In response to Oliver O’Brien’s analysis of Snowden Route Maps. D3’s geographic projection system assumes great-arc segments between points, so it’s easy to build route maps like this.
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| background: #fcfcfa; | |
| } | |
| .stroke { | |
| fill: none; | |
| stroke: #000; | |
| stroke-width: 3px; | |
| } | |
| .fill { | |
| fill: #fff; | |
| } | |
| .graticule { | |
| fill: none; | |
| stroke: #777; | |
| stroke-width: .5px; | |
| stroke-opacity: .5; | |
| } | |
| .land { | |
| fill: #bbb; | |
| } | |
| .boundary { | |
| fill: none; | |
| stroke: #fff; | |
| stroke-width: .5px; | |
| } | |
| .points circle { | |
| fill: #fff; | |
| stroke: red; | |
| stroke-width: 2px; | |
| } | |
| .points text { | |
| font: 11px sans-serif; | |
| text-anchor: middle; | |
| text-shadow: 0 1px 0 #fff, 0 -1px 0 #fff, 1px 0 0 #fff, -1px 0 0 #fff; | |
| } | |
| .route { | |
| fill: none; | |
| stroke: red; | |
| stroke-width: 3px; | |
| } | |
| </style> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script src="http://d3js.org/d3.geo.projection.v0.min.js"></script> | |
| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 570; | |
| var places = { | |
| HNL: [-157 - 55 / 60 - 21 / 3600, 21 + 19 / 60 + 07 / 3600], | |
| HKG: [113 + 54 / 60 + 53 / 3600, 22 + 18 / 60 + 32 / 3600], | |
| SVO: [37 + 24 / 60 + 53 / 3600, 55 + 58 / 60 + 22 / 3600], | |
| HAV: [-82 - 24 / 60 - 33 / 3600, 22 + 59 / 60 + 21 / 3600], | |
| CCS: [-66 - 59 / 60 - 26 / 3600, 10 + 36 / 60 + 11 / 3600], | |
| UIO: [-78 - 21 / 60 - 31 / 3600, 0 + 06 / 60 + 48 / 3600] | |
| }; | |
| var route = { | |
| type: "LineString", | |
| coordinates: [ | |
| places.HNL, | |
| places.HKG, | |
| places.SVO, | |
| places.HAV, | |
| places.CCS, | |
| places.UIO | |
| ] | |
| }; | |
| var projection = d3.geo.orthographic() | |
| .scale(170) | |
| .rotate([-40, 0]) | |
| .translate([width / 2, height / 2]) | |
| .precision(.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("defs").append("path") | |
| .datum({type: "Sphere"}) | |
| .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); | |
| svg.append("path") | |
| .datum(route) | |
| .attr("class", "route") | |
| .attr("d", path); | |
| var point = svg.append("g") | |
| .attr("class", "points") | |
| .selectAll("g") | |
| .data(d3.entries(places)) | |
| .enter().append("g") | |
| .attr("transform", function(d) { return "translate(" + projection(d.value) + ")"; }); | |
| point.append("circle") | |
| .attr("r", 4.5); | |
| point.append("text") | |
| .attr("y", 10) | |
| .attr("dy", ".71em") | |
| .text(function(d) { return d.key; }); | |
| d3.json("/mbostock/raw/4090846/world-50m.json", function(error, world) { | |
| 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); | |
| }); | |
| d3.select(self.frameElement).style("height", height + "px"); | |
| </script> |
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