Summary

Microwave dielectric models (MDM) of the moist soils are an essential part in the algorithms used for data processing with regard to the problems of radar and radiothermal remote sensing. At present, the J. Wang and T. Schmugge [1] and M.G. Dobson et.al. [2], [3] MDMs are the most popular and vide used models for predicting permittivities of moist soils in the microwave band. The Schmugge MDM is valid only for two frequencies, that is, 1.4 GHz and 5 GHz, the temperatures 22-24°C, and the soils with clay content from 0 to 62%. The Dobson model is a spectroscopic model which is applicable in the range of frequencies from 0.3 GHz to 18 GHz and temperatures 22±2°C, respectively, in the case of soils, contenting up to 47% of clay. Recently, a physically based dielectric model in microwave band for moist soils is developed by Mironov et. al. [4]-[5]. The Mironov model is a spectroscopic one to provide for the complex dielectric constants of moist soils as a function of moisture, up to fielled capacity, frequencies in the range from 0.3 GHz to 26.5 GHz , temperatures varying from 10 to 40°C and clay content in soils, up to 76%.

The comparative analysis of the soil moisture retrieving errors from the microwave radiobrightnesses observations caused by imperfectness of the three models proved the errors relating to the Schmugge and Mironov models to be on the same order of ±0.02 cm3/cm3 to ±0.04 cm3/cm3. At the same time, the error regarding the Dobson model appeared to be up to 0.16 cm3/cm3 [6]. All the three model mentioned above are based on the dielectric data measured for the soils containing less than 5-7% of organic matter.

The site provides for predictions of the complex dielectric constant of moist soils as a function of moisture, wave frequency, temperature and gravimetric clay content. It is based on the Mironov spectroscopic dielectric model.

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