The Alaska Albers projection. This equal-area projection is also used by the d3.geo.albersUsa composition projection, downsized and inset.
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February 9, 2016 02:03
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Alaska Albers
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .graticule { | |
| fill: none; | |
| stroke: #777; | |
| stroke-width: .5px; | |
| stroke-opacity: .5 | |
| } | |
| .land { | |
| fill: #222; | |
| } | |
| .boundary { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: .5px; | |
| } | |
| </style> | |
| <body> | |
| <script src="//d3js.org/d3.v3.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| // EPSG:3338 | |
| var projection = d3.geo.conicEqualArea() | |
| .scale(1400) | |
| .rotate([154, 0]) | |
| .center([0, 62]) | |
| .parallels([55, 65]) | |
| .clipExtent([[-1, -1], [width + 1, height + 1]]); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var graticule = d3.geo.graticule() | |
| .step([2, 2]); | |
| svg.append("path") | |
| .datum(graticule) | |
| .attr("class", "graticule") | |
| .attr("d", path); | |
| d3.json("/mbostock/raw/4090846/us.json", function(error, us) { | |
| if (error) throw error; | |
| var alaskaState = us.objects.states.geometries.filter(function(d) { return d.id === 2; })[0], | |
| alaskaCounties = us.objects.counties.geometries.filter(function(d) { return d.id / 1000 | 0 === 2; }); | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.feature(us, alaskaState)) | |
| .attr("class", "land") | |
| .attr("d", path); | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.mesh(us, {type: "GeometryCollection", geometries: alaskaCounties})) | |
| .attr("class", "boundary") | |
| .attr("d", path); | |
| }); | |
| </script> |
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