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<section id="title-slide" class="quarto-title-block center">
<h1 class="title">Data Strategies for Future Us</h1>
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Andy Barrett, National Snow and Ice Data Center
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<p class="date">2023-05-03</p>
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<section id="what-are-data-strategies" class="slide level2">
<h2>What are Data Strategies?</h2>
<p>Data Strategies enhance collaboration and reproducible science.</p>
<ul>
<li>Workflows;<br>
</li>
<li>Data management best practices;<br>
</li>
<li>Documentation;</li>
</ul>
<p>Good to start from the beginning of a project, great to start from where you are now.</p>
</section>
<section id="who-is-future-us" class="slide level2">
<h2>Who is future us?</h2>
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<div class="column">
<p>You.</p>
<p>Your team.</p>
<p>The scientific community.</p>
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<p><img data-src="images/horst-starwars-teamwork.png"></p>
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<h2>A simple data workflow</h2>
<img data-src="images/wickham-data-science-workflow.png" class="r-stretch quarto-figure-center"><p class="caption">http://r4ds.hadley.nz/</p></section>
<section id="when-to-cloud" class="slide level2">
<h2>When to cloud?</h2>
<ul>
<li>What is the data volume?</li>
<li>How long will it take to download?</li>
<li>Can you store all that data (cost and space)?<br>
</li>
<li>Do you have the computing power for processing?<br>
</li>
<li>Does your team need a common computing environment?<br>
</li>
<li>Do you need to share data at each step or just an end product?</li>
</ul>
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<h2>Workflow Solutions</h2>
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Model->Transform
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</div>
</div>
</div>
</section>
<section id="workflow-solutions-1" class="slide level2">
<h2>Workflow Solutions</h2>
<h3 id="hybrid">Hybrid</h3>
<div class="cell">
<div class="cell-output-display">
<div>
<p>
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G
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cluster_incloud
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<title>
communicate
</title>
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<title>
cloud
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<title>
tidy_cloud
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<title>
cloud->tidy_cloud
</title>
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<title>
daac
</title>
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<title>
tidy_local
</title>
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<title>
daac->tidy_local
</title>
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<title>
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<title>
tidy_cloud->Transform
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<title>
tidy_local->Transform
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<title>
Visualize
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<title>
Transform->Visualize
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<title>
Model
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<title>
Visualize->Model
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<title>
Model->communicate
</title>
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<title>
Model->Transform
</title>
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</svg>
</p>
</div>
</div>
</div>
</section>
<section id="workflow-solutions-2" class="slide level2">
<h2>Workflow Solutions</h2>
<h3 id="all-in-cloud">All in cloud</h3>
<div class="cell">
<div class="cell-output-display">
<div>
<p>
<svg width="960" height="480" viewbox="0.00 0.00 314.83 444.80" xmlns="http://www.w3.org/2000/svg" xlink="http://www.w3.org/1999/xlink" style=" display: block; margin: auto auto auto auto">
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G
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<polygon fill="white" stroke="transparent" points="-4,4 -4,-440.8 310.83,-440.8 310.83,4 -4,4"></polygon> <g id="clust1" class="cluster">
<title>
cluster_incloud
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<title>
communicate
</title>
<text text-anchor="middle" x="159" y="-13.8" font-family="Helvetica,Arial,sans-serif" font-size="14.00">Communicate</text> </g> <!-- cloud --> <g id="node2" class="node">
<title>
cloud
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<title>
tidy_cloud
</title>
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<title>
cloud->tidy_cloud
</title>
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<title>
daac
</title>
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<title>
daac->tidy_cloud
</title>
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Transform
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<title>
tidy_cloud->Transform
</title>
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Visualize
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<title>
Transform->Visualize
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Model
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<title>
Visualize->Model
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Model->communicate
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Model->Transform
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</div>
</div>
</div>
</section>
<section id="workflow-solutions-3" class="slide level2">
<h2>Workflow Solutions</h2>
<h3 id="use-cloud-based-services">Use Cloud-based Services</h3>
<ul>
<li><p>Cloud services are infrastructure, platforms and software hosted in the cloud and made available to users via an API, often accessed via a web interface.</p></li>
<li><p>NASA’s Harmony (https://harmony.earthdata.nasa.gov/) can subset, reproject and reformat, and serve data.</p></li>
<li><p>This might save processing steps.</p></li>
</ul>
</section>
<section id="what-does-this-look-like-in-the-cloud" class="slide level2">
<h2>What does this look like in the cloud?</h2>
<div class="sourceCode" id="cb1"><pre class="sourceCode numberSource python number-lines code-with-copy"><code class="sourceCode python"><span id="cb1-1"><a href="#cb1-1"></a><span class="im">import</span> earthaccess</span>
<span id="cb1-2"><a href="#cb1-2"></a></span>
<span id="cb1-3"><a href="#cb1-3"></a>auth <span class="op">=</span> earthaccess.login(strategy<span class="op">=</span><span class="st">'netrc'</span>)</span>
<span id="cb1-4"><a href="#cb1-4"></a></span>
<span id="cb1-5"><a href="#cb1-5"></a>Query <span class="op">=</span> earthaccess.granule_query().concept_id(</span>
<span id="cb1-6"><a href="#cb1-6"></a> <span class="st">'C2153572614-NSIDC_CPRD'</span></span>
<span id="cb1-7"><a href="#cb1-7"></a>).temporal(</span>
<span id="cb1-8"><a href="#cb1-8"></a> <span class="st">"2020-03-01"</span>, <span class="st">"2020-03-30"</span></span>
<span id="cb1-9"><a href="#cb1-9"></a>).bounding_box(</span>
<span id="cb1-10"><a href="#cb1-10"></a> <span class="op">-</span><span class="fl">134.7</span>,<span class="fl">58.9</span>,<span class="op">-</span><span class="fl">133.9</span>,<span class="fl">59.2</span>)</span>
<span id="cb1-11"><a href="#cb1-11"></a></span>
<span id="cb1-12"><a href="#cb1-12"></a>granules <span class="op">=</span> Query.get(<span class="dv">4</span>)</span>
<span id="cb1-13"><a href="#cb1-13"></a></span>
<span id="cb1-14"><a href="#cb1-14"></a>files <span class="op">=</span> earthaccess.<span class="bu">open</span>(granules)</span>
<span id="cb1-15"><a href="#cb1-15"></a>ds <span class="op">=</span> xr.open_dataset(files[<span class="dv">1</span>], group<span class="op">=</span><span class="st">'/gt1l/land_ice_segments'</span>)</span>
<span id="cb1-16"><a href="#cb1-16"></a>ds</span>
<span id="cb1-17"><a href="#cb1-17"></a></span>
<span id="cb1-18"><a href="#cb1-18"></a><span class="co"># Start to do awesome science</span></span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</section>
<section id="how-to-future-proof-workflows-and-make-them-reproducible" class="slide level2">
<h2>How to future-proof workflows and make them reproducible</h2>
<p><strong>FAIR</strong></p>
<ul>
<li><strong>F</strong>indable,</li>
<li><strong>A</strong>ccessible,</li>
<li><strong>I</strong>nteroperable,</li>
<li><strong>R</strong>eusable</li>
</ul>
<p>Applies to the future you and your team as well.</p>
</section>
<section id="make-sure-data-are-findable-and-accessible" class="slide level2">
<h2>Make sure data are <strong>F</strong>indable and <strong>A</strong>ccessible</h2>
<p>Does everyone on your team know where the data is?</p>
<p>Can they access it?</p>
<p>Helpful to document this somewhere.</p>
</section>
<section id="data-management" class="slide level2">
<h2>Data Management</h2>
<p>Keep raw data, raw!</p>
<p>Save intermediate data not just final versions.</p>
<p>Use consistent and descriptive folder and file name patterns.</p>
<pre><code>(base) nsidc-442-abarrett:data_strategies_for_a_future_us$ tree Data
Data
├── calibrated
├── cleaned
├── figures
├── final
├── monthly_averages
├── raw
└── results
7 directories, 0 files</code></pre>
</section>
<section id="standard-file-formats-make-data-interoperable" class="slide level2">
<h2>Standard file formats make data <strong>I</strong>nteroperable</h2>
<ul>
<li>GeoTIFF for imagery or 2D raster data<br>
</li>
<li>NetCDF for multi-dimensional data (3D+)<br>
</li>
<li>Shapefiles or GeoJSON for vector data<br>
</li>
<li>csv for tabular data.</li>
</ul>
<p>Avoid Excel and other proprietary formats.</p>
</section>
<section id="metadata-makes-data-interoperable-and-reusable." class="slide level2">
<h2>Metadata makes data <strong>I</strong>nteroperable and <strong>R</strong>eusable.</h2>
<p>Metadata standards and conventions ensure that standard tools can read/interpret the data.</p>
<p>Standards also define the meaning of metadata attributes.</p>
<ul>
<li>What is the Coordinate Reference System?<br>
(projection, grid mapping)</li>
<li>What are the units?<br>
</li>
<li>What is the variable name?<br>
</li>
<li>What is the source of the data?<br>
</li>
<li>What script produced the data?</li>
</ul>
</section>
<section id="document-the-analysis" class="slide level2">
<h2>Document the Analysis</h2>
<p>Document each step.</p>
<ul>
<li>Where did you get the data, which files, which version?</li>
<li>Write it down. Anywhere is good but using a script is better.</li>
</ul>
<p>Can you (or anyone else) easily reproduce your processing pipeline?</p>
<p>With GUI interfaces - e.g. ArcGIS, QGIS, Excel - use screenshots, journal commands.</p>
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// bouncing the down arrow when they first encounter a vertical slide
controlsTutorial: false,
// Determines where controls appear, "edges" or "bottom-right"
controlsLayout: 'edges',
// Visibility rule for backwards navigation arrows; "faded", "hidden"
// or "visible"
controlsBackArrows: 'faded',
// Display a presentation progress bar
progress: true,
// Display the page number of the current slide
slideNumber: 'c/t',
// 'all', 'print', or 'speaker'
showSlideNumber: 'all',
// Add the current slide number to the URL hash so that reloading the
// page/copying the URL will return you to the same slide
hash: true,
// Start with 1 for the hash rather than 0
hashOneBasedIndex: false,
// Flags if we should monitor the hash and change slides accordingly
respondToHashChanges: true,
// Push each slide change to the browser history
history: true,
// Enable keyboard shortcuts for navigation
keyboard: true,
// Enable the slide overview mode
overview: true,
// Disables the default reveal.js slide layout (scaling and centering)
// so that you can use custom CSS layout
disableLayout: false,
// Vertical centering of slides
center: false,
// Enables touch navigation on devices with touch input
touch: true,
// Loop the presentation
loop: false,
// Change the presentation direction to be RTL
rtl: false,
// see https://revealjs.com/vertical-slides/#navigation-mode
navigationMode: 'linear',
// Randomizes the order of slides each time the presentation loads
shuffle: false,
// Turns fragments on and off globally
fragments: true,
// Flags whether to include the current fragment in the URL,
// so that reloading brings you to the same fragment position
fragmentInURL: false,
// Flags if the presentation is running in an embedded mode,
// i.e. contained within a limited portion of the screen
embedded: false,
// Flags if we should show a help overlay when the questionmark
// key is pressed
help: true,
// Flags if it should be possible to pause the presentation (blackout)
pause: true,
// Flags if speaker notes should be visible to all viewers
showNotes: false,
// Global override for autoplaying embedded media (null/true/false)
autoPlayMedia: null,
// Global override for preloading lazy-loaded iframes (null/true/false)
preloadIframes: null,
// Number of milliseconds between automatically proceeding to the
// next slide, disabled when set to 0, this value can be overwritten
// by using a data-autoslide attribute on your slides
autoSlide: 0,
// Stop auto-sliding after user input
autoSlideStoppable: true,
// Use this method for navigation when auto-sliding
autoSlideMethod: null,
// Specify the average time in seconds that you think you will spend
// presenting each slide. This is used to show a pacing timer in the
// speaker view
defaultTiming: null,
// Enable slide navigation via mouse wheel
mouseWheel: false,
// The display mode that will be used to show slides
display: 'block',
// Hide cursor if inactive
hideInactiveCursor: true,
// Time before the cursor is hidden (in ms)
hideCursorTime: 5000,
// Opens links in an iframe preview overlay
previewLinks: false,
// Transition style (none/fade/slide/convex/concave/zoom)
transition: 'none',
// Transition speed (default/fast/slow)
transitionSpeed: 'default',
// Transition style for full page slide backgrounds
// (none/fade/slide/convex/concave/zoom)
backgroundTransition: 'none',
// Number of slides away from the current that are visible
viewDistance: 3,
// Number of slides away from the current that are visible on mobile
// devices. It is advisable to set this to a lower number than
// viewDistance in order to save resources.
mobileViewDistance: 2,
// The "normal" size of the presentation, aspect ratio will be preserved
// when the presentation is scaled to fit different resolutions. Can be
// specified using percentage units.
width: 1050,
height: 700,
// Factor of the display size that should remain empty around the content
margin: 0.1,
math: {
mathjax: 'https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js',
config: 'TeX-AMS_HTML-full',
tex2jax: {
inlineMath: [['\\(','\\)']],
displayMath: [['\\[','\\]']],
balanceBraces: true,
processEscapes: false,
processRefs: true,
processEnvironments: true,
preview: 'TeX',
skipTags: ['script','noscript','style','textarea','pre','code'],