Using d3-tile to display raster image tiles underneath some TopoJSON vectors. Compare to the zoomable version.
Tiles copyright OpenStreetMap contributors.
Last active
March 22, 2019 22:49
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Raster & Vector I
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| license: gpl-3.0 | |
| height: 960 | |
| redirect: https://observablehq.com/@d3/raster-vector |
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| <!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> |
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