Available as d3.geo.airy in D3’s extended geographic projections plugin.
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Airy’s Minimum Error
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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: #ddd; | |
| } | |
| .countries { | |
| 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/d3.geo.projection.v0.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 640; | |
| // http://en.wikipedia.org/wiki/ISO_3166-1_numeric | |
| var ids = {840: 1, 484: 1, 124: 1, 630: 1}; | |
| var projection = d3.geo.airy() | |
| .rotate([105, -45]) | |
| .center([-3, 5]) | |
| .scale(560) | |
| .translate([width / 2, height / 2]) | |
| .precision(.1) | |
| .clipAngle(70); | |
| // Compute radius from viewport height. TODO Make automatic. | |
| projection | |
| .radius(projection.invert([width / 2, 0])[1] - projection.invert([width / 2, height])[1]); | |
| var path = d3.geo.path() | |
| .projection(projection); | |
| var graticule = d3.geo.graticule(); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.append("path") | |
| .datum(graticule) | |
| .attr("class", "graticule") | |
| .attr("d", path); | |
| d3.json("/mbostock/raw/4090846/world-50m.json", function(error, world) { | |
| if (error) throw error; | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.feature(world, world.objects.land)) | |
| .attr("class", "land") | |
| .attr("d", path); | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.feature(world, {type: "GeometryCollection", geometries: world.objects.countries.geometries.filter(function(d) { return d.id in ids; })})) | |
| .attr("class", "countries") | |
| .attr("d", path); | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; })) | |
| .attr("class", "boundary") | |
| .attr("d", path); | |
| }); | |
| d3.select(self.frameElement).style("height", height + "px"); | |
| </script> |
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