ischool-geo-viz-in-class

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.

Built with blockbuilder.org

forked from clhenrick's block: ischool-geo-viz-00

<!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>

<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';

// completed steps: https://bit.ly/geoviz-notes
  
  // set mapboxGL access token
  mapboxgl.accessToken = accessToken;
  
  // instantiate the map object
  var map = new mapboxgl.Map({
    container: "map",
    style: "mapbox://styles/mapbox/light-v9",
    center: [-74, 40.7],
    zoom: 10
  });
  
  // add map navigation controls
  map.addControl(new mapboxgl.NavigationControl());
  
  // do stuff on map load
  map.on("load", function() {
    
    // load our data
    d3.json(dataURL, function(error, data) {
      
      if (error) throw error;
      
      // vehicle collison data from nyc open data    
      console.log(data);
      
      // add our source
      map.addSource("crashes", {
        type: "geojson",
        data: data,
//         cluster: true,
//         clusterRadius: 10,
//         clusterMaxZoom: 12
      });
      
      // add crashes layer to the 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]
//             ]
//           }
//         }
//       });
      
    }); // ends d3.json
    
    // load hexbin data
    d3.json(hexBinURL, function(error, hexbins) {
      
      if (error) throw error;
      
      console.log(hexbins);
      
      // from https://colorbrewer2.org/
      var colorRamp = ['#f1eef6','#d4b9da','#c994c7','#df65b0','#e7298a','#ce1256','#91003f']
      
      map.addSource("hexGrid", {
        type: "geojson",
        data: hexbins
      });
      
      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": 0.6
        }
      })
    }); // ends d3.json hexbin
    
  }); // ends map on load
  
  
  
  
  
  
  
  
  
  
  
  
  
  
</script>
</body>
</html>

https://d3js.org/d3.v4.min.js

https://api.tiles.mapbox.com/mapbox-gl-js/v0.43.0/mapbox-gl.js