Study on the relationship between polarimetric parameters and vegetation biomass and its use in wetland vegetation biomass inversion

Poyang Lake is the largest freshwater lake in China and one of the most important wetlands in the world. Vegetation, an important component of wetland ecosystems, is one of the main sources of the carbon in the atmosphere. The backscatter coefficients (HH, HV and VV), the Pope biophysical indices, the polarimetric parameters from Freeman-Durden decomposition, Cloude-Pottier decomposition, TSVM decomposition were derived from RADARSAT-2 PolSAR data and used to analysis the relationship between them and the wetland vegetation biomass. After the polarization parameters optimization, we find that these 6 parameters, σ0HV, VSI, PV, PD, PS and Anisotropy (A) can be used to retrieve the Poyang Lake Wetland vegetation biomass. The R2 and RMSE of the wetland vegetation biomass inversion for the combination of SVM and backscatter coefficients are 0.49, 118.3g/m2; that for the combination of SVM and polarimetric parameters are 0.71, 76.1g/m2.

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