TopoJSON Points

This example demonstrates encoding a MultiPoint geometry object using TopoJSON.

forked from mbostock's block: TopoJSON Points

<!DOCTYPE html>
<meta charset="utf-8">
<style>

path {
  stroke-linejoin: round;
}

.land {
  fill: #ddd;
}

.states {
  fill: none;
  stroke: #fff;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/queue.v1.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>

var width = 960,
    height = 500;

var projection = d3.geo.albers();

var path = d3.geo.path()
    .projection(projection)
    .pointRadius(1.5);

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

queue()
    .defer(d3.json, "https://gist.githubusercontent.com/mbostock/4090846/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/us.json")
    .defer(d3.json, "airports.json")
    .await(ready);

function ready(error, us, airports) {
  if (error) throw error;

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

svg.append("path")
      .datum(topojson.mesh(us, us.objects.states, function(a, b) { return a !== b; }))
      .attr("class", "states")
      .attr("d", path);

svg.append("path")
      .datum(topojson.feature(airports, airports.objects.airports))
      .attr("class", "points")
      .attr("d", path);
}

</script>

https://d3js.org/d3.v3.min.js

https://d3js.org/queue.v1.min.js

https://d3js.org/topojson.v1.min.js