ABSTRACT
In this chapter, the double-bounce scattering phenomena by metal and dielectric dihedral structures are examined in detail. If the dihedral is placed normal to radar illumination, it acts as a double-bounce scatterer. However, it does not act as a double-bounce reflector anymore when obliquely placed to the radar illumination.
We can see very strong double-bounce scattering power in actual PolSAR images in urban areas, buildings, man-made structures, tall vegetation such as corn, ships on the sea, etc. Since the power is strong compared to those of the surrounding area, it is easier to find man-made objects. If there is a reduction of the power after a disaster, it means the area is damaged or collapsed. Therefore, reduction also becomes an indicator for identifying a disaster area.
If the L-band SAR is used for flood monitoring in rainforest area, it is very easy to identify the inundated place.
