Michigan microwave canopy scattering model

Ulaby, F. T.; Sarabandi, Kamal; McDonald, K. C.; Whitt, M.W.; Dobson, M.C.

doi:10.1080/01431169008955090

Cited by 675 publications

(276 citation statements)

References 19 publications

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“…Backscatter from forest canopies is a complex phenomenon as it depends on the size, shape, and dielectric properties of the scattering elements in the vegetation canopy and the surface properties (Ulaby, Sarabandi, McDonad, Witt, & Dobson, 1990). For the ERS SAR (C-band, 23j incidence angle, VV polarization) backscatter from a forest canopy arises primarily by leaves, needles, twigs, and small branches which are characterized by their high number density (Le Toan, Picard, Martinez, Melon, & Davidson, 2002).…”

Section: Ers and Jers Sar In Forestry Applicationsmentioning

confidence: 99%

Large-scale mapping of boreal forest in SIBERIA using ERS tandem coherence and JERS backscatter data

Wagner

Luckman

Vietmeier

et al. 2003

Remote Sensing of Environment

127

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Siberia's boreal forests represent an economically and ecologically precious resource, a significant part of which is not monitored on a regular basis. Synthetic aperture radars (SARs), with their sensitivity to forest biomass, offer mapping capabilities that could provide valuable up-to-date information, for example about fire damage or logging activity. The European Commission SIBERIA project had the aim of mapping an area of approximately 1 million km 2 in Siberia using SAR data from two satellite sources: the tandem mission of the European Remote Sensing Satellites ERS-1/2 and the Japanese Earth Resource Satellite JERS-1. Mosaics of ERS tandem interferometric coherence and JERS backscattering coefficient show the wealth of information contained in these data but they also show large differences in radar response between neighbouring images. To create one homogeneous forest map, adaptive methods which are able to account for brightness changes due to environmental effects were required. In this paper an adaptive empirical model to determine growing stock volume classes using the ERS tandem coherence and the JERS backscatter data is described. For growing stock volume classes up to 80 m 3 /ha, accuracies of over 80% are achieved for over a hundred ERS frames at a spatial resolution of 50 m. D

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Section: Ers and Jers Sar In Forestry Applicationsmentioning

confidence: 99%

Large-scale mapping of boreal forest in SIBERIA using ERS tandem coherence and JERS backscatter data

Wagner

Luckman

Vietmeier

et al. 2003

Remote Sensing of Environment

127

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“…The electromagnetic scattering by canonical physical objects is important in many applications [1][2][3][4][5][6][7][8]. For the case of dielectric cylinder with finite length, an exact analytical solution is still elusive, and several approximation approaches have been proposed in the literature.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Validity Region of the Extended T-Matrix Method for Scattering From Dielectric Cylinders With Finite Length

Yan¹,

et al. 2009

PIER

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Abstract-The T-matrix approach is effective in analyzing electromagnetic scattering from finite scatterers. Yet for scatterers with extreme geometry, this approach may fail. One example is its inability to analyze scattering from dielectric cylinders with large aspect ratios. To deal with such difficulty, recently we proposed a method based on an extension of the T-matrix approach, where a long cylinder is hypothetically divided into a cluster of identical sub-cylinders, for each the T matrix can be numerically stably calculated. Special care was paid to fulfill the boundary conditions at the hypothetic surface of any two neighboring sub-cylinders. The resultant coupled equations are different from that of multi-scatterer theory. The model results were in good agreement with experiment data available in the literature. However, the validity region of the proposed method was not fully characterized. Now we have developed and validated a method of moment (MoM) code, and are in a position to carry on the task of characterizing the validity region. The proposed method is found to be applicable to dielectric cylinders of arbitrary length as long as the T matrix is attainable for the elementary sub-cylinder. The conditions for the T matrix to be numerically stably calculated in terms of the equivalent volumetric radius and relative dielectric constant are also empirically obtained.

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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%

“…medium, and the single scattering theory was applied to account for the scattering and propagation in the random medium [1]- [3]. For example, in [1], a forest stand is represented in terms of a two-layer random medium, including a crown layer composed of randomly oriented cylinders and disks representing branches and leaves and a trunk layer containing nearly vertical cylinders representing tree trunks below the crown layer.…”

Section: Introductionmentioning

confidence: 99%

“…For example, in [1], a forest stand is represented in terms of a two-layer random medium, including a crown layer composed of randomly oriented cylinders and disks representing branches and leaves and a trunk layer containing nearly vertical cylinders representing tree trunks below the crown layer. Although these models are capable of predicting the scattering behavior of vegetation qualitatively, they are incapable of predicting the scattering behavior quantitatively due to their simplifying assumptions.…”

Section: Introductionmentioning

confidence: 99%

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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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Michigan microwave canopy scattering model

Cited by 675 publications

References 19 publications

Large-scale mapping of boreal forest in SIBERIA using ERS tandem coherence and JERS backscatter data

Large-scale mapping of boreal forest in SIBERIA using ERS tandem coherence and JERS backscatter data

Characterization of the Validity Region of the Extended T-Matrix Method for Scattering From Dielectric Cylinders With Finite Length

Electromagnetic scattering from short branching vegetation

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