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Estimation of soil microwave effective temperature at L and C bands

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3 Author(s)
Chanzy, A. ; Unite de Sci. du Sol, INRA, Avignon, France ; Raju, S. ; Wigneron, J.-P.

The soil microwave effective temperature (Te) is an important parameter which improves the accuracy of the soil surface moisture derived from low frequency microwave radiometric observations. A new semi-empirical model of Te at L- and C-bands is proposed. The model is based on the following inputs: the air temperature (Ta), a deep soil temperature (Td), and the microwave brightness temperature measured at X-band (λ≃3 cm) and V polarization (TBXV). Unlike other approaches based on the surface temperature (Ts), the proposed model can be implemented without being dependent on the clear sky conditions required to measure Ts with a spaceborne infrared radiometer. However, the proposed model may also use Ts when available. The model was designed from a large data set simulated by a physical model for smooth bare soil. The model of Te was then successfully validated with experimental data acquired during a ground based experiment with the multifrequency PORTOS radiometer. This model designed from smooth soil data was successfully tested on rough bare soil using experimental data

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Geoscience and Remote Sensing, IEEE Transactions on  (Volume:35 ,  Issue: 3 )