Assignment 7-Raster & Vector I

Using d3-tile to display raster image tiles underneath some TopoJSON vectors. Compare to the zoomable version.

Tiles copyright OpenStreetMap contributors.

forked from mbostock's block: Raster & Vector I

<!DOCTYPE html>
<meta charset="utf-8">
<title>class-07 demo</title><style>

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

</style>
<svg width="960" height="500"></svg>

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

var projection = d3.geoMercator()
    .scale((1 << 15) / tau)
     .center([-97.0929, 35.0078]);

var path = d3.geoPath()
.pointRadius(3)
    .projection(projection);

var Oklahoma = "https://raw.githubusercontent.com/deldersveld/topojson/master/countries/us-states/OK-40-oklahoma-counties.json"

d3.json(Oklahoma, function(error, Oklahoma) {
  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 "https://" + "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);

});
  
  //Earthquake map
var base = "https://gist.githubusercontent.com/pbogden/935370a5272acff2618b/raw/f4d102d819066bb21a0021b4cbab6502e86bf587/";
  var usgs = "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_week.geojson";

// Read and plot the earthquake data
var url = base + "quakes.json";
d3.json(url, plotQuakes);
//d3.json(usgs, plotQuakes);
  
  // Read and plot the state & county boundaries  
d3.json(base + "ok.json", plotState);
function plotQuakes(error, json) {
  if (error) console.log(error);
  
  // Assign the json to a global so we can manipulate it in the console
  data = json;
  
  // Filter the small earthquakes
  var features = data.features.filter(function(d) { return (+ d.properties.mag >= smallest) });
  
  var layer2 = svg.append("g");
     
  // Plot the earthquakes
layer2.selectAll("path.quake")
      .data(features)
    .enter().append("path")
      .attr("class", "quake")
      .attr("d", path)
}
function plotState(error, ok) {
  if (error) console.log(error);
  
  var objects = ok.objects.ok;
  var all = topojson.merge(ok, objects.geometries);
  var layer1 = svg.append("g");
layer1.append("path")
      .datum(all)
      .attr("class", "state")
      .attr("d", path);
  
layer1.append("path")
      .datum(topojson.mesh(ok, objects, function(a, b) { return a !== b; }))
      .attr("class", "county-border")
      .attr("d", path);
 }
  
  
</script>
  
</body>

</script>

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

https://d3js.org/d3-tile.v0.0.min.js

https://d3js.org/topojson.v2.min.js