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  <h1 class="title">Lecture 24</h1>
  <p class="subtitle">Measures, Predicates, and the DE-9IM</p>

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<h2>Jumping back in …</h2>
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<li>In the last lecture we learned about the <code>sf</code> package and how it relates to the broader spatial ecosystem</li>
<li>We also learned about the <code>sf</code> object and how it is a data.frame with a geometry 