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THE INTERACTION OF ELECTROMAGNETIC WAVES WITH SOME NATURAL SURFACES,
OHIO STATE UNIV COLUMBUS
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It has been shown that the bi-static or dif ferential scattering coefficients gamma sub hh, etc., may be used to determine a number of prop erties of the interaction of electromagnetic radiation with natural surfaces, in particular the back-scattering radar cross-section the albedo, and the absorption coefficient. By making use of the reciprocity relations satisfied by the scattering coefficients, it is then possible to derive Kirchhoffs radiation law in a form which accounts for the angular dependence and polariza tion dependence of the emission and absorption coefficients, and predicts them in terms of the gammas. Thus it has been shown that once the gammas are known, both the scattering and the radiometric properties of the surface may be found in terms of them. In applying the general results to actual terrain surfaces, two models have been suggested for two commonly encountered types of surface, for which the scattering co efficients have been calculated in detail. Author
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