I tried to read a 2001 NLCD .img files located at http://edcftp.cr.usgs.gov/pub/data/landcover/nlcd2001/superzones/ Here's what happened: r.in.gdal in=landcover13_011007_0fix.img out=zn13 ERROR 4: `landcover13_011007_0fix.img' not recognised as a supported file format I thought gdal supported this format?