title: R read and plot gdbtable
body: <p>I'm very new to gbd table and today at work I was asked to use R to read the data available on <a href="https://frap.fire.ca.gov/media/9792/fthrt14_2.zip" rel="nofollow noreferrer">https://frap.fire.ca.gov/media/9792/fthrt14_2.zip</a> and plot it using R tools like ggplot and plot_ly.
  My problem is that I don't even understand how to read this data with R.
  These are the stackoverflow questions I read so far:
   - <a href="https://stackoverflow.com/questions/36732055/rgdal-read-a-table-within-a-esri-geodatabase-gdb">rgdal - read a table within a ESRI geodatabase (gdb)</a>
   - <a href="https://stackoverflow.com/questions/37705217/how-to-read-a-table-from-an-esri-file-geodatabase-gdb-using-r">How to read a table from an ESRI file geodatabase (.gdb) using R</a>
   - <a href="https://stackoverflow.com/questions/55910398/how-do-i-get-rgdal-to-open-a-geodatabase-gdb-file">How do I get rgdal to open a geodatabase (.gdb) file?</a>
  however none of them seems to be working.
  These are my steps:
   - I unzipped the file in my C:\temp folder. This means I have an R variable <code>file_gdb = "C:/temp/fthrt14_2.gdb"</code>
   - then, I have <code>fc_list = ogrListLayers(file_gdb )</code> and if I print its content I see: </p>
  
  <pre><code>character(0)
  attr(,"driver")
  [1] "OpenFileGDB"
  attr(,"nlayers")
  [1] 0
  </code></pre>
  
  <ul>
  <li><p>at this point I try <code>fc = readOGR(dsn=fgdb,layer="OpenFileGDB")</code> but I get the following error:</p>
  
  <p>Error in ogrInfo(dsn = dsn, layer = layer, encoding = encoding, use_iconv = use_iconv
  Cannot open layer</p></li>
  </ul>
  
  <p>and from here I'm quite lost.
  Any help would be much appreciated. Many thanks from a complete newbie.</p>