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Modeling of soil organic matter using Sentinel-1 SAR and partial least squares (PLS) regression

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Abstract

The determination of soil properties, in addition to requiring great human effort, also involves a number of technical activities of high financial cost. Seeking to show that it is possible to reduce these high financial costs, this study presents a methodology that combines remote sensing techniques and mathematical modeling for estimating the concentration of soil organic matter (SOM). Technological advances have provided great improvements in equipment for capturing terrestrial information, allowing a greater availability of quality data for spatial analysis, which has brought about better estimates in the models. Thus, this study evaluated the capacity of the Sentinel-1 Synthetic Aperture Radar (SAR) satellite to determine the concentration of SOM in areas with different types of agricultural use in a hydrographic basin localted in the souutheastern region of the state of São Paulo, Brazil. The partial least squares regression method was used to build models for estimating the SOM, taking into account the SAR backscattering values and soil samples obtained in situ, which were collected at a depth of 0–10 cm. The results obtained indicated that the accuracy of the model adjusted based on backscattering values in the vertical/vertical (VV), vertical/horizontal (VH) polarizations, product of VHxVV and soil moisture presented a coefficient of determination of 0.502 with the SOM for independent data, at p <0.0001. These results indicate that the model derived from the SAR data for the map** of SOM presented potential for prediction, but only within acceptable limits for predicting SOM in areas with similar characteristics of land use.

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Acknowledgements

This study was supported by the Coordination for the Improvement of Higher Education Personnel – Brazil (CAPES) – Code Financing 001.

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Conceptualization: Miqueias Lima Duarte; Data modeling, validation and visualization: Miqueias Lima Duarte and Ricardo Luís Barbosa; Writing–original draft: Miqueias Lima Duarte and Ricardo Luís Barbosa; Supervision: Roberto Wagner Lourenço; writing–review and editing: Darllan Collins da Cunha e Silva and Roberto Wagner Lourenço.

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Correspondence to Miqueias Lima Duarte.

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The authors declare no competing interests.

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Responsible Editor: Biswajeet Pradhan

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Duarte, M.L., da Cunha e Silva, D.C., Barbosa, R.L. et al. Modeling of soil organic matter using Sentinel-1 SAR and partial least squares (PLS) regression. Arab J Geosci 17, 32 (2024). https://doi.org/10.1007/s12517-023-11844-w

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  • DOI: https://doi.org/10.1007/s12517-023-11844-w

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