Mapping and ID-ing Philadelphia 2010 Census Tracts with D3 and TopoJSON
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October 3, 2016 17:47
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2010 Census Geography with D3 and TopoJSON
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| <!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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