By Topic

IEEE Transactions on Geoscience and Remote Sensing

Issue 5 • Sept. 1985

Filter Results

Displaying Results 1 - 25 of 27
  • IEEE Transactions on Geoscience and Remote Sensing

    Publication Year: 1985, Page(s): c1
    Request permission for commercial reuse | PDF file iconPDF (1203 KB)
    Freely Available from IEEE
  • IEEE Geoscience and Remote Sensing Society

    Publication Year: 1985, Page(s): c2
    Request permission for commercial reuse | PDF file iconPDF (701 KB)
    Freely Available from IEEE
  • Table of contents

    Publication Year: 1985, Page(s): 613
    Cited by:  Papers (1)
    Request permission for commercial reuse | PDF file iconPDF (123 KB)
    Freely Available from IEEE
  • About the cover

    Publication Year: 1985, Page(s): 614
    Request permission for commercial reuse | PDF file iconPDF (43 KB)
    Freely Available from IEEE
  • A Tribute to the Late King-Sun Fu

    Publication Year: 1985, Page(s): 615
    Request permission for commercial reuse | PDF file iconPDF (1080 KB)
    Freely Available from IEEE
  • Foreword

    Publication Year: 1985, Page(s):616 - 617
    Request permission for commercial reuse | PDF file iconPDF (1180 KB)
    Freely Available from IEEE
  • Influence of Aerosol Scattering on Atmospheric Blurring of Surface Features

    Publication Year: 1985, Page(s):618 - 624
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1856 KB)

    We investigate the influence of the shape of atmospheric scattering phase functions on blurring of surface detail in images acquired from space. The effects are characterized by computing atmospheric transfer functions and by solving the multidimensional equation of radiative transfer using a Fourier transform method. We predict that increased forward scattering enhances the detectability of atmos... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Relative Importance of Aerosol Scattering and Absorption in Remote Sensing

    Publication Year: 1985, Page(s):625 - 633
    Cited by:  Papers (131)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2604 KB)

    Previous attempts to explain the effect of aerosols on satellite measurements of surface properties for the visible and near-infrared spectrum have emphasized the amount of aerosols without consideration of their absorption properties. In order to estimate the importance of absorption, the radiances of the sunlight scattered from models of the Earth-atmosphere system are computed as functions of t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Cloud Shadow Effects on Remote Sensing

    Publication Year: 1985, Page(s):634 - 639
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1855 KB)

    On relatively clear days, the shadow cast by an isolated, optically dense cloud produces an effect which is similar in extent and magnitude to the adjacency effects associated with high-contrast ground albedo boundaries. We have used a Monte Carlo radiative transfer model to examine the intensity and its components, comparing the cloud shadow case with that for a Lambertian albedo boundary. Althou... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Two-Dimensional Leaf Orientation Distributions

    Publication Year: 1985, Page(s):640 - 647
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2213 KB)

    Combined inclination/azimuth leaf angle distributions are important for accurate models of vegetation canopy reflectance. It is shown that appropriate mathematical representations can be constructed from beta distributions under most circumstances. This is illustrated by analyzing observational data on soybean leaves and balsam fir needles. There are some problems when the data is imprecise and wh... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Remote Sensing of Angular Characteristics of Canopy Reflectances

    Publication Year: 1985, Page(s):648 - 658
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4005 KB)

    The influence of the atmosphere on the remotely sensed angular distribution of canopy reflectance is studied by radiative transfer calculations with both a coupled atmosphere-canopy model and a pure atmosphere model with the canopy replaced by an equivalent bidirectional reflectance distribution function (BRDF). The canopy model, although one-dimensional, is able to reproduce typical canopy featur... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Contrasts among Bidirectional Reflectance of Leaves, Canopies, and Soils

    Publication Year: 1985, Page(s):659 - 667
    Cited by:  Papers (56)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2691 KB)

    The apparent brightness of a natural surface depends on the characteristics and direction of incident radiation, surface radiative properties, and the direction from which the surface is viewed. The bidirectional reflectance distribution functions (BRDF) for soils, vegetation canopies, and individual leaves have common features that arise from an anisotropic diffuse scattered component as well as ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Monte Carlo Reflectance Model for Soil Surfaces with Three-Dimensional Structure

    Publication Year: 1985, Page(s):668 - 673
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2227 KB)

    A Monte Carlo soil reflectance model has been developed to study the effect of macroscopic surface irregularities larger than the wavelength of incident flux. The model treats incoherent multiple scattering from Lambertian facets distributed on a periodic surface. Resulting bidirectional reflectance distribution functions are non-Lambertian and compare well with experimental trends reported in the... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Evaluation of a Canopy Reflectance Model for LAI Estimation through Its Inversion

    Publication Year: 1985, Page(s):674 - 684
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5074 KB)

    A technique described earlier for estimating leaf area index (LAI) from bidirectional canopy reflectance (CR) data is applied and evaluated for three plant canopies-a naturally growing healthy soybean canopy and two orchardgrass canopies-one homogenous and the other spatially clumped or "tufted." This technique employs the inversion of a CR model which is chosen to be the SAIL model. The CR data w... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Microwave Inversion of Leaf Area and Inclination Angle Distributions from Backscattered Data

    Publication Year: 1985, Page(s):685 - 694
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1880 KB)

    The backscattering coefficient from a slab of thin randomly oriented dielectric discs over a flat lossy ground is used to reconstruct the inclination angle and area distributions of the discs. The discs are employed to model a leafy agricultural crop, such as soybeans, in the L-band microwave region of the spectrum. The distorted Born approximation, along with a thin disc approximation, is used to... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Modeling the Radiant Transfers of Sparse Vegetation Canopies

    Publication Year: 1985, Page(s):695 - 704
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2418 KB)

    The three-dimensional radiative transfer model of Kimes [2] was used to extend our understanding of the physical principles causing the scattering dynamics in sparse vegetation canopies ( ≤50-percent ground cover). The model was upgraded by including an aniotropic scattering algorithm for soil developed by Walthall et al. [7]. The model was validated using measured directional reflectance ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Geometric-Optical Modeling of a Conifer Forest Canopy

    Publication Year: 1985, Page(s):705 - 721
    Cited by:  Papers (253)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5969 KB)

    A geometric-optical forest canopy model that treats conifers as cones casting shadows on a contrasting background can explain the major portion of the variance in a remotely sensed image of a forest stand. The model is driven by interpixel variance generated from three sources: 1) the number of crowns in the pixel; 2) the size of individual crowns; and 3) overlapping of crowns and shadows. The mod... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Plant Canopy Specular Reflectance Model

    Publication Year: 1985, Page(s):722 - 730
    Cited by:  Papers (77)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2596 KB)

    A model is derived for the amount of light specularly reflected and polarized by a plant canopy. The model is based on the morphological and phenological characteristics of the canopy and upon the Fresnel equations of optics. The theory demonstrates that the specular reflectance of the plant canopy is a function of the angle of incidence and potentially contains information to help discriminate be... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Inclusion of Specular Reflectance in Vegetative Canopy Models

    Publication Year: 1985, Page(s):731 - 736
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1611 KB)

    A detailed comparison of the observed soybeans and corn canopy reflectance with that calculated from three vegetative canopy reflectance models have shown systematic angular deviations. A likely cause of these effects is noninclusion of leaf specular reflectance. In this paper a formulation to calculate the component of canopy specular reflectance as a function of incident solar and view zenith an... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Sources of Scattering from Vegetation Canopies at 10 GHz

    Publication Year: 1985, Page(s):737 - 745
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2080 KB)

    High-resolution backscatter measurements were made at X-band, with vertical polarization, and incidence angles of 30° and 50°, for winter wheat, soybeans, and corn during the summer of 1984. Plants were observed both under natural conditions and with partial-to-complete defoliation. The resolution volume of the measurement system is better than 20 × 20 × 11.25 cm3 within the entire range of me... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Microwave Attenuation Properties of Vegetation Canopies

    Publication Year: 1985, Page(s):746 - 753
    Cited by:  Papers (54)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2200 KB)

    A major impediment to the understanding and modeling of propagation through and backscattering and emission from vegetation canopies has been the lack of canopy attenuation data as a function of frequency, incidence angle, and polarization configuration. This paper presents the results of attenuation experiments conducted for canopies of winter wheat and soybeans in the late spring and early summe... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Strong Fluctuation Theory for Scattering, Attenuation, and Transmission of Microwaves through Snowfall

    Publication Year: 1985, Page(s):754 - 760
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1814 KB)

    The strong fluctuation theory is applied to the study of the atmospheric snowfall which is modeled as a layer of random discretescatterers edium. As functions of size distribution, fractional volume, and radius of scatterers, we illustrate the relationship between the reflectivity factor and precipitation rate, the attenuation of the centimeter and millimeter waves, and the line-of-sight transmiss... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Study of Backscattering and Emission from Closely Packed Inhomogeneous Media

    Publication Year: 1985, Page(s):761 - 767
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2011 KB)

    The effects of close spacing between small scattering spheres were examined by keeping the distance-dependent terms in the expressions for the transverse scattered fields. The phase matrix was then derived from these fields and was used in the radiative transfer formulation to model scattering and emission from a densely populated, inhomogeneous layer. Computed results were compared with those obt... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Comparison between Active and Passive Sensing of Soil Moisture from Vegetated Terrains

    Publication Year: 1985, Page(s):768 - 775
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1250 KB)

    A comparison between active and passive sensing of soil moisture over vegetated areas is studied via scattering models. In active sensing, three contributing terms to radar backscattering can be identified: 1a) the ground surface scatter term; 2a) the volume scatter term representing scattering from the vegetation layer; and 3a) the surfacevolume. scatter term accounting for scattering from both s... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • IEEE Geoscience and Remote Sensing Socity

    Publication Year: 1985, Page(s): 775-a
    Request permission for commercial reuse | PDF file iconPDF (163 KB)
    Freely Available from IEEE

Aims & Scope

 

IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING (TGRS) is a monthly publication that focuses on the theory, concepts, and techniques of science and engineering as applied to sensing the land, oceans, atmosphere, and space; and the processing, interpretation, and dissemination of this information.

 

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Antonio J. Plaza
University of Extremadura