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POPlotting topojson file with d3.js (NYC boroughs and census tracts)
 

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  1. POPlotting topojson file with d3.js (NYC boroughs and census tracts)
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    <p>here is the first <code>topojson</code> question on so. I am having problems rendering a map (NYC boroughs) and can't figure out why. The code below is just a copy of <a href="http://bl.ocks.org/4108203" rel="nofollow">this example</a> with a different topojson file. I have uploaded the file <a href="http://temp-share.com/show/FHKdqfs16" rel="nofollow">here</a>. Below are also the details about how I created the file. Right now, I am just getting chaotic lines. Probably, the reason is the topojson file but I don't know what's wrong.</p> <p>ps: I was unable to tag this as <code>topojson</code> because the tag has not been used before</p> <p><strong>TopoJSON file</strong></p> <p>1) Download shapefile from <a href="http://www.nyc.gov/html/dcp/html/bytes/dwndistricts.shtml" rel="nofollow">here</a></p> <p>(Under “Borough &amp; Community Districts” the file “Boroughs” (left), ArcView Shapefile)</p> <p>2) Simplify shapefile with QGis</p> <p>3) Convert to TopoJSON with</p> <pre><code>ogr2ogr -f geoJSON nybb-geo.json nybb.shp topojson -o nybb.json nybb-geo.json </code></pre> <p><strong>HTML/JS Code</strong></p> <pre><code>&lt;!DOCTYPE html&gt; &lt;meta charset="utf-8"&gt; &lt;style&gt; .boundary { fill: none; stroke: #000; stroke-width: .5px; } &lt;/style&gt; &lt;body&gt; &lt;script src="http://d3js.org/d3.v3.min.js"&gt;&lt;/script&gt; &lt;script src="http://d3js.org/topojson.v0.min.js"&gt;&lt;/script&gt; &lt;script&gt; var width = 960, height = 500; var path = d3.geo.path(); var svg = d3.select("body").append("svg") .attr("width", width) .attr("height", height); d3.json("/geo/nybb.json", function(error, topology) { svg.append("path") .datum(topojson.object(topology, topology.objects['nybb-geo'].geometries[0])) .attr("d", path) .attr("class", "boundary"); }); &lt;/script&gt; </code></pre>
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