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  • Artikel  (37)
  • 2010-2014  (37)
  • 2011  (37)
  • Architektur, Bauingenieurwesen, Vermessung  (37)
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  • Artikel  (37)
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  • 2010-2014  (37)
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  • 1
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    IEEE Geoscience and Remote Sensing Letters information for authors (2011)
    Institute of Electrical and Electronics Engineers (IEEE)
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    Publikationsdatum: 2011-12-23
    Beschreibung: Provides instructions and guidelines to prospective authors who wish to submit manuscripts.
    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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  • 2
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    IEEE Geoscience and Remote Sensing Letters publication information (2011)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publikationsdatum: 2011-12-23
    Beschreibung: Provides a listing of current society officers.
    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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  • 3
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    IEEE Geoscience and Remote Sensing Letters institutional listings (2011)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publikationsdatum: 2011-12-23
    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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    Explore IEL IEEE's most comprehensive resource (2011)
    Institute of Electrical and Electronics Engineers (IEEE)
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    Publikationsdatum: 2011-12-23
    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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  • 5
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    Interferometric Circular SAR Method for Three-Dimensional Imaging (2011)
    Institute of Electrical and Electronics Engineers (IEEE)
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    Publikationsdatum: 2011-11-01
    Beschreibung: The aperture of 360° gives circular synthetic aperture radar (SAR) (CSAR) the capability to detect hidden target when its orientation is unknown. Subwavelength resolution can also be achieved when the target in the spotted area is observed under a complete circular aperture. Furthermore, the aspect angle diversity inherent to the circular trajectory makes possible a 3-D target reconstruction. However, the latter two potentials require certain target reflectivity homogeneity. For a highly directive scatterer, it has no resolving ability in the direction normal to the data collection plane. In this letter, a new interferometric CSAR method is presented to enhance the tomographic imaging capability for highly directive scatterers without sacrificing other scatterers' resolutions. This method takes advantage of the coherence and the phase difference between a pair of 3-D SAR images formed from data collected at two separate circular apertures to eliminate targets that focused at a wrong elevation. In addition, it uses two different transmit frequencies to solve the problem of phase cycle ambiguities. Finally, simulation results validate this new approach.
    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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  • 6
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    Sliding Spotlight and TOPS SAR Data Processing Without Subaperture (2011)
    Institute of Electrical and Electronics Engineers (IEEE)
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    Publikationsdatum: 2011-11-01
    Beschreibung: During the data acquisition of a sliding spotlight or terrain observation by progressive scan (TOPS) synthetic aperture radar (SAR), the steering of the antenna main beam increases the azimuth bandwidth but could result in the azimuth signal aliasing in the Doppler domain. To remove the aliasing, one has used a subaperture method. In this letter, we show a focusing scheme without the use of the subaperture for both sliding spotlight and TOPS SARs. In doing so, we eliminated the obvious increase in data volume or the subaperture division by choosing the pulse repetition frequency that is only 20% greater than the instantaneous bandwidth. The method was incorporated with an available imaging algorithm and then used to process simulated and collected data of the sliding spotlight and TOPS SARs. Well-focused results without aliasing were obtained.
    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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  • 7
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    Bayesian Hyperanalytic Denoising of SONAR Images (2011)
    Institute of Electrical and Electronics Engineers (IEEE)
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    Publikationsdatum: 2011-11-01
    Beschreibung: The SOund Navigation And Ranging (SONAR) images are perturbed by speckle noise. This paper presents a new denoising method in the wavelet domain, which tends to reduce the speckle, preserving the structural features and the textural information of the scene. Shift invariance associated with good directional selectivity is important for the use of a wavelet transform (WT) in denoising of SONAR images. In this paper, we propose the use of a variant of hyperanalytic WT, which is quasi-shift invariant and has good directional selectivity in association with a maximum a posteriori filter named bishrink. This filter makes a very good treatment of the contours. The corresponding denoising algorithm is simple and fast. Its performance was proved on images perturbed by synthesized speckle noise and on real SONAR images.
    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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  • 8
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    A Novel Strategy of Nonnegative-Matrix-Factorization-Based Polarimetric Ship Detection (2011)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publikationsdatum: 2011-11-01
    Beschreibung: In this letter, a new strategy based on nonnegative matrix factorization (NMF) is proposed for polarimetric ship detection. This method utilizes the sparse feature of nonnegative eigenvalues, and the sparse degree is proposed to be estimated from the histogram which can reveal the sparse distribution of eigenvalues. Combining the nonnegative and sparse features, the NMF-based ship detection method can be implemented flexibly and efficiently. It has been carried out on the C-band quad polarimetric synthetic aperture radar (PolSAR) and dual PolSAR ocean data sets to validate its effectiveness. Unlike a constant-false-alarm-rate detector, the NMF method does not depend on target size and therefore offers improved detection performance under low-signal-to-clutter-ratio conditions.
    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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    Mesoscale Terrestrial Laser Scanning of Fluvial Gravel Surfaces (2011)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publikationsdatum: 2011-11-01
    Beschreibung: Terrestrial laser scanning (TLS) point cloud data were gathered in the field of exposed gravel surfaces for sampling sites with a spatial extent of 6m × 6m. We propose in this letter a novel two-stage mean-based filter scheme for processing the point cloud to generate the digital surface model (DSM) at a resolution of 1 cm. To the authors' knowledge, this letter reports the first work of generating a DSM of a gravel surface of such a large spatial extent with high spatial resolution using TLS. The elevation variations attributed to gravel clasts and single grains can both be captured in the point cloud data. To eliminate data voids due to the obstruction of the line of sight, a multiple-scan strategy is employed, which includes four scans at the corners of the sampling site and two supplementary scans for the central 2m × 2m area. The resultant DSM exhibits good agreement with elevation profiles obtained using a traditional manual profiler. The proposed method is an effective tool for obtaining a quality DSM of fluvial gravel surfaces using TLS with fewer scans than previous study.
    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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    High-Resolution SAR Radargrammetry: A First Application With COSMO-SkyMed SpotLight Imagery (2011)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publikationsdatum: 2011-11-01
    Beschreibung: The availability of new high-resolution radar spaceborne sensors offers new interesting potentialities for the acquisition of data useful for the generation of Digital Surface Models (DSMs). Two different approaches may be used to generate DSMs from Synthetic Aperture Radar (SAR) data: the interferometric and the radargrammetric one. At present, the importance of the radargrammetric approach is rapidly growing due to the new high-resolution imagery [up to 1 m Ground Sample Distance (GSD)] which can be acquired by COSMO-SkyMed, TerraSAR-X and RADARSAT-2 in SpotLight mode. The defined and implemented model is related to COSMO- SkyMed SpotLight imagery in zero-Doppler geometry; it performs a 3-D orientation based on two range and two zero-Doppler equations, allowing for the least squares estimation of some calibration parameters, related to satellite position and velocity and to the range measure. The model has been implemented in SISAR (Software per Immagini Satellitari ad Alta Risoluzione), a scientific software developed at the Geodesy and Geomatic Institute of the University of Rome “La Sapienza”. Starting from this model, based on a geometric reconstruction, also a tool for the Rational Polynomial Coefficients (RPCs) generations has been implemented. To test the effectiveness of the new model, a stereo pair over the test sites of Merano (Northern Italy) has been orientated using the rigorous model and the RPCs one, and first results of radargrammetric DSM generation are presented; they display the possibility to reach an overall average accuracy of 3.5 m.
    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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