MapDashboard.js

var width = 960,
    height = 1160;

var formatNumber = d3.format(",.0f");

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

d3.json("uk.json", function(error, uk) {
  if (error) return console.error(error);

var subunits = topojson.feature(uk, uk.objects.subunits);

var projection = d3.geo.albers()
    .center([0, 55.4])
    .rotate([4.4, 0])
    .parallels([50, 60])
    .scale(6000)
    .translate([width / 2, height / 2]);

var path = d3.geo.path()
    .projection(projection);

svg.selectAll(".subunit")
    .data(topojson.feature(uk, uk.objects.subunits).features)
  .enter().append("path")
    .attr("class", function(d) { return "subunit " + d.id; })
    .attr("d", path);

svg.append("path")
  .datum(topojson.feature(uk, uk.objects.subunits))
  .attr("class", "land")
  .attr("d", path);

svg.append("path")
    .datum(topojson.mesh(uk, uk.objects.subunits, function(a, b) { return a !== b; }))
    .attr("class", "border border--state")
    .attr("d", path);

d3.csv

svg.append("g")
    .attr("class", "bubble")
  .selectAll("circle")
    .data(topojson.feature(uk, uk.objects.places).features
      .sort(function(a, b) { return b.properties.population - a.properties.population; }))
  .enter().append("circle")
    .attr("transform", function(d) { return "translate(" + path.centroid(d) + ")"; })
    .attr("r", 2);


var radius = d3.scale.sqrt()
    .domain([0, 1e6])
    .range([0, 15]);

});