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Last active February 12, 2019 15:50
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Azimutal Equal Area
<!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>Polar Azimutal Equal Area Projection</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: #ACAF9F;
stroke-width: 2px;
}
.land {
fill: #E0E4CC;
stroke: #ACAF9F;
stroke-width: 1;
}
.graticule {
fill: none;
stroke: #79A09E;
stroke-width: 1;
}
</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.append('svg');
// Set the size of the SVG element
svg.attr('width', width).attr('height', height);
// Create and configure a geographic projection
var projection = d3.geo.azimuthalEqualArea()
.scale(180)
.clipAngle(180 - 1e2)
.rotate([0, -90])
.translate([width / 2, height / 2]);
// Create and configure a path generator
var pathGenerator = d3.geo.path()
.projection(projection);
// Create and configure the graticule
var graticule = d3.geo.graticule();
// Retrieve the geographic data asynchronously
d3.json('land.geojson', function(err, data) {
// Throw errors on getting or parsing the file
if (err) { throw err; }
// Sphere outline
var sphere = svg.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 = svg.selectAll('path.graticule').data([graticule()]);
lines.enter().append('path').classed('graticule', true);
lines.attr('d', pathGenerator);
lines.exit().remove();
// Land
var land = svg.selectAll('path.land').data([data]);
land.enter().append('path').classed('land', true);
land.attr('d', pathGenerator);
land.exit().remove();
});
</script>
</body>
</html>
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# Download and Transform the 1:50m Country Shapefiles from Natural Earth
# http://www.naturalearthdata.com/downloads/110m-physical-vectors/
URL = http://www.naturalearthdata.com/http//www.naturalearthdata.com/download/110m/physical/ne_110m_land.zip
# Download the zip file from the Natural Earth server
ne_110m_land.zip:
curl -LO $(URL)
# Unzip the shapefiles
ne_110m_land.shp: ne_110m_land.zip
unzip ne_110m_land.zip
touch ne_110m_land.shp
# Convert the shapefiles to GeoJSON
land.geojson: ne_110m_land.shp
ogr2ogr -f GeoJSON land.geojson ne_110m_land.shp
# Convert the GeoJSON file to TopoJSON
land.topojson: countries.json
topojson -p -o land.topojson land.geojson
# Remove source and temporary files
clean:
rm ne_110m_land*
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