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Dynamics of directional reflectance factor distributions for vegetation canopiesDirectional reflectance factors that span the entire exitance hemisphere are collected on the ground for a variety of homogeneous vegetation canopies and bare soils. NOAA 6/7 AVHRR bands 1 (0.58-0.68 micron) and 2 (0.73-1.1 microns) are used. When possible, geometric measurements of leaf orientation distributions are taken simultaneously with each spectral measurement. Other supporting structural and optical measurements are made. These data sets are taken at various times of the day for each cover type. These unique sets, together with pertinent data in the literature, are used to investigate the dynamics of the directional reflectance factor distribution as a function of the geometric structure of the scene, solar zenith angle, and optical properties of the scene components (leaves and soil). For complete homogeneous vegetation canopies, the principal trend observed at all sun angles and spectral bands is a minimum reflectance near nadir and increasing reflectance with increasing off-nadir view angle for all azimuth directions.
Document ID
19830050244
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Kimes, D. S.
(NASA Goddard Space Flight Center Earth Resources Branch, Greenbelt, MD, United States)
Date Acquired
August 11, 2013
Publication Date
May 1, 1983
Publication Information
Publication: Applied Optics
Volume: 22
ISSN: 0003-6935
Subject Category
Earth Resources And Remote Sensing
Accession Number
83A31462
Distribution Limits
Public
Copyright
Other

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