Microwave Emission and Scattering from Vegetation Canopies

The paper summarizes results of original researches on microwave remote sensing of vegetation conducted at the Institute of Radioengineering and Electronics of the AS, USSR during the last years. Vegetation models as continuous and discrete media are analyzed. The discrete approach appears to be more adequate for the description of microwave propagation in vegetation. Microwave scattering and absorption by plant elements of different shapes and sizes are studied. It allows one to obtain the relation between electrodynamic and biometric parameters of vegetation canopies. It is shown that microwave attenuation for given wavelength and vegetation type is defined by the canopy water content per unit area, the relative volume density of vegetation and the moisture of plant elements. The radiation model of vegetation canopy is proposed as a closed system of equations for the emissivity and the backscattering coefficient. Experiments measuring attenuation and emission properties of vegetation were perfomed under...

[1]  Fawwaz T. Ulaby,et al.  Microwave Dielectric Properties of Plant Materials , 1984, IEEE Transactions on Geoscience and Remote Sensing.

[2]  Jack F. Paris,et al.  Radar Backscattering Properties of Corn And Soybeans at Frequencies of 1.6, 4.75, And 13.3 GHz , 1983, IEEE Transactions on Geoscience and Remote Sensing.

[3]  W. Peake.  Interaction of electromagnetic waves with some natural surfaces , 1959 .

[4]  D. Polder,et al.  The effective permeability of mixtures of solids , 1946 .

[5]  Roger H. Lang,et al.  Electromagnetic backscattering from a sparse distribution of lossy dielectric scatterers , 1981 .

[6]  Effects of Varying Soil Moisture Contents And Vegetation Canopies on Microwave Emissions , 1982, IEEE Transactions on Geoscience and Remote Sensing.

[7]  A. A. Chukhlantsev,et al.  Microwave Radiation Peculiarities of Vegetative Covers , 1982, IEEE Transactions on Geoscience and Remote Sensing.

[8]  A. A. Chukhlantsev,et al.  Experimental study of vegetable canopy microwave emission , 1989 .

[9]  Fawwaz Ulaby,et al.  A Scatter Model for Leafy Vegetation , 1978, IEEE Transactions on Geoscience Electronics.

[10]  P. Pampaloni,et al.  Comparison Between Microwave Emissivity And Backscattering Coefficient Of Agricultural Fields , 1988, International Geoscience and Remote Sensing Symposium, 'Remote Sensing: Moving Toward the 21st Century'..

[11]  Leung Tsang,et al.  Application of Strong Fluctuation Random Medium Theory to Scattering from Vegetation-Like Half Space , 1981, IEEE Transactions on Geoscience and Remote Sensing.

[12]  Leung Tsang,et al.  A Simple Relation between Active And Passive Microwave Remote Sensing Measurements of Earth Terrain , 1982, IEEE Transactions on Geoscience and Remote Sensing.

[13]  Roger H. Lang,et al.  Scattering from thin dielectric disks , 1984 .

[14]  S. Paloscia,et al.  Microwave Emission and Plant Water Content: A Comparison between Field Measurements and Theory , 1986, IEEE Transactions on Geoscience and Remote Sensing.

[15]  Ahad Tavakoli,et al.  Microwave Propagation Constant for a Vegetation Canopy With Vertical Stalks , 1987, IEEE Transactions on Geoscience and Remote Sensing.

[16]  A. Fung,et al.  Scattering from a Vegetation Layer , 1979, IEEE Transactions on Geoscience Electronics.

[17]  F. Ulaby,et al.  Microwave radar response to canopy moisture, leaf-area index, and dry weight of wheat, corn, and sorghum☆ , 1981 .

[18]  Fawwaz Ulaby,et al.  Microwave Dielectric Spectrum of Vegetation-Part I: Experimental Observations , 1987, IEEE Transactions on Geoscience and Remote Sensing.

[19]  M. A. Karam,et al.  Electromagnetic scattering from a layer of finite length, randomly oriented, dielectric, circular cylinders over a rough interface with application to vegetation , 1988 .

[20]  A. K. Fung,et al.  A scatter model for vegetation up to Ku-band , 1984 .

[21]  Fawwaz Ulaby,et al.  Preliminaly Evaluation of the SIR-B Response to Soil Moisture, Surface Roughness, and Crop Canopy Cover , 1986, IEEE Transactions on Geoscience and Remote Sensing.

[22]  V. V. Tamoikin.  The average field in a medium having strong anisotropic inhomogeneities , 1971 .

[23]  H. Tan,et al.  A Radiative Transfer Backscatter Model for a Vegetative Layer of a Mixture of Discrete Scatterers , 1990 .

[24]  F. Ulaby.  Radar response to vegetation , 1975 .

[25]  Fawwaz T. Ulaby,et al.  Using Mimics To Model L-band Multiangle and Multitemporal Backscatter From A Walnut Orchard , 1990 .

[26]  J. Paris,et al.  The effect of leaf size on the microwave backscattering by corn , 1986 .

[27]  N. Chauhan,et al.  Polarization utilization in the microwave inversion of leaf angle distributions , 1989 .

[28]  A. Lopes,et al.  Microwave propagation at X band in cylindrical-shaped forest components: attenuation observations , 1990 .

[29]  Thomas J. Jackson,et al.  Attenuation of soil microwave emission by corn and soybeans at 1.4 and 5 GHz , 1990 .

[30]  M. A. Karam,et al.  Scattering from randomly oriented circular discs with application to vegetation , 1983 .

[31]  J. A. Kong,et al.  Application of strong fluctuation random medium theory to scattering of electromagnetic waves from a half-space of dielectric mixture , 1982 .

[32]  Roger H. Lang,et al.  Electromagnetic Backscattering from a Layer of Vegetation: A Discrete Approach , 1983, IEEE Transactions on Geoscience and Remote Sensing.

[33]  Fawwaz Ulaby,et al.  Microwave Attenuation Properties of Vegetation Canopies , 1985, IEEE Transactions on Geoscience and Remote Sensing.

[34]  F. Ulaby,et al.  Vegetation modeled as a water cloud , 1978 .

[35]  M.C. Dobson,et al.  Seasonal change in radar backscatter from mixed conifer and hardwood frorests in northern Michigan , 1991, [Proceedings] IGARSS'91 Remote Sensing: Global Monitoring for Earth Management.

[36]  Fawwaz Ulaby,et al.  Microwave Emission from Row Crops , 1986, IEEE Transactions on Geoscience and Remote Sensing.

[37]  F. Ulaby,et al.  Microwave Backscatter Dependence on Surface Roughness, Soil Moisture, and Soil Texture: Part II-Vegetation-Covered Soil , 1979, IEEE Transactions on Geoscience Electronics.

[38]  Fawwaz Ulaby,et al.  Microwave Dielectric Spectrum of Vegetation - Part II: Dual-Dispersion Model , 1987, IEEE Transactions on Geoscience and Remote Sensing.

[39]  Fawwaz T. Ulaby,et al.  Improvement of Moisture Estimation Accuracy of Vegetation-Covered Soil by Combined Active/Passive Microwave Remote Sensing , 1983, IEEE Transactions on Geoscience and Remote Sensing.

[40]  M.A. Karam,et al.  Leaf-shape effects in electromagnetic wave scattering from vegetation , 1989, IEEE Transactions on Geoscience and Remote Sensing.

[41]  H. Eom.  Regression models for vegetation radar-backscattering and radiometric emission , 1986 .

[42]  Akira Ishimaru,et al.  Dense medium radiative transfer theory: comparison with experiment and application to microwave remote sensing and polarimetry , 1989 .

[43]  A. Fung,et al.  Application of First-Order Renormalization Method to Scattering from a Vegetation-Like Half-Space , 1977, IEEE Transactions on Geoscience Electronics.

[44]  Robert E. McIntosh,et al.  Polarimetric backscatter measurements of deciduous and coniferous trees at 225 GHz , 1991, IEEE Trans. Geosci. Remote. Sens..

[45]  Christian Mätzler,et al.  Seasonal evolution of microwave radiation from an oat field. , 1990 .

[46]  Thomas J. Jackson,et al.  Calculations of radar backscattering coefficient of vegetation-covered soils , 1984 .

[47]  T. Mo,et al.  The Effects of Soil Moisture, Surface Roughness, and Vegetation on L-Band Emission and Backscatter , 1987, IEEE Transactions on Geoscience and Remote Sensing.

[48]  Simonetta Paloscia,et al.  Microwave polarization index for monitoring vegetation growth , 1988 .

[49]  Kamal Sarabandi,et al.  Michigan microwave canopy scattering model , 1990 .

[50]  Yu. A. Ryzhov,et al.  Radiation and propagation of electromagnetic waves in randomly inhomogeneous media (review) , 1970 .

[51]  Kamal Sarabandi,et al.  Measuring and modeling the backscattering cross section of a leaf , 1987 .

[52]  H. V. Hulst.  Light Scattering by Small Particles , 1957 .

[53]  A. Fung,et al.  An empirical model for polarized and cross-polarized scattering from a vegetation layer , 1988 .

[54]  T. Mo,et al.  A model for microwave emission from vegetation‐covered fields , 1982 .