Estimating Soil Moisture from Fusion of Soil Physical/Hydraulic Properties and Optical Remote Sensing Observations Using Machine Learning

Document Type : Research Paper

Authors

1 Department of Soil Science and Engineering, Faculty of Agriculture, Shahid Chamran University of Ahvaz, Ahvaz, Iran.

2 Associate Professor, Department of soil science, Faculty of Agriculture , Shahid Chamran University of Ahvaz, Iran

3 Department of Environmental Science, University of Arizona,, Arizona, USA

Abstract

Soil moisture content (SM) is a critical state variable that significantly affects both the hydrological cycle and agricultural production. Therefore, accurate estimation of soil moisture is important for agricultural water resources management. Remote sensing observations in the near- and shortwave infrared have large potential for estimating soil moisture. In addition, soil physical and hydraulic properties affect spatial and temporal variability of soil moisture. The objective of this research was to derive different models for soil moisture estimation in Amir Kabir sugarcane agro-industry fields, Kuzestan province using a combination of soil physical/hydraulic properties and remote sensing observations with machine learning algorithms. Consequently, 166 ground control points and 16 Sentinel-2 satellite images were investigated during the growth period of sugarcane in the year 2021. Six machine learning algorithms including decision tree (DT), support vector machine (SVM), Linear regression, Boosted and Bagged trees, and nural network were used for modeling. Seven models were derived from the combination of soil physical/hydrological properties and remote sensing indices in a hierarchical manner to predict soil moisture content at the field scale. The results indicated that the combination of soil physical/hydraulic properties with remote sensing indices enhances the accuracy of soil moisture estimation. It is observed that almost all developed models performed well for estimating soil moisture, with an RMSE of 0.04-0.06 cm-3cm-3 and an R2 of approximately 0.80. The STR parameter was found to be more sensitive to changes in soil water content than NIR reflectance. Therefore, STR was identified as the most important feature in estimating soil moisture content. Moreover, stepwise linear regression with RMSE value of 0.042 cm3 cm-3 performed the best in soil moisture estimation. According to the results, the models successfully capture the spatiotemporal dynamics of soil moisture and can be used for irrigation scheduling and precision irrigation management at the field scale.

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