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clarifications on the "comparison between smos, vua, ascat, and ecmwf soil moisture products over four watersheds in u.s."In a recent paper, Leroux et al. compared three satellite soil moisture data sets (SMOS, AMSR-E, and ASCAT) and ECMWF forecast soil moisture data to in situ measurements over four watersheds located in the United States. Their conclusions stated that SMOS soil moisture retrievals represent "an improvement [in RMSE] by a factor of 2-3 compared with the other products" and that the ASCAT soil moisture data are "very noisy and unstable." In this clarification, the analysis of Leroux et al. is repeated using a newer version of the ASCAT data and additional metrics are provided. It is shown that the ASCAT retrievals are skillful, although they show some unexpected behavior during summer for two of the watersheds. It is also noted that the improvement of SMOS by a factor of 2-3 mentioned by Leroux et al. is driven by differences in bias and only applies relative to AMSR-E and the ECWMF data in the now obsolete version investigated by Leroux et al.
Document ID
Document Type
Reprint (Version printed in journal)
Wagner, Wolfgang
(Technische Univ. Wien, Australia)
Luca, Brocca
(Consiglio Nazionale delle Ricerche Bari, Italy)
Naeimi, Vahid
(Technische Univ. Wien, Australia)
Reichle, Rolf
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Draper, Clara
(Universities Space Research Association Greenbelt, MD, United States)
de Jeu, Richard
(VU Univ. Amsterdam, Netherlands)
Ryu, Dongryeol
(Melbourne Univ. Victoria, Australia)
Su, Chun-Hsu
(Melbourne Univ. Victoria, Australia)
Western, Andrew
(Melbourne Univ. Victoria, Australia)
Calvet, Jean-Christophe
(Centre National de Recherches Meteorologiques Toulouse, France)
Kerr, Yann H.
(Centre d'Etudes Spatiales de la Biosphere Toulouse, France)
Leroux, Delphine J.
(Centre d'Etudes Spatiales de la Biosphere Toulouse, France)
Drusch, Matthias
(European Space Agency. European Space Research and Technology Center, ESTEC Noordwijk, Netherlands)
Jackson, Thomas J.
(Agricultural Research Service Hydrology and Remote Sensing Lab. Beltsville, MD, United States)
Hahn, Sebastian
(Technische Univ. Wien, Australia)
Dorigo, Wouter
(Technische Univ. Wien, Australia)
Paulik, Christoph
(Technische Univ. Wien, Australia)
Date Acquired
January 12, 2015
Publication Date
October 22, 2013
Publication Information
Publication: IEEE Transactions on Geoscience and Remote Sensing
Volume: 52
Issue: 3
Subject Category
Statistics and Probability
Earth Resources and Remote Sensing
Report/Patent Number
Funding Number(s)
Distribution Limits
Public Use Permitted.
Data Assimilation

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