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  • Artikel  (2.657)
  • 1
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    IEEE Geoscience and Remote Sensing Letters Institutional Listings (2018)
    Institute of Electrical and Electronics Engineers (IEEE)
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    Publikationsdatum: 2018-03-28
    Beschreibung: Advertisements.
    Print ISSN: 1545-598X
    Digitale ISSN: 1558-0571
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie , Geologie und Paläontologie
    Publiziert von Institute of Electrical and Electronics Engineers (IEEE)
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
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    PolSAR Image Classification Using Polarimetric-Feature-Driven Deep Convolutional Neural Network (2018)
    Institute of Electrical and Electronics Engineers (IEEE)
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    Publikationsdatum: 2018-03-28
    Beschreibung: Polarimetric synthetic aperture radar (PolSAR) image classification is an important application. Advanced deep learning techniques represented by deep convolutional neural network (CNN) have been utilized to enhance the classification performance. One current challenge is how to adapt deep CNN classifier for PolSAR classification with limited training samples, while keeping good generalization performance. This letter attempts to contribute to this problem. The core idea is to incorporate expert knowledge of target scattering mechanism interpretation and polarimetric feature mining to assist deep CNN classifier training and improve the final classification performance. A polarimetric-feature-driven deep CNN classification scheme is established. Both classical roll-invariant polarimetric features and hidden polarimetric features in the rotation domain are used to drive the proposed deep CNN model. Comparison studies validate the efficiency and superiority of the proposal. For the benchmark AIRSAR data, the proposed method achieves the state-of-the-art classification accuracy. Meanwhile, the convergence speed from the proposed polarimetric-feature-driven CNN approach is about 2.3 times faster than the normal CNN method. For multitemporal UAVSAR data sets, the proposed scheme achieves comparably high classification accuracy as the normal CNN method for train-used temporal data, while for train-not-used data it obtains an average of 4.86% higher overall accuracy than the normal CNN method. Furthermore, the proposed strategy can also produce very promising classification accuracy even with very limited training samples.
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    Digitale ISSN: 1558-0571
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie , Geologie und Paläontologie
    Publiziert von Institute of Electrical and Electronics Engineers (IEEE)
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  • 3
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    [Front cover] (2018)
    Institute of Electrical and Electronics Engineers (IEEE)
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    Publikationsdatum: 2018-03-28
    Beschreibung: Presents the cover/table of contents for this issue of the periodical.
    Print ISSN: 1545-598X
    Digitale ISSN: 1558-0571
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie , Geologie und Paläontologie
    Publiziert von Institute of Electrical and Electronics Engineers (IEEE)
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  • 4
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    Table of contents (2018)
    Institute of Electrical and Electronics Engineers (IEEE)
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    Publikationsdatum: 2018-03-28
    Print ISSN: 1545-598X
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    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie , Geologie und Paläontologie
    Publiziert von Institute of Electrical and Electronics Engineers (IEEE)
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  • 5
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    Unusual Premonsoon Eddy and Kelvin Wave Activities in the Bay of Bengal During Indian Summer Monsoon Deficit in June 2009 and 2012 (2018)
    Institute of Electrical and Electronics Engineers (IEEE)
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    Publikationsdatum: 2018-03-28
    Beschreibung: An investigation of the eddy and coastal Kelvin wave activities in the Bay of Bengal (BoB) is carried out during premonsoon season in two years of Indian summer monsoon deficit in June (2009 and 2012), occurred in the recent warming hiatus period. Using altimeter observations, our study reveals that over the northern BoB cyclonic eddy kinetic energy is reduced by 35% and 50% from the climatology during premonsoon seasons in 2009 and 2012, respectively, while the cyclonic eddy area is reduced by 18% and 24%, respectively. A concurrent reduction is observed in the first upwelling Kelvin wave (uKW) activities in the eastern equatorial Indian Ocean as well as in the coastal BoB for these years. The reduction in the generation of the first uKW in the eastern equatorial Indian Ocean is attributed to the westerly wind anomalies in January–March of these years. Additionally, meridional wind stress anomalies during March–April in these years are found to be southerly, causing anomalous coastal downwelling in the eastern rim of BoB. This coastal downwelling blocks the propagation of the first uKW. The decrease in the first uKW activities in the coastal waveguide of the BoB reduces the radiation of upwelling Rossby waves, thereby decreasing the cyclonic eddy activities in the northern BoB. The results from this letter could be helpful for further understanding of upper ocean mixing processes in the BoB during monsoon deficit years.
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    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie , Geologie und Paläontologie
    Publiziert von Institute of Electrical and Electronics Engineers (IEEE)
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  • 6
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    Seasonal Impact of Adjacency Effects on Ocean Color Radiometry at the AAOT Validation Site (2018)
    Institute of Electrical and Electronics Engineers (IEEE)
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    Publikationsdatum: 2018-03-28
    Beschreibung: The seasonal impact of adjacency effects (AE) on satellite ocean color data at visible and near-infrared (NIR) wavelengths by the Sea-Viewing Wide Field-of-View Sensor, the Moderate Resolution Imaging Spectroradiometer onboard the Aqua platform (MODISA), the Medium Resolution Imaging Spectrometer, the Ocean and Land Color Instrument, the Operational Land Imager (OLI), and the MultiSpectral Imagery (MSI) was theoretically evaluated at a validation site in the northern Adriatic Sea. The analysis made use of comprehensive simulations accounting for multiple scattering, sea surface roughness, sensor viewing geometry, actual coastline, typical and extreme atmospheric conditions, and the seasonal variability of solar illumination and, land and water optical properties. Results, obtained by relying on the normalization of the radiometric sensitivity of each sensor to the same input radiance, show that the spectral and seasonal impacts of AE considerably vary among sensors. AE significantly exceed the radiometric sensitivity of MSI at its sole blue band in winter, whereas they significantly outdo the noise threshold of OLI and MODISA high-resolution data exclusively in the NIR in summer. Conversely, for all other sensors and for MODISA low-resolution data, AE are particularly significant at NIR bands between March and October and at the blue–green bands in winter.
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    Digitale ISSN: 1558-0571
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie , Geologie und Paläontologie
    Publiziert von Institute of Electrical and Electronics Engineers (IEEE)
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  • 7
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    IEEE Geoscience and Remote Sensing Letters publication information (2018)
    Institute of Electrical and Electronics Engineers (IEEE)
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    Publikationsdatum: 2018-03-28
    Beschreibung: Provides a listing of current staff, committee members and society officers.
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    Digitale ISSN: 1558-0571
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie , Geologie und Paläontologie
    Publiziert von Institute of Electrical and Electronics Engineers (IEEE)
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  • 8
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    A Bi-Iterative Model for Electromagnetic Scattering From a PEC Object Partially Buried in Rough Sea Surface (2018)
    Institute of Electrical and Electronics Engineers (IEEE)
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    Publikationsdatum: 2018-03-28
    Beschreibung: A bi-iterative physical optics (PO) method is presented in this letter to investigate the composite scattering from a perfectly electric conducting object partially buried in the dielectric rough sea surface. In the present method, both the scatterings of a partially buried object and the underlying sea surface are calculated by the PO method. And a bi-iterative strategy is considered, including the mutual interaction among points on the object in direct scattering and the mutual interaction between the object and the sea surface in coupling scattering. In addition, the coupling interaction between the partially buried object and the sea surface contains two parts: 1) the upper surface of the sea surface and the upper part of the object and 2) the lower surface of sea surface and the lower part of the object. In numerical simulations, the bistatic normalized radar cross sections of the composite model are computed by the bi-iterative PO method and are compared with those by the conventional method of moments for different object types and polarizations. The results show that the proposed method has a good accuracy and can greatly reduce the computational time and memory requirement.
    Print ISSN: 1545-598X
    Digitale ISSN: 1558-0571
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie , Geologie und Paläontologie
    Publiziert von Institute of Electrical and Electronics Engineers (IEEE)
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  • 9
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    Frequency Domain Inverse Profiling of Buried Dielectric Elliptical-Cylindrical Objects Using Evolutionary Programming (2018)
    Institute of Electrical and Electronics Engineers (IEEE)
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    Publikationsdatum: 2018-03-28
    Beschreibung: An efficient method based on the evolutionary programming (EP) technique is proposed for inverse profiling of 2-D buried dielectric objects with elliptical cross sections. In particular, EP with Cauchy mutation operator (EP-CMO), as its first reported implementation to inverse problems, is utilized as a stochastic optimization tool for quantitatively reconstructing buried objects. Moreover, the method of moments technique in conjunction with conjugate gradient-fast Fourier transform method is used, as a fast and simple frequency domain forward solver, in each iteration of the proposed method. Numerical results for different case studies are presented and analyzed. To assess the proposed EP-CMO method, the results are also compared statistically with that of three other well-known optimization techniques, namely, EP with Gaussian mutation, particle swarm optimization, and genetic algorithms. The results reveal that EP-CMO is a significantly more robust and efficient optimization tool in reconstruction of this class of buried objects.
    Print ISSN: 1545-598X
    Digitale ISSN: 1558-0571
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie , Geologie und Paläontologie
    Publiziert von Institute of Electrical and Electronics Engineers (IEEE)
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  • 10
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    Correction of Forcing-Related Spatial Artifacts in a Land Surface Model by Satellite Soil Moisture Data Assimilation (2018)
    Institute of Electrical and Electronics Engineers (IEEE)
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    Publikationsdatum: 2018-03-28
    Beschreibung: Retrieved soil moisture estimates from the National Aeronautics and Space Administration (NASA) Soil Moisture Active Passive (SMAP) radiometer are assimilated into the Noah land surface model (LSM) within the NASA Land Information System. The experimental testbed is based on a real-time LSM system produced by the NASA Short-Term Prediction Research and Transition Center. A nonlocalized cumulative distribution function-matching bias correction (BC) is applied to the SMAP retrievals, with separate correction curves calculated based on soil texture categories. We show that the assimilation of SMAP soil moisture retrievals with nonlocalized BC can mitigate two types of artifacts due to spatially varying errors in the forcing data from: 1) bad point (rain gauge) data and 2) strong gradients along the eastern U.S.–Canada border, resulting from blending different observing systems.
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    Thema: Architektur, Bauingenieurwesen, Vermessung , Geographie , Geologie und Paläontologie
    Publiziert von Institute of Electrical and Electronics Engineers (IEEE)
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