D3 Examples - california_wildfires

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.graticule {
  fill: none;
  stroke: #777;
  stroke-width: .5px;
  stroke-opacity: .5
}
​
.land {
  fill: #d3d3d3;
}
​
.fire1 {
  fill: #0000ff;
}
​
.fire2 {
  fill: #ff0000;
}
​
.boundary {
    fill: none;
    stroke: #fff;
    stroke-width: .5px;
}
.legend {
  font-size: 12px;
}
​
​
</style>
<body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script>
<script src="https://d3js.org/topojson.v1.min.js"></script>
<script>
​
var width = 650,
    height = 745;
​
  var color_domain = [750, 1500]
  var ext_color_domain = [750, 1500, 0]
  var legend_labels = ["2000-2013", "1878-1999", "Fire size > 50,000 acres"]
  var color = d3.scale.threshold()
  .domain(color_domain)
  .range(["#ffffff", "#ff0000", "#0000ff"]);
​
var projection = d3.geo.conicEqualArea()
    .scale(1400*2.25)
    .rotate([114, 0])
    .center([0, 39.5])
    .parallels([34, 40.5])
    .clipExtent([[-1, -1], [width + 1, height + 1]]);
   
​
var path = d3.geo.path()
    .projection(projection);
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
var graticule = d3.geo.graticule()
    .step([1, 1]);
​
svg.append("path")
    .datum(graticule)
    .attr("class", "graticule")
    .attr("d", path);
​
//id == 6 for ca
d3.json("us.json", function(error, us) {
  var californiaState = us.objects.states.geometries.filter(function(d) { return d.id === 6; })[0],
      californiaCounties = us.objects.counties.geometries.filter(function(d) { return d.id / 1000 | 0 === 6; });
​
  svg.insert("path", ".graticule")
      .datum(topojson.feature(us, californiaState))
      .attr("class", "land")
      .attr("d", path);
​
  svg.insert("path", ".graticule")
      .datum(topojson.mesh(us, {type: "GeometryCollection", geometries: californiaCounties}))
      .attr("class", "boundary")
      .attr("d", path);
});
​
​
d3.json("pre2000r1.json", function(error, pre2000r1) {
  svg.append("path")
      .datum(topojson.feature(pre2000r1, pre2000r1.objects.pre2000))
      .attr("class", function(d) { return "fire1"; })
      .attr("d", path);
});
​
d3.json("post2000r1.json", function(error, post2000r1) {
  svg.append("path")
      .datum(topojson.feature(post2000r1, post2000r1.objects.post2000))
      .attr("class", function(d) { return "fire2"; })
      .attr("d", path);
});
​
//Addlegend
​
  var legend = svg.selectAll("g.legend")
  .data(ext_color_domain)
  .enter().append("g")
  .attr("class", "legend");
​
  var ls_w = 20, ls_h = 20;
  var pos_h = 85;
  var pos_v = 105;
​
  legend.append("rect")
  .attr("x", pos_h)
  .attr("y", function(d, i){ return height - (i*ls_h) - 2*ls_h-pos_v;})
  .attr("width", ls_w)
  .attr("height", ls_h)
  .style("fill", function(d, i) { return color(d); })
  .style("opacity", 0.8);
​
  legend.append("text")
  .attr("x", pos_h+30)
  .attr("y", function(d, i){ return height - (i*ls_h) - ls_h - 4-pos_v;})
  .text(function(d, i){ return legend_labels[i]; });
</script>
    