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{"type":"MultiPolygon","coordinates":[[[[-155.59,20.14],[-155.58,20.13],[-155.57,20.13],[-155.56,20.14],[-155.55,20.14],[-155.53,20.14],[-155.49,20.11],[-155.45,20.11],[-155.34,20.06],[-155.21,20],[-155.17,19.97],[-155.09,19.88],[-155.08,19.87],[-155.08,19.84],[-155.08,19.77],[-155.07,19.74],[-155.06,19.74],[-155.02,19.75],[-154.99,19.74],[-154.98,19.73],[-154.98,19.72],[-154.97,19.67],[-154.96,19.65],[-154.92,19.61],[-154.87,19.59],[-154.79,19.54],[-154.8,19.52],[-154.81,19.5],[-154.82,19.48],[-154.83,19.46],[-154.91,19.42],[-154.92,19.41],[-155.01,19.33],[-155.02,19.33],[-155.05,19.32],[-155.07,19.32],[-155.1,19.3],[-155.17,19.28],[-155.19,19.28],[-155.27,19.28],[-155.29,19.27],[-155.3,19.27],[-155.32,19.25],[-155.35,19.22],[-155.37,19.22],[-155.38,19.21],[-155.4,19.2],[-155.42,19.18],[-155.44,19.17],[-155.49,19.14],[-155.5,19.14],[-155.55,19.1],[-155.55,19.08],[-155.57,19.03],[-155.61,18.97],[-155.63,18.96],[-155.64,18.95],[-155.66,18.93],[-155.67,18.93],[-155.67,18.94],[-155.69,18.96],[-155.71,18.99],[-15

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A demo of Mike Bostock’s TopoJSON using states & provinces boundaries from Natural Earth.

With simplification turned on (-s 100), this reduces the original 57MB GeoJSON file to a mere 515KB!

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Stress test for antemeridian cutting!

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Climatologist Irving I. Gringorten published this little-known equal-area projection in 1972.

It is available as d3.geo.gringorten in the geo.projection D3 plugin.

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D3 2.11’s projections will adaptively resample to reduce local distortion of lines. Move the mouse to change the precision, and drag to change the aspect.

Update: Mike has made some awesome improvements!

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Testing the new antemeridian cutting in the d3.geo.projection plugin.

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A modified version of Mike Bostock’s mesmerising stereographic projection example.

A NASA Blue Marble raster image is reprojected using d3.geo.stereographic().invert from the geo.projection D3 plugin.

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The Peirce quincuncial projection can be constructed using d3.geo.guyou from the geo.projection D3 plugin.

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Rotating Guyou hemispheres.

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The Guyou projection is available as d3.geo.guyou in the geo.projection D3 plugin.