Modeling Surface Soil Moisture from Microwave Remote Sensing Data
Published on by Kalpana Bhagat, Propritor at GATHA COGNITION in Academic
Active microwave remote sensing has offered prominent potential towards accurate estimation of surface soil moisture.
The spatiotemporal variation of surface soil moisture is a key subject variable need to be assessed accurately since it plays a crucial role in partitioning of rainfall into runoff and infiltration. Active microwave remote sensing has offered prominent potential towards accurate estimation of surface soil moisture.
Present study utilizes ERS-2 SAR image for estimating surface soil moisture by incorporating the effect of topography, vegetation and surface roughness over three land cover types namely; sugarcane, wheat and barren land through Multiple Linear Regression (MLR) approach.
Five independent variables considered for MLR analysis include backscatter coefficient (σ0σ0 ), local incidence angle (αiαi), surface roughness height (hshs), Leaf Area Index (LAI) and Plant Water Content (PWC), respectively.
Results indicate retrieval of soil moisture within ± 20% accuracy for all the three land cover types with higher accuracy for barren land (i.e. R2 ~ 0.78 and RMSE = 1.31) as compared to the other two land cover types (i.e. sugarcane; R2 ~ 0.67 and RMSE = 3.60 and wheat; R2 ~ 0.72 and RMSE = 1.94). The present study reveals the effectiveness of MLR approach in the retrieval of surface soil moisture using fewer numbers of variables.
Attached link
http://www.gathacognition.com/article/gca9Media
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