mbostock/.block

## .block
license: gpl-3.0
height: 960
redirect: https://observablehq.com/@d3/raster-vector

## README.md

      
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              README.md
            
          
    Using d3-tile to display raster image tiles underneath some TopoJSON vectors. Compare to the zoomable version.
Tiles copyright OpenStreetMap contributors.

  
## detroit.json

      
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              detroit.json
            
          
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## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>

#streets {
  fill: none;
  stroke: black;
  stroke-width: 1.5px;
  stroke-linejoin: round;
}

</style>
<svg width="960" height="960"></svg>
<script src="//d3js.org/d3.v4.min.js"></script>
<script src="//d3js.org/d3-tile.v0.0.min.js"></script>
<script src="//d3js.org/topojson.v1.min.js"></script>
<script>

var pi = Math.PI,
    tau = 2 * pi;

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

var projection = d3.geoMercator()
    .scale((1 << 18) / tau)
    .translate([width / 2, height / 2])
    .center([-83.15, 42.43]);

var path = d3.geoPath()
    .projection(projection);

d3.json("detroit.json", function(error, detroit) {
  if (error) throw error;

  var tiles = d3.tile()
      .size([width, height])
      .scale(projection.scale() * tau)
      .translate(projection([0, 0]))
      ();

  svg.selectAll("image")
      .data(tiles)
    .enter().append("image")
      .attr("xlink:href", function(d) { return "http://" + "abc"[d[1] % 3] + ".tile.openstreetmap.org/" + d[2] + "/" + d[0] + "/" + d[1] + ".png"; })
      .attr("x", function(d) { return (d[0] + tiles.translate[0]) * tiles.scale; })
      .attr("y", function(d) { return (d[1] + tiles.translate[1]) * tiles.scale; })
      .attr("width", tiles.scale)
      .attr("height", tiles.scale);

  svg.append("path")
      .attr("id", "streets")
      .datum(topojson.mesh(detroit, detroit.objects.detroit))
      .attr("d", path);
});

</script>

## thumbnail.png

      
    Raw
  

              thumbnail.png
	license: gpl-3.0
	height: 960
	redirect: https://observablehq.com/@d3/raster-vector
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	#streets {
	fill: none;
	stroke: black;
	stroke-width: 1.5px;
	stroke-linejoin: round;
	}

	</style>
	<svg width="960" height="960"></svg>
	<script src="//d3js.org/d3.v4.min.js"></script>
	<script src="//d3js.org/d3-tile.v0.0.min.js"></script>
	<script src="//d3js.org/topojson.v1.min.js"></script>
	<script>

	var pi = Math.PI,
	tau = 2 * pi;

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

	var projection = d3.geoMercator()
	.scale((1 << 18) / tau)
	.translate([width / 2, height / 2])
	.center([-83.15, 42.43]);

	var path = d3.geoPath()
	.projection(projection);

	d3.json("detroit.json", function(error, detroit) {
	if (error) throw error;

	var tiles = d3.tile()
	.size([width, height])
	.scale(projection.scale() * tau)
	.translate(projection([0, 0]))
	();

	svg.selectAll("image")
	.data(tiles)
	.enter().append("image")
	.attr("xlink:href", function(d) { return "http://" + "abc"[d[1] % 3] + ".tile.openstreetmap.org/" + d[2] + "/" + d[0] + "/" + d[1] + ".png"; })
	.attr("x", function(d) { return (d[0] + tiles.translate[0]) * tiles.scale; })
	.attr("y", function(d) { return (d[1] + tiles.translate[1]) * tiles.scale; })
	.attr("width", tiles.scale)
	.attr("height", tiles.scale);

	svg.append("path")
	.attr("id", "streets")
	.datum(topojson.mesh(detroit, detroit.objects.detroit))
	.attr("d", path);
	});

	</script>