Module 4

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Map made with d3.js</title>
		<script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
		<style type="text/css">
			
			body {
				background-color: #eeeeee;
				font-family: Helvetica, Arial, sans-serif;
			}

h1 
            {font-family: sans-serif;
             font-weight: 100;
             font-size: 20px;
             color: #92CC50;
             padding-left: 50px; 
            } 
            
			p 
            {font-family: sans-serif;
             font-weight: 100;
             font-size: 11px;
             padding-left: 50px; 
                 line-height: 15px;
               
            } 
             
            a:link {
				text-decoration: none;
				color: #92CC50;
			}

a:hover {
				text-decoration: underline;
			}

a:visited {
				color: #92CC50;
			}

a:active {
				color: #92CC50;
			}
        
                                 
            text 
            {font-family: sans-serif;
             font-size: 9px;
            }
            
            svg {
				background-color: white;
			}
            
            #container {
				width: 600px;
				margin-left: auto;
				margin-right: auto;
				margin-top: 25px;
				padding: 25px;
				background-color: white;
				box-shadow: 1px 1px 1px 1px #ccc;  
            }

path {
			
               stroke: white;
                stroke-width: 0.5;
               fill: #F4E7D3;
			}
            
          
		</style>

</head>

<body>
		
<div id="container">
		  <h1>Swift nests in the city of Utrecht</h1>
          <p>This map shows the amount of Swift nests counted in 2014 in relation to the amount of urbanisation. </p><p>Dark neighbourhoods are highly urbanized, light neighbourhoods are less urbanized.</p>
    
    <p>Bron: <a href="https://opendata.utrecht.nl/dataset/resultaten-gierzwaluwinventarisatie-2014">Gemeente Utrecht</a>, 2015</p>
        </div>
   
        <script type="text/javascript">

//Width and height
			var w = 600;
			var h = 500;

//Define map projection
			var projection = d3.geo.mercator()
								  .center([ 5, 53])
								  .translate([ w/2-180, -2900 ])
								   .scale([ 120000 ]);
								   
//Define path generator
			var path = d3.geo.path()
							 .projection(projection);

//Create SVG
            var svg = d3.select("#container")
						.append("svg")
						.attr("width", w)
						.attr("height", h);

//Load in GeoJSON data
			d3.json("7.json", function(json) {
				
//Bind data and create one path per GeoJSON feature
             svg.selectAll("path")
                   .data(json.features)
				   .enter()
				   .append("path")
				   .attr("d", path)
                //  .style("fill", "grey")
             
             
             .style("fill", function(d) {

//Get data value
							//var value = d.properties.STED;

if (d.properties.STED <= 1) {return "#C1A080"}
                            if (d.properties.STED <= 2) {return "#D6BD9F"}
							if (d.properties.STED <= 3) {return "#E0CFB8"}
							if (d.properties.STED <= 4) {return "#F4E7D3"}	
                            if (d.properties.STED <= 5) {return "#F9F4ED"}
                                    
							else {
								//If value is undefined…
								return "#ccc";
							}

});
            
                //Load in zwaluw data
					d3.csv("zwaluw.csv", function(data) {
						
						//Create a circle for each nest
						svg.selectAll("circle")
						   .data(data)
						   .enter()
						   .append("circle")
						   .attr("cx", function(d) {
						   	   //[0] returns the first coordinate (x) of the projected value
							   return projection([d.lon, d.lat])[0];
						   })
						   .attr("cy", function(d) {
						   	   //[1] returns the second coordinate (y) of the projected value
							   return projection([d.lon, d.lat])[1];
						   })
						   .attr("r", function(d) {
						   	   //Use Math.sqrt to scale by area (not radius)
							return   (d.aantal*2)
                            // return Math.sqrt(+d.aantal / w * 10);
						   })
                         //.attr("r", 5)
						   .style("fill", "green")
						   .style("opacity", 0.5);
						
					
                     svg.selectAll("circle")
						   .append("title")
					       .text(function(d) {
						      return d.aantal+ " nests";
					       });
                    
                    });
                
                         
                
                
			});
            
           
            
		</script>
	</body>
</html>

Modified http://d3js.org/d3.v3.js to a secure url

https://d3js.org/d3.v3.js