Created
September 26, 2015 03:56
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Greenland (Centered)
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="utf-8"> | |
<meta http-equiv="X-UA-Compatible" content="IE=edge"> | |
<meta name="viewport" content="width=device-width, initial-scale=1"> | |
<title>Greenland (Centered)</title> | |
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script> | |
</head> | |
<body> | |
<style> | |
body { | |
margin: 0; | |
} | |
.sphere { | |
fill: #A7DBD8; | |
stroke: #79A09E; | |
} | |
.land { | |
fill: #E0E4CC; | |
stroke: #ACAF9F; | |
stroke-width: 1; | |
} | |
.graticule { | |
fill: none; | |
stroke: #79A09E; | |
stroke-width: 1; | |
stroke-dasharray: 1,2; | |
} | |
.overlay { | |
fill-opacity: 0; | |
} | |
#map-container svg { | |
float: left; | |
} | |
</style> | |
<div id="map-container"></div> | |
<script> | |
// Set the dimensions of the map | |
var width = 960, | |
height = 480; | |
// Create a selection for the container div and append the svg element | |
var div = d3.select('#map-container'), | |
svg = div.selectAll('svg').data([0]); | |
svg.enter().append('svg'); | |
// Set the size of the SVG element | |
svg.attr('width', height).attr('height', height); | |
svg.exit().remove(); | |
// Create and configure a geographic projection | |
var projection = d3.geo.mercator() | |
.scale(height / (2 * Math.PI)) | |
.translate([height / 2, height / 2]); | |
// Create and configure a path generator | |
var pathGenerator = d3.geo.path() | |
.projection(projection); | |
// Create and configure the graticule generator (one line every 20 degrees) | |
var graticule = d3.geo.graticule(); | |
// Retrieve the geographic data asynchronously | |
d3.json('greenland.geojson', function(err, data) { | |
// Throw errors on getting or parsing the file | |
if (err) { throw err; } | |
// Create a group to hold the map-related features | |
var grp = svg.selectAll('g.container').data([data, data]); | |
grp.enter().append('g').classed('container', true); | |
grp.exit().remove(); | |
// Sphere | |
var sphere = grp.selectAll('path.sphere').data([{type: 'Sphere'}]); | |
sphere.enter().append('path').classed('sphere', true); | |
sphere.attr('d', pathGenerator); | |
sphere.exit().remove(); | |
// Graticule lines (behind the land) | |
var lines = grp.selectAll('path.graticule').data([graticule()]); | |
lines.enter().append('path').classed('graticule', true); | |
lines.attr('d', pathGenerator); | |
lines.exit().remove(); | |
// Land | |
var land = grp.selectAll('path.land').data([data]); | |
// Compute the feature centroid | |
var centroid = d3.geo.centroid(data); | |
projection.rotate([-centroid[0], -centroid[1]]); | |
land.enter().append('path').classed('land', true); | |
land.attr('d', pathGenerator); | |
land.exit().remove(); | |
}); | |
</script> | |
</body> | |
</html> |
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