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## How are Radiances calculated?The values given for GAIN and BIAS in the header are not the GAIN and BIAS as expected. These values are L_min and L_max, given in units of mW/(cm*cm)/str/micron, where BIAS is L_min and GAIN is L_max. D L_rad = ------- * ( L_max - L_min ) + L_min G_max where: L_rad is the radiance G_max = (2 ^ Q) - 1 Exception: G_max = 255 for IRS-1C and IRS-1D radiometrically corrected and higher level products. L_max is the maximum saturation radiance L_min is the minimum saturation radiance D is the DN from the image Q is the number of quantisation bits of the sensor |