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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September 12, 2016 16:52
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Snowden’s Route
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license: gpl-3.0 |
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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="//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 = 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.kavrayskiy7() | |
.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) { | |
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); | |
}); | |
d3.select(self.frameElement).style("height", height + "px"); | |
</script> |
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