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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- metadata -->
<title>LOD-a-lot</title>
<meta name="description" content="LOD-a-lot democratizes access to the Linked Open Data (LOD) Cloud by serving more than 28 billion unique triples from 650K datasets from a single self-indexed file. This corpus can be queried online with a sustainable Linked Data Fragments interface, or it can be downloaded and consumed locally: LOD-a-lot is easy to deploy and only requires limited resources (524 GB of disk space and 15.7 GB of RAM), enabling web-scale repeatable experimentation and research from a high-end laptop.">
<meta name="author" content="Javier D. Fernández, Wouter Beek, Miguel A. Martínez-Prieto, and Mario Arias">
<!-- favicons -->
<link rel="apple-touch-icon" sizes="57x57" href="img/favicon/apple-icon-57x57.png">
<link rel="apple-touch-icon" sizes="60x60" href="img/favicon/apple-icon-60x60.png">
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<link rel="icon" type="image/png" sizes="16x16" href="img/favicon/favicon-16x16.png">
<!-- style -->
<link rel="manifest" href="img/favicon/manifest.json">
<meta name="msapplication-TileColor" content="#ffffff">
<meta name="msapplication-TileImage" content="img/favicon/ms-icon-144x144.png">
<meta name="theme-color" content="#ffffff">
<link rel="stylesheet" type="text/css" href="css/bootstrap.css">
<link rel="stylesheet" type="text/css" href="fonts/font-awesome/css/font-awesome.css">
<link rel="stylesheet" type="text/css" href="css/style.css">
<link rel="stylesheet" type="text/css" href="css/prettyPhoto.css">
<link href='https://fonts.googleapis.com/css?family=Lato:400,700,900,300' rel='stylesheet' type='text/css'>
<link href='https://fonts.googleapis.com/css?family=Open+Sans:400,700,800,600,300' rel='stylesheet' type='text/css'>
</head>
<body id="page-top" data-spy="scroll" data-target=".navbar-fixed-top">
<!-- header -->
<header id="header">
<div class="intro">
<div class="container">
<div class="row">
<div class="intro-text">
<h1> <span class="name">LOD-a-lot</span></h1>
<p>An indexed and ready-to-consume crawl of a large
portion of the LOD Cloud.</p>
<a href="#aboutLOD-a-lot" class="btn btn-default btn-lg page-scroll">Learn More</a>
</div>
</div>
</div>
</div>
</header>
<!-- navigation -->
<div id="nav">
<nav class="navbar navbar-custom">
<div class="container">
<div class="navbar-header">
<button type="button"
class="navbar-toggle"
data-toggle="collapse"
data-target=".navbar-main-collapse">
<i class="fa fa-bars"></i>
</button>
<a class="navbar-brand page-scroll" href="#page-top">LOD-a-lot</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling. -->
<div class="collapse navbar-collapse navbar-right navbar-main-collapse">
<ul class="nav navbar-nav">
<!-- Hidden li included to remove active class from
about link when scrolled up past about section. -->
<li class="hidden"><a href="#page-top"></a></li>
<li><a class="page-scroll" href="#aboutLOD-a-lot">About</a></li>
<li><a class="page-scroll" href="#achievements">Stats</a></li>
<li><a class="page-scroll" href="#portfolio">Tools</a></li>
<li><a class="page-scroll" href="#contact">Contact</a></li>
</ul>
</div>
</div>
</nav>
</div>
<!-- about -->
<div id="aboutLOD-a-lot">
<div class="container">
<div class="section-title text-center center">
<h2>About</h2>
<hr>
</div>
<div class="row">
<div class="">
<div class="aboutLOD-a-lot-text">
<p>LOD-a-lot democratizes the access to
the <a href="http://lod-cloud.net/">Linked Open Data
(LOD) Cloud</a> by serving more than <strong>28
billion unique triples</strong> from 650K datasets
(collected in <a href="http://lodlaundromat.org/">LOD
Laundromat</a>) from a single
self-indexed <a href="http://www.rdfhdt.org/">HDT</a>
file.
</p>
<p>This corpus can be queried online with a
sustainable <a href="http://linkeddatafragments.org/">Linked
Data Fragments</a> interface, or downloaded and
consumed locally. </p>
<div class="col-md-12 text-center">
<img src="img/LODaLot.jpg" class="img-responsive">
<p><i>LOD-a-lot overview and data flow</i></p>
</div>
<p>LOD-a-lot is easy to deploy and only requires limited
resources (524 GB of disk space and 15.7 GB of RAM),
enabling web-scale repeatable experimentation and
research from a high-end laptop.
</p>
<p class="text-center">
<a class="btn btn-primary" href="docs/lod-a-lot.pdf">
<i class="fa fa-book"></i>
Read the LOD-a-lot paper
</a>
</p>
</div>
</div>
</div>
</div>
</div>
<!-- achievements -->
<div id="achievements" class="text-center">
<div class="container">
<div class="section-title center">
<h2>Some Statistics</h2>
<hr>
</div>
<div class="row">
<div class="col-md-5 col-sm-5 wow fadeInDown" data-wow-delay="200ms">
<div class="achievement-box">
<span class="count">28,362,198,927</span>
<h4>Triples</h4>
</div>
</div>
<div class="col-md-2 col-sm-2 wow fadeInDown" data-wow-delay="400ms">
<div class="achievement-box">
<span class="count">524</span> GBs
<h4>Size</h4>
</div>
</div>
<div class="col-md-2 col-sm-2 wow fadeInDown" data-wow-delay="600ms">
<div class="achievement-box">
<span class="count">15.7</span> GBs
<h4>Memory Footprint</h4>
</div>
</div>
<div class="col-md-2 col-sm-2 wow fadeInDown" data-wow-delay="800ms">
<div class="achievement-box">
<span class="count">144</span> seconds
<h4>Loading Time</h4>
</div>
</div>
</div>
</div>
</div>
<!-- portfolio -->
<div id="portfolio">
<div class="container">
<div class="section-title text-center center">
<h2>Tools</h2>
<hr>
</div>
<div class="categories">
<ul class="cat">
<li>
<ol class="type">
<li><a href="#" data-filter="*" class="active">All</a></li>
<li><a href="#" data-filter=".hdt">HDT</a></li>
<li><a href="#" data-filter=".api">SPARQL Endpoint</a></li>
<li><a href="#" data-filter=".metadata">Metadata</a></li>
</ol>
</li>
</ul>
<div class="clearfix"></div>
</div>
<div class="row">
<div class="portfolio-items">
<div class="col-sm-6 col-md-3 col-lg-3 hdt">
<div class="portfolio-item">
<div class="hover-bg"> <a href="data/LOD_a_lot_v1.hdt" title="Get the HDT file of LOD-a-lot">
<div class="hover-text">
<h4>HDT</h4>
<small>Get the HDT file of LOD-a-lot</small>
</div>
<img src="img/logo-hdt-square.png" class="img-responsive" alt="Project Title"></a>
</div>
</div>
</div>
<div class="col-sm-6 col-md-3 col-lg-3 api">
<div class="portfolio-item">
<div class="hover-bg">
<a href="/ldf"
title="Linked Data Fragments">
<div class="hover-text">
<h4>Linked Data Fragments</h4>
<small>Access the LDF API of LOD-a-lot</small> </div>
<img src="img/ldf.png"
class="img-responsive"
alt="Linked Data Fragments">
</a>
</div>
</div>
</div>
<div class="col-sm-6 col-md-3 col-lg-3 metadata">
<div class="portfolio-item">
<div class="hover-bg">
<a href="VoID.ttl" title="VoID description">
<div class="hover-text">
<h4>VOID description</h4>
<small>Get the VOID Metadata of LOD-a-lot</small>
</div>
<img src="img/rdf_ico.png"
class="img-responsive"
alt="rdf">
</a>
</div>
</div>
</div>
<div class="col-sm-6 col-md-3 col-lg-3 metadata">
<div class="portfolio-item">
<div class="hover-bg">
<a href="http://lodlaundromat.org/" title="LOD Laundromat">
<div class="hover-text">
<h4>LOD Laundromat</h4>
<small>Access the original datasets in LOD Laundromat</small>
</div>
<img src="img/laundry.png" class="img-responsive" alt="rdf">
</a>
</div>
</div>
</div>
</div>
</div>
<p style="font-size:150%">In addition, you
can <a href="/data/LOD_a_lot_v1.hdt.index.v1-1">download the
HDT additional index</a> to speed up SPARQL queries.
</p>
<p style="font-size:150%;margin-top:20px">If you find
LOD-a-lot interesting, please cite this work as
<blockquote>
“Fernández, J. D., Beek, W., Martínez-Prieto, M.A., and
Arias, M. LOD-a-lot: A Queryable Dump of the LOD cloud
(2017). <a href="http://purl.org/HDT/lod-a-lot">http://purl.org/HDT/lod-a-lot</a>.”
</blockquote>
</p>
</div>
</div>
<!-- resume -->
<div id="resume" class="text-center">
<div class="container">
<div class="section-title center">
<h2>Learn more</h2>
<hr>
</div>
<div class="row">
<div class="col-md-4">
<a href="http://www.rdfhdt.org/development/">
<i class="fa fa-code fa-2x"></i>
<h3>How can I access HDT, which libraries are available?</h3>
</a>
</div>
<div class="col-md-4">
<a href="http://linkeddatafragments.org/software/">
<i class="fa fa-cogs fa-2x"></i>
<h3>How can I query Linked Data Fragments?</h3>
</a>
</div>
<div class="col-md-4">
<a href="http://lodlaundromat.org/services/">
<i class="fa fa-flask fa-2x"></i>
<h3>What other services are provided in LOD Laundromat?</h3>
</a>
</div>
</div>
</div>
</div>
<!-- portfolio -->
<div id="supported by">
<div class="container">
<div class="section-title text-center center">
<h2>Thanks to…</h2>
<div class="col-md-4">
<a hreg="http://www.wu.ac.at">
<img src="img/Logo_Wirtschaftsuniversit%C3%A4t_Wien.png">
</a>
</div>
<div class="col-md-4">
<a hreg="http://krr.cs.vu.nl/">
<img src="img/logoVU.png">
</a>
</div>
<div class="col-md-4">
<a hreg="http://www.uva.es">
<img src="img/UVa_logo_color.jpg">
</a>
</div>
<div class="col-md-4">
<a hreg="http://www.ugent.be/">
<img src="img/UGent.jpg">
</a>
</div>
<div class="col-md-8">
<a hreg="https://www.iminds.be/en#">
<img src="img/logo_iminds.png">
</a>
</div>
</div>
</div>
</div>
<!-- contact -->
<div id="contact" class="text-center">
<div class="container">
<div class="section-title center">
<h2>Contact</h2>
<hr>
</div>
Please contact us for any questions, suggestions, or use cases
regarding LOD-a-lot.
<div class="col-md-16 social">
<div class="col-md-6">
<a href="mailto:[email protected]">
<i class="fa fa-envelope-o fa-2x"></i>
</a>
</div>
<div class="col-md-6">
<a href="https://twitter.com/rdfhdt">
<i class="fa fa-twitter fa-2x">
</i>
</a>
</div>
<div class="clearfix">
</div>
</div>
</div>
</div>
<!-- footer -->
<div id="footer">
<div class="container text-center">
<div class="fnav">
<p>Copyright © 2017 Javier D. Fernández, Wouter Beek,
Miguel A. Martínez-Prieto, and Mario Arias</p>
<p>
<small>Picture
by <a href="https://www.flickr.com/photos/esoastronomy/">esoastronomy</a></small>
</p>
</div>
</div>
</div>
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