NDLI: Calculations of microwave brightness temperature of rough soil surfaces: bare field

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Calculations of microwave brightness temperature of rough soil surfaces: bare field

Content Provider	NASA Technical Reports Server (NTRS)
Author	Wang, J. R. Mo, T. Schmugge, T. J.
Copyright Year	1985
Description	A model for simulating the brightness temperatures of soils with rough surfaces is developed. The surface emissivity of the soil media is obtained by the integration of the bistatic scattering coefficients for rough surfaces. The roughness of a soil surface is characterized by two parameters, the surface height standard deviation sigma and its horizontal correlation length l. The model calculations are compared to the measured angular variations of the polarized brightness temperatures at both 1.4 GHz and 5 GHz frequences. A nonlinear least-squares fitting method is used to obtain the values of delta and l that best characterize the surface roughness. The effect of shadowing is incorporated by introducing a function S(theta), which represents the probability that a point on a rough surface is not shadowed by other parts of the surface. The model results for the horizontal polarization are in excellent agreement with the data. However, for the vertical polarization, some discrepancies exist between the calculations and data, particularly at the 1.4 GHz frequency. Possible causes of the discrepancy are discussed.
File Size	26137413
Page Count	88
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19850014910
Archival Resource Key	ark:/13960/t6wx28f6m
Language	English
Publisher Date	1985-03-01
Access Restriction	Open
Subject Keyword	Earth Resources And Remote Sensing Soils Correlation Least Squares Method Moisture Mathematical Models Brightness Temperature Surface Roughness Remote Sensing Microwaves Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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