| license: gpl-3.0 | |
| height: 960 | |
| border: no |
The Lambert azimuthal equal-area projection is available as d3.geo.azimuthalEqualArea. See also the polar aspect of this projection. This projection is also a special case B = 1 of the Hammer projection.
forked from mbostock's block: Lambert Azimuthal Equal-Area
| <!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="690" height="510"></svg> | |
| <script src="//d3js.org/d3.v4.min.js"></script> | |
| <script src="//d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"); | |
| var projection = d3.geoAzimuthalEqualArea() | |
| .scale(649) | |
| .translate([width / 2, height / 2]) | |
| .precision(0.1); | |
| var lon = -14, lat = 0, clipAngle = 28; | |
| projection | |
| .rotate([-lon,-lat]) | |
| .center([0,0]) | |
| .clipAngle(clipAngle) | |
| .clipExtent([[40,40],[width-40,height-40]]) | |
| ; | |
| var path = d3.geoPath() | |
| .projection(projection); | |
| var graticule = d3.geoGraticule(); | |
| svg.append("defs").append("path") | |
| .datum({type: "Sphere"}) | |
| .attr("id", "sphere") | |
| .attr("d", path); | |
| svg.append("use") | |
| .attr("fill", "lightblue") | |
| .attr("xlink:href", "#sphere"); | |
| svg.append("use") | |
| .attr("stroke", "black") | |
| .attr("fill", "transparent") | |
| .attr("xlink:href", "#sphere"); | |
| svg.append("path") | |
| .datum(graticule) | |
| .attr("class", "graticule") | |
| .attr("d", path); | |
| 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("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); | |
| }); | |
| </script> |