I have downloaded an image which is level 3B processed (so I already have surface reflectance), but my assignment is to compare the data values of the SR file with my results. At first I applied radiometric calibration in the AnalyticMS file and then tried to put the result in FLAASH but it didn't work. From what I read, I realised that the AnalyticMS is already calibrated but it is not in a BIL/BIP format that FLAASH needs. So do I need to convert this file (.tif) in BIL/BIP format and then apply FLAASH? And if so, how do I do the conversion?