2820 How does FLAASH define bad bands? ENVI's FLAASH module will calculate an approximate solar black body radiance as a function of the hyperspectral channel, and compare it to the brightest MODTRAN calculation for each channel. When the MODTRAN result is less than .05 of the solar radiance, the band is set as 'bad' in the file header. Review on 12/31/2013 MM How to programmatically convert EVF files to ROIs How does off-nadir geometry affect the calculations of water vapor and aerosols