D3 Examples - ischool-geo-viz-00

Template
Here you will find an HTML template for the geo-viz workshop. We'll be adding javascript code to the section between the opening and closing <script></script> tags in the index.html file. There are already some variables there to help us get started with.
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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.v4.min.js"></script>
        <script src='https://api.tiles.mapbox.com/mapbox-gl-js/v0.43.0/mapbox-gl.js'></script>
        <link href='https://unpkg.com/mapbox-gl@0.43.0/dist/mapbox-gl.css' rel='stylesheet' />
    <style>
        body { margin:0; padding:0; }
        #map { position:absolute; top:0; bottom:0; width:100%; }
    </style>
</head>
<body>
​
  <!-- this div with an id of "map" will be used to create our map -->
  <div id='map'></div>
  
<script>
​
  // javascript code goes here!!!
  
  // url to our "raw" geo data
  var dataURL = "https://raw.githubusercontent.com/clhenrick/geovisualization_workshop_ischool/master/data/nyc_crashes.geojson";
  
  // url to hexbins
  var hexBinURL = "https://gist.githubusercontent.com/clhenrick/5787a12a8bf3b02821839e4f9556d997/raw/f18f34a319380ba471078baec382970dbc64a9ff/processed.json";
​
  // access token to use with MapboxGL
  var accessToken = 'pk.eyJ1IjoiZW5qYWxvdCIsImEiOiIzOTJmMjBiZmI2NGQ2ZjAzODhiMzhiOGI2MTI1YTk4YSJ9.sIOXXU3TPp5dLg_L3cUxhQ';
​
  // set mapboxGL access token
  mapboxgl.accessToken = accessToken;
  
  // instantiate the map object
  var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/mapbox/dark-v9',
    center: [-74, 40.7],
    zoom: 10
  });
  
  // add map navigation
  map.addControl(new mapboxgl.NavigationControl());
  
  // do stsuff on map load
  map.on("load", function(){
    
    d3.json(hexBinURL, function(error, data){
            if (error) throw error;
    console.log(data);
      
      // add our source
      map.addSource("crashes", {
        type: "geojson",
        data: data,
//         cluster: true,
//         clusterRadius: 10,
//         clusterMaxZoom: 12
      });
      
      // add layer to map
      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]
            ]
          }
        }
      });
      
      var colorRamp = ['#ffffd4','#fee391','#fec44f','#fe9929','#ec7014','#cc4c02','#8c2d04']
      
      // add hexbins
      map.addSource("hexGrid", {
        type: "geojson",
        data: data
      });
      
      map.addLayer ({
        id: "hexGrid",
        type: "fill",
        source: "hexGrid",
        layout: {},
        paint: {
          "fill-color": {
            property: "bin",
            stops: colorRamp.map(function(d,i){return [i,d];}),
          },
          "fill-opacity": 0.5
        }
      });
      
            }); // end d3.json
    
  });
  
  
  
  
  
  
</script>
</body>
</html>
​
    