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Multiple incidence angle SIR-B data of the Cordon la Grasa region of the Chubut Province of Argentina are used to discriminate nate various forest types by their relative brightness versus incidence angle signatures. The region consists of several species of Nothofagas which change in canopy structure with elevation, slope, and exposure. In general, the factors that appear to impact the radar response most are canopy structure, density, and ground cover (presence or absence of dead trunks and branches in particular). The results of this work indicate that 1) different forest species, and structures of a singlee-species, may be discriminated using multiple incidence angle radar-imagery and 2) it is essential to consider the variation in backscatter due to incidence angle when analyzing and comparing data collected at varying frequencies and polarizations.
Cimino et al. (1986) studied this question.