title: How can I animate using SPPLOT?
body: <p>I have a shapefile with 5000+ polygons.</p>
  
  <p>I have a netCDF file with timeseries data for several variables with one common key with the shapefile.</p>
  
  <h1>Static Map</h1>
  
  <p>For any particular time, I plot a static map by </p>
  
  <ul>
  <li>Merging netCDF data for one timestep into the shapefile</li>
  <li>Plot the shapefile using <code>spplot</code></li>
  </ul>
  
  <h1>Animation</h1>
  
  <p>Now, I want to create an animation for a small time period.</p>
  
  <p>For <code>ggplot2</code>, there are packages such as gganimate etc.</p>
  
  <p>But, how can I do this using <code>spplot</code>?</p>
  
  <p>P.S. GGPLOT2 is too slow for this purpose. </p>