This example choropleth encodes road deaths in the Republic of Ireland in 2010. The data is taken from the Irish Road Safety Authority. Irish geoJSON data based on https://gist.github.com/2183412. Colours by Colorbrewer.
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| var data; // loaded asynchronously | |
| //Albers projection values based on playing with ireland.json using D3's Albers Example | |
| var proj = d3.geo.albers() | |
| .origin([-7.9,53.3]) | |
| .scale(6000) | |
| .translate([450,270]); | |
| var path = d3.geo.path().projection(proj); | |
| var svg = d3.select("#chart") | |
| .append("svg"); | |
| var counties = svg.append("g") | |
| .attr("id", "ireland"); | |
| //Irish geoJSON based on https://gist.github.com/2183412 | |
| d3.json("ireland.json", function(json) { | |
| counties.selectAll("path") | |
| .data(json.features) | |
| .enter().append("path") | |
| .attr("class", "ireland") | |
| .attr("d", path); | |
| }); | |
| d3.json("road-deaths-2010.json", function(json) { | |
| data = json; | |
| counties.selectAll("path") | |
| .attr("class", quantize); | |
| }); | |
| function quantize(d) { | |
| return "q" + Math.min(8, ~~(data[d.properties.id] * 9 / 21)) + "-9"; | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| svg { | |
| background: #fff; | |
| width: 900px; | |
| height: 500px; | |
| } | |
| #ireland path{ | |
| stroke: #fff; | |
| stroke-width: .25px; | |
| } | |
| .q0-9{fill:rgb(247,252,245)} | |
| .q1-9{fill:rgb(229,245,224)} | |
| .q2-9{fill:rgb(199,233,192)} | |
| .q3-9{fill:rgb(161,217,155)} | |
| .q4-9{fill:rgb(116,196,118)} | |
| .q5-9{fill:rgb(65,171,93)} | |
| .q6-9{fill:rgb(35,139,69)} | |
| .q7-9{fill:rgb(0,109,44)} | |
| .q8-9{fill:rgb(0,68,27)} | |
| </style> | |
| <meta http-equiv="Content-Type" content="text/html;charset=utf-8"> | |
| <title>Irish Choropleth Example</title> | |
| <script type="text/javascript" src="http://d3js.org/d3.v2.js"></script> | |
| </head> | |
| <body> | |
| <div id="chart"></div> | |
| <script type="text/javascript" src="choropleth.js"></script> | |
| </body> | |
| </html> |
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| {"Carlow":5, | |
| "Cavan":11, | |
| "Clare":4, | |
| "Cork":18, | |
| "Donegal":19, | |
| "Dublin":21, | |
| "Galway":6, | |
| "Kerry":11, | |
| "Kildare":10, | |
| "Kilkenny":6, | |
| "Laois":9, | |
| "Leitrim":3, | |
| "Limerick":18, | |
| "Longford":2, | |
| "Louth":8, | |
| "Mayo":7, | |
| "Meath":6, | |
| "Monaghan":3, | |
| "Offaly":4, | |
| "Roscommon":9, | |
| "Sligo":3, | |
| "Tipperary":5, | |
| "Waterford":5, | |
| "Westmeath":7, | |
| "Wexford":7, | |
| "Wicklow":5} |
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