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A key concern of current scientific research is to understand temporal climatic variations that are closely related to the carbon cycle. Forested areas are carbon sinks and the desire to estimate forest biomass content is the focus of advanced PolInSAR techniques proposed in this paper. Through use of Polarization Coherence Tomography (PCT) derived from a single-pass, dual-baseline L-Band PolInSAR airborne system, profiles or tomograms can be generated to better estimate the forest structure function and lead to improvements in relating the vertical distribution of scattering power to biomass. We present here early results of this approach.