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Tobler–Mercator
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| license: gpl-3.0 | |
| height: 960 | |
| border: no | |
| redirect: https://observablehq.com/@d3/tobler-mercator |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .stroke { | |
| fill: none; | |
| stroke: #000; | |
| stroke-width: 3px; | |
| } | |
| .fill { | |
| fill: #fff; | |
| } | |
| .graticule { | |
| fill: none; | |
| stroke: #777; | |
| stroke-width: 0.5px; | |
| stroke-opacity: 0.5; | |
| } | |
| .land { | |
| fill: #222; | |
| } | |
| .boundary { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: 0.5px; | |
| } | |
| </style> | |
| <svg width="960" height="960"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://unpkg.com/topojson-client@3"></script> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"); | |
| var projection = d3.geoProjection(toblerMercatorRaw) | |
| .scale((width - 3) / (2 * Math.PI)) | |
| .translate([width / 2, height / 2]) | |
| .precision(0.1); | |
| var path = d3.geoPath() | |
| .projection(projection); | |
| var graticule = d3.geoGraticule(); | |
| svg.append("defs").append("path") | |
| .datum(graticule.outline()) | |
| .attr("id", "sphere") | |
| .attr("d", path); | |
| svg.append("use") | |
| .attr("class", "stroke") | |
| .attr("xlink:href", "#sphere"); | |
| svg.append("use") | |
| .attr("class", "fill") | |
| .attr("xlink:href", "#sphere"); | |
| svg.append("path") | |
| .datum(graticule) | |
| .attr("class", "graticule") | |
| .attr("d", path); | |
| d3.json("https://unpkg.com/world-atlas@1/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.mesh(world, world.objects.countries, function(a, b) { return a !== b; })) | |
| .attr("class", "boundary") | |
| .attr("d", path); | |
| }); | |
| function toblerMercatorRaw(lambda, phi) { | |
| var cosPhi = Math.cos(phi); | |
| return [lambda * cosPhi * cosPhi, Math.log(Math.tan((Math.PI / 2 + phi) / 2))]; | |
| } | |
| </script> |
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