The spectral resolution of a sensor system is the number and width of spectral bands in the
sensing device. The simplest form of spectral resolution is a sensor with one band only, which
senses visible light. An image from this sensor would be similar in appearance to a black and
white photograph from an aircraft. A sensor with three spectral bands in the visible region of the
EM spectrum would collect similar information to that of the human vision system. The Landsat
TM sensor has seven spectral bands located in the visible and near to mid infrared parts of the
spectrum.