Hello all; I am a new ENVI user and  I am working with hyperspectral images of clouds, trying to work out the reflectivity structure of the imaged clouds using Fourier analysis. I need to build a time series of radiance values along a certain transect of a flight for a set of different spectral bands. I have an array of pixels each containing the spectra of 252 bands from 400 to 970 nm. What I would need  in order to build the time series is the mean radiance value per band per pixel. From the software I can get the mean radiance values of the different bands for the entire array (i.e., the array's mean spectrum), but I have not found it on the help files how to extract that information for individual pixels. Any ideas? Your help is much appreciated.   Lorenzo.