Created
September 26, 2015 04:29
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Greenland Scaled
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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(); | |
| // Compute the feature centroid | |
| var centroid = d3.geo.centroid(data), | |
| bounds = d3.geo.bounds(data); | |
| // Compute the angular distance between bound corners | |
| var distance = d3.geo.distance(bounds[0], bounds[1]), | |
| scale = height / distance; | |
| // Sets the scale and rotates the projection | |
| projection | |
| .scale(scale) | |
| .rotate([-centroid[0], -centroid[1]]); | |
| // 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]); | |
| land.enter().append('path').classed('land', true); | |
| land.attr('d', pathGenerator); | |
| land.exit().remove(); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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