Sentinel-1 sensitivity to soil moisture at high incidence angle and its impact on retrieval
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Palmisano Davide, Balenzano Anna, Satalino Giuseppe, Mattia Francesco, Pierdicca Nazzareno, Monti-Guarnieri Andrea
This paper presents an experimental sensitivity analysis of Sentinel-1 (S-1) backscatter to soil moisture (SM) content observed at low (i.e., ~33°) and high (i.e., ~45°) incidence angles over five agricultural fields of an experimental farm located in the Puglia region (Italy). The analysis focuses on the period from March to June 2017 during which 38 S-1 images along ascending orbits were acquired over the site. Results indicate a slight decrease in the radar sensitivity to SM going from low to high incidence with an impact on SM retrieval error that increases from ~5.65 m 3 /m 3 % to ~7.63 m 3 /m 3 %.