PROJECT TITLE :

Validity Regions of Soil Moisture Retrieval on the $mbox$– $theta$ Plane for Agricultural Fields at L-, C-, and X-Bands

ABSTRACT:

To quantitatively examine the sensitivity of the soil moisture retrieval over agricultural fields, initial, we have a tendency to generated a database of radar backscattering coefficients using the first-order vector radiative transfer model for numerous leaf area indices (LAIs), incidence angles, frequencies, and polarizations. Then, soil moisture contents were retrieved from the backscattering coefficients of the database using the water–cloud model (WCM) and Oh et al.'s scattering model. Based on the sensitivity examination for $mboxLAI$ and $theta$ (incidence angle) on soil moisture retrieval, we propose validity regions of soil moisture retrieval over agricultural fields on the $mboxLAI$– $theta$ plane at L-, C-, and X-bands for vv- and hh-polarizations in the form of $theta_mathrmFpp < - A_mathrmFppmboxLAI+theta_0,mathrmFpp$ , where the constants $A_mathrmFpp$ and $theta_0,mathrmFpp$ are determined during this letter for $F$-frequency band and pp-polarization. The validity regions were verified with inversion results from artificial aperture radar (SAR) information of bean and wheat fields.