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Zoomable Treemap of the Chicago Data Portal

A zoomable treemap of the Chicago Data Portal, with the datasets grouped by categories (defined by the portal) and dimensions drawn based on the size of the individual datasets. Currently the color simply helps keep the rectangles distinct, but in future versions information (e.g. # of views the dataset has received, or tags from the portal) could be encoded in a color scale. The rectangles are linked to the datasets they represent in the portal (just click anywhere within the rectangle).

The d3 code is heavily based on code shared by The Ohio State University Department of Political Science. The code for scraping, transforming, and visualizing the data is available in a Data Science for Social Good github repository

<!DOCTYPE html>
<meta charset="utf-8">
<title>Zoomable Treemap of Chicago Data Portal</title>
<style>
#chart {
width: 820px;
height: 700px;
background: #bbb;
margin: 1px auto;
position: relative;
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
text {
pointer-events: none;
}
.grandparent text { /* header text */
font-weight: bold;
font-size: medium;
font-family: "Open Sans", Helvetica, Arial, sans-serif;
}
rect {
fill: none;
stroke: #fff;
}
rect.parent,
.grandparent rect {
stroke-width: 2px;
}
.grandparent rect {
fill: #fff;
}
.children rect.parent,
.grandparent rect {
cursor: pointer;
}
rect.parent {
pointer-events: all;
}
.children:hover rect.child,
.grandparent:hover rect {
fill: #aaa;
}
.textdiv { /* text in the boxes */
font-size: x-small;
padding: 5px;
font-family: "Open Sans", Helvetica, Arial, sans-serif;
}
</style>
<p id="chart">
<script src="http://d3js.org/d3.v2.js"></script>
<script src="http://code.jquery.com/jquery-1.7.1.js"></script>
<script>
/*
* If running inside bl.ocks.org we want to resize the iframe to fit both graphs
* This bit of code was shared originally at https://gist.github.com/benjchristensen/2657838
*/
if(parent.document.getElementsByTagName("iframe")[0]) {
parent.document.getElementsByTagName("iframe")[0].setAttribute('style', 'height: 700px !important');
}
var margin = {top: 20, right: 0, bottom: 0, left: 0},
width = 820,
height = 700 - margin.top - margin.bottom,
formatNumber = d3.format(",d"),
transitioning;
/* create x and y scales */
var x = d3.scale.linear()
.domain([0, width])
.range([0, width]);
var y = d3.scale.linear()
.domain([0, height])
.range([0, height]);
var treemap = d3.layout.treemap()
.children(function(d, depth) { return depth ? null : d.children; })
.sort(function(a, b) { return a.value - b.value; })
.ratio(height / width * 0.5 * (1 + Math.sqrt(5)))
.round(false);
/* create svg */
var svg = d3.select("#chart").append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.bottom + margin.top)
.style("margin-left", -margin.left + "px")
.style("margin.right", -margin.right + "px")
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")")
.style("shape-rendering", "crispEdges");
var color = d3.scale.category20c();
var grandparent = svg.append("g")
.attr("class", "grandparent");
grandparent.append("rect")
.attr("y", -margin.top)
.attr("width", width)
.attr("height", margin.top);
grandparent.append("text")
.attr("x", 6)
.attr("y", 6 - margin.top)
.attr("dy", ".75em");
/* load in data, display root */
d3.json("portaldata.json", function(root) {
initialize(root);
accumulate(root);
layout(root);
display(root);
function initialize(root) {
root.x = root.y = 0;
root.dx = width;
root.dy = height;
root.depth = 0;
}
// Aggregate the values for internal nodes. This is normally done by the
// treemap layout, but not here because of the custom implementation.
function accumulate(d) {
return d.children
? d.value = d.children.reduce(function(p, v) { return p + accumulate(v); }, 0)
: d.value;
}
// Compute the treemap layout recursively such that each group of siblings
// uses the same size (1×1) rather than the dimensions of the parent cell.
// This optimizes the layout for the current zoom state. Note that a wrapper
// object is created for the parent node for each group of siblings so that
// the parent’s dimensions are not discarded as we recurse. Since each group
// of sibling was laid out in 1×1, we must rescale to fit using absolute
// coordinates. This lets us use a viewport to zoom.
function layout(d) {
if (d.children) {
treemap.nodes({children: d.children});
d.children.forEach(function(c) {
c.x = d.x + c.x * d.dx;
c.y = d.y + c.y * d.dy;
c.dx *= d.dx;
c.dy *= d.dy;
c.parent = d;
layout(c);
});
}
}
/* display shows the treemap and writes the embedded transition function */
function display(d) {
/* create grandparent bar at top */
grandparent
.datum(d.parent)
.on("click", transition)
.select("text")
.text(name(d));
var g1 = svg.insert("g", ".grandparent")
.datum(d)
.attr("class", "depth");
/* add in data */
var g = g1.selectAll("g")
.data(d.children)
.enter().append("g");
/* transition on child click */
g.filter(function(d) { return d.children; })
.classed("children", true)
.on("click", transition);
/* write children rectangles */
g.selectAll(".child")
.data(function(d) { return d.children || [d]; })
.enter().append("rect")
.attr("class", "child")
.call(rect)
.append("title")
.text(function(d) { return d.name + " " + formatNumber(d.size); });
/* write parent rectangle */
g.append("rect")
.attr("class", "parent")
.call(rect)
/* open new window based on the json's URL value for leaf nodes */
/* Chrome displays this on top */
.on("click", function(d) {
if(!d.children){
window.open(d.url);
}
})
.append("title")
.text(function(d) { return d.name + " " + formatNumber(d.size); }); /*should be d.value*/
/* Adding a foreign object instead of a text object, allows for text wrapping */
g.append("foreignObject")
.call(rect)
/* open new window based on the json's URL value for leaf nodes */
/* Firefox displays this on top */
.on("click", function(d) {
if(!d.children){
window.open(d.url);
}
})
.attr("class","foreignobj")
.append("xhtml:div")
.attr("dy", ".75em")
.html(function(d) { return d.name;
})
.attr("class","textdiv"); //textdiv class allows us to style the text easily with CSS
/* create transition function for transitions */
function transition(d) {
if (transitioning || !d) return;
transitioning = true;
var g2 = display(d),
t1 = g1.transition().duration(750),
t2 = g2.transition().duration(750);
// Update the domain only after entering new elements.
x.domain([d.x, d.x + d.dx]);
y.domain([d.y, d.y + d.dy]);
// Enable anti-aliasing during the transition.
svg.style("shape-rendering", null);
// Draw child nodes on top of parent nodes.
svg.selectAll(".depth").sort(function(a, b) { return a.depth - b.depth; });
// Fade-in entering text.
g2.selectAll("text").style("fill-opacity", 0);
g2.selectAll("foreignObject div").style("display", "none"); /*added*/
// Transition to the new view.
t1.selectAll("text").call(text).style("fill-opacity", 0);
t2.selectAll("text").call(text).style("fill-opacity", 1);
t1.selectAll("rect").call(rect);
t2.selectAll("rect").call(rect);
t1.selectAll(".textdiv").style("display", "none"); /* added */
t1.selectAll(".foreignobj").call(foreign); /* added */
t2.selectAll(".textdiv").style("display", "block"); /* added */
t2.selectAll(".foreignobj").call(foreign); /* added */
// Remove the old node when the transition is finished.
t1.remove().each("end", function() {
svg.style("shape-rendering", "crispEdges");
transitioning = false;
});
}//endfunc transition
return g;
}//endfunc display
function text(text) {
text.attr("x", function(d) { return x(d.x) + 6; })
.attr("y", function(d) { return y(d.y) + 6; });
}
function rect(rect) {
rect.attr("x", function(d) { return x(d.x); })
.attr("y", function(d) { return y(d.y); })
.attr("width", function(d) { return x(d.x + d.dx) - x(d.x); })
.attr("height", function(d) { return y(d.y + d.dy) - y(d.y); })
.style("background", function(d) { return d.parent ? color(d.name) : null; });
}
function foreign(foreign){ /* added */
foreign.attr("x", function(d) { return x(d.x); })
.attr("y", function(d) { return y(d.y); })
.attr("width", function(d) { return x(d.x + d.dx) - x(d.x); })
.attr("height", function(d) { return y(d.y + d.dy) - y(d.y); });
}
function name(d) {
return d.parent
? name(d.parent) + "." + d.name
: d.name;
}
});
</script>
{
"name": "Chicago Data Portal",
"children": [
{
"name": "FOIA",
"children": [
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Budget-Management/c323-fb2i",
"name": "FOIA Log - Budget & Management",
"size": 104,
"value": 4.6443908991413725
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Business-Affairs-Consumer-Protect/ybhx-inqb",
"name": "FOIA Log - Business Affairs & Consumer Protection",
"size": 3250,
"value": 8.086410275323782
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Compliance/pv55-neb6",
"name": "FOIA Log - Compliance",
"size": 55,
"value": 4.007333185232471
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Cultural-Affairs/npw8-6cq9",
"name": "FOIA Log - Cultural Affairs",
"size": 35,
"value": 3.5553480614894135
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Community-Development/rpya-q7ut",
"name": "FOIA Log - Community Development",
"size": 114,
"value": 4.736198448394496
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Mayor-s-Office-for-People-with-Di/fazv-a8mb",
"name": "FOIA Log - Mayors Office for People with Disabilities",
"size": 6,
"value": 1.791759469228055
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Environment/s7ek-ru5b",
"name": "FOIA Log - Environment",
"size": 1751,
"value": 7.467942332285852
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Fleet-Management/ten5-q8vs",
"name": "FOIA Log - Fleet Management",
"size": 52,
"value": 3.9512437185814275
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Graphics-and-Reproduction-Center/57s6-wkzs",
"name": "FOIA Log - Graphics & Reproduction Center",
"size": 5,
"value": 1.6094379124341003
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Health/4h87-zdcp",
"name": "FOIA Log - Health",
"size": 1440,
"value": 7.272398392570047
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Human-Relations/52q7-yupi",
"name": "FOIA Log - Human Relations",
"size": 73,
"value": 4.290459441148391
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Human-Resources/7zkx-3pp7",
"name": "FOIA Log - Human Resources",
"size": 496,
"value": 6.206575926724928
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Independent-Police-Review-Authori/gzxp-vdqf",
"name": "FOIA Log - Independent Police Review Authority",
"size": 372,
"value": 5.918893854273146
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Law/44bx-ncpi",
"name": "FOIA Log - Law",
"size": 378,
"value": 5.934894195619588
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Revenue/zrv6-shhf",
"name": "FOIA Log - Revenue",
"size": 303,
"value": 5.713732805509369
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Special-Events/kpzx-wx3r",
"name": "FOIA Log - Special Events",
"size": 15,
"value": 2.70805020110221
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Zoning-and-Land-Use-Planning/2nra-kpzu",
"name": "FOIA Log - Zoning & Land Use Planning",
"size": 414,
"value": 6.025865973825314
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Chicago-Public-Library/n379-5uzu",
"name": "FOIA Log - Chicago Public Library",
"size": 41,
"value": 3.713572066704308
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Police/wjkc-agnm",
"name": "FOIA Log - Police",
"size": 14247,
"value": 9.564301637217232
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-City-Clerk/72qm-3bwf",
"name": "FOIA Log - City Clerk",
"size": 407,
"value": 6.008813185442595
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{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Housing-And-Economic-Development/5ztz-espx",
"name": "FOIA Log - Housing & Economic Development",
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"value": 7.331714969726466
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{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Chicago-Police-Board/9pd8-s9t4",
"name": "FOIA Log - Chicago Police Board",
"size": 131,
"value": 4.875197323201151
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Family-and-Support-Services/yfhi-bd8g",
"name": "FOIA Log - Family & Support Services",
"size": 79,
"value": 4.3694478524670215
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Fire/un3c-ixb7",
"name": "FOIA Log - Fire",
"size": 18874,
"value": 9.845540592581278
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Aviation/jbth-h7cm",
"name": "FOIA Log - Aviation",
"size": 416,
"value": 6.030685260261263
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Innovation-and-Technology/4nng-j9hd",
"name": "FOIA Log - Innovation & Technology",
"size": 120,
"value": 4.787491742782046
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-311/j2p9-gdf5",
"name": "FOIA Log - 311",
"size": 597,
"value": 6.391917113392602
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Ethics/fhb6-wwuu",
"name": "FOIA Log - Ethics",
"size": 236,
"value": 5.4638318050256105
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-License-Appeal-Commission/4nkr-n688",
"name": "FOIA Log - License Appeal Commission",
"size": 11,
"value": 2.3978952727983707
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Finance/7avf-ek45",
"name": "FOIA Log - Finance",
"size": 463,
"value": 6.137727054086234
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Buildings/ucsz-xe6d",
"name": "FOIA Log - Buildings",
"size": 69277,
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{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Streets-Sanitation/zpd8-zq4w",
"name": "FOIA Log - Streets & Sanitation",
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"value": 8.605020901781758
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{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Administrative-Hearings/t58s-ja5s",
"name": "FOIA Log - Administrative Hearings",
"size": 3023,
"value": 8.014004994779459
},
{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Procurement-Services/bcyv-67qk",
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{
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{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Transportation/u9qt-tv7d",
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"value": 7.534762657037537
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{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-OEMC/8pxc-mzcv",
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{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Chicago-Treasurer-s-Office/8gyi-fawp",
"name": "FOIA Log - Chicago Treasurers Office",
"size": 40,
"value": 3.6888794541139363
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{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Animal-Care-and-Control/b989-387c",
"name": "FOIA Log - Animal Care & Control",
"size": 1727,
"value": 7.454141078146678
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{
"url": "https://data.cityofchicago.org/dataset/CTA-Performance-Unscheduled-Days-Off/spus-59r8",
"name": "CTA - Performance - Unscheduled Days Off",
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{
"url": "https://data.cityofchicago.org/dataset/CTA-Performance-Bus-Runs-Held-Due-to-Absenteeism-2/t58d-f8en",
"name": "CTA - Performance - Bus Runs Held Due to Absenteeism (2011- Jan-Aug)",
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{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Fleet-Facility-Management/nd4p-ckx9",
"name": "FOIA Log - Fleet & Facility Management",
"size": 85,
"value": 4.442651256490317
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{
"url": "https://data.cityofchicago.org/FOIA/FOIA-Request-Log-Cultural-Affairs-Special-Events/ikdf-ernx",
"name": "FOIA Log - Cultural Affairs & Special Events",
"size": 41,
"value": 3.713572066704308
}
]
},{
"name": "Transportation",
"children": [
{
"url": "https://data.cityofchicago.org/Transportation/Average-Daily-Traffic-Counts/pfsx-4n4m",
"name": "Average Daily Traffic Counts",
"size": 1279,
"value": 7.153833801578843
},
{
"url": "https://data.cityofchicago.org/Transportation/Chicago-Street-Names/i6bp-fvbx",
"name": "Chicago Street Names",
"size": 2582,
"value": 7.856319571406588
},
{
"url": "https://data.cityofchicago.org/Transportation/Bike-Racks/cbyb-69xx",
"name": "Bike Racks",
"size": 5164,
"value": 8.549466751966532
},
{
"url": "https://data.cityofchicago.org/Transportation/CTA-System-Information-List-of-L-Stops/8pix-ypme",
"name": "CTA - System Information - List of L Stops",
"size": 298,
"value": 5.697093486505405
},
{
"url": "https://data.cityofchicago.org/Transportation/CTA-Ridership-Bus-Routes-Monthly-Day-Type-Averages/bynn-gwxy",
"name": "CTA - Ridership - Bus Routes - Monthly Day-Type Averages & Totals",
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"value": 9.958922259424229
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{
"url": "https://data.cityofchicago.org/Transportation/CTA-Ridership-L-Station-Entries-Monthly-Day-Type-A/t2rn-p8d7",
"name": "CTA - Ridership - L Station Entries - Monthly Day-Type Averages & Totals",
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{
"url": "https://data.cityofchicago.org/Transportation/CTA-Ridership-Bus-Routes-Daily-Totals-by-Route/jyb9-n7fm",
"name": "CTA - Ridership - Bus Routes - Daily Totals by Route",
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},
{
"url": "https://data.cityofchicago.org/Transportation/CTA-Ridership-L-Station-Entries-Daily-Totals/5neh-572f",
"name": "CTA - Ridership - L Station Entries - Daily Totals",
"size": 639134,
"value": 13.36786941403555
},
{
"url": "https://data.cityofchicago.org/Transportation/CTA-Ridership-Annual-Boarding-Totals/w8km-9pzd",
"name": "CTA - Ridership - Annual Boarding Totals",
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"value": 3.2188758248682006
},
{
"url": "https://data.cityofchicago.org/Transportation/CTA-Ridership-Avg-Weekday-Bus-Stop-Boardings-in-Oc/mq3i-nnqe",
"name": "CTA - Ridership - Avg. Weekday Bus Stop Boardings in October 2012",
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{
"url": "https://data.cityofchicago.org/Transportation/CTA-Ridership-Daily-Boarding-Totals/6iiy-9s97",
"name": "CTA - Ridership - Daily Boarding Totals",
"size": 4535,
"value": 8.419580362549237
},
{
"url": "https://data.cityofchicago.org/Transportation/Towed-Vehicles/ygr5-vcbg",
"name": "Towed Vehicles",
"size": 5937,
"value": 8.688959234270676
},
{
"url": "https://data.cityofchicago.org/Transportation/Relocated-Vehicles/5k2z-suxx",
"name": "Relocated Vehicles",
"size": 3876,
"value": 8.262558973010657
},
{
"url": "https://data.cityofchicago.org/Transportation/Street-Closure-Permits-Current/avwc-kf7i",
"name": "Street Closure Permits - Current",
"size": 108,
"value": 4.68213122712422
},
{
"url": "https://data.cityofchicago.org/Transportation/Chicago-Traffic-Tracker-Congestion-Estimates-by-Se/n4j6-wkkf",
"name": "Chicago Traffic Tracker - Congestion Estimates by Segments",
"size": 1257,
"value": 7.136483208590247
},
{
"url": "https://data.cityofchicago.org/Transportation/Chicago-Traffic-Tracker-Congestion-Estimates-by-Re/t2qc-9pjd",
"name": "Chicago Traffic Tracker - Congestion Estimates by Regions",
"size": 29,
"value": 3.367295829986474
},
{
"url": "https://data.cityofchicago.org/Transportation/Public-Right-of-Way-Use-Permits/hwmb-iu8j",
"name": "Public Right-of-Way Use Permits",
"size": 505242,
"value": 13.132792801394842
},
{
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