D3 Examples - New York Census Tracts

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.tract {
  fill: #ccc;
}
​
.tract:hover {
  fill: orange;
}
​
.tract-border {
  fill: none;
  stroke: #333;
  stroke-linejoin: round;
  stroke-linecap: round;
}
​
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>
​
var width = 960,
    height = 700;
​
var path = d3.geo.path()
    .projection(null);
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
d3.json("ny.json", function(error, ny) {
  if (error) throw error;
​
  var tracts = ny.objects.tracts;
​
  // strip water counties
  tracts.geometries = tracts.geometries
    .filter(function(d) { return (d.id / 10000 | 0) !== 99; });
​
  svg.append("g")
    .selectAll("path")
      .data(topojson.feature(ny, tracts).features)
    .enter().append("path")
      .attr("class", "tract")
      .attr("d", path)
    .append("title")
      .text(function(d, i) { return d.id; });
​
  svg.append("path")
      .attr("class", "tract-border")
      .datum(topojson.mesh(ny, tracts, function(a, b) { return a !== b; }))
      .attr("d", path);
});
​
d3.select(self.frameElement).style("height", height + "px");
​
</script>
​
    