Different surface features exhibit different scattering characteristics:
Urban areas: very strong backscatter
Forest: medium backscatter
Calm water: smooth surface, low backscatter
Rough sea: increased backscatter due to wind and current effects
The average backscattering coefficient differs according to the types of surface, so it may be reasonably expected that surfaces with different values
of would produce different grey levels in the image.

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry