研究目的

To study the potential of synthetic aperture radar (SAR) for mapping and monitoring of the spatio-temporal dynamics of soil salinity using interferometry.

研究成果

The study showed that it is possible to estimate the temporal change in soil electrical conductivity (EC) from SAR images through the InSAR technique. The radar signal is more sensitive to soil salinity in HH polarization using a small incidence angle. However, for the HV polarization, a large angle of incidence is more suitable. The results could be useful for future research on the use of interferometric data to monitor soil salinization. However, several refinements must be considered to obtain better results, such as increasing the number of soil samples collected, quantifying the roughness of the surface, testing the 'soil texture' in addition to its EC, and using the same radar image configurations for the other study sites.

研究不足

1. The low soil moisture content during the first period could explain the inefficiency of the SAR tool in the measurement of EC. 2. The change detected by the SAR image could be explained by other biophysical parameters (roughness, moisture, etc.). 3. The 4-day time lag between the SAR image acquisition and the field campaigns may have influenced the results. 4. The sample size was small, which could affect the accuracy of the estimates. 5. The roughness of the surface was not quantified, which is necessary for achieving the desired degree of accuracy. 6. The 'soil texture' was not tested in addition to its EC. 7. The same radar image configurations (incidence mode) were not used for the other study sites.