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Published in: Earth Science Informatics 2/2023

17-03-2023 | RESEARCH

Comparative assessment of surface soil moisture simulations by the coupled wcm-iem vs. data-driven models using the Sentinel 1 and 2 satellite images

Authors: Neda Dolatabadi, Mohsen Nasseri, Banafsheh Zahraie

Published in: Earth Science Informatics | Issue 2/2023

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Abstract

Radar satellite imagery has been widely used to obtain soil moisture (SM) estimates of high accuracy. However, obtaining the best accuracy of SM estimates requires investigating the contribution of vegetation canopy to the accuracy of retrieved SM. We used the Integral Equation Model (IEM) coupled with the Water Cloud Model (WCM) (herein referred to as the IWCM) to estimate surface SM using radar and multi-spectral images. Accordingly, Sentinel-1 and Sentinel-2 images corresponding to calibration (2017) and validation (2016) periods were used to obtain VV-polarized radar data (where radar transmits and receives vertical polarization), Leaf Area Index, and Normalized Difference Vegetation Index at the SM measurement stations. SM measurements from eleven stations in the Walnut Gulch watershed, USA, were used as in situ data. Investigating the relationship between the simulation error on various variables revealed a dependence of error on precipitation received on the day before soil moisture measurement was carried out. Next, two data-driven models (DDMs), i.e., Support Vector Machine (SVM) and the Regression Tree (RT), were used to obtain SM estimates at stations using radar signal and vegetation indices as their input features. Accordingly, the RT model showed the best performance with validation error of 0.071 m3/m3 and 0.074 m3/m3 for the LAI and NDVI-based models, respectively. Based on the RT results, precipitation of the previous day, followed by the Julian date had the highest values of importance in predicting the the soil moisture. The RT model was consequently used to calculate regionalized estimates for the watershed due to its higher accuracy in estimating SM in the measurement stations. The results indicated the feasibility of using DDMs to obtain regionalized surface SM measurements at the watershed scale.

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Appendix
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Metadata
Title
Comparative assessment of surface soil moisture simulations by the coupled wcm-iem vs. data-driven models using the Sentinel 1 and 2 satellite images
Authors
Neda Dolatabadi
Mohsen Nasseri
Banafsheh Zahraie
Publication date
17-03-2023
Publisher
Springer Berlin Heidelberg
Published in
Earth Science Informatics / Issue 2/2023
Print ISSN: 1865-0473
Electronic ISSN: 1865-0481
DOI
https://doi.org/10.1007/s12145-023-00987-9

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