Journal ArticleDOI
Scattering from a layer of discrete random medium over a random interface: application to microwave backscattering from forests
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In this article, the distorted Born approximation is used to calculate the bistatic scattering coefficients from a layer of sparsely distributed discrete dielectric scatterers over a random interface.Abstract:
The distorted Born approximation is used to calculate the bistatic scattering coefficients from a layer of sparsely distributed discrete dielectric scatterers over a random interface. After specializing to the backscatter case, the scattering coefficient is determined as a sum of direct, direct reflected and interface scatter contributions. The direct reflected term contains contributions from the average interface and the interface fluctuations. These direct reflected terms include both incoherent and coherent or enhancement terms. The results are applied to backscattering from a mature hemlock forest over a roughened ground. The model results show that the direct reflected surface fluctuation terms give the dominant contribution to backscatter at P band and are equal in magnitude to the volume scatter at L band. Use of these new results brings the model predictions and experimental results into agreement.read more
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Journal ArticleDOI
Estimation of Forest Fuel Load From Radar Remote Sensing
TL;DR: Semiempirical algorithms were developed to estimate crown and stem biomass and three major fuel load parameters, namely: 1) canopy fuel weight; 2) canopy bulk density; and 3) foliage moisture content, and these estimates provided more than 70% accuracy and, when partitioned into fuel load classes, provide more than 85% accuracy.
Journal ArticleDOI
A forest geometric description of a maritime pine forest suitable for discrete microwave models
TL;DR: A forest geometric description (FGD) of a Maritime pine tree forest suitable for discrete models at low microwave frequencies is presented and an original approach to describe the tree architecture is presented.
Journal ArticleDOI
Enhanced Simulation of Radar Backscatter From Forests Using LiDAR and Optical Data
TL;DR: In this article, LiDAR and optical remote sensing data are integrated with tree- and stand-level information to parameterize a coherent L-band synthetic aperture radar (SAR) imaging simulation that models microwave penetration and interaction with the canopy, understory and ground.
Journal ArticleDOI
A Physical-Optics Model for Double-Bounce Scattering From Tree Stems Standing on an Undulating Ground Surface
TL;DR: The results indicate that ground topography must be considered when predicting the variations in backscatter in the SAR images studied, and the model did, however, fail to predict the absolute values of the backscattered intensity.
Journal ArticleDOI
NUFFT- & GPU-Based Fast Imaging of Vegetation
TL;DR: An effective algorithm, based on the filtered backprojection (FBP) approach, for the imaging of vegetation, with significant speed-ups are obtained by a parallel versions of the NUFFT algorithm, purposely designed to be run on Graphic Processing Units (GPUs) by using the CUDA language.
References
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Journal ArticleDOI
Microwave Dielectric Behavior of Wet Soil-Part II: Dielectric Mixing Models
TL;DR: In this paper, the authors evaluated the microwave dielectric behavior of soil-water mixtures as a function of water content and soil textural composition for the 1.4-to 18-GHz region.
Journal ArticleDOI
The Multiple Scattering of Waves. I. General Theory of Isotropic Scattering by Randomly Distributed Scatterers
TL;DR: In this article, the problem of multiple scattering of scalar waves by a random distribution of isotropic scatterers is considered in detail on the basis of a consistent wave treatment.
Book
Microwave Scattering and Emission Models and their Applications
TL;DR: First-order radiative transfer solution passive sensing formulation of the surface scattering problem surface model and special cases ranges validity of the IEM model matrix doubling formulations for scattering and emission scattering and emissions models for snow and sea ice comparisons of model predictions with backscattering and emission measurements from snow and ice.
Reference EntryDOI
Microwave Remote Sensing
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Journal ArticleDOI
Multiple scattering of waves
Peter C. Waterman,Rohn Truell +1 more
TL;DR: In this article, a criterion for the validity of approximate integral equations describing the various field quantities of interest was obtained by employing a ''configurational averaging'' procedure, and the extinction theorem was obtained and given rise to the forward-amplitude theorem of multiple scattering.
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