Validation practices for satellite soil moisture retrievals: What are (the) errors?

Gruber, A. ; De Lannoy, G. ; Albergel, Clément ; Al-Yaari, A. ; Brocca, L. ; Calvet, Jean-Christophe ; 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.

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.</p>

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