block by aaizemberg 351d3dc3369db73513ad

Gall-Peters projection

Full Screen

https://gist.github.com/mbostock/3946824

Gall-Peters Projection / The West Wing / 4 min clip

The West Wing episode when cartographers explain that maps distort the relative size of countries.

index.html

<!DOCTYPE html>
<meta charset="utf-8">
<style>
.graticule {
  fill: none;
  stroke: #777;
  stroke-width: .5px;
  stroke-opacity: .5;
}
.land {
  fill: #222;
}
.boundary {
  fill: none;
  stroke: #fff;
  stroke-width: .5px;
}
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script src="//d3js.org/d3.geo.projection.v0.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>
var width = 960,
    height = 610;
var projection = d3.geo.cylindricalEqualArea()
    .parallel(45)
    .scale(216)
    .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-50m.json", function(error, world) {
  if (error) throw error;
  svg.insert("path", ".graticule")
      .datum(topojson.feature(world, world.objects.land))
      .attr("class", "land")
      .attr("d", path);
  svg.insert("path", ".graticule")
      .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; }))
      .attr("class", "boundary")
      .attr("d", path);
});
d3.select(self.frameElement).style("height", height + "px");
</script>