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Bidirectional Reflectance Modeling of Non-homogeneous Plant CanopiesThe objective of this research is to develop a 3-dimensional radiative transfer model for predicting the bidirectional reflectance distribution function (BRDF) for heterogeneous vegetation canopies. The model (named BIGAR) considers the angular distribution of leaves, leaf area index, the location and size of individual subcanopies such as widely spaced rows or trees, spectral and directional properties of leaves, multiple scattering, solar position and sky condition, and characteristics of the soil. The model relates canopy biophysical attributes to down-looking radiation measurements for nadir and off-nadir viewing angles. Therefore, inversion of this model, which is difficult but practical should provide surface biophysical pattern; a fundamental goal of remote sensing. Such a model also will help to evaluate atmospheric limitations to satellite remote sensing by providing a good surface boundary condition for many different kinds of canopies. Furthermore, this model can relate estimates of nadir reflectance, which is approximated by most satellites, to hemispherical reflectance, which is necessary in the energy budget of vegetated surfaces.
Document ID
19860004327
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Norman, J. M.
(Nebraska Univ. Lincoln, NE, United States)
Date Acquired
August 12, 2013
Publication Date
September 1, 1985
Publication Information
Publication: NASA. Goddard Space Flight Center Fundamental Remote Sensing Sci. Res. Program
Subject Category
Earth Resources And Remote Sensing
Accession Number
86N13796
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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