I assert that the problem is a result of the USGS including the COUNT field (and LAND_COVER field in Land Cover product) as part of the colormap for the .img, .tif, and .jpg Land Cover image tiles they provide via the National Map download option. I further assert that some of the values of the COUNT field exceed the maximum 32-bit signed long int value of 2**31 (2,147,483,648). It wasn't until I deleted the COUNT field from my *.tif file that I was able to convert the TIFF into a GRID. Jim Zack Xtra-Spatial Productions, LLC
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