Abstract
A scatterometer ranging experiment is described in which C-band data and boresight photography were collected using a helicopter so as to provide a capability to study scattering processes in forest canopies in the Superior National Forest in Minnesota. An inversion scheme is used to determine C-band volume extinction and scattering coefficients for high density aspen sites. Analysis of data thru the season indicates that VV, HH, and VH volume extinction coefficients change during the year and are presumably affected by the emergence and senescence of leaves. A linear relationship was observed between σ° (VV) and leaf area index for low and medium density aspen sites, but a large decrease occurred in σ° for both high density sites. Calculations using the Fung disk model, which accounts only for the leaves, shows an underestimate of σ° by a factor of 2 or 3 indicating that scattering by branches and soil background may be important at C-band.
Published Version
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