D3 Examples - ischool-geo-viz-template

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<!DOCTYPE html>
<html>
<head>
    <meta charset='utf-8' />
    <title>iSchool GeoVisualization Workshop</title>
    <meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
    <script src="//d3js.org/d3.v3.min.js"></script>
        <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.35.0/mapbox-gl.js'></script>
    <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.35.0/mapbox-gl.css' rel='stylesheet' />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/turf.js/2.0.2/turf.min.js"></script>
    <style>
        body { margin:0; padding:0; }
        #map { position:absolute; top:0; bottom:0; width:700px; }
    </style>
</head>
<body>
<div id='map'></div>
<script>
​
  // javascript code goes here
  var dataURL = "https://raw.githubusercontent.com/clhenrick/geovisualization_workshop_ischool/master/data/nyc_crashes.geojson";
  var accessToken = 'pk.eyJ1IjoiZW5qYWxvdCIsImEiOiIzOTJmMjBiZmI2NGQ2ZjAzODhiMzhiOGI2MTI1YTk4YSJ9.sIOXXU3TPp5dLg_L3cUxhQ';
  
  mapboxgl.accessToken = accessToken;
  
  var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/mapbox/dark-v9',
    center: [-74.0059, 40.7127],
    zoom: 10
  });
  
  d3.json(dataURL, function(error, data) {
    if (error) throw error;
//     console.log(data);
    
    // bounding box of NYC
    var bbox = [-74.2777, 40.488, -73.66, 40.939];
    // cellsize of our hex bins
    var cellSize = 5;
    // units of measure for cell size
    var units = 'kilometers';
    
    var hexGrid = turf.hexGrid(bbox, cellSize, units);
    // count number of crashes
    var hexCrashes = turf.count(hexGrid, data, 'totalCrashes');
    var numberOfBreaks = 5;
    var jenksBreaks = turf.jenks(hexCrashes, 'totalCrashes', numberOfBreaks);
    
    var colors = ['#feebe2', '#fbb4b9', '#f768a1', '#aaa', '#aaa']
    
    var colorStops = jenksBreaks.map(function(b, i) {
      if (i > 0) {
        return [b, colors[i-1]];
      } else {
        return [b, 'rgb(0,0,0,0)']
      }
    });
    
    map.addSource('crashesHexGrd', {
      type: 'geojson',
      data: hexCrashes
    });
    
    map.addLayer({
      id: "crashesHexGrid",
      type: "fill",
      source: "crashesHexGrid",
      layout: {},
      paint: {
        "fill-color": {
          property: "totalCrahes",
          stops: colorStops
          
        },
        "fill-opacity"" 0.6
      }
    })
    
    // add our data source to our map object
//     map.addSource('crashes', {
//       type: 'geojson',
//       data: data
//     })
    
//     // add our layer style definition
//     map.addLayer({
//       id: 'crashes',
//       type: 'circle',
//       source: 'crashes',
//       layout: {},
//       paint: {
// //         'circle-color': 'orange',
//         'circle-color': {
//           property: 'crash_type',
//           type: 'categorical',
//           stops: [
//             ['no_injury_fatality', '#FECC5C'],
//             ['injury', '#FD8D3C'],
//             ['fatality', '#F03B20'],
//             ['injury_and_fatality', '#BD0026']
//           ]
//         },
//         'circle-opacity': 0.8,
// //         'circle-radius': 5
//         // set circle radius to be 2 at near beginning,
//         // then increase to 180 at zoom 22
//         'circle-radius': {
//           'base': 1.75,
//           'stops': [
//             [12, 2],
//             [22, 180]
//           ]
//         }
//       }
//     });
  });
​
  // Final solution at https://github.com/clhendrick/visualization_workshop_ischool
</script>
</body>
</html>
​
    