D3 Examples - Merging States

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.graticule {
  fill: none;
  stroke: #777;
  stroke-opacity: .5;
  stroke-width: .5px;
  pointer-events: none;
}
​
.land {
  fill: #222;
  stroke: orange;
}
​
.border {
  fill: none;
  stroke: #fff;
  stroke-width: .5px;
}
​
</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 = 960;
​
var projection = d3.geo.mercator()
    .scale(width / 2 / Math.PI)
    .translate([width / 2, height / 2])
    .precision(.1);
​
var path = d3.geo.path()
    .projection(projection);
​
var graticule = d3.geo.graticule();
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
svg.append("path")
    .datum(graticule)
    .attr("class", "graticule")
    .attr("d", path);
​
d3.json("world.json", function(error, world) {
  if (error) throw error;
​
  svg.insert("path", ".graticule")
      .datum(topojson.merge(world, world.objects.states.geometries))
      .attr("class", "land")
      .attr("d", path);
​
  svg.insert("path", ".graticule")
      .datum(topojson.mesh(world, world.objects.states, function(a, b) { return a !== b; }))
      .attr("class", "border")
      .attr("d", path);
});
​
d3.select(self.frameElement).style("height", height + "px");
​
</script>
​
    