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A. Gruber, G. De Lannoy, C. Albergel, A. Al-Yaari, L. Brocca, J.C. Calvet, A. Colliander, M. Cosh, W. Crow, W. Dorigo, C. Draper, M. Hirschi, Y. Kerr, A. Konings, W. Lahoz, K. McColl, C. Montzka, J. Muñoz-Sabater, J. Peng, R. Reichle, P. Richaume, C. Rüdiger, T. Scanlon, R. van der Schalie, J. Wigneron, W. Wagner:
"Validation practices for satellite soil moisture retrievals: What are (the) errors?";
Remote Sensing of Environment, 244 (2020), 111806; 1 - 34.

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.

Remote sensing, Soil moisture, Validation, Error characterization, Error estimation, Good practice, Standardisation

http://dx.doi.org/10.1016/j.rse.2020.111806