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Identity projection of map in d3.js
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<script src="http://d3js.org/d3.v3.min.js"></script>
</head>
<body>
<div id="vis">
</div>
<script>
var height = 400;
var width = 400;
var vis = d3.select("#vis").append("svg")
.attr("width", width).attr("height", height)
d3.json("po_2012_simplified.json", function(json) {
var projection = d3.geo.projection(function(x, y) { return [x, y];})
.precision(0).scale(1).translate([0, 0]);
var path = d3.geo.path().projection(projection);
var bounds = path.bounds(json),
scale = .95 / Math.max((bounds[1][0] - bounds[0][0]) / width,
(bounds[1][1] - bounds[0][1]) / height),
transl = [(width - scale * (bounds[1][0] + bounds[0][0])) / 2,
(height - scale * (bounds[1][1] + bounds[0][1])) / 2];
projection.scale(scale).translate(transl);
vis.selectAll("path").data(json.features).enter().append("path")
.attr("d", path)
.style("fill", "#D0D0D0")
.style("stroke-width", "0.5px")
.style("stroke", "black")
});
</script>
</body>
</html>
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