D3 Examples - ischool-geo-viz-template

Template

Here you will find an empty HTML template for the workshop. We'll be adding javascript code to the section between the opening and closing <script></script> tags in the index.html file.

Let's get started!

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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:100%; }
    </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/light-v9',
    center: [-74.0059, 40.7127],
    zoom: 10
    
  })
  
  d3.json(dataURL, function (error, data){
          
    if (error) throw error;
    
    console.log(data);
    
    // 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': {
          property: 'crash-type',
          type: 'categorical',
          stops: [
            ['no_injury_fatality', '#FECC5C'],
            ['injury', '#FD8D3C'],
            ['fatality', '#F03B20'],
            ['injury_and_fatality', '#BD0026']
          ]
        },
        'circle-opacity': 0.8,
        'circle-radius': {
          'base': 1.75,
          'stops': [
            [12,2],
            [22, 180]
          ]
        }
      }
    });
    
    });
  
</script>
</body>
</html>
​
    