Gruber, A.; De Lannoy, G.; Albergel, C.; Al-Yaari, A.; Brocca, L.; Calvet, J. C.; Colliander, A.; Cosh, M.; Crow, W.; Dorigo, W.; Draper, C.; Hirschi, M.; Kerr, Y.; Konings, A.; Lahoz, W.; McColl, K.; Montzka, C.; Muñoz-Sabater, J.; Peng, J.; Reichle, R.; Richaume, P.; Rüdiger, C.; Scanlon, T.; van der Schalie, R.; Wigneron, J. P.; Wagner, W., 2020, Validation practices for satellite soil moisture retrievals_ What are (the) errors?, Remote sensing of environment 244 (2020). doi_10.1016/j.rse.2020.111806,
URL: http://www.cnr.it/prodotto/i/424823

This paper presents a community effort to develop good practice guidelines for the validation of global coarse-scale satellite soil moisture products. We provide theoretical background, a review of state-of-the-art methodologies for estimating errors in soil moisture data sets, practical recommendations on data pre-processing and presentation of statistical results, and a recommended validation protocol that is supplemented with an example validation exercise focused on microwave-based surface soil moisture products. We conclude by identifying research gaps that should be addressed in the near future.

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