TOPOJSON - OK census tract median income

This is a continuation of previous post. This map is a replica of a technique by Mike Bostock, who all love and adoration must go to. Census tracts are from the Census Bureau as well as from their "factfinder" monstrosity. I most likely have messed up the state plane coordinates since this was a practice run. As usual, feel free to contact me with complaints, questions, or hate mail.

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

}

.tract:hover {
		fill: blue;
	}

.tract-border {
		fill: none;
		pointer-events: none;
	}

</style>
<title>Oklahoma Census Tracts</title>
<body>

var formatNumber = d3.format(",d");

var projection = d3.geo.conicConformal().parallels([37 + 34 / 60, 90 + 46 / 60]).rotate([98 + 00 / 60, -35 + 00 / 60]).translate([width / 2, height / 2]);

var color = d3.scale.threshold().domain([5000, 20000, 30000, 40000, 50000, 60000, 100000, 160000]).range(["#FFF7FB", "#ECE7F2", "#D0D1E6", "#A6BDDB", "#74A9CF", "#3690C0", "#0570B0", "#045A8D", "#023858"]);

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

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

d3.json("ok-censustractmedian.json", function(error, ok) {
			var tract = topojson.feature(ok, ok.objects.tract);

projection.scale(1).translate([0, 0]);

var b = path.bounds(tract), s = .95 / Math.max((b[1][0] - b[0][0]) / width, (b[1][1] - b[0][1]) / height), t = [(width - s * (b[1][0] + b[0][0])) / 2, (height - s * (b[1][1] + b[0][1])) / 2];

projection.scale(s).translate(t);

svg.selectAll("path").data(tract.features.filter(function(d) {
				return d.id;
			})).enter().append("path").attr("class", "tract").attr("d", path).attr("fill", function(d) {
				return color(d.properties.median);
			}).append("title").text(function(d) {
				return d.properties.median;
			});

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

d3.select(self.frameElement).style("height", height + "px");

</script>

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

Modified http://d3js.org/topojson.v1.min.js to a secure url

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

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