Azimuthal Equidistant Projection

The Azimuthal Equidistant projection is available as d3.geo.azimuthalEquidistant in the geo.projection D3 plugin.

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

.background {
  fill: #a4bac7;
}

.foreground {
  fill: none;
  stroke: #333;
  stroke-width: 1.5px;
}

.graticule {
  fill: none;
  stroke: #fff;
  stroke-width: .5px;
}

.graticule:nth-child(2n) {
  stroke-dasharray: 2,2;
}

.land {
  fill: #d7c7ad;
  stroke: #766951;
}

.boundary {
  fill: none;
  stroke: #a5967e;
}

</style>
<body>
<script src="https://d3js.org/d3.v3.min.js"></script>
<script src="https://cdn.jsdelivr.net/gh/d3/d3-plugins/geo/projection/projection.js"></script>
<script>

var width = 960,
    height = 500;

var path = d3.geo.path()
    .projection(d3.geo.azimuthalEquidistant()
      .translate([width / 2 - .5, height / 2 - .5])
      .clipAngle(90 + 1e-6));

var graticule = d3.geo.graticule()
    .extent([[-90, -90], [90, 90]]);

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

svg.append("path")
    .datum(graticule.outline)
    .attr("class", "background")
    .attr("d", path);

svg.selectAll(".graticule")
    .data(graticule.lines)
  .enter().append("path")
    .attr("class", "graticule")
    .attr("d", path);

svg.append("path")
    .datum(graticule.outline)
    .attr("class", "foreground")
    .attr("d", path);

d3.json("/mbostock/3682676/example/readme-boundaries.json", function(err, collection) {
  svg.insert("g", ".graticule")
      .attr("class", "boundary")
    .selectAll("path")
      .data(collection.geometries)
    .enter().append("path")
      .attr("d", path);
});

d3.json("/mbostock/3682676/example/readme-land.json", function(err, collection) {
  svg.insert("g", ".graticule,.boundary")
      .attr("class", "land")
    .selectAll("path")
      .data(collection.geometries)
    .enter().append("path")
      .attr("d", path);
});

</script>

Modified http://d3js.org/d3.v3.min.js to a secure url

Updated missing url https://raw.github.com/d3/d3-plugins/master/geo/projection/projection.js to https://cdn.jsdelivr.net/gh/d3/d3-plugins/geo/projection/projection.js

Changed ajax call from /d/3682676/readme-boundaries.json to /mbostock/3682676/example/readme-boundaries.json.

Changed ajax call from /d/3682676/readme-land.json to /mbostock/3682676/example/readme-land.json.

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

https://raw.github.com/d3/d3-plugins/master/geo/projection/projection.js