title: Is there a substitute for "sf" package?
body: <p>I´m trying to find a package similar to "sf" so I can: </p>
  
  <ol>
  <li>Define the coordinates from a shape database as when I use "st_as_sf".</li>
  <li>Define the specific coordinates characteristics as when I use "st_transform".</li>
  </ol>
  
  <p>I need a replacement for "sf" because I haven´t been able to install it on my computer. </p>
  
  <p>Many thanks in advance!</p>
  
  <pre><code>Scoor &lt;- st_as_sf(DataBase, coords = c("Longitude",                                              
  "Latitude"), crs = 4326) 
  Scoor &lt;- st_transform(Scoor, "+proj=utm +zone=15N +ellps=GRS80 +datum=NAD83") 
  </code></pre>