Polarization is defined as the oscillating direction involved in an electric field,Usually transmitted microwave and received microwave will have a choice between horizontal polarization and vertical polarization,Therefore four combinations: HH,HV,VH and VV can be used for SAR. The backscatter chracteristics are also different with respect to polarization. Figure 4.6.2, 4.6.4 and 4.5.6 are HH,HV,and VV combinations respectively with L band in which one can see different features