EGU21-12826
https://doi.org/10.5194/egusphere-egu21-12826
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Estimating the best spatial resolution of remotely sensed surface soil moisture based on their uncertainty 

Theresa C. van Hateren1,2, Marco Chini1, Patrick Matgen1, Luca Pulvirenti3, Nazzareno Pierdicca4, and Adriaan J. Teuling2
Theresa C. van Hateren et al.
  • 1Luxembourg Institute of Science and Technology, Esch-sur-Alzette, Luxembourg (tessa.vanhateren@list.lu)
  • 2Wageningen University & Research, Wageningen, The Netherlands
  • 3CIMA Research Foundation, Savona, Italy
  • 4Sapienza University of Rome, Rome, Italy

Validation of remotely sensed soil moisture is a well-known issue. Reference data with the correct spatial and temporal resolution on large scales are sparse and lack spatial representativeness. Moreover, due to the heterogeneity of soil moisture in both space and time, even reference data cannot be considered to be “ground truth”. As such, uncertainties are difficult to quantify. Additionally, in remotely sensed soil moisture there are trade-offs between spatial resolution and temporal resolution, resolution and accuracy, and resolution and computing time. Here, we try to identify the best spatial resolution for Sentinel-1 based soil moisture estimation, considering the trade-off between product resolution and accuracy. We use the uncertainty  of the soil moisture estimate as a guide parameter, and focus on how product accuracy depends on factors as soil wetness, and characteristics of the vegetated canopy.  To this end, we compare Sentinel-1 soil moisture estimates to both in situ data and global reference data sets with a lower spatial resolution. Remotely sensed surface soil moisture data were obtained by applying the MULESME algorithm  (Pulvirenti et al., 2018) on Sentinel-1 data throughout 2020. An extensive field campaign was performed, where TDR data and volumetric soil samples were gathered. A nearby setup of permanent soil moisture probes additionally provided continuous measurements of soil moisture at different depths, from 10 to 60 centimetres. Global datasets were obtained from the SMOS satellite constellation, GLDAS, MERRA-2 and ESA CCI.

Pulvirenti, L., Squicciarino, G., Cenci, L., Boni, G., Pierdicca, N., Chini, M., Versace, P. & Campanella, P. (2018). A surface soil moisture mapping service at national (Italian) scale based on Sentinel-1 data. Environmental Modelling & Software, 102, 13-28.

How to cite: van Hateren, T. C., Chini, M., Matgen, P., Pulvirenti, L., Pierdicca, N., and Teuling, A. J.: Estimating the best spatial resolution of remotely sensed surface soil moisture based on their uncertainty , EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-12826, https://doi.org/10.5194/egusphere-egu21-12826, 2021.

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