 reference system from sf or sfc object</p></li>
<li><p><em>st_set_crs</em> : Set or replace coordinate reference system from object</p></li>
<li><p><em>st_transform</em> : Transform or convert coordinates of simple feature</p></li>
<li><p>Again, “st” (like PostGIS) denotes it is an operation that can work on a ” <em>s</em> patial <em>t</em> ype”</p></li>
</ul>
</section>
<section id="geographic-coordinate-systms-gcs" class="slide level2">
<h2>Geographic Coordinate Systms (GCS)</h2>
<ul>
<li><p>A GC