title: Trouble converting a large raster to polygon using R
body: <p>I have a rather large raster (384 MB) that I am trying to convert to a polygon shapefile in R.
  The <code>rastertoPolygons</code> function from the raster package doesn't seem to be able to handle this, as I tried running it but gave up after it was going for 7+ hours.</p>
  <p>I also tried to use gdal_polygonize.py from GDAL in python via <a href="https://gist.github.com/johnbaums/26e8091f082f2b3dd279" rel="nofollow noreferrer">this function by John Baumgartner</a> but after letting the function run for 30+ minutes I still have nothing. Am I simply not letting it run long enough? I was under the impression that gdal_polyonize.py was supposed to be very quick, i.e. seconds.</p>
  <p><a href="https://www.dropbox.com/s/0tnzl64vgql5ltv/top6loss.tif?dl=0" rel="nofollow noreferrer">Here's a link to my raster file.</a></p>
  <p>Any guidance would be greatly appreciated.</p>