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Variability in Leaf and Litter Optical Properties: Implications for BRDF Model

Summary: Variability in Leaf and Litter Optical
Properties: Implications for BRDF Model
Inversions Using AVHRR, MODIS, and MISR
Gregory P. Asner,* Carol A. Wessman,* David S. Schimel,
and Steve Archer
Canopy radiative transfer models simulate the bidirec- model inversions by decreasing the number of observa-
tions required to retrieve canopy structural and biophysi-tional reflectance distribution function (BRDF) of vegeta-
tion covers with differing leaf and soil spectral and can- cal information from multiangle remotely sensed data.
ŠElsevier Science Inc., 1998opy structural characteristics. Numerical inversion of these
models has provided estimates of vegetation structural
and biophysical characteristics from multiangle, remotely
sensed optical data. The number of angularly unique ob-
servations compared to BRDF model parameters largely The spectral and angular dependence of photons reflected
off a surface is governed by the bidirectional reflectancedetermines the accuracy of retrievals. To increase this ra-
tio, additional observations of a target must be acquired distribution function (BRDF). In the specific case of vege-
tation canopies, this reflectance distribution is anisotropicand the BRDF models and inversions must be simplified.
The former will occur when the EOS instruments become and primarily a function of leaf optical properties, can-
opy architecture, soil surface attributes, illumination con-available. Previous studies suggest that simplification of
BRDF model inversions may best be accomplished by ditions, and viewing geometry (Ross, 1981; Goel, 1988;


Source: Archer, Steven R. - Savanna/Woodland Ecology Lab., School of Natural Resources and the Environment, University of Arizona


Collections: Environmental Sciences and Ecology