A method to estimate crop effects at higher frequencies by modeling and microwave radiometric data

To use the 0th-order τ-ω model to retrieve soil moisture from radiometric data at frequencies higher than the C band, the characteristics of the effective single scattering albedo ω and the opacity rof vegetation must be studied. In this paper, the co and r values of corn for the C, X, and Ku bands...

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Published inScience China. Earth sciences Vol. 55; no. 7; pp. 1159 - 1165
Main Authors Zhang, ZhongJun, Zhang, LiXin, Sun, GuoQing, Liu, QinHuo
Format Journal Article
LanguageEnglish
Published Heidelberg SP Science China Press 01.07.2012
Springer Nature B.V
Subjects
Agricultural production
Albedo
Aluminum
Corn
Earth and Environmental Science
Earth Sciences
Emissions
Emissivity
Growing season
Mathematical models
Moisture content
Opacity
Radiometry
Research Paper
Soil moisture
Soil sciences
Transmissivity
Vegetables
Vegetation
估算
作物效应
单次散射反照率
土壤水分
建模
微波
辐射数据
频率
vegetation
microwave emission
matrix-doubling
single scattering albedo
transmissivity
Online AccessGet full text
ISSN1674-7313
1869-1897
DOI10.1007/s11430-012-4410-7

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Summary:To use the 0th-order τ-ω model to retrieve soil moisture from radiometric data at frequencies higher than the C band, the characteristics of the effective single scattering albedo ω and the opacity rof vegetation must be studied. In this paper, the co and r values of corn for the C, X, and Ku bands were retrieved by matching the simulations of a high-order matrix-doubling model to the τ-ω model. First, the brightness temperature of the matrix-doubling was validated by a truck-mounted radiometer in a field experiment, where the vegetation emission contributions were validated with aluminum foil to mask the soil emission. Then an emissivity database of corn fields for different growing seasons was established for a variety of soil conditions. With the transmissivity of corn determined from the database, the effective single scattering albedos of corn for different heights at the C, X, and Ku bands and at a 55° viewing angle were derived. To verify the accuracy of the derived co and τ values, we used SMEX02/PSR aircraft data and the Qp model to retrieve the soil moisture; the RMSE between the retrieval and the measurements was 4.76% at the C band and 5.36% at the X band.
Bibliography:11-5843/P
To use the 0th-order τ-ω model to retrieve soil moisture from radiometric data at frequencies higher than the C band, the characteristics of the effective single scattering albedo ω and the opacity rof vegetation must be studied. In this paper, the co and r values of corn for the C, X, and Ku bands were retrieved by matching the simulations of a high-order matrix-doubling model to the τ-ω model. First, the brightness temperature of the matrix-doubling was validated by a truck-mounted radiometer in a field experiment, where the vegetation emission contributions were validated with aluminum foil to mask the soil emission. Then an emissivity database of corn fields for different growing seasons was established for a variety of soil conditions. With the transmissivity of corn determined from the database, the effective single scattering albedos of corn for different heights at the C, X, and Ku bands and at a 55° viewing angle were derived. To verify the accuracy of the derived co and τ values, we used SMEX02/PSR aircraft data and the Qp model to retrieve the soil moisture; the RMSE between the retrieval and the measurements was 4.76% at the C band and 5.36% at the X band.
microwave emission, single scattering albedo, transmissivity, vegetation, matrix-doubling
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ISSN:1674-7313
1869-1897
DOI:10.1007/s11430-012-4410-7