Hi, I'm using ENVI 5.1 and FLAASH for correct Hyperion images. The FLAASH run well but checking the journal file I had same issue. This is the menssage generated. "Warning: water column calculation used invalid parts of the water column look-up table. Please examine the ACC archive file (.fla) used. You may need to carry out another MODTRAN calculation to extend the humidity range covered. ACC will display a map of the invalid column locations, and store it in "LUTinval.dat" " The algoritm does not create this LUTinval.dat and I can't open .fla file. How do I know which pixels are invalid?