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Multiple vs single scattering - Assessment of magnitudesAll orders of scattering are analyzed for two artifical canopies. The SHL canopy consists of Small Horizontal Leaves that are much smaller than the leaf-to-leaf spacing. The IHL canopy consists of Infinite Horizontal Layers, where each leaf is of infinite extent (a horizontal plane). Hemispheric leaf reflectances and transmittances independent of the direction of illumination lead to exact solutions for these models. Sunlight that penetrates to a given leaf area index level is much stronger in an SHL canopy than that in IHL; but the difference becomes muted when leaf transmittance is large. Multiple scattering enhances the hemispheric canopy reflectance more strongly in SHL than it does in IHL. The enhancement depends linearly on leaf transmittance in SHL and on the transmittance squared in IHL. Comparison with measured reflectances indicates that IHL model grossly underestimates multiple scattering in soybean canopies.
Document ID
19910050675
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Otterman, Joseph
(Tel Aviv University Israel)
Brakke, T. W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
April 20, 1991
Publication Information
Publication: Applied Optics
Volume: 30
ISSN: 0003-6935
Subject Category
Earth Resources And Remote Sensing
Accession Number
91A35298
Distribution Limits
Public
Copyright
Other

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