I'm trying to manipulate an .IGE file, which I understand is a raster data format developed by Erdas Imagine. The data I've downloaded is the National Land Cover Database (NLCD) 2006 Percent Developed Imperviousness data, available here: http://www.mrlc.gov/nlcd06_data.php
I've tried using winzip and winrar to unzip the file, both of which bring up error messages during the unzipping process. Files do appear, however, in the folder I have designated for extracting the files, including an .IMG file. I can load this .IMG file into ArcMAP 10.1 and QGIS 1.8.0. In either of those programs, I can view the image, but I can't clip it to a shapefile, lest error messages appear. I have tried loading this .IMG file into Opticks 4.10.0 32-bit as well, but an error message comes up indicating the opticks cannot find the file it needs to import.
I wonder if I didn't unzip the compressed file properly? Any suggestions will be greatly appreciated, thanks!