Variation of dielectric constant for a tree trunk and improvement of biomass retrieval accuracy estimated from satellite-borne SAR

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Uncertainty of biomass estimation from satellite-borne synthetic aperture radar data(backscattering coefficient) was examined. Time series of both backscattering coefficient and dielectric constant of a three trunk, which is directly related to the backscattering coefficient, show a variation, which is weakly correlated with precipitation. We conclude that this effect should be taken into account to derive more accurate forest biomass estimation.