Hi, I am working with L5 TM and P6 LISS III. I intend to aplly FLAASH in the images. So, the input image in FLAASH is radiance. For Landsat 5 TM I can do this directly on ENVI menu (calibration utilities) filling the solar elevation and date parameters. But for P6 LIS III there aren't any directly option (I guess). So, I can calculate the radiance from DN using the equation: Lmin + [(Lmin + Lmax)*Qcal/Qcalmax] This equation will return a radiance image. But, in the equation above there aren't correction for solar elevation angle and in the calibration utilities menu applied on L5 TM I think that this effect is compensated. Then, my doubt is: The radiance image input for FLAASH should be corrected for solar elevation? Tahnk you, Elias