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Geoscience and Remote Sensing, IEEE Transactions on

Issue 6 • Date Nov. 1995

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Displaying Results 1 - 12 of 12
  • Corrections to "Dielectric Properties of Soils in the 0.3-1.3-GHz Range"

    Publication Year: 1995
    Cited by:  Papers (21)
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  • Corrections to "Measuring Soil Moisture with Imaging Radars"

    Publication Year: 1995
    Cited by:  Papers (7)
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  • Corrections to "Inferring Snow Wetness Using C-Band Data from SIR-C's Polarimetric Synthetic Apertur

    Publication Year: 1995
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  • Detecting “dipole ring” separatrices with zebra palettes

    Publication Year: 1995 , Page(s): 1306 - 1312
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1252 KB)  

    Two new analysis methods applicable to remote sensing of the sea surface are described. The first is a zebra false-color palette that combines a slowly varying rainbow with a rapid gray-scale sinusoid, and the other is a routine that tracks the thermal separatrix, or dividing line, between two (of more) circulation regimes. Used together, a significant increase in data retention is achieved compared to traditional algorithms based on frontal digitizations. These two methods are applied to historical infrared data of Gulf Stream rings from the western North Atlantic. The ring data indicate anticyclonic rings usually have at least one cyclonic companion and are more appropriately modeled as dipoles. Several examples of cyclonic rings in the Sargasso Sea are seen with anticyclonic companions and are also believed to be dipoles. The separatrix method is shown to provide reliable rotation rates for these vortex systems View full abstract»

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  • Infrared extinction of the powder of brass 70Cu/30Zn calculated by the FDTD and turning bands methods [military smoke screening applications]

    Publication Year: 1995 , Page(s): 1321 - 1324
    Cited by:  Papers (2)
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    The finite-difference time-domain (FDTD) method is used to calculate the specific extinction cross section of the powder of brass 70Cu/30Zn with 103 to 2.16-105 cubical particles for cell sizes in the range of 0.025 to 0.5 μm at infrared frequency. The digitized models with a random process using the turning bands method are simulated for the powder of brass 70Cu/30Zn. From theoretical calculations, the value of the specific extinction cross section of the powder of brass 70Cu/30Zn is between 0.1 to 4.6 m2/g. While from the experimental measurement, the value of the specific extinction cross section is between 0.58 to 3.78 m2/g. Most of the theoretical results make a good agreement with those obtained from the experimental measurements for the cell sizes of particles in the range of 0.925 to 0.5 μm. From the numerical calculations, it is also found that there is a resonant extinction value occuring at the resonant particle size d0 which is approximately 2.54-np -0.293 μm determined by a least square curve fitting method, where np is the number of particles. The resonant value calculated by the numerical solution is larger than the maximum value obtained from the experimental measurement. The work has applications to military smoke screening View full abstract»

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  • Development of an active radar calibrator for the TRMM precipitation radar

    Publication Year: 1995 , Page(s): 1316 - 1318
    Cited by:  Papers (7)
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    An active radar calibrator (ARC) was developed for the calibration of the first spaceborne Precipitation Radar (PR) onboard the Tropical Rainfall Measuring Mission (TRMM) satellite. The ARC has three functions of the radar receiver, beacon-signal transmitter, and delayed-transponder. A ground-based measurement using a prototype ARC and a bread-board model of the TRMM-PR demonstrated the ARC's capability for the on-orbit TRMM-PR calibration View full abstract»

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  • Passive microwave relative humidity retrievals using feedforward neural networks

    Publication Year: 1995 , Page(s): 1324 - 1328
    Cited by:  Papers (2)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (564 KB)  

    A technique for retrieving atmospheric humidity profiles using passive microwave spectral observations from satellite and multilayer feedforward neural networks (MFNN) is introduced. Relative humidity retrievals on a global scale from simulated radiances at fifteen frequencies between 23.8 and 183.3 GHz yielded rms errors in relative humidity of 6-14% over ocean and 6-15% over land at pressure levels ranging from 131 mbar to 1013 mbar. Comparison with a combined statistical and physical iterative retrieval scheme shows that superior retrievals can be obtained at a lower computational cost using MFNN View full abstract»

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  • An extension of the Jeffreys-Matusita distance to multiclass cases for feature selection

    Publication Year: 1995 , Page(s): 1318 - 1321
    Cited by:  Papers (31)
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    The problem of extending the Jeffreys-Matusita distance to multiclass cases for feature-selection purposes is addressed and a solution equivalent to the Bhattacharyya bound is presented. This extension is compared with the widely used weighted average Jeffreys-Matusita distance both by examining the respective formulae and by experimenting on an optical remote-sensing data set View full abstract»

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  • Representing backscatter fluctuations with a PDF convolution equation and its application to study backscatter variability in side-scan sonar images

    Publication Year: 1995 , Page(s): 1328 - 1331
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    Image histograms are useful for revealing the relative proportions of geological components in a scene, but these proportions are commonly obscured by the variability caused by signal fading (image speckle). This variability can potentially be reduced by deconvolution because a scene's PDF is related to the Rayleigh log-PDF and PDF of backscatter strengths via a convolution integral. A simple deconvolution algorithm is demonstrated by separating a submarine lava flow from its adjacent sediments in a side-scan sonar image histogram View full abstract»

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  • Sensitivity of metal detectors to spheroidal targets

    Publication Year: 1995 , Page(s): 1331 - 1335
    Cited by:  Papers (4)
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    The sensitivity of magnetic metal detectors to prolate or oblate spheroidal targets depends both on the semiaxis ratio and on the orientation of the spheroid polar axis relative to the local magnetic field. A spherical target produces null response only if the generator and detector coil magnetic fields are orthogonal, but the spheroid possesses a null direction for a large range of magnetic field orientations. A spheroid can therefore be made undetectable by rotating it into a particular orientation. The existence of such blind-position angles is investigated theoretically in detail and families of curves are given to illustrate them in a particular case View full abstract»

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  • Comparison of scene segmentations: SMAP, ECHO, and maximum likelihood

    Publication Year: 1995 , Page(s): 1313 - 1316
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (648 KB)  

    Sequential maximum a posteriori (SMAP) and the extraction and classification of homogeneous objects (ECHO), two spectral/spatial scene segmentation algorithms, were compared with traditional maximum likelihood (ML) estimation in a supervised classification of multispectral data. SMAP generalized better than both ECHO and ML. Significant differences were found in all mean class classification accuracies: SMAP>ECHO>ML View full abstract»

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  • A vertically-pointing Doppler radar to measure precipitation characteristics in the tropics

    Publication Year: 1995 , Page(s): 1336 - 1340
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (556 KB)  

    Describes the design and preliminary results from a vertically-pointing pulsed S-band Doppler radar, capable of measuring reflectivity (dBZ), linear depolarization ratio (LDR), and the Doppler spectrum. The data reported were acquired during a short experimental campaign while the radar was sited in Southern UK. The system has now been sent to Papua New Guinea for a 12 month programme of statistical measurements on the nature of tropical rainfall. The results from this study will be applicable to communications system engineering in the tropics, and in providing ground truth for satellite-based rainfall measurements for global climatic modeling View full abstract»

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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.

 

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Meet Our Editors

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