I am trying to use the Ground Surface Elevation 30m (href="http://goto.arcgisonline.com/elevation/NED30m) data to do some local processing. I wanted to extract an area and then work with it. But no matter what I do the raster calculator fails with nothing in the output raster. I have checked my environments, I am using a mask, projections are all the same, etc. It takes about an hour to finish (odd I think), the area is less than 50 miles square - this should be a simple process, but after 5 tries I am ready to abandon and just download the data and use it.