D3 Examples - UK map

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.subunit.SCT { fill: #ddc; }
.subunit.WLS { fill: #cdd; }
.subunit.NIR { fill: #cdc; }
.subunit.ENG { fill: #dcd; }
​
.subunit.IRL,
.subunit-label.IRL {
  display: none;
}
​
.subunit-boundary {
  fill: none;
  stroke: #777;
  stroke-dasharray: 2,2;
  stroke-linejoin: round;
}
​
.subunit-boundary.IRL {
  stroke: #aaa;
}
​
.subunit-label {
  fill: #777;
  fill-opacity: .5;
  font-size: 20px;
  font-weight: 300;
  text-anchor: middle;
}
​
.place,
.place-label {
  fill: #444;
}
​
text {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 10px;
  pointer-events: none;
}
​
</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://d3js.org/topojson.v0.min.js"></script>
<script>
​
var width = 960,
    height = 1160;
​
var projection = d3.geo.albers()
    .center([0, 55.4])
    .rotate([4.4, 0])
    .parallels([50, 60])
    .scale(1200 * 5)
    .translate([width / 2, height / 2]);
​
var path = d3.geo.path()
    .projection(projection)
    .pointRadius(2);
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
d3.json("uk.json", function(error, uk) {
  var subunits = topojson.object(uk, uk.objects.subunits),
      places = topojson.object(uk, uk.objects.places);
​
  svg.selectAll(".subunit")
      .data(subunits.geometries)
    .enter().append("path")
      .attr("class", function(d) { return "subunit " + d.id; })
      .attr("d", path);
​
  svg.append("path")
      .datum(topojson.mesh(uk, uk.objects.subunits, function(a, b) { return a !== b && a.id !== "IRL"; }))
      .attr("d", path)
      .attr("class", "subunit-boundary");
​
  svg.append("path")
      .datum(topojson.mesh(uk, uk.objects.subunits, function(a, b) { return a === b && a.id === "IRL"; }))
      .attr("d", path)
      .attr("class", "subunit-boundary IRL");
​
  svg.selectAll(".subunit-label")
      .data(subunits.geometries)
    .enter().append("text")
      .attr("class", function(d) { return "subunit-label " + d.id; })
      .attr("transform", function(d) { return "translate(" + path.centroid(d) + ")"; })
      .attr("dy", ".35em")
      .text(function(d) { return d.properties.name; });
​
  svg.append("path")
      .datum(places)
      .attr("d", path)
      .attr("class", "place");
​
  svg.selectAll(".place-label")
      .data(places.geometries)
    .enter().append("text")
      .attr("class", "place-label")
      .attr("transform", function(d) { return "translate(" + projection(d.coordinates) + ")"; })
      .attr("x", function(d) { return d.coordinates[0] > -1 ? 6 : -6; })
      .attr("dy", ".35em")
      .style("text-anchor", function(d) { return d.coordinates[0] > -1 ? "start" : "end"; })
      .text(function(d) { return d.properties.name; });
});
​
</script>
​
    