Simple Map with D3

Creating a simple map with D3.

Learn more:

Let’s Make a Map

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">

<title>Simple Map with D3</title>

svg {
    background-color: #A7DBD8;
  }

.land {
    fill: #E0E4CC;
    stroke: #ACAF9F;
    stroke-width: 1;
  }
  </style>

// Set the dimensions of the map
    var width  = 960,
        height = 480;

// Create a selection for the container div and append the svg element
    var div = d3.select('#map-container'),
        svg = div.selectAll('svg.map').data([0]);

svg.enter().append('svg')
      .classed('map', true);

// Set the size of the SVG element
    svg
      .attr('width', width)
      .attr('height', height);

svg.exit().remove();

// Retrieve the geographic data asynchronously
    d3.json('land.geojson', function(err, data) {

// Throw errors on getting or parsing the file
      if (err) { throw err; }

// Create and configure a geographic projection
      var projection = d3.geo.equirectangular()
        .translate([width / 2, height / 2])
        .scale(width / (2 * Math.PI));

// Create and configure a path generator
      var pathGenerator = d3.geo.path()
        .projection(projection);

// Create a selection for the path elements and bind the
      // geographic data to the selection
      var land = svg.selectAll('path.land').data([data]);

// Append the path element on enter and set its class
      land.enter().append('path')
        .classed('land', true);

// Use the path generator to convert from GeoJSON to SVG string
      land.attr('d', function(d) { return pathGenerator(d); });

// Remove the path element on exit
      land.exit().remove();

});
  </script>

</body>
</html>

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