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A mathematical characterization of vegetation effect on microwave remote sensing from the EarthIn passive microwave remote sensing of the earth, a theoretical model that utilizes the radiative transfer equations was developed to account for the volume scattering effects of the vegetation canopy. Vegetation canopies such as alfalfa, sorghum, and corn are simulated by a layer of ellipsoidal scatterers and cylindrical structures. The ellipsoidal scatterers represent the leaves of vegetation and are randomly positioned and oriented. The orientation of ellipsoids is characterized by a probability density function of Eulerian angles of rotation. The cylindrical structures represent the stalks of vegetation and their radii are assumed to be much smaller than their lengths. The underlying soil is represented by a half-space medium with a homogeneous permittivity and uniform temperature profile. The radiative transfer quations are solved by a numerical method using a Gaussian quadrature formula to compute both the vertical and horizontal polarized brightness temperature as a function of observation angle. The theory was applied to the interpretation of experimental data obtained from sorghum covered fields near College Station, Texas.
Document ID
19830026135
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Choe, Y. (Texas A&M Univ. College Station, TX, United States)
Tsang, L. (Texas A&M Univ. College Station, TX, United States)
Date Acquired
September 4, 2013
Publication Date
August 1, 1983
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
NAS 1.26:173051
E83-10415
RSC-139
SM-T3-04436
NASA-CR-173051
Accession Number
83N34406
Funding Number(s)
CONTRACT_GRANT: NAG5-31
PROJECT: PROJ. AGRISTARS
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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