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slides.html
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<!DOCTYPE html>
<html lang="en"><head>
<script src="slides_files/libs/clipboard/clipboard.min.js"></script>
<script src="slides_files/libs/quarto-html/tabby.min.js"></script>
<script src="slides_files/libs/quarto-html/popper.min.js"></script>
<script src="slides_files/libs/quarto-html/tippy.umd.min.js"></script>
<link href="slides_files/libs/quarto-html/tippy.css" rel="stylesheet">
<link href="slides_files/libs/quarto-html/quarto-html.min.css" rel="stylesheet">
<link href="slides_files/libs/quarto-html/quarto-syntax-highlighting.css" rel="stylesheet" id="quarto-text-highlighting-styles"><meta charset="utf-8">
<meta name="generator" content="quarto-0.9.592">
<title>quarto-input32da7e8c</title>
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">
<link rel="stylesheet" href="slides_files/libs/revealjs/dist/reset.css">
<link rel="stylesheet" href="slides_files/libs/revealjs/dist/reveal.css">
<style>
code{white-space: pre-wrap;}
span.smallcaps{font-variant: small-caps;}
span.underline{text-decoration: underline;}
div.column{display: inline-block; vertical-align: top; width: 50%;}
div.hanging-indent{margin-left: 1.5em; text-indent: -1.5em;}
ul.task-list{list-style: none;}
pre > code.sourceCode { white-space: pre; position: relative; }
pre > code.sourceCode > span { display: inline-block; line-height: 1.25; }
pre > code.sourceCode > span:empty { height: 1.2em; }
.sourceCode { overflow: visible; }
code.sourceCode > span { color: inherit; text-decoration: inherit; }
div.sourceCode { margin: 1em 0; }
pre.sourceCode { margin: 0; }
@media screen {
div.sourceCode { overflow: auto; }
}
@media print {
pre > code.sourceCode { white-space: pre-wrap; }
pre > code.sourceCode > span { text-indent: -5em; padding-left: 5em; }
}
pre.numberSource code
{ counter-reset: source-line 0; }
pre.numberSource code > span
{ position: relative; left: -4em; counter-increment: source-line; }
pre.numberSource code > span > a:first-child::before
{ content: counter(source-line);
position: relative; left: -1em; text-align: right; vertical-align: baseline;
border: none; display: inline-block;
-webkit-touch-callout: none; -webkit-user-select: none;
-khtml-user-select: none; -moz-user-select: none;
-ms-user-select: none; user-select: none;
padding: 0 4px; width: 4em;
color: #aaaaaa;
}
pre.numberSource { margin-left: 3em; border-left: 1px solid #aaaaaa; padding-left: 4px; }
div.sourceCode
{ color: #003b4f; background-color: #f1f3f5; }
@media screen {
pre > code.sourceCode > span > a:first-child::before { text-decoration: underline; }
}
code span { color: #003b4f; } /* Normal */
code span.al { color: #ad0000; } /* Alert */
code span.an { color: #5e5e5e; } /* Annotation */
code span.at { color: #657422; } /* Attribute */
code span.bn { color: #ad0000; } /* BaseN */
code span.bu { } /* BuiltIn */
code span.cf { color: #003b4f; } /* ControlFlow */
code span.ch { color: #20794d; } /* Char */
code span.cn { color: #8f5902; } /* Constant */
code span.co { color: #5e5e5e; } /* Comment */
code span.cv { color: #5e5e5e; font-style: italic; } /* CommentVar */
code span.do { color: #5e5e5e; font-style: italic; } /* Documentation */
code span.dt { color: #ad0000; } /* DataType */
code span.dv { color: #ad0000; } /* DecVal */
code span.er { color: #ad0000; } /* Error */
code span.ex { } /* Extension */
code span.fl { color: #ad0000; } /* Float */
code span.fu { color: #4758ab; } /* Function */
code span.im { color: #00769e; } /* Import */
code span.in { color: #5e5e5e; } /* Information */
code span.kw { color: #003b4f; } /* Keyword */
code span.op { color: #5e5e5e; } /* Operator */
code span.ot { color: #003b4f; } /* Other */
code span.pp { color: #ad0000; } /* Preprocessor */
code span.sc { color: #5e5e5e; } /* SpecialChar */
code span.ss { color: #20794d; } /* SpecialString */
code span.st { color: #20794d; } /* String */
code span.va { color: #111111; } /* Variable */
code span.vs { color: #20794d; } /* VerbatimString */
code span.wa { color: #5e5e5e; font-style: italic; } /* Warning */
</style>
<link rel="stylesheet" href="slides_files/libs/revealjs/dist/theme/quarto.css" id="theme">
<link href="slides_files/libs/revealjs/plugin/quarto-line-highlight/line-highlight.css" rel="stylesheet">
<link href="slides_files/libs/revealjs/plugin/reveal-menu/menu.css" rel="stylesheet">
<link href="slides_files/libs/revealjs/plugin/reveal-menu/quarto-menu.css" rel="stylesheet">
<link href="slides_files/libs/revealjs/plugin/reveal-chalkboard/font-awesome/css/all.css" rel="stylesheet">
<link href="slides_files/libs/revealjs/plugin/reveal-chalkboard/style.css" rel="stylesheet">
<link href="slides_files/libs/revealjs/plugin/quarto-support/footer.css" rel="stylesheet">
<style type="text/css">
.callout {
margin-top: 1em;
margin-bottom: 1em;
border-radius: .25rem;
}
.callout.callout-style-simple {
padding: 0em 0.5em;
border-left: solid #acacac .3rem;
border-right: solid 1px silver;
border-top: solid 1px silver;
border-bottom: solid 1px silver;
display: flex;
}
.callout.callout-style-default {
border-left: solid #acacac .3rem;
border-right: solid 1px silver;
border-top: solid 1px silver;
border-bottom: solid 1px silver;
}
.callout .callout-body-container {
flex-grow: 1;
}
.callout.callout-style-simple .callout-body {
font-size: 1rem;
font-weight: 400;
}
.callout.callout-style-default .callout-body {
font-size: 0.9rem;
font-weight: 400;
}
.callout.callout-captioned.callout-style-simple .callout-body {
margin-top: 0.2em;
}
.callout:not(.callout-captioned) .callout-body {
display: flex;
}
.callout:not(.no-icon).callout-captioned.callout-style-simple .callout-content {
padding-left: 1.6em;
}
.callout.callout-captioned .callout-header {
padding-top: 0.2em;
margin-bottom: -0.2em;
}
.callout.callout-captioned .callout-caption p {
margin-top: 0.5em;
margin-bottom: 0.5em;
}
.callout.callout-captioned.callout-style-simple .callout-content p {
margin-top: 0;
}
.callout.callout-captioned.callout-style-default .callout-content p {
margin-top: 0.7em;
}
.callout.callout-style-simple div.callout-caption {
border-bottom: none;
font-size: .9rem;
font-weight: 600;
opacity: 75%;
}
.callout.callout-style-default div.callout-caption {
border-bottom: none;
font-weight: 600;
opacity: 85%;
font-size: 0.9rem;
padding-left: 0.5em;
padding-right: 0.5em;
}
.callout.callout-style-default div.callout-content {
padding-left: 0.5em;
padding-right: 0.5em;
}
.callout.callout-style-simple .callout-icon::before {
height: 1rem;
width: 1rem;
display: inline-block;
content: "";
background-repeat: no-repeat;
background-size: 1rem 1rem;
}
.callout.callout-style-default .callout-icon::before {
height: 0.9rem;
width: 0.9rem;
display: inline-block;
content: "";
background-repeat: no-repeat;
background-size: 0.9rem 0.9rem;
}
.callout-caption {
display: flex
}
.callout-icon::before {
margin-top: 1rem;
padding-right: .5rem;
}
.callout.no-icon::before {
display: none !important;
}
.callout.callout-captioned .callout-body > .callout-content > :last-child {
margin-bottom: 0.5rem;
}
.callout.callout-captioned .callout-icon::before {
margin-top: .5rem;
padding-right: .5rem;
}
.callout:not(.callout-captioned) .callout-icon::before {
margin-top: 1rem;
padding-right: .5rem;
}
/* Callout Types */
div.callout-note {
border-left-color: #4582ec !important;
}
div.callout-note .callout-icon::before {
background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAAAXNSR0IArs4c6QAAAERlWElmTU0AKgAAAAgAAYdpAAQAAAABAAAAGgAAAAAAA6ABAAMAAAABAAEAAKACAAQAAAABAAAAIKADAAQAAAABAAAAIAAAAACshmLzAAAEU0lEQVRYCcVXTWhcVRQ+586kSUMMxkyaElstCto2SIhitS5Ek8xUKV2poatCcVHtUlFQk8mbaaziwpWgglJwVaquitBOfhQXFlqlzSJpFSpIYyXNjBNiTCck7x2/8/LeNDOZxDuEkgOXe++553zfefee+/OYLOXFk3+1LLrRdiO81yNqZ6K9cG0P3MeFaMIQjXssE8Z1JzLO9ls20MBZX7oG8w9GxB0goaPrW5aNMp1yOZIa7Wv6o2ykpLtmAPs/vrG14Z+6d4jpbSKuhdcSyq9wGMPXjonwmESXrriLzFGOdDBLB8Y6MNYBu0dRokSygMA/mrun8MGFN3behm6VVAwg4WR3i6FvYK1T7MHo9BK7ydH+1uurECoouk5MPRyVSBrBHMYwVobG2aOXM07sWrn5qgB60rc6mcwIDJtQrnrEr44kmy+UO9r0u9O5/YbkS9juQckLed3DyW2XV/qWBBB3ptvI8EUY3I9p/67OW+g967TNr3Sotn3IuVlfMLVnsBwH4fsnebJvyGm5GeIUA3jljERmrv49SizPYuq+z7c2H/jlGC+Ghhupn/hcapqmcudB9jwJ/3jvnvu6vu5lVzF1fXyZuZZ7U8nRmVzytvT+H3kilYvH09mLWrQdwFSsFEsxFVs5fK7A0g8gMZjbif4ACpKbjv7gNGaD8bUrlk8x+KRflttr22JEMRUbTUwwDQScyzPgedQHZT0xnx7ujw2jfVfExwYHwOsDTjLdJ2ebmeQIlJ7neo41s/DrsL3kl+W2lWvAga0tR3zueGr6GL78M3ifH0rGXrBC2aAR8uYcIA5gwV8zIE8onoh8u0Fca/ciF7j1uOzEnqcIm59sEXoGc0+z6+H45V1CvAvHcD7THztu669cnp+L0okAeIc6zjbM/24LgGM1gZk7jnRu1aQWoU9sfUOuhrmtaPIO3YY1KLLWZaEO5TKUbMY5zx8W9UJ6elpLwKXbsaZ4EFl7B4bMtDv0iRipKoDQT2sNQI9b1utXFdYisi+wzZ/ri/1m7QfDgEuvgUUEIJPq3DhX/5DWNqIXDOweC2wvIR90Oq3lDpdMIgD2r0dXvGdsEW5H6x6HLRJYU7C69VefO1x8Gde1ZFSJLfWS1jbCnhtOPxmpfv2LXOA2Xk2tvnwKKPFuZ/oRmwBwqRQDcKNeVQkYcOjtWVBuM/JuYw5b6isojIkYxyYAFn5K7ZBF10fea52y8QltAg6jnMqNHFBmGkQ1j+U43HMi2xMar1Nv0zGsf1s8nUsmUtPOOrbFIR8bHFDMB5zL13Gmr/kGlCkUzedTzzmzsaJXhYawnA3UmARpiYj5ooJZiUoxFRtK3X6pgNPv+IZVPcnwbOl6f+aBaO1CNvPW9n9LmCp01nuSaTRF2YxHqZ8DYQT6WsXT+RD6eUztwYLZ8rM+rcPxamv1VQzFUkzFXvkiVrySGQgJNvXHJAxiU3/NwiC03rSf05VBaPtu/Z7/B8Yn/w7eguloAAAAAElFTkSuQmCC');
}
div.callout-note.callout-style-default .callout-caption {
background-color: #dae6fb
}
div.callout-important {
border-left-color: #d9534f !important;
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<body>
<div class="reveal">
<div class="slides">
<section id="title-slide" class="center">
<h1 class="title"></h1><h2 style="font-size: 75px">
Data Analysis Workshop
</h2>
<div style="margin-bottom: 50px; font-size: 40px">
<p>Linking health survey data with climate datasets in R</p>
</div>
<p class="author"></p><p style="font-size: 25px; margin-left: 50px">
<img src="images/matt.png" width="100" style="vertical-align: middle"> Matt Gunther - Senior Data Analyst
</p><p></p>
<p class="author"></p><p style="font-size: 25px; margin-left: 50px">
<img src="images/devon.png" width="100" style="vertical-align: middle"> Devon Kristiansen - Project Manager
</p><p></p>
</section>
<section id="data-and-research-question" class="slide level2 center">
<h2>Data and Research Question</h2>
<div class="columns">
<div class="column" style="width:50%;">
<div class="fragment fade-in-then-semi-out">
<p>IPUMS PMA: Fertility outcomes for women in Burkina Faso</p>
</div>
<div class="fragment fade-in-then-semi-out">
<p>Toy GPS data: coordinates for each PMA sample cluster</p>
</div>
<div class="fragment fade-in-then-semi-out">
<p>CHIRPS: Rainfall accumulation relative to local averages</p>
</div>
<div class="fragment fade-in">
<p style="color: #98579B">
Do rainfall conditions influence women’s short-term family planning decisions?
</p>
</div>
</div><div class="column" style="width:50%;">
<p><img data-src="images/goals.png" class="absolute" style="height: 400px; "></p>
</div>
</div>
</section>
<section id="setup" class="slide level2 nonincremental">
<h2>Setup</h2>
<div class="cell">
</div>
<p>Follow <a href="https://github.com/matt-gunther/ined-pma-2022">these steps</a> to obtain today’s code & publicly available data.</p>
<p>Open <code>analysis.rmd</code> and begin following along with these code chunks</p>
<div class="columns">
<div class="column" style="width:48%;">
<div class="cell">
<div class="sourceCode cell-code" id="cb1"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb1-1"><a href="#cb1-1"></a><span class="co"># IPUMS & Spatial Data Tools</span></span>
<span id="cb1-2"><a href="#cb1-2"></a><span class="fu">library</span>(tidyverse)</span>
<span id="cb1-3"><a href="#cb1-3"></a><span class="fu">library</span>(ipumsr) </span>
<span id="cb1-4"><a href="#cb1-4"></a><span class="fu">library</span>(sf)</span>
<span id="cb1-5"><a href="#cb1-5"></a><span class="fu">library</span>(terra)</span>
<span id="cb1-6"><a href="#cb1-6"></a><span class="fu">library</span>(ggspatial)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</div><div class="column" style="width:4%;">
</div><div class="column" style="width:48%;">
<div class="cell">
<div class="sourceCode cell-code" id="cb2"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb2-1"><a href="#cb2-1"></a><span class="co"># Analysis Tools </span></span>
<span id="cb2-2"><a href="#cb2-2"></a><span class="fu">library</span>(srvyr)</span>
<span id="cb2-3"><a href="#cb2-3"></a><span class="fu">library</span>(survey)</span>
<span id="cb2-4"><a href="#cb2-4"></a><span class="fu">library</span>(lme4)</span>
<span id="cb2-5"><a href="#cb2-5"></a><span class="fu">library</span>(broom)</span>
<span id="cb2-6"><a href="#cb2-6"></a><span class="fu">library</span>(broom.mixed)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</div>
</div>
<p><img data-src="images/hex/tidyverse.png" class="absolute" style="left: 0px; height: 200px; "> <img data-src="images/hex/ipumsr.png" class="absolute" style="left: 300px; height: 200px; "> <img data-src="images/hex/sf.png" class="absolute" style="left: 600px; height: 200px; "> <img data-src="images/hex/terra.png" class="absolute" style="left: 900px; height: 200px; "></p>
</section>
<section>
<section id="ipums-pma-data" class="title-slide slide level1 center">
<h1>1 - IPUMS PMA Data</h1>
</section>
<section id="downloading-ipums-pma-data" class="slide level2 center nonincremental">
<h2>Downloading IPUMS PMA data</h2>
<div class="columns">
<div class="column" style="width:50%;">
<p><img data-src="images/pma/home.png"></p>
</div><div class="column" style="width:50%;">
<p><a href="https://pma.ipums.org/pma/">Visit the IPUMS PMA data website</a></p>
<ul>
<li class="fragment">Sample
<ul>
<li class="fragment">Burkina Faso</li>
<li class="fragment">Longitudinal</li>
<li class="fragment">Female Respondents Only</li>
</ul></li>
<li class="fragment">Variables
<ul>
<li class="fragment"><a href="https://pma.ipums.org/pma-action/variables/RESULTFQ">RESULTFQ</a></li>
<li class="fragment"><a href="https://pma.ipums.org/pma-action/variables/PANELBIRTH">PANELBIRTH</a></li>
<li class="fragment"><a href="https://pma.ipums.org/pma-action/variables/PANELWEIGHT">PANELWEIGHT</a></li>
<li class="fragment"><a href="https://pma.ipums.org/pma-action/variables/EAID">EAID</a></li>
<li class="fragment"><a href="https://pma.ipums.org/pma-action/variables/URBAN">URBAN</a></li>
</ul></li>
</ul>
</div>
</div>
</section>
<section id="load-ipums-pma-data-into-r" class="slide level2">
<h2>Load IPUMS PMA data into R</h2>
<p>You’ll receive two files from IPUMS - put both in the <code>data</code> folder where <code>analysis.Rmd</code> is located.</p>
<div class="fragment">
<div class="cell">
<div class="sourceCode cell-code" id="cb3"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb3-1"><a href="#cb3-1"></a>pma <span class="ot"><-</span> <span class="fu">read_ipums_micro</span>(</span>
<span id="cb3-2"><a href="#cb3-2"></a> <span class="at">ddi =</span> <span class="st">"data/pma_00136.xml"</span>, <span class="co"># Use your own file name here </span></span>
<span id="cb3-3"><a href="#cb3-3"></a> <span class="at">data =</span> <span class="st">"data/pma_00136.dat.gz"</span> <span class="co"># Use your own file name here </span></span>
<span id="cb3-4"><a href="#cb3-4"></a>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<div class="cell">
</div>
</div>
<div class="fragment">
<div class="cell">
<div class="cell-output cell-output-stdout">
<pre><code># A tibble: 8,257 × 180
SAMPLE_1 SAMPLE_2 SAMPLE_3 SAMPLE_4 COUNTRY YEAR_1 YEAR_2 YEAR_3 YEAR_4
<int+lbl> <int+lbl> <int+lb> <int+lb> <int+l> <int> <int> <int> <int>
1 85409 [Bur… 85412 [Bur… NA NA 1 [Bur… 2019 2021 NA NA
2 85409 [Bur… 85412 [Bur… NA NA 1 [Bur… 2019 2021 NA NA
3 85409 [Bur… 85412 [Bur… NA NA 1 [Bur… 2019 2021 NA NA
4 85409 [Bur… 85412 [Bur… NA NA 1 [Bur… 2019 2021 NA NA
5 85409 [Bur… 85412 [Bur… NA NA 1 [Bur… 2019 2021 NA NA
6 85409 [Bur… 85412 [Bur… NA NA 1 [Bur… 2019 2021 NA NA
7 85409 [Bur… 85412 [Bur… NA NA 1 [Bur… 2019 2021 NA NA
8 85409 [Bur… 85412 [Bur… NA NA 1 [Bur… 2019 2021 NA NA
9 85409 [Bur… 85412 [Bur… NA NA 1 [Bur… 2019 2021 NA NA
10 85409 [Bur… 85412 [Bur… NA NA 1 [Bur… 2019 2021 NA NA
# … with 8,247 more rows, and 171 more variables: ELIGIBLE_1 <int+lbl>,
# ELIGIBLE_2 <int+lbl>, EAID_1 <dbl>, EAID_2 <dbl>, EAID_3 <dbl>,
# EAID_4 <dbl>, CONSENTFQ_1 <int+lbl>, CONSENTFQ_2 <int+lbl>,
# RESULTFQ_1 <int+lbl>, RESULTFQ_2 <int+lbl>, CROSS_SECTION_1 <int+lbl>,
# CROSS_SECTION_2 <int+lbl>, INTFQMON_1 <int+lbl>, INTFQMON_2 <int+lbl>,
# INTFQYEAR_1 <int+lbl>, INTFQYEAR_2 <int+lbl>, FQINSTID <chr>,
# CONSENTHQ_1 <int+lbl>, CONSENTHQ_2 <int+lbl>, FQWEIGHT_1 <dbl>, …</code></pre>
</div>
</div>
</div>
</section>
<section id="data-format" class="slide level2">
<h2>Data format</h2>
<p>We’ve selected <code>wide</code> format longitudinal data, so Phase 1 and Phase 2 data are stored in separate columns.</p>
<div class="fragment">
<div class="cell">
<div class="sourceCode cell-code" id="cb5"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb5-1"><a href="#cb5-1"></a>pma <span class="sc">%>%</span> <span class="fu">count</span>(RESULTFQ_1, RESULTFQ_2)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</div>
<div class="fragment">
<div class="cell">
<div class="cell-output cell-output-stdout">
<pre><code># A tibble: 15 × 3
RESULTFQ_1 RESULTFQ_2 n
<int+lbl> <int+lbl> <int>
1 1 [Completed] 1 [Completed] 5487
2 1 [Completed] 2 [Not at home] 78
3 1 [Completed] 3 [Postponed] 22
4 1 [Completed] 4 [Refused] 66
5 1 [Completed] 5 [Partly completed] 12
6 1 [Completed] 7 [Respondent moved] 15
7 1 [Completed] 10 [Incapacitated] 19
8 1 [Completed] 95 [Not interviewed (female questionnaire)] 4
9 1 [Completed] 96 [Not interviewed (household questionnaire)] 192
10 1 [Completed] 99 [NIU (not in universe)] 399
11 1 [Completed] NA 471
12 5 [Partly completed] 1 [Completed] 4
13 5 [Partly completed] NA 21
14 NA 1 [Completed] 1460
15 NA 5 [Partly completed] 7</code></pre>
</div>
</div>
</div>
<div class="fragment">
<p>Keep only women who completed the survey in <em>both</em> phases of the panel study.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb7"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb7-1"><a href="#cb7-1"></a><span class="co"># Keep only panel members from both phases </span></span>
<span id="cb7-2"><a href="#cb7-2"></a>pma <span class="ot"><-</span> pma <span class="sc">%>%</span> <span class="fu">filter</span>(RESULTFQ_1 <span class="sc">==</span> <span class="dv">1</span> <span class="sc">&</span> RESULTFQ_2 <span class="sc">==</span> <span class="dv">1</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</div>
</section></section>
<section id="questions-about-ipums-pma-data" class="title-slide slide level1 center">
<h1>Questions about IPUMS PMA data?</h1>
</section>
<section>
<section id="pma-gps-data" class="title-slide slide level1 center">
<h1>2- PMA GPS data</h1>
</section>
<section id="about-pma-gps-data" class="slide level2" data-auto-animate="true">
<h2 data-id="quarto-animate-title">About PMA GPS data</h2>
<div class="columns">
<div class="column" style="width:60%;">
<div class="fragment fade-in-then-semi-out">
<p>PMA uses spatially referenced sample clusters - called “enumeration areas” (EAs) - sampled by probability proportional to population size.</p>
</div>
<div class="fragment fade-in-then-semi-out">
<p>At the beginning of the panel study, 35 households were randomly selected within each EA.</p>
</div>
</div><div class="column" style="width:40%;">
</div>
</div>
</section>
<section id="about-pma-gps-data-1" class="slide level2" data-auto-animate="true" data-visibility="uncounted">
<h2 data-id="quarto-animate-title">About PMA GPS data</h2>
<div class="columns">
<div class="column" style="width:60%;">
<div style="opacity:0.5">
<p>PMA uses spatially referenced sample clusters - called “enumeration areas” (EAs) - sampled by probability proportional to population size.</p>
<p>At the beginning of the panel study, 35 households were randomly selected within each EA.</p>
</div>
<div class="fragment fade-in-then-semi-out">
<p>IPUMS PMA does not disseminate the GPS coordinates for EAs, but you may <a href="https://www.pmadata.org/data/request-access-datasets">apply here</a> for access directly from PMA.</p>
</div>
<div class="fragment fade-in-then-semi-out">
<p>Today, we’ll be using <strong>falsified</strong> GPS coordinates as an example.</p>
</div>
</div><div class="column" style="width:40%;">
<p><img data-src="images/pma/gps1.png" class="absolute" style="top: 100px; right: 50px; height: 300px; "></p>
</div>
</div>
</section>
<section id="about-pma-gps-data-2" class="slide level2" data-auto-animate="true" data-visibility="uncounted">
<h2 data-id="quarto-animate-title">About PMA GPS data</h2>
<div class="columns">
<div class="column" style="width:60%;">
<div style="opacity:0.5">
<p>PMA uses spatially referenced sample clusters - called “enumeration areas” (EAs) - sampled by probability proportional to population size.</p>
<p>At the beginning of the panel study, 35 households were randomly selected within each EA.</p>
<p>IPUMS PMA does not disseminate the GPS coordinates for EAs, but you may <a href="https://www.pmadata.org/data/request-access-datasets">apply here</a> for access directly from PMA.</p>
</div>
<p>Today, we’ll be using <strong>falsified</strong> GPS coordinates as an example.</p>
</div><div class="column" style="width:40%;">
<p><img data-src="images/pma/gps1.png" class="absolute" style="top: 300px; right: 0px; height: 300px; "></p>
</div>
</div>
</section>
<section id="about-pma-gps-data-3" class="slide level2" data-auto-animate="true" data-visibility="uncounted">
<h2 data-id="quarto-animate-title">About PMA GPS data</h2>
<div class="columns">
<div class="column" style="width:60%;">
<div style="opacity:0.5">
<p>PMA uses spatially referenced sample clusters - called “enumeration areas” (EAs) - sampled by probability proportional to population size.</p>
<p>At the beginning of the panel study, 35 households were randomly selected within each EA.</p>
<p>IPUMS PMA does not disseminate the GPS coordinates for EAs, but you may <a href="https://www.pmadata.org/data/request-access-datasets">apply here</a> for access directly from PMA.</p>
<p>Today, we’ll be using <strong>falsified</strong> GPS coordinates as an example.</p>
</div>
<p>The coordinates represent the <span style="color:red"><strong>centroid</strong></span> of an enumeration area, <em>not</em> the location of any sampled household.</p>
</div><div class="column" style="width:40%;">
<p><img data-src="images/pma/gps2.png" class="absolute" style="top: 300px; right: 0px; height: 300px; "></p>
</div>
</div>
</section>
<section id="load-pma-gps-data-into-r" class="slide level2">
<h2>Load PMA GPS data into R</h2>
<div class="fragment">
<p>A PMA GPS dataset is a simple CSV file with one row per EA, and columns containing latitude and longitude points.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb8"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb8-1"><a href="#cb8-1"></a>gps <span class="ot"><-</span> <span class="fu">read_csv</span>(<span class="st">"data/pma_gps.csv"</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</div>
<div class="fragment">
<div class="cell">
<div class="cell-output cell-output-stdout">
<pre><code># A tibble: 167 × 8
PMACC PMAYEAR REGION EAID GPSLONG GPSLAT DATUM SURVEY
<chr> <dbl> <chr> <dbl> <dbl> <dbl> <chr> <chr>
1 BF 2020 8. est 854181006 -0.160 13.4 WGS84 PMA
2 BF 2020 3. centre 854131035 -1.47 12.4 WGS84 PMA
3 BF 2020 6. centre_ouest 854161005 -1.92 11.1 WGS84 PMA
4 BF 2020 10. nord 854201013 -2.54 12.9 WGS84 PMA
5 BF 2020 9. hauts_bassins 854191041 -4.23 11.2 WGS84 PMA
6 BF 2020 2. cascades 854121002 -4.84 10.3 WGS84 PMA
7 BF 2020 6. centre_ouest 854161009 -2.20 12.8 WGS84 PMA
8 BF 2020 8. est 854181005 -0.0319 12.5 WGS84 PMA
9 BF 2020 10. nord 854201005 -1.90 12.9 WGS84 PMA
10 BF 2020 9. hauts_bassins 854191026 -5.24 11.4 WGS84 PMA
# … with 157 more rows</code></pre>
</div>
</div>
</div>
<div class="fragment">
<p>The column <code>DATUM</code> describes the coordinate reference system: World Geodetic System 1984.</p>
</div>
</section>
<section id="gps-data-as-a-simple-features-object" class="slide level2">
<h2>GPS data as a Simple Features Object</h2>
<div class="columns">
<div class="column" style="width:75%;">
<div class="fragment">
<p>The <a href="https://r-spatial.github.io/sf/index.html">sf</a> (“simple features”) package for R contains many of the same tools you would find in other GIS software</p>
</div>
<div class="fragment">
<div class="cell">
<div class="sourceCode cell-code" id="cb10" data-code-line-numbers="1,2,5"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb10-1"><a href="#cb10-1"></a>gps <span class="ot"><-</span> gps <span class="sc">%>%</span> </span>
<span id="cb10-2"><a href="#cb10-2"></a> <span class="fu">st_as_sf</span>(</span>
<span id="cb10-3"><a href="#cb10-3"></a> <span class="at">coords =</span> <span class="fu">c</span>(<span class="st">"GPSLONG"</span>, <span class="st">"GPSLAT"</span>), </span>
<span id="cb10-4"><a href="#cb10-4"></a> <span class="at">crs =</span> <span class="dv">4326</span></span>
<span id="cb10-5"><a href="#cb10-5"></a> ) </span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</div>
</div><div class="column" style="width:15%;">
<p><img data-src="images/hex/sf.png" class="absolute" style="top: 90px; right: 0px; height: 200px; "></p>
</div>
</div>
</section>
<section id="gps-data-as-a-simple-features-object-1" class="slide level2" data-auto-animate="true" data-visibility="uncounted">
<h2 data-id="quarto-animate-title">GPS data as a Simple Features Object</h2>
<div class="columns">
<div class="column" style="width:75%;">
<p>The <a href="https://r-spatial.github.io/sf/index.html">sf</a> (“simple features”) package for R contains many of the same tools you would find in other GIS software</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb11" data-code-line-numbers="3-4"><pre class="sourceCode numberSource r number-lines code-with-copy" data-id="quarto-animate-code"><code class="sourceCode r hljs"><span id="cb11-1" class="hljs-ln-code"><a href="#cb11-1"></a>gps <span class="ot"><-</span> gps <span class="sc">%>%</span> </span>
<span id="cb11-2" class="hljs-ln-code"><a href="#cb11-2"></a> <span class="fu">st_as_sf</span>(</span>
<span id="cb11-3" class="hljs-ln-code"><a href="#cb11-3"></a> <span class="at">coords =</span> <span class="fu">c</span>(<span class="st">"GPSLONG"</span>, <span class="st">"GPSLAT"</span>), </span>
<span id="cb11-4" class="hljs-ln-code"><a href="#cb11-4"></a> <span class="at">crs =</span> <span class="dv">4326</span></span>
<span id="cb11-5" class="hljs-ln-code"><a href="#cb11-5"></a> ) </span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<div class="fragment">
<p><code>4326</code> is the <a href="https://epsg.io/4326">EPSG</a> code for World Geodetic System 1984.</p>
</div>
<div class="fragment">
<div class="cell">
<div class="cell-output cell-output-stdout">
<pre><code>Simple feature collection with 167 features and 6 fields
Geometry type: POINT
Dimension: XY
Bounding box: xmin: -5.277929 ymin: 10.29263 xmax: 0.6744602 ymax: 14.21399
Geodetic CRS: WGS 84
# A tibble: 167 × 7
PMACC PMAYEAR REGION EAID DATUM SURVEY geometry
* <chr> <dbl> <chr> <dbl> <chr> <chr> <POINT [°]>
1 BF 2020 8. est 8.54e8 WGS84 PMA (-0.1595212 13.36634)
2 BF 2020 3. centre 8.54e8 WGS84 PMA (-1.467466 12.43239)
3 BF 2020 6. centre_ouest 8.54e8 WGS84 PMA (-1.915129 11.13271)
4 BF 2020 10. nord 8.54e8 WGS84 PMA (-2.542757 12.88571)
5 BF 2020 9. hauts_bassins 8.54e8 WGS84 PMA (-4.232418 11.19971)
6 BF 2020 2. cascades 8.54e8 WGS84 PMA (-4.83967 10.29263)
7 BF 2020 6. centre_ouest 8.54e8 WGS84 PMA (-2.204062 12.75554)
8 BF 2020 8. est 8.54e8 WGS84 PMA (-0.03191096 12.45061)
9 BF 2020 10. nord 8.54e8 WGS84 PMA (-1.895065 12.90935)
10 BF 2020 9. hauts_bassins 8.54e8 WGS84 PMA (-5.239322 11.37056)
# … with 157 more rows</code></pre>
</div>
</div>
</div>
</div><div class="column" style="width:15%;">
<p><img data-src="images/hex/sf.png" class="absolute" style="top: 90px; right: 0px; height: 200px; "></p>
</div>
</div>
</section>
<section id="adding-a-shapefile" class="slide level2">
<h2>Adding a Shapefile</h2>
<div class="fragment">
<p>We need a supplementary <code>shape</code> file to see where each point lies on a map of Burkina Faso.</p>
</div>
<div class="fragment">
<p>You only need to specify the folder: R will locate the appropriate file.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb13"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb13-1"><a href="#cb13-1"></a>shape <span class="ot"><-</span> <span class="fu">st_read</span>(<span class="st">"data/geobf"</span>) <span class="sc">%>%</span> <span class="fu">select</span>(ADMIN_NAME)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</div>
<div class="fragment">
<div class="cell">
<div class="cell-output cell-output-stdout">
<pre><code>Simple feature collection with 13 features and 1 field
Geometry type: MULTIPOLYGON
Dimension: XY
Bounding box: xmin: -5.521112 ymin: 9.393889 xmax: 2.404293 ymax: 15.08511
Geodetic CRS: WGS 84
First 10 features:
ADMIN_NAME geometry
1 Boucle du Mouhoun MULTIPOLYGON (((-3.206306 1...
2 Cascades MULTIPOLYGON (((-5.388849 1...
3 Centre MULTIPOLYGON (((-1.565052 1...
4 Centre-Est MULTIPOLYGON (((-0.2517975 ...
5 Centre-Nord MULTIPOLYGON (((-0.6722373 ...
6 Centre-Ouest MULTIPOLYGON (((-2.547486 1...
7 Centre-Sud MULTIPOLYGON (((-1.470801 1...
8 Est MULTIPOLYGON (((0.06834642 ...
9 Hauts-Bassins MULTIPOLYGON (((-4.483203 1...
10 Nord MULTIPOLYGON (((-2.952616 1...</code></pre>
</div>
</div>
</div>
</section>
<section id="mapping-gps-coordinates" class="slide level2" data-auto-animate="true">
<h2 data-id="quarto-animate-title">Mapping GPS coordinates</h2>
<div class="fragment">
<div class="cell">
<div class="sourceCode cell-code" id="cb15"><pre class="sourceCode numberSource r number-lines code-with-copy" data-id="quarto-animate-code"><code class="sourceCode r hljs"><span id="cb15-1" class="hljs-ln-code"><a href="#cb15-1"></a><span class="fu">ggplot</span>() <span class="sc">+</span> </span>
<span id="cb15-2" class="hljs-ln-code"><a href="#cb15-2"></a> <span class="fu">layer_spatial</span>(gps) <span class="sc">+</span> </span>
<span id="cb15-3" class="hljs-ln-code"><a href="#cb15-3"></a> <span class="fu">theme_minimal</span>() </span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</div>
<div class="fragment">
<div class="cell">
<div class="cell-output-display">
<p><img data-src="slides_files/figure-revealjs/unnamed-chunk-18-1.png" width="960"></p>
</div>
</div>
</div>
</section>
<section id="mapping-gps-coordinates-1" class="slide level2" data-auto-animate="true">
<h2 data-id="quarto-animate-title">Mapping GPS coordinates</h2>
<div class="cell">
<div class="sourceCode cell-code" id="cb16" data-code-line-numbers="3"><pre class="sourceCode numberSource r number-lines code-with-copy" data-id="quarto-animate-code"><code class="sourceCode r hljs"><span id="cb16-1" class="hljs-ln-code"><a href="#cb16-1"></a><span class="fu">ggplot</span>() <span class="sc">+</span> </span>
<span id="cb16-2" class="hljs-ln-code"><a href="#cb16-2"></a> <span class="fu">layer_spatial</span>(gps) <span class="sc">+</span> </span>
<span id="cb16-3" class="hljs-ln-code"><a href="#cb16-3"></a> <span class="fu">layer_spatial</span>(shape, <span class="at">alpha =</span> <span class="dv">0</span>) <span class="sc">+</span> </span>
<span id="cb16-4" class="hljs-ln-code"><a href="#cb16-4"></a> <span class="fu">theme_minimal</span>() </span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<img data-src="slides_files/figure-revealjs/unnamed-chunk-20-1.png" width="960" class="r-stretch quarto-figure-center"></section>
<section id="pma-displacement-protocol" class="slide level2">
<h2>PMA displacement protocol</h2>
<div class="fragment">
<p>In fact, these GPS coordinates are <em>not</em> the actual centroid of each EA.</p>
</div>
<div class="fragment">
<div style="text-align: center; margin-top: 1em">
<p><img data-src="images/displacement.png" height="400"></p>
</div>
<p>In order to preserve confidentiality, PMA displaces the centroid location of each EA up to 2 km (urban areas) or 5 km (rural areas).</p>
<p>Displacement does not cross admin 1 boundaries.</p>
</div>
</section>
<section class="slide level2">
<div style="display: flex; align-items: center; height: 90%">
<div class="columns">
<div class="column" style="width:50%;">
<h2>
Meters on a Round Plant
</h2>
<div class="fragment">
<p>Remember: the <code>geometry</code> of our <code>gps</code> data is defined by arc-degrees, not meters.</p>
</div>
<div class="fragment">
<p><span style="color: #98579B">If we tried to account displacement in meters without “flattening” our map, the length of one meter vary based on distance from the equator.</span></p>
</div>
</div><div class="column" style="width:50%;">
</div>
</div>
</div>
<p><img data-src="images/projection.gif" class="absolute" style="top: 0px; right: 50px; height: 600px; "></p>
</section>
<section id="projection-to-meters" class="slide level2">
<h2>Projection to Meters</h2>
<div class="fragment">
<p>We’ll use <a href="https://epsg.io/32630">EPSG code 32630</a> to focus our flat projection around Burkina Faso.</p>
</div>
<div class="fragment">
<div class="cell">
<div class="sourceCode cell-code" id="cb17"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb17-1"><a href="#cb17-1"></a>gps <span class="ot"><-</span> gps <span class="sc">%>%</span> <span class="fu">st_transform</span>(<span class="at">crs =</span> <span class="dv">32630</span>)</span>
<span id="cb17-2"><a href="#cb17-2"></a>shape <span class="ot"><-</span> shape <span class="sc">%>%</span> <span class="fu">st_transform</span>(<span class="at">crs =</span> <span class="dv">32630</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</div>
<div class="fragment">
<div class="cell">
<div class="cell-output cell-output-stdout">
<pre><code>Simple feature collection with 167 features and 6 fields
Geometry type: POINT
Dimension: XY
Bounding box: xmin: 250808.3 ymin: 1138345 xmax: 899207.2 ymax: 1573191
Projected CRS: WGS 84 / UTM zone 30N
# A tibble: 167 × 7
PMACC PMAYEAR REGION EAID DATUM SURVEY geometry
* <chr> <dbl> <chr> <dbl> <chr> <chr> <POINT [m]>
1 BF 2020 8. est 8.54e8 WGS84 PMA (807680.7 1479413)
2 BF 2020 3. centre 8.54e8 WGS84 PMA (666577.8 1374847)
3 BF 2020 6. centre_ouest 8.54e8 WGS84 PMA (618468.7 1230870)
4 BF 2020 10. nord 8.54e8 WGS84 PMA (549607.1 1424541)
5 BF 2020 9. hauts_bassins 8.54e8 WGS84 PMA (365447.7 1238343)
6 BF 2020 2. cascades 8.54e8 WGS84 PMA (298530.9 1138345)
7 BF 2020 6. centre_ouest 8.54e8 WGS84 PMA (586398.8 1410234)
8 BF 2020 8. est 8.54e8 WGS84 PMA (822688.7 1378185)
9 BF 2020 10. nord 8.54e8 WGS84 PMA (619870.7 1427369)
10 BF 2020 9. hauts_bassins 8.54e8 WGS84 PMA (255620.7 1257895)
# … with 157 more rows</code></pre>
</div>
</div>
</div>
<div class="fragment">
<p>This changes the <code>geometry</code> column to meters <code>[m]</code>.</p>
</div>
</section>
<section id="creating-buffers" class="slide level2">
<h2>Creating Buffers</h2>
<div class="fragment">
<p>To keep things simple in our example, we’ll give every EA a 5 km buffer.</p>
</div>
<div class="fragment">
<div class="cell">
<div class="sourceCode cell-code" id="cb19"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb19-1"><a href="#cb19-1"></a>gps_buffer <span class="ot"><-</span> gps <span class="sc">%>%</span> <span class="fu">st_buffer</span>(<span class="dv">5000</span>)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</div>
<div class="fragment">
<div class="cell">
<div class="cell-output cell-output-stdout">
<pre><code>Simple feature collection with 167 features and 6 fields
Geometry type: POLYGON
Dimension: XY
Bounding box: xmin: 245808.3 ymin: 1133345 xmax: 904207.2 ymax: 1578191
Projected CRS: WGS 84 / UTM zone 30N
# A tibble: 167 × 7
PMACC PMAYEAR REGION EAID DATUM SURVEY geometry
* <chr> <dbl> <chr> <dbl> <chr> <chr> <POLYGON [m]>
1 BF 2020 8. est 8.54e8 WGS84 PMA ((812680.7 1479413, 8126…
2 BF 2020 3. centre 8.54e8 WGS84 PMA ((671577.8 1374847, 6715…
3 BF 2020 6. centre_ouest 8.54e8 WGS84 PMA ((623468.7 1230870, 6234…
4 BF 2020 10. nord 8.54e8 WGS84 PMA ((554607.1 1424541, 5546…
5 BF 2020 9. hauts_bassins 8.54e8 WGS84 PMA ((370447.7 1238343, 3704…
6 BF 2020 2. cascades 8.54e8 WGS84 PMA ((303530.9 1138345, 3035…
7 BF 2020 6. centre_ouest 8.54e8 WGS84 PMA ((591398.8 1410234, 5913…
8 BF 2020 8. est 8.54e8 WGS84 PMA ((827688.7 1378185, 8276…
9 BF 2020 10. nord 8.54e8 WGS84 PMA ((624870.7 1427369, 6248…
10 BF 2020 9. hauts_bassins 8.54e8 WGS84 PMA ((260620.7 1257895, 2606…
# … with 157 more rows</code></pre>
</div>
</div>
</div>
<div class="fragment">
<p>Now, <code>geometry</code> contains several points on the circumference of a round polygon.</p>
</div>
</section>
<section id="intersecting-regional-boundaries" class="slide level2">
<h2>Intersecting Regional Boundaries</h2>
<div style="display: flex; align-items: center; height: 90%">
<div class="columns">
<div class="column" style="width:40%;">
<div class="fragment">
<p>In certain cases, a buffer may cross an admin 1 boundary in <code>shape</code>.</p>
</div>
<div class="fragment">
<p>For example, we’ll look at enumeration area <code>854131009</code></p>
<div class="cell">
<div class="sourceCode cell-code" id="cb21"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb21-1"><a href="#cb21-1"></a>test_ea <span class="ot"><-</span> <span class="dv">854131009</span> </span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</div>
</div><div class="column" style="width:60%;">
<div class="fragment">
<div class="cell" data-layout-align="center">
<div class="cell-output-display">
<div class="quarto-figure quarto-figure-center">
<figure>
<p><img data-src="slides_files/figure-revealjs/unnamed-chunk-26-1.png" width="384"></p>
</figure>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</section>
<section id="intersecting-regional-boundaries-1" class="slide level2">
<h2>Intersecting Regional Boundaries</h2>
<div style="display: flex; align-items: center; height: 90%">
<div class="columns">
<div class="column" style="width:40%;">
<p>In certain cases, a buffer may cross an admin 1 boundary in <code>shape</code>.</p>
<p>For example, we’ll look at enumeration area <code>854131009</code></p>
<div class="cell">
<div class="sourceCode cell-code" id="cb22"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb22-1"><a href="#cb22-1"></a>test_ea <span class="ot"><-</span> <span class="dv">854131009</span> </span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>Keep only the segment containing the original centroid.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb23"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb23-1"><a href="#cb23-1"></a>gps_buffer <span class="ot"><-</span> gps_buffer <span class="sc">%>%</span> </span>
<span id="cb23-2"><a href="#cb23-2"></a> <span class="fu">st_intersection</span>(shape) <span class="sc">%>%</span> </span>
<span id="cb23-3"><a href="#cb23-3"></a> <span class="fu">st_filter</span>(gps)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</div><div class="column" style="width:60%;">
<div class="cell" data-layout-align="center">
<div class="cell-output-display">
<div class="quarto-figure quarto-figure-center">
<figure>
<p><img data-src="slides_files/figure-revealjs/unnamed-chunk-29-1.png" width="384"></p>
</figure>
</div>
</div>
</div>
</div>
</div>
</div>
</section>
<section id="intersecting-regional-boundaries-2" class="slide level2">
<h2>Intersecting Regional Boundaries</h2>
<div style="display: flex; align-items: center; height: 90%">
<div class="columns">
<div class="column" style="width:40%;">
<p>In certain cases, a buffer may cross an admin 1 boundary in <code>shape</code>.</p>
<p>For example, we’ll look at enumeration area <code>854131009</code></p>
<div class="cell">
<div class="sourceCode cell-code" id="cb24"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb24-1"><a href="#cb24-1"></a>test_ea <span class="ot"><-</span> <span class="dv">854131009</span> </span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
<p>Keep only the segment containing the original centroid.</p>
<div class="cell">
<div class="sourceCode cell-code" id="cb25"><pre class="sourceCode numberSource r number-lines code-with-copy"><code class="sourceCode r"><span id="cb25-1"><a href="#cb25-1"></a>gps_buffer <span class="ot"><-</span> gps_buffer <span class="sc">%>%</span> </span>
<span id="cb25-2"><a href="#cb25-2"></a> <span class="fu">st_intersection</span>(shape) <span class="sc">%>%</span> </span>
<span id="cb25-3"><a href="#cb25-3"></a> <span class="fu">st_filter</span>(gps)</span></code><button title="Copy to Clipboard" class="code-copy-button"><i class="bi"></i></button></pre></div>
</div>
</div><div class="column" style="width:60%;">
<div class="cell" data-layout-align="center">
<div class="cell-output-display">
<div class="quarto-figure quarto-figure-center">
<figure>
<p><img data-src="slides_files/figure-revealjs/unnamed-chunk-32-1.png" width="384"></p>
</figure>
</div>
</div>