Electromagnetic scattering from a layer of finite length, randomly oriented, dielectric, circular cylinders over a rough interface with application to vegetation

Karam, M.A.; Fung, A.K.

doi:10.1080/01431168808954918

Cited by 231 publications

(77 citation statements)

References 14 publications

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“…For cylinders (representing trunks and branches in forest) the "infinite length" approximation can be adopted. In this case, extinction and bistatic scattering formulas were made available in [Karam et al, 1988].…”

Section: The Snow-vegetation Modelmentioning

confidence: 99%

Effect of forests on the retrieval of snow parameters from backscatter measurements

Macelloni

Brogioni

Montomoli

et al. 2012

European Journal of Remote Sensing

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In preparation for the CoReH2O satellite mission, one of the three missions selected for scientific and technical feasibility studies within the Earth Explorer Programme of the ESA, experimental and theoretical studies have been under way in order to improve methods for the retrieval of snow physical properties from SAR data. The aim of this paper is to investigate the impact of vegetation in the retrieval of snow parameters from microwave backscattering measurements. ARTT model capable of simulating scattering from a snowcovered vegetated terrain was developed and implemented to study the sensitivity to snow and vegetation parameters. A procedure for correcting the vegetation effect in the SWE retrieval algorithm has been suggested.

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Section: The Snow-vegetation Modelmentioning

confidence: 99%

Effect of forests on the retrieval of snow parameters from backscatter measurements

Macelloni

Brogioni

Montomoli

et al. 2012

European Journal of Remote Sensing

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“…These are all reasonable assumptions, which were easily checked using historical data from our field work and are usually adopted by other authors for similar environmental conditions [2]. If these assumptions apply, it can be shown that the drag coefficient of a circular cylinder is on the range 0.8-1.5 [21,24]. Following [2], we will assume C d∞ = 1.…”

Section: Estimation Of the Junco Marsh Hydraulic Conductivitymentioning

confidence: 99%

“…Junco plants are described as dielectric cylinders. The "infinite length" approximation [21] is used to compute the bistatic scattering cross section and the extinction cross section. Radius, height and orientation distributions are given on the basis of available ground truth.…”

Section: The Interaction Modelmentioning

confidence: 99%

Estimating Flow Resistance of Wetlands Using SAR Images and Interaction Models

et al. 2009

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Abstract:The inability to monitor wetland drag coefficients at a regional scale is rooted in the difficulty to determine vegetation structure from remote sensing data. Based on the fact that the backscattering coefficient is sensitive to marsh vegetation structure, this paper presents a methodology to estimate the drag coefficient from a combination of SAR images, interaction models and ancillary data. We use as test case a severe fire event occurred in the Paraná River Delta (Argentina) at the beginning of 2008, when 10% of the herbaceous vegetation was burned up. A map of the reduction of the wetland drag coefficient is presented.

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“…1. Suppose a plane wave given by (1) is illuminating the ground plane from the upper half-space, where is the unit vector along the propagation direction given by (2) The vector in (1) is expressed in terms of a local coordinate system ( , , ) where and denote the horizontal and vertical unit vectors, respectively. Representing the direction of the observation point by , the polarization of the scattered field can also be expressed in terms of a local coordinated system ( , , ) where (3) and and can be obtained using similar expressions as those given for and , respectively.…”

Section: Theoretical Analysismentioning

confidence: 99%

Electromagnetic scattering from short branching vegetation

Chiu

Sarabandi

2000

IEEE Trans. Geosci. Remote Sensing

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Abstract-A polarimetric coherent electromagnetic scattering model for short branching vegetation is developed in this paper. With the realistic structures that reasonably describe the relative positions of the particles, this model is able to consider the coherent effect due to the phase difference between the scattered fields from different particles, and account for the second-order, near-field interaction between particles, to which the relative positions and orientation of the particles are essential. The model validation with measurements is also presented, and excellent agreement is obtained. The polarimetric radar backscatter measurements for soybean plants using truck-mounted scatterometers were conducted at L-band and C-band under different soil-moisture conditions. Through an extensive ground truth, the important plant and rough surface parameters such as the soil moisture and surface roughness, vegetation dielectric constant, and geometry of the soybean plants, were characterized for model verification. It is found that the second-order near-field scattering is significant at C-band for fully grown soybeans due to the high vegetation particle density, and at L-band, the contribution from the second-order near field is negligible. The coherence effect is shown to be important at L-band and to a much lesser extent at C-band. This model is then used to demonstrate its ability for estimating the physical parameters of a soybean field, including soil moisture from a polarimetric set of AIRSAR images.

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Electromagnetic scattering from a layer of finite length, randomly oriented, dielectric, circular cylinders over a rough interface with application to vegetation

Cited by 231 publications

References 14 publications

Effect of forests on the retrieval of snow parameters from backscatter measurements

Effect of forests on the retrieval of snow parameters from backscatter measurements

Estimating Flow Resistance of Wetlands Using SAR Images and Interaction Models

Electromagnetic scattering from short branching vegetation

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