This map of plant hardiness zones shows the average annual extreme minimum temperature (from 1976-2005) across the contiguous United States. Data via Bill Morris’ Open Plant Hardiness Zones project.
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| <script src="http://d3js.org/topojson.v1.min.js"></script> | |
| <script> | |
| var width = 960, | |
| height = 500; | |
| var color = d3.scale.linear() | |
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| .range(["#4575b4", "#ffffbf", "#a50026"]) | |
| .interpolate(d3.interpolateHcl); | |
| var x = d3.scale.linear() | |
| .domain([-40, 40]) | |
| .range([0, 240]); | |
| var xAxis = d3.svg.axis() | |
| .scale(x) | |
| .orient("bottom") | |
| .tickSize(13) | |
| .tickFormat(d3.format("+.0f")); | |
| var canvas = d3.select("body").append("canvas") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var context = canvas.node().getContext("2d"); | |
| var path = d3.geo.path() | |
| .projection(null) | |
| .context(context); | |
| var svg = d3.select("body").append("svg") | |
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| .attr("height", height) | |
| .attr("class", "key") | |
| .append("g") | |
| .attr("transform", "translate(60," + (height - 60) + ")"); | |
| svg.selectAll("rect") | |
| .data(pair(x.ticks(10))) | |
| .enter().append("rect") | |
| .attr("height", 8) | |
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| .attr("width", function(d) { return x(d[1]) - x(d[0]); }) | |
| .style("fill", function(d) { return color(d[0]); }); | |
| svg.call(xAxis).append("text") | |
| .attr("class", "caption") | |
| .attr("y", -6) | |
| .text("Avg. annual extreme minimum temperature, °F"); | |
| d3.json("ophz.json", function(error, ophz) { | |
| topojson.feature(ophz, ophz.objects.b) | |
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| context.beginPath(); | |
| path(d); | |
| context.fill(); | |
| } | |
| </script> |
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