For reflective bands the corrected signal (dn**) is scaled to a range of 0 to 32767, and reflectance or radiance values are recovered by applying the appropriate calibration coefficients. For some reflective bands (currently 8 - 19 and 26), negative radiances are recorded in order to preserve all potentially useful data.

Each pixel has an assigned Uncertainty Index (UI), which is usually scalable to uncertainty in percent of reflectance. If a pixel is unusable, the UI will be set to 15; in this case the calculated uncertainty will not be correct. For each pixel having negative reflectance, the UI is set to 15.

In brief, the Uncertainty Index should be taken into account when evaluating data; pixels with a UI of 15 should not be used.