The Potential of Spaceborne GNSS Reflectometry for Soil Moisture, Biomass, and Freeze–Thaw Monitoring: Summary of a European Space Agency-Funded Study

Nazzareno Pierdicca, Davide Comite, Adriano Camps, Hugo Carreno-Luengo, Luca Cenci, Maria Paola Clarizia, Fabiano Costantini, Laura Dente, Leila Guerriero, Antonio Mmollfulleda, Simonetta Paloscia, Hyuk Park (+3 others)
2021 IEEE Geoscience and Remote Sensing Magazine  
This work presents an overview of the activity developed in the frame of a project funded by the European Space Agency. The research was focused on the study of the potential applications of Global Navigation Satellite System Reflectometry (GNSS-R) over land, with emphasis on soil moisture and biomass. A study about the sensitivity with respect to the freeze-thaw dynamics was considered as well. The work started with an analysis of the sensitivity of GNSS-R reflectivity collected by the
more » ... SAT-1 experimental satellite. Although to a limited extent, the CyGNSS (Cyclone Global Navigation Satellite System) constellation was considered as well. The encouraging sensitivity outcomes led to the development of retrieval algorithms, three different approaches for soil moisture and one for biomass based on neural networks. A more theoretical investigation was carried out to better understand and predict the signal from a satellite platform, which required to update two different models. Topography effects and sensitivity to moisture and roughness of a rough soil were included, as well as the effect of vegetation cover. The project was carried out by a large team involving different research groups in Europe. It has led to main conclusions and recommendations derived from a beneficial collaboration and fertilization of ideas. The main approaches and outcomes are summarized here also in comparison to the recent literature.
doi:10.1109/mgrs.2021.3115448 fatcat:tyhtbaxhpfagvhj65qwgl7hzya