In “Selecting a Map Projection” (Sep. 2012), the National Geographic presented an ocean-centric aspect of an interrupted Mollweide projection.
See also Interrupted Homolosine Oceans.
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February 22, 2019 22:38
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Interrupted Mollweide Oceans
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| license: gpl-3.0 | |
| border: no | |
| height: 484 |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| .stroke { | |
| fill: none; | |
| stroke: #000; | |
| stroke-width: 3px; | |
| } | |
| .fill { | |
| fill: #b7ccbb; | |
| } | |
| .graticule { | |
| fill: none; | |
| stroke: #777; | |
| stroke-width: 0.5px; | |
| stroke-opacity: 0.5; | |
| } | |
| .land { | |
| fill: #fff; | |
| } | |
| .boundary { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: 0.5px; | |
| } | |
| </style> | |
| <svg width="960" height="484"></svg> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/d3-geo-projection.v2.min.js"></script> | |
| <script src="https://d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"); | |
| var lobes = [ | |
| [ | |
| [[-180, 0], [-130, 90], [-90, 5]], | |
| [[-90, 5], [-30, 90], [60, 5]], | |
| [[60, 5], [120, 90], [180, 0]] | |
| ], | |
| [ | |
| [[-180, 0], [-120, -90], [-60, -5]], | |
| [[-60, -5], [20, -90], [90, -5]], | |
| [[90, -5], [140, -90], [180, 0]] | |
| ] | |
| ]; | |
| var projection = d3.geoInterrupt(d3.geoMollweideRaw, lobes) | |
| .rotate([-200, 0]) | |
| .fitExtent([[10,10], [width-30, height-10]], {type: "Sphere"}); | |
| var graticule = d3.geoGraticule(); | |
| var path = d3.geoPath() | |
| .projection(projection); | |
| var defs = svg.append("defs"); | |
| defs.append("path") | |
| .datum({type: "Sphere"}) | |
| .attr("id", "sphere") | |
| .attr("d", path); | |
| defs.append("clipPath") | |
| .attr("id", "clip") | |
| .append("use") | |
| .attr("xlink:href", "#sphere"); | |
| 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("clip-path", "url(#clip)") | |
| .attr("d", path); | |
| var marker = svg.append("path") | |
| .attr("fill", "red") | |
| svg.on('mousemove', function() { | |
| var mouse = d3.mouse(this); | |
| marker.attr("d", path({type:"Point", coordinates: projection.invert(mouse)})); | |
| }); | |
| d3.json("https://gist.githubusercontent.com/mbostock/4090846/raw/d534aba169207548a8a3d670c9c2cc719ff05c47/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("clip-path", "url(#clip)") | |
| .attr("d", path); | |
| svg.insert("path", ".graticule") | |
| .datum(topojson.mesh(world, world.objects.countries, function(a, b) { return a !== b; })) | |
| .attr("class", "boundary") | |
| .attr("clip-path", "url(#clip)") | |
| .attr("d", path); | |
| }); | |
| </script> |
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