A demo of Mike Bostock’s TopoJSON using states & provinces boundaries from Natural Earth.
With simplification turned on (-s 100), this reduces the original 57MB GeoJSON file to a mere 515KB!
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World Boundaries TopoJSON
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| path { | |
| fill: none; | |
| stroke: #000; | |
| } | |
| .graticule { | |
| fill: none; | |
| stroke: #ccc; | |
| stroke-width: .5px; | |
| } | |
| .foreground { | |
| fill: none; | |
| stroke: #333; | |
| stroke-width: 1.5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="topojson.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var projection = d3.geo.orthographic() | |
| .scale(250) | |
| .clipAngle(90); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var graticule = d3.geo.graticule(); | |
| var λ = d3.scale.linear() | |
| .domain([0, width]) | |
| .range([-180, 180]); | |
| var φ = d3.scale.linear() | |
| .domain([0, height]) | |
| .range([90, -90]); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.on("mousemove", function() { | |
| var p = d3.mouse(this); | |
| projection.rotate([λ(p[0]), φ(p[1])]); | |
| svg.selectAll("path:not(.foreground)").attr("d", path); | |
| }); | |
| svg.append("path") | |
| .attr("class", "graticule") | |
| .datum(graticule) | |
| .attr("d", path); | |
| svg.append("path") | |
| .datum(graticule.outline) | |
| .attr("class", "foreground") | |
| .attr("d", path); | |
| d3.json("readme-world-admin1.json", function(error, topology) { | |
| svg.append("path") | |
| .datum(topojson.mesh(topology)) | |
| .attr("d", path); | |
| }); | |
| </script> |
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| var topojson = { | |
| version: "0.0.1", | |
| mesh: function(topology) { | |
| var kx = topology.transform.scale[0], | |
| ky = topology.transform.scale[1], | |
| dx = topology.transform.translate[0], | |
| dy = topology.transform.translate[1]; | |
| return { | |
| type: "MultiLineString", | |
| coordinates: topology.arcs.map(function(arc) { | |
| var y0 = 0, | |
| x0 = 0; | |
| return arc.map(function(point) { | |
| var x1 = x0 + point[0], | |
| y1 = y0 + point[1]; | |
| x0 = x1; | |
| y0 = y1; | |
| return [x1 * kx + dx, y1 * ky + dy]; | |
| }); | |
| }) | |
| }; | |
| } | |
| }; |
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