WWSD #12: d3 + TopoJSON

Working with spatial data

Example #12

Working with TopoJSON and d3.js projections for mapping geospatial data.

forked from mbostock's block: U.S. Counties TopoJSON

forked from enjalot's block: WWSD #12: d3 + TopoJSON

<!DOCTYPE html>
<meta charset="utf-8">
<style>

path {
  fill: #ccc;
  stroke: #fff;
  stroke-width: .5px;
}

path:hover {
  fill: red;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var width = 960,
    height = 500;

var path = d3.geo.path();

var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
  
var projection = d3.geo.mercator()
	.scale(1800)

var path = d3.geo.path()
    .projection(projection);
  
 d3.json("generalized_trail.geojson", function(error, trails) {
   console.log(trails);
	var extent = d3.extent(trails.features);
   console.log(extent)

// var url = "https://gist.github.com/SwampGuzzler/df630651d2ecab638afbf3e59fb66186"
// d3.json(url, function(error, topology) {
//   console.log('ooh');
//   if (error) throw error;
  
//   console.log("topojson", topology)
//   var geojson = topojson.feature(topology, topology.objects.counties);
//   console.log("geojson", geojson)

svg.selectAll("path")
      .data(trails.features)
    .enter().append("path")
      .attr("d", path)
  		.attr("transform", "translate(3800,1700)")
});

</script>

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