Figure.4. Correlative plots for Surface Electrical Conductivity and VH
backscatter (A to C) and VV polarization backscatter (D to F)
since SAR waves interact with the surface, but it’s the root zone soil
salinity that affects the plant growth hence its important to establish
a correlation between surface soil salinity that interacts with the
RADAR waves and the root zone soil salinity. This is done to establish
an indirect relation between RADAR backscatter and root zone electrical
conductivity (which is indicative of soil salinity). So that, satellite
data could be used for modelling and estimation of soil salinity in root
zone.
Figure 5, shows the correlative relation between surface EC and root
zone EC.