Grippe

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <script>
		var width = 700,
  		  height = 580;

var svg = d3.select( "body" )
  		.append( "svg" )
		  .attr( "width", width )
		  .attr( "height", height );

var projection = d3.geoConicConformal().center([2.454071, 46.279229]).scale(2800);

var path = d3.geoPath() // d3.geo.path avec d3 version 3
                 .projection(projection);

d3.csv("GrippeFrance2014.csv", function(data) {
    
    	var color = d3.scaleLinear()
    						.domain([d3.min(data, function(d){return d.somme2014}), d3.max(data, function(d){return d.somme2014})])
                .interpolate(d3.interpolateHcl)
                .range([d3.rgb("#222222"), d3.rgb('#000000')]);
      
      d3.json("regions.json", function(json) {
        //On fusionne les donnees avec le GeoJSON des regions
        for (var i = 0; i < data.length; i++) {
          var region_csv = data[i].region;
          dataValue = parseFloat(data[i].somme2014);
          for (var j = 0; j < data.length; j++) {
            var region_json = json.features[j].properties.nom
            if(region_csv === region_json){
              json.features[j].properties.value = +dataValue;
              console.log(dataValue)
              console.log(json.features[j].properties)
            }
          }
        }

svg.selectAll("path")
           .data(json.features)
           .enter()
           .append("path")
           .attr("d", path);
        
        svg.selectAll("path")
          .style("fill", function(d) {
            var value = d.properties.value;
        		return color(value)
    });
});
      
      
      
      
		});
  </script>
</body>

https://d3js.org/d3.v4.min.js