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Last active October 3, 2016 17:47
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2010 Census Geography with D3 and TopoJSON

Mapping and ID-ing Philadelphia 2010 Census Tracts with D3 and TopoJSON

<!DOCTYPE html>
<meta charset="utf-8">
<style>
path {
fill: #aaa;
stroke: #fff;
stroke-width: .75px;
pointer-events: all;
}
text {
font-family: sans-serif;
font-size: 75px;
color: #aaa;
}
</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script src="http://d3js.org/topojson.v0.min.js"></script>
<script>
var width = 960,
height = 500;
var projection = d3.geo.mercator()
.center([-75.12, 40])
.scale(80000);
var path = d3.geo.path()
.projection(projection);
var svg = d3.select("body").append("svg")
.attr("width", width)
.attr("height", height);
var text = svg.append("text")
.attr("y", height/8)
.attr("text-anchor", "left");
d3.json("tracts.json", function(error, topology) {
svg.selectAll("path")
.data(topojson.object(topology, topology.objects.tracts).geometries)
.enter().append("path")
.attr("class", "tracts")
.attr("id", function(d){return d.id;})
.attr("d", path)
.on("mouseover", function(){d3.select(this).style("fill", "#ff0");
text.text("tract: " + this.id);})
.on("mouseout", function(){d3.select(this).style("fill", "#aaa");
text.text("");});
});
</script>
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