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connectionmap.html
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<!DOCTYPE html>
<html lang="en">
<head>
<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<script>
(adsbygoogle = window.adsbygoogle || []).push({
google_ad_client: "ca-pub-3523953066677938",
enable_page_level_ads: true
});
</script>
<!-- Global site tag (gtag.js) - Google Analytics -->
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-79254642-6"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'UA-79254642-6');
</script>
<meta charset="utf-8">
<title>Connection map | the D3 Graph Gallery</title>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="description" content="How to build a connection map with Javascript and D3.js: from the most basic example to highly customized examples.">
<meta name="keywords" content="Data,Dataviz,Datavisualization,Javascript,D3,D3.js,area chart">
<meta name="author" content="Yan Holtz">
<link rel="icon" href="img/logo/D3_single_small.png">
<meta property="og:title" content="Area Chart | the D3 Graph Gallery">
<meta property="og:image" content="img/overview_RGG.png">
<meta property="og:description" content="How to build a connection map with Javascript and D3.js: from the most basic example to highly customized examples.">
<!-- Bootstrap core CSS -->
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<!-- Header -->
<header class="masthead" style="padding-top: 150px; padding-bottom: 80px">
<div class="textlanding">
<h1>Connection map</h1>
<hr class="short_hr">
<br>
<ul class="list-inline social-buttons">
<li class="list-inline-item">
<a href="https://twitter.com/R_Graph_Gallery">
<i class="fa fa-twitter"></i>
</a>
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<a href="https://www.linkedin.com/in/yan-holtz-2477534a/">
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<i class="fa fa-home"></i>
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</ul>
<br><br>
<p style="max-width: 700px; margin: auto">A <a href="https://www.data-to-viz.com/story/MapConnection.html">connection map</a> shows the connections between several positions on a map. The link between 2 locations is usually drawn using <u><a href="https://en.wikipedia.org/wiki/Great_circle">great circle</a></u>: the shortest route between them. It results in a rounded line that gives a really pleasant look to the map.</p>
</div>
</header>
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<div id="position_for_images"> </div>
<script>
$(function(){
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});
</script>
<!-- ======================== PORTFOLIO SECTION ============================ -->
<!-- Images must be 480 x 480, resize them with ./script_reformat_img.sh output_name.png -->
<section class="bg" id="portfolio" style="padding-top: 10px">
<div class="container">
<div class="mySeryTitle">Step by step</div>
<hr>
<p>Linking two locations on a map using a straight line would be pretty easy using a classic <code>d3.line()</code> approach. However, <a href="https://en.wikipedia.org/wiki/Great_circle">great circle</a> are more appreciated when it comes to connection map. Fortunately, the function <code>d3.geoPath()</code> makes it a breeze to compute the coordinate of the great circle path. Here are a few examples showing how to use it.</p>
<div id="portfolio-items" class="row">
<div class="col-md-4 col-sm-6 portfolio-item">
<a class="portfolio-link" href="graph/connectionmap_basic.html">
<div class="portfolio-hover">
<div class="portfolio-hover-content">
<p>One unique connection</p>
<hr>
<p class="explanation_portfolio">How to display one unique connection on the map. Just to illustrate how to use d3.geoPath()</p>
</div>
</div>
<img class="img-fluid" src="img/graph/connectionmap_basic.png" alt="">
</a>
</div>
<div class="col-md-4 col-sm-6 portfolio-item">
<a class="portfolio-link" href="graph/connectionmap_multi.html">
<div class="portfolio-hover">
<div class="portfolio-hover-content">
<p>Multi connections</p>
<hr>
<p class="explanation_portfolio">Same idea but applied on several connection. Just shows how to enter in the data to add all connections.</p>
</div>
</div>
<img class="img-fluid" src="img/graph/connectionmap_multi.png" alt="">
</a>
</div>
<div class="col-md-4 col-sm-6 portfolio-item">
<a class="portfolio-link" href="graph/connectionmap_csv.html">
<div class="portfolio-hover">
<div class="portfolio-hover-content">
<p>Input = csv file</p>
<hr>
<p class="explanation_portfolio">Plot a connection map from a list of connection stored in a .csv format. It requires a reformatting step.</p>
</div>
</div>
<img class="img-fluid" src="img/graph/connectionmap_csv.png" alt="">
</a>
</div>
</div>
<br><br><br><br>
<div class="mySeryTitle">Selection of blocks</div>
<hr>
<p>A few blocks with more complicated codes to showcase what's possible to do with connection maps. First show how to display connections on hover. Second show how to apply <a href="bundle.html">edge bundling</a> to the connection to declutter the chart.</p>
<div id="portfolio-items" class="row">
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<div class="portfolio-hover">
<div class="portfolio-hover-content">
<p>Voronoi Arc Map</p>
<hr>
<p class="explanation_portfolio">Highlight flight routes when an airport is hovered.</p>
</div>
</div>
<img class="img-fluid showBlock" src="img/block/block_connectionmapVoronoi.png" alt="Hierarchical edge bundling">
</a>
</div>
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<div class="portfolio-hover">
<div class="portfolio-hover-content">
<p>Flight Paths Edge Bundling</p>
<hr>
<p class="explanation_portfolio">Apply edge bundling technique on a connection map.</p>
</div>
</div>
<img class="img-fluid showBlock" src="img/block/block_connectionmapBundle.png" alt="Hierarchical edge bundling">
</a>
</div>
</div>
</div>
</section>
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<a class="portfolio-link" href="backgroundmap.html">
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