I am wondering whether you have calibrated your QuickBird data using the ENVI tool under Basic Tools > Preprocessing > Calibration Utilities > QuickBird Radiance? If so, did you specify that the output should be in floating point? If so, then your data are in radiance units of mW) / (cm2 *nm*sr), which is what FLAASH expects. If not, then you will need to do that to get your data in the right units. If that's not the problem, let us know, and we might be able to come up with other ideas. That's the most common problem people run into hen using FLAASH. - Peg