Comments: This is an example of a SAR image. The imaged area is the volcano Mount Etna in Italy, seen by the SIR-C sensor mounted on the space shuttle in X-band (2.5cm wavelength). On the left side the amplitude of the complex image is displayed, on the right side its phase. Obviously the image phase shows no recognizable structure. Except the scene features, it is remarkable that the amplitude is brighter on the left side of the mountain than on the right side. This is due to the look direction of the radar from the left side. Surface slopes towards the radar increase the backscattering, those away from the radar cause a decreasing amplitude.