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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Spatial data interpolation</title>
<meta name="description" content="SeaDataCloud 2nd User Workshop 💻">
<meta name="author" content="Charles Troupin">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
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</head>
<div id="myLogo" style="background: url("images/logo_uliege.jpeg");
position: absolute;
bottom: 100px;
right: 100px;
width: 100px;
height: 100px;"></div>
<body>
<div class="reveal">
<div class="slides">
<section>
<section class="center">
<h2 style="margin-bottom:1cm">2nd On-line SeaDataCloud User Workshop<br>
Hi-Tech to High Knowledge</h2>
<h3 style="margin-bottom:3cm"> Data interpolation: what can we do {for, with} you?</h3>
<p><img src="images/logo_gher.png" height="100px"/>
<img src="images/logo_uliege.jpeg" height="100px"/>
<img src="images/logo_seadatacloud.png" height="100px"/>
</p>
<p style="color:#858585;"> C. Troupin, A. Barth, J.-M. Beckers & the VRE team</p>
</section>
</section>
<section>
<section class="center">
<h1>What is DIVA <i class="fas fa-question-circle"></i></h1>
</section>
<section class="center">
<p><b>D</b>ata<br>
<b>I</b>nterpolating<br>
<b>V</b>ariational<br>
<b>A</b>nalysis
<p/>
<p><img src="images/diva_logo.png" height="200px"/></p>
🔧 Software tool to interpolate in situ observations
</section>
<section class="center">
<h1>What do we mean by<br>"interpolation" <i class="fas fa-question-circle"></i></h1>
</section>
<section class="center">
<p>Getting gridded fields from sparse, in situ data ⤵️ </p>
<p><img src="images/Diva_gridding_canary.png" height="350px"/></p>
<p>
(≃ getting information where we don't have measurements)
</p>
</section>
<section class="center">
<h1>Why interpolation<br> in oceanography 🌊<br>
is challenging <i class="fas fa-question-circle"></i></h1>
</section>
<section>
<img src="images/ODV_Arctic1.png" height="450px"/>
<ol>
<li class="fragment">A large (huge) amount of data points available</li>
<li class="fragment">Regions without any observation</li>
<li class="fragment">Physical obstacles: the topography</li>
<li class="fragment">Multi-dimensional: longitude, latitude, depth and time</li>
</ol>
</section>
<section class="center">
<h1>How does DIVA work <i class="fas fa-question-circle"></i></h1>
</section>
<section>
<h3>1. Observations influence their neighbourhood<br> over a certain distance</h3>
<img src="images/diva_schema1.png" height="450px"/>
</section>
<section>
<h3>2. Observations are assigned a certain weigh,<br>
translating the confidence of the measurement</h3>
<img src="images/diva_schema2.png" height="450px"/>
</section>
<section>
<h3>3. The tool minimises a <b>cost function</b> taking into account:</h3>
<ul>
<li>The <i>distance</i> between observation and analysis</li>
<li>The <i>regularity</i> (or <i>smoothness</i>) of the interpolated field</li>
</ul>
<img src="images/diva_schema3a.png" height="450px"/>
</section>
<section data-background-iframe="maps/BalticSalinity.html" data-background-interactive>
</section>
</section>
<section>
<!-- This is a comment
<section data-background-iframe="diva_timeline.html" data-background-interactive>
</section>
-->
<section class="center">
<h1>Implementation:<br>DIVAnd vs. DIVA</h1>
</section>
<section class="center">
<h2>DIVA (1991-2016) aka <i>DIVA classic</i></h2>
<p>
<img src="images/596px-Diva46.png" height="250px"/>
</p>
<ul>
<li>Interpolation in <b>2</b> dimensions,
based on a finite-element solver</li>
<li><i class="fas fa-code"></i> Coded in <b>Fortran</b> 77 and 95</li>
<li>Not developed anymore, except bug fixes <i class="fas fa-bug"></i></li>
</ul>
<p>
<i class="fab fa-github"></i>
<a href="https://github.com/gher-ulg/DIVA">https://github.com/gher-ulg/DIVA</a>
<img src="https://zenodo.org/badge/80114691.svg" style="vertical-align:middle"/> <br>
</p>
</section>
<section class="center">
<h2>DIVAnd (2014-), alias the <i>new DIVA</i></h2>
<p>
<img src="images/divand_logo00.png" height="200px"/>
</p>
<ul>
<li>Interpolation in <n>n</b> dimensions (n=2, 3, 4, ...)</li>
<li><i class="fas fa-code"></i> Coded in <b>Julia</b> </li>
<li>≠ not a new release of DIVA</li>
</ul>
<p>
<i class="fab fa-github"></i>
<a href="https://github.com/gher-ulg/DIVAnd.jl">https://github.com/gher-ulg/DIVAnd.jl</a>
<img src="https://zenodo.org/badge/79277337.svg" style="vertical-align:middle"/> <br>
</p>
</section>
<section>
<h2>Why Julia <i class="fas fa-question-circle"></i></h2>
<img src="images/juliahome.png" height="250px"/>
<p><i class="fas fa-bolt"></i> Fast, high-level, dynamic language</p>
<p><i class="far fa-calendar-alt"></i> Started in 2012 | Now at version 1.5.1</p>
<p><i class="fas fa-unlock-alt"></i> Open source | ↗️ growing user community</p>
</section>
<section>
<h2>Why Julia <i class="fas fa-question-circle"></i></h2>
<img src="images/juliapaper2.jpg" height="350px"/><br>
<a href="https://www.nature.com/articles/d41586-019-02310-3"><i class="fas fa-link"></i> https://www.nature.com/articles/d41586-019-02310-3</a>
</section>
</section>
<section>
<section class="center">
<h1> How to run & use<br>DIVAnd <i class="fas fa-question-circle"></i></h1>
</section>
<section class="center">
<h2>Install Julia and download the code</h2>
<img class="plain" src="images/divand_github.png" height="340px"><br>
<i class="fab fa-github"></i>
<a href="https://github.com/gher-ulg/DIVAnd.jl">https://github.com/gher-ulg/DIVAnd.jl</a>
<img src="https://zenodo.org/badge/79277337.svg" style="vertical-align:middle"/> <br>
</section>
<section>
<h2>DIVA (2D) within Ocean Data View</h2>
<a href="http://odv.awi.de/"><i class="fas fa-link"></i> http://odv.awi.de/</a><br>
<p class="fragment step-fade-in-then-out"><img class="plain" src="images/odvdiva2.png" height="450px"></p>
<p class="fragment step-fade-in-then-out"><img class="plain" src="images/salinity_ODV2.png" height="450px"></p>
</section>
<section class="center">
<h2>DIVA-on-Web (2D)</h2>
<a href="http://ec.oceanbrowser.net/emodnet/diva.html"><i class="fas fa-link"></i> http://ec.oceanbrowser.net/emodnet/diva.html</a><br>
<img class="plain" src="images/divaonweb.png" height="450px">
</section>
<section>
<h2>Jupyter notebooks as user guidelines</h2>
<img class="plain" src="images/divaworkshops.png" height="450px"><br>
<i class="fab fa-github"></i> <a href="https://github.com/gher-ulg/Diva-Workshops/">https://github.com/gher-ulg/Diva-Workshops/</a>
<img src="images/zenodo.3769037.png "style="vertical-align:middle"/> <br>
</section>
<section>
<h2>Jupyter notebooks inside<br> the Virtual Research Environment</h2>
<p class="fragment step-fade-in-then-out"><img class="plain" src="images/vre01.png" height="450px"></p>
<p class="fragment step-fade-in-then-out"><img class="plain" src="images/vre02.jpg" height="450px"></p>
<p class="fragment step-fade-in"><img class="plain" src="images/vre03.jpg" height="450px"></p>
</section>
<section>
<h2>Further deployments <i class="fas fa-rocket"></i></h2>
<div class="row">
<div class="column">
Docker container<br>
<img src="images/logo/logo_docker.png" height="100px"/><br>
Used in the Virtual Research Environment
</div>
<div class="column"></div>
Singularity container<br>
<img src="images/logo/logo_singularity.png" height="100px"/><br>
Under development in the <a href="https://www.phidias-hpc.eu/">PHIDIAS project</a> (HPC)
</div>
</section>
</section>
<section>
<section class="center">
<h1>Who's using it <i class="fas fa-question-circle"></i></h1>
</section>
<section class="center">
<h3>SeaDataCloud regional leaders</h3>
<p> Regional climatologies for temperature and salinity</p>
<a href="https://www.seadatanet.org/Products/Climatologies"><i class="fas fa-link"></i> https://www.seadatanet.org/Products/Climatologies</a>
<img class="plain" src="images/fig07b_winter_salinity_100.png" height="300px"><br>
</section>
<section class="center">
<h3>EMODnet Chemistry regional leaders</h3>
<p>Gridded fields of nutrient concentrations</p>
<a href="http://www.emodnet-chemistry.eu/products"><i class="fas fa-link"></i> http://www.emodnet-chemistry.eu/products</a><br>
<img class="plain" src="images/EMODnet_data_domains02.png" height="450px">
</section>
<section class="center">
<h3>EMODnet Biology</h3>
<p> Creation of specific abundance products</p>
<a href="http://www.emodnet-biology.eu/data-products"><i class="fas fa-link"></i> http://www.emodnet-biology.eu/data-products</a><br>
<img class="plain" src="images/EMODnetBio_prod.png" height="450px">
</section>
<section class="center">
<h1>Latest developments<br>
</section>
<section>
<h2> High-frequency radar interpolation <i class="fas fa-broadcast-tower"></i> </h2>
<img src="images/radials_Trieste.jpg" height="450px"/>
<p>Adding physical constrains to improve the reconstruction</p>
</section>
<section>
<h2> Heatmap based on presence/absence data <i class="fab fa-gripfire"></i></h2>
<img src="images/Amphiura_filiformis_density.png" height="450px"/>
</section>
<section>
<h2> Pluto notebooks instead of Jupyer</h2>
<img src="images/pluto_ex.png" height="300px"/>
<p><b>lightweight:</b> written in pure Julia</p>
<p><b>simple:</b> no hidden workspace state, cool user interface</p>
<p><b>reactive:</b> automatically updated when a cell changes</p>
</section>
<section data-background-iframe="http://localhost:1234/edit?id=ff5c6e4c-f82c-11ea-1b09-d5d1be36a6d7" data-background-interactive>
</section>
</section>
<section>
<section class="center">
<h1>Concluding remarks</h1>
</section>
<section class="center">
<h2>Why may I not be able to use it <i class="fas fa-question-circle"></i></h2>
<h3 style="margin-bottom:1cm"><i class="fas fa-hourglass-end"></i></h3>
<p>
<b>Hofstadter's Law</b>:<br>
<blockquote>
It always takes longer than you expect, <br>
even when you take into account Hofstadter's Law."
</blockquote>
</p>
</section>
<section class="center">
<h2>Does it work only with oceanographic data <i class="fas fa-question-circle"></i></h2>
<img src="images/divaXray.png" height="120px"/>
<img src="images/divaXray2.png" height="350px"/>
</section>
<section class="center">
<h2>Does it work only with oceanographic data <i class="fas fa-question-circle"></i></h2>
<p> Fire <i>heatmap</i>, based on remote sensing data (MODIS and VIIRS)</p>
<img src="images/heat_geotiff4.png" height="350px"/>
</section>
<section class="center">
<h2 style="margin-bottom:3cm">Your state after this presentation <i class="fas fa-question-circle"></i></h2>
<p style="text-align:left"> <i class="fas fa-battery-empty"></i> Bad work, I don't want to use this tool </p>
<p style="text-align:left"> <i class="fas fa-battery-half"></i> Not bad, but I'll never use it </p>
<p style="text-align:left"> <i class="fas fa-battery-full"></i> Cool, I want to try it with a dataset of mine </p>
</section>
<!--
<section >
<h2>Who is Julia?</h2>
<p class="fragment">
Julia Child (1912-20s04)<br>
<img src="images/JuliaChild2.jpg" height="400px"/><br>
<h6 class="fragment">By Lynn Gilbert - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=51678880
</h6>
</p>
</section>
-->
<section>
<h2>Quick recap</h2>
<ol>
<li style="margin-bottom: 35px"> DIVAnd is a software tool specifically designed for<br> the spatial interpolation
of oceanographic data</li>
<li style="margin-bottom: 35px"> The code is written in the <a href="julialang.org/">Julia</a> language and
<br> optimised to process large amounts of data</li>
<li style="margin-bottom: 35px"> The tool is currently used in different <a href="https://www.emodnet.eu/en">EMODnet</a> lots<br>
and deployed in the frame of other Europea initiaves<br>
such as <img style='vertical-align:middle'; src="images/logo_phidias.jpg" height="35px"> <a href="https://www.phidias-hpc.eu/">PHIDIAS</a>,
<img style='vertical-align:middle'; src="images/logo_bluecloud.jpg" height="35px"> <a href="https://www.blue-cloud.org/">BlueCloud</a>, <img style='vertical-align:middle'; src="images/logo_eoschub.jpg" height="35px"> <a href="https://www.eosc-hub.eu/">EOSC-Hub</a></li>
</ol>
</section>
</section>
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