| const longitude = +d.center_lon || (+d.location_1 || {}).longitude; | |
| const latitude = +d.center_lat || (+d.location_1 || {}).latitude; | |
| if (longitude && latitude) { | |
| return new mapboxgl.LngLat(longitude, latitude); | |
| } | |
| } | |
| const container = map.getCanvasContainer(); | |
| const canvas = d3.select(container).append('canvas').node(); | |
| const boundingBox = document.body.getBoundingClientRect(); | |
| canvas.width = boundingBox.width; | |
| canvas.height = boundingBox.height; | |
| const context = canvas.getContext('2d'); | |
| const url06To16 = 'https://data.lacounty.gov/resource/hvzm-fn38.json'; | |
| d3.queue() | |
| // .defer(d3.json, 'https://data.lacounty.gov/resource/mdji-9cym.json') | |
| .defer(d3.json, buildUrl(url06To16, [ | |
| '$where=units > 22', '$limit=20000', 'yearbuilt=1989' | |
| ])) | |
| .await(initialRender) | |
| function initialRender(error, propertyData) { | |
| if (error) return console.warn(error); | |
| console.log( | |
| propertyData.length, | |
| propertyData[0], | |
| getLatLong(propertyData[0]), | |
| project(propertyData[0]) | |
| ) | |
| // Initial render | |
| render(propertyData); | |
| // re-render our visualization whenever the view changes | |
| map.on('viewreset', function() { | |
| context.clearRect(0, 0, boundingBox.width, boundingBox.height); | |
| render(propertyData); | |
| }) | |
| map.on('move', function() { | |
| context.clearRect(0, 0, boundingBox.width, boundingBox.height); | |
| render(propertyData); | |
| }) | |
| } | |
| function render(data) { | |
| const propertyValues = data.reduce(function(_propertyValues, property){ | |
| if (property.roll_totlandimp) { | |
| _propertyValues.push(+property.roll_totlandimp); | |
| } | |
| return _propertyValues; | |
| }, []); | |
| const propertyValueColor = d3.scaleLog() | |
| .range(['hsl(62,100%,90%)', 'hsl(228,30%,20%)']) | |
| .domain([d3.quantile(propertyValues, .01), d3.quantile(propertyValues, .99)]) | |
| .interpolate(d3.interpolateHcl); | |
| context.clearRect(0, 0, boundingBox.width, boundingBox.height); | |
| data.forEach(function(property, idx) { | |
| const point = project(property); | |
| if (point) { | |
| context.fillStyle = propertyValueColor(+property.roll_totlandimp); | |
| context.beginPath(); | |
| context.arc(point.x, point.y, 4, 0, Math.PI * 2); | |
| context.fill(); | |
| // context.stroke(); | |
| } | |
| }) | |
| } | |
| </script> | |
| </body> |
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