ml" class="external-link">merge</a></span><span class="op">(</span><span class="va">sf_bna1</span>, <span class="va">nydata</span>, by<span class="op">=</span><span class="st">"AREAKEY"</span><span class="op">)</span></span>
<span><span class="va">sf_bna2_utm18</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://r-spatial.github.io/sf/reference/st_transform.html" class="external-link">st_transform</a></span><span class="op">(</span><span class="va">sf_bna2</span>, <span class="st">"+proj=