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Microwave backscattering and emission model for grass canopiesA two-layer model is developed that treats the grass canopy as a collection of randomly oriented elliptical dielectric discs over a layer of thatch with underlying soil surface. The distorted Born approximation in conjunction with the Peake formulation is used to calculate the backscattering coefficient and the emissivity from the canopy. Two particular features of this model which are unique for grass canopies are the variation of the canopy structure and the presence of the thatch layer. The basic parameters in the model such as the size and orientation of grass blades, dielectric constant of soil and vegetation, and thickness and water content of the thatch layer have been obtained from ground truth data. To interpret the available experimental observations of grasslands, numerical results from both passive and active models at L-band (1.4 GHz) are generated and various scattering and emission properties of the grass canopies are discussed.
Document ID
19920052607
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Saatchi, Sasan S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Lang, Roger H.
(George Washington University Washington, DC, United States)
Levine, David M.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Earth Resources And Remote Sensing
Meeting Information
Meeting: IGARSS ''91: Annual International Geoscience and Remote Sensing Symposium
Location: Espoo
Country: Finland
Start Date: June 3, 1991
End Date: June 6, 1991
Accession Number
92A35231
Distribution Limits
Public
Copyright
Other

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