Release of the new SMOS-IC version 2 (V2) of SM and L-VOD products

Since the release of the first version of SMOS-IC V105, several improvements have been applied to the SMOS-IC algorithm, leading to the production of the version 2 (V2), based on a collaboration between INRAE and China Scholarship Council. Major improvements were based on the concept that VOD has low time variations over short time periods (Wigneron et al., 2000; Tian et al., 2018). To implement this multi-orbit concept, the optimization processing of the a priori information on VOD to constrain the retrievals has been modified in SMOS-IC V2: to retrieve VOD at a date t, previously retrieved VOD values (over a period of 10 days before date t) are used to initialize the first guess value of VOD (VODini) in the cost function. A more detailed description of the SMOS-IC V2 retrieval algorithm will be given in Wigneron et al., 2020(RSE, Submitted). It should be noted that clear improvements in SMOS-IC V2 are obtained for both SM and VOD. An in-depth analysis and inter-comparison between L-VOD products and other frequency VOD is ongoing (Li et al., 2020 (RSE, submitted)).


  • Wigneron, J.P., Li, X., Frappart, F., Fan, L., Al-Yaari, A., De Lannoy, G., Liu, X., Wang, M., Le Masson, E., & Moisy, M. (Submitted). Overview of the SMOS-IC data record of soil moisture and L-VOD: historic development, applications and perspectives. Remote Sensing of Environment.
  • Li, X., Wigneron, J.P., Frappart, F., Fan, L., Philippe, C. et al (Submitted). Global-scale assessment and inter-comparison of recently developed/reprocessed microwave satellite vegetation optical depth products. Remote Sensing of Environment.
  • Li X, Al-Yaari A, Schwank M, et al. Compared performances of SMOS-IC soil moisture and vegetation optical depth retrievals based on Tau-Omega and Two-Stream microwave emission models[J]. Remote Sensing of Environment, 2020, 236: 111502.
  • Li, X., Wigneron, J.-P., Frappart, F., Fan, L., Wang, M., Liu, X., Al-Yaari, A., Moisy, C., 2020. Development and validation of the SMOS-IC version 2 soil moisture product. In: IGARSS 2020-2020 IEEE International Geoscience and Remote Sensing Symposium. IEEE.


2 Responses

  1. Junzhi Liu says:

    Thank you very much for your nice work! I wonder where I can find the SMOS-IC L-VOD data? I found that only the SM data are available in the ftp.
    Thank you in advance!

    • cmoisy says:

      Thank you for your interest! Yes only the SM data are publicly available for now. The L-VOD data up to 2017 are available (papers based on the full 2010-2020 data set are are still in review) . Please contact me directly by e-mail and I’ll give to you the procedure to download the 2010-2017 L-VOD data set.

      We prefer not to distribute publicly the L-VOD data set as precautions should be taken in some regions because of RFI (a global filtered data set is being produced).

      Thank you !

      JP Wigneron

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