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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Spatial data interpolation</title>
<meta name="description" content="Spatial data interpolation">
<meta name="author" content="Charles">
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</head>
<body>
<div class="reveal">
<div class="slides">
<section>
<section class="center">
<h2>DIVA & DIVAnd interpolation tools</h2>
<h3>All you need to know about them</h3>
<p>
<i class="fab fa-github"></i> gher-ulg<br>
<i class="fab fa-twitter"></i> @GHER_ULiege <br>
<i class="ai ai-orcid"></i> 0000-0002-0265-1021
</p>
<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"/>
<img src="images/logo_emodnet.png" height="100px"/></p>
</section>
<section class="center">
<h1>What (who?) is DIVA?</h1>
<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 is [not] DIVAnd?</h1>
<img src="images/logo_divand.png" height="200px"/>
<p>= n dimensional version of DIVA</p>
<p>≠ not a new release of DIVA,<br>
but a brand new code<p/>
</section>
<section class="center">
<h1>What's the goal of DIVA{nd}?</h1>
<p><img src="images/Diva_gridding_canary.png" height="350px"/></p>
<p>Get gridded field from in situ data</p>
</section>
<section>
<h1>What are the differences<br> between them?</h1>
<p><i class="fas fa-calculator"></i> Mathematical formulation</p>
<p><i class="fas fa-code"></i>Programming language</p>
<p><i class="fas fa-user-circle"></i>User interface</p>
</section>
<section class="center">
<h1>Who wrote the code?</h1>
<img class="plain" src="images/alexander-barth.jpeg" height="150px">
<img class="plain" src="images/michel-rixen.jpeg" height="150px">
<img class="plain" src="images/jeanmarie-beckers.jpeg" height="150px">
<img class="plain" src="images/pierre-brasseur.jpg" height="150px">
<img class="plain" src="images/mohamed.jpeg" height="150px">
<img class="plain" src="images/sylvain.jpg" height="150px"><br>
<p class="fragment">and a few others since 1991</p>
</section>
<section>
<h1>Why <img class="plain" src="images/logo_julia0.png" height="100px" style="vertical-align:middle"/>,<br>
why not <img class="plain" src="images/Rlogo.png" height="100px" style="vertical-align:middle"/> or
<img class="plain" src="images/logo_python.png" height="100px" style="vertical-align:middle"/>?</h1>
</section>
<section>
<img src="images/harder_better.jpg" height="500px"/><br>
<h5>Source: http://daftpunk.wikia.com, No copyright infringement is intended</h5>
</section>
<section>
<h2>Better...</h2>
<br>
<p style="text-align:left">
Multiple dispatch<br>
Math-friendly syntax<br>
Unicode support: π, η, ∫ϵα
</p>
<pre><code>
julia> 🌊 = 1./3.
julia> cos(🌊*π)
0.5000000000000001
</code></pre>
</section>
<section>
<h2>Faster</h2>
<p style="text-align:left">
Just-in-time (JIT) compiled<br>
Parallelism
</p>
<pre><code class="julia">
function fib(n::Int)
f=Vector{Int}(undef, n+1)
f[1]=f[2]=1;
for i=3:n+1
f[i]=f[i-1]+f[i-2]
end
return f
end
ff = @time fib(400000000);
1.158971 seconds (18.52 k allocations: 2.981 GiB, 0.84% gc time)
</code></pre>
</section>
<section>
<h2>Stronger</h2>
<p style="text-align:left">
<b>Metaprogramming:</b><br>
Julia programs can read, analyse, generate other Julia programs<br>
<br>
"Easy" interfacing: R, Python, ...
</p>
<pre><code class="julia">
@pyimport numpy.random as nr
nr.rand(3,4)
</code></pre>
</section>
<section>
<h2>Harder</h2>
<p style="text-align:left">
Learning a new and evolving language<br>
Transition from 0.6 to 1.0<br>
</p>
<img src="images/julia_release.jpg" height="400px"/><br>
</section>
</section>
</section>
<section class="center">
<h1>How can I get the code?</h1>
<img class="plain" src="images/596px-Diva46.png" height="340px"><br>
<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>
<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>
</section>
<section>
<section class="center">
<h1>Who's using it?</h1>
</section>
<section class="center">
<p>SeaDataCloud regional leaders, creating climatologies</p>
<a href="https://www.seadatanet.org/Products/Climatologies">https://www.seadatanet.org/Products/Climatologies</a>
<img class="plain" src="images/fig07b_winter_salinity_100.png" height="300px"><br>
</section>
<section class="center">
<p>EMODnet Chemistry regional leaders</p>
<a href="http://www.emodnet-chemistry.eu/products">http://www.emodnet-chemistry.eu/products</a><br>
<img class="plain" src="images/EMODnet_data_domains02.png" height="450px">
</section>
<section class="center">
<p>EMODnet Biology (specific products)</p>
<a href="http://www.emodnet-biology.eu/data-products">http://www.emodnet-biology.eu/data-products</a><br>
<img class="plain" src="images/EMODnetBio_prod.png" height="450px">
</section>
<section>
<h3> Example: zooplankton count in the Baltic Sea</h3>
<p class="fragment step-fade-in-then-out"><img src="images/KeratellaCruciformis-2007.png" height="450px"/></p>
<p class="fragment step-fade-in-then-out"><img src="images/KeratellaCruciformis-2008.png" height="450px"/></p>
<p class="fragment step-fade-in-then-out"><img src="images/KeratellaCruciformis-2009.png" height="450px"/></p>
<p class="fragment step-fade-in-then-out"><img src="images/KeratellaCruciformis-2010.png" height="450px"/></p>
<p class="fragment step-fade-in-then-out"><img src="images/KeratellaCruciformis-2011.png" height="450px"/></p>
<p class="fragment step-fade-in-then-out"><img src="images/KeratellaCruciformis-2012.png" height="450px"/></p>
</section>
<section class="center">
BioOracle: <a href="http://www.bio-oracle.org/index.php">http://www.bio-oracle.org/index.php</a><br>
<img src="images/biooracle.png" height="150px"/></p>
</section>
</section>
</section>
<section>
<section class="center">
<h1>Can I test it without installing it?</h1>
</section>
<section>
<p>DIVA (2D) within Ocean Data View</p>
<a href="http://odv.awi.de/">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">
<p>DIVA-on-Web (2D)</p>
<a href="http://ec.oceanbrowser.net/emodnet/diva.html">http://ec.oceanbrowser.net/emodnet/diva.html</a><br>
<img class="plain" src="images/divaonweb.png" height="450px">
</section>
<section class="center">
<p>Jupyter notebooks inside the Virtual Research Environment</p>
<img class="plain" src="images/divand_notebooks.jpg" height="450px">
</section>
<section class="center">
<p>DIVAnd REST API (2D)</p>
<img class="plain" src="images/divand_rest.png" height="450px">
</section>
</section>
<section>
<section class="center">
<h1>Why (do we think) it is better than any other method?</h1>
</section>
<section class="center">
Fast, robust, specific to ocean<br>
Separation of sub-domains<br>
Associated error field<br>
<img class="plain" src="images/baltic_leaflet07.png" height="450px">
</section>
</section>
<section>
<section class="center">
<h1>Can I interpolate velocity measurements?</h1>
</section>
<section data-markdown data-transition="fade-in slide-out">
## High-frequency radar interpolation
Synthetic velocity field, red arrow = measurement
</section>
<section data-markdown data-transition="fade-in slide-out">
## High-frequency radar interpolation
Adding the influence of the coast
</section>
<section data-markdown data-transition="fade-in slide-out">
## High-frequency radar interpolation
Low horizontal divergence of currents
</section>
<section data-markdown data-transition="fade-in slide-out">
## High-frequency radar interpolation
Including Coriolis force and geostrophically balanced mean flow<br>
Test areas: Ibiza Channel, Gulf of Trieste
</section>
</section>
<section>
<section class="center">
<h1>Would you help me use it?</h1>
</section>
</section>
<section class="center">
<h2>Why may I not be able to use it?</h2>
<h3><i class="fas fa-hourglass-end"></i></h3>
<p class="fragment">
<b>Hofstadter's Law</b>:<br>
<it>It always takes longer than you expect, <br>
even when you take into account Hofstadter's Law.</it>
</p>
</section>
<section>
<section class="center">
<h1>How to cite?</h1>
<p class="fragment">Barth, A., Beckers, J.-M., Troupin, C., Alvera-Azcárate, A., and Vandenbulcke, L.:
DIVAnd-1.0: n-dimensional variational data analysis for ocean observations,
Geosci. Model Dev., 7, 225-241, doi:10.5194/gmd-7-225-2014, 2014.
</p>
</section>
<section class="center"> <h3>One DOI per code release</h3>
2.3.1 → <img src="https://zenodo.org/badge/DOI/10.5281/zenodo.2562095.svg" style="vertical-align:middle"/> <br>
2.3.0 → <img src="https://zenodo.org/badge/DOI/10.5281/zenodo.2548856.svg" style="vertical-align:middle"/> <br>
...
</section>
</section>
<section >
<h2>Who is Julia?</h2>
<p class="fragment">
Julia Child (1912-2004)<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 class="center">
<h1> Thanks for your attention </h1>
</section>
</section>
</div>
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