title: Raster Non-NA Cell Count
body: <p>This question was asked once in the past (from what I could find), but the only response did not provide a solution. Within a RasterStack, I want to generate summary statistics for each raster (min, max, mean, SD), AND the number of cells included in these calculations (i.e., non-NA cell count). You might think the number would be the same for every raster if they are all the same extent and resolution, but these rasters have been masked by their respective QA layers, resulting in a different number of non-NA cells in each raster layer. I've been using cellStats, but that does not provide cell count as output. I could also use zonal stats, but that does not appear to have this functionality (from what I read). Does anyone know how to add this to my output?</p>
  
  <p>Thanks</p>