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Radar imaging of moving targets in foliage using multifrequency multiaperture polarimetric SAR / G. Wang in IEEE Transactions on geoscience and remote sensing, vol 41 n° 8 (August 2003)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 41 n° 8 (August 2003) . - pp 1755 - 1764 Titre : Radar imaging of moving targets in foliage using multifrequency multiaperture polarimetric SAR Type de document : Article/Communication Auteurs : G. Wang, Auteur ; X.G. Xia, Auteur ; V. Chen, Auteur Année de publication : 2003 Article en page(s) : pp 1755 - 1764 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications [Termes IGN] données polarimétriques [Termes IGN] feuille (végétation) [Termes IGN] forêt [Termes IGN] image radar moirée [Termes IGN] objet mobile [Termes IGN] polarimétrie radar [Termes IGN] polarisation Résumé : (Auteur) Because of the low signal-to-clutter ratio, it is a difficult problem to detect and image moving targets in foliage. In this paper, a multifrequency multiaperture polarimetric synthetic aperture radar (MFMA POLSAR) system is proposed for imaging of moving targets in foliage. The MFMA POLSAR extends the multifrequency antenna array SAR (MFSAR) system to multiple the polarizations. Full polarization is used in MFMA POLSAR to achieve an optimal polarization adaptive to the environment such that the images obtained by different apertures are of the best coherence that is used to obtain the highest accuracy of the phase estimation. It is also shown that the MFMA POLSAR cannot only accurately locate both the slow and the fast moving targets but also reveal moving targets in foliage. Numéro de notice : A2003-277 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2003.813501 En ligne : https://doi.org/10.1109/TGRS.2003.813501 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22572 [article]

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Road vectors update using SAR imagery: a snake-based method / L. Bentabet in IEEE Transactions on geoscience and remote sensing, vol 41 n° 8 (August 2003)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 41 n° 8 (August 2003) . - pp 1785 - 1803 Titre : Road vectors update using SAR imagery: a snake-based method Type de document : Article/Communication Auteurs : L. Bentabet, Auteur ; S. Jodouin, Auteur ; D. Ziou, Auteur ; J. Vaillancourt, Auteur Année de publication : 2003 Article en page(s) : pp 1785 - 1803 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] chatoiement [Termes IGN] contour [Termes IGN] extraction du réseau routier [Termes IGN] filtre de déchatoiement [Termes IGN] mise à jour de base de données [Termes IGN] virage Résumé : (Auteur) The paper presents an approach for roads detection based on synthetic aperture radar (SAR) images and road database The vectors provided by the database are refined using active contours (snakes). In this framework, we firstly develop a restoration filter based on the frost filter achieving an acceptable compromise between speckle elimination and lines preserving. This is followed by a line plausibility calculation step which is used to deform the snake from its initial location toward the final solution. The snake is reformulated using finite elements method. The setting of the snake parameters is not an obvious problem especially when they are tuned by trialanderror process. We propose a new automatic computational rule for the snake parameters. Our approach is validated by a series of tests on synthetic and SAR images. Numéro de notice : A2003-278 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2003.813850 En ligne : https://doi.org/10.1109/TGRS.2003.813850 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22573 [article]

Exemplaires(1)

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Fully polarimetric microwave radiometer for remote sensing / J. Lahtinen in IEEE Transactions on geoscience and remote sensing, vol 41 n° 8 (August 2003)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 41 n° 8 (August 2003) . - pp 1869 - 1878 Titre : Fully polarimetric microwave radiometer for remote sensing Type de document : Article/Communication Auteurs : J. Lahtinen, Auteur ; J. Pihflyckt, Auteur ; I. Mononen, Auteur ; et al., Auteur Année de publication : 2003 Article en page(s) : pp 1869 - 1878 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] instrument de mesure [Termes IGN] polarimétrie [Termes IGN] radiomètre à hyperfréquence [Termes IGN] télédétection en hyperfréquence [Termes IGN] vent Résumé : (Auteur) The design, characteristics, and operation of the Helsinki University of Technology Fully Polarimetric Radiometer (FPoR) are described. The developed 36.5-GHz radiometer can be used for airborne remote sensing ; however, ground-based and laboratory measurements are also possible. A direct crosscorrelation technique with analog correlators, which measures all four Stokes parameters simultaneously, is applied. This paper is the first successful demonstration of an analog direct crosscorrelation technique for polarimetric remote sensing radiometry. The radiometer was subjected to a variety of laboratory tests, and considerable attention is given to analysis of the characteristics of the instrument. Owing to the effective active temperature control system of the receiver, the radiometric stability of the instrument was found to be very high ; test results showing stabilities below 10 mK and of 440 mK on time scales of 800 and 8000 s, respectively, are presented. Furthermore, the absolute accuracy of the system is analyzed to be at a sub-Kelvin level for most measurement conditions. A maritime wind vector experiment was carried out over the Gulf of Finland. The feasibility and performance of the applied correlation technique and the whole radiometer system were verified for fully polarimetric airborne measurements. The obtained brightness temperatures of the first three Stokes parameters show typical harmonic behavior with respect to the surface wind ; the results suggest, however, that the model coefficients presented earlier for oceans may not be directly applicable for different conditions. Numéro de notice : A2003-279 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2003.813847 En ligne : https://doi.org/10.1109/TGRS.2003.813847 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22574 [article]

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A comparison of BRDF models for the normalization of satellite optical data to a standard sun-target-sensor geometry / R. Latifovic in IEEE Transactions on geoscience and remote sensing, vol 41 n° 8 (August 2003)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 41 n° 8 (August 2003) . - pp 1889 - 1898 Titre : A comparison of BRDF models for the normalization of satellite optical data to a standard sun-target-sensor geometry Type de document : Article/Communication Auteurs : R. Latifovic, Auteur ; J. Cihlar, Auteur ; J. Chen, Auteur Année de publication : 2003 Article en page(s) : pp 1889 - 1898 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] analyse comparative [Termes IGN] changement climatique [Termes IGN] distribution du coefficient de réflexion bidirectionnelle BRDF [Termes IGN] éclairement lumineux [Termes IGN] image NOAA-AVHRR [Termes IGN] image optique [Termes IGN] image SPOT-Végétation [Termes IGN] rayonnement solaire [Termes IGN] réflectance de surface [Termes IGN] tâche claire Résumé : (Auteur) Climate change studies require consistent, long time series, surface reflectance data. The characterization of the bidirectional reflectance distribution function (BRDF) is important for normalizing the solar radiation reflected from the earth's surface. We evaluated four BRDF models to identify the preferred approach to the normalization of multiyear National Oceanic and Atmospheric Administration Advanced Very High Resolution Radiometer (AVHRR) and SPOT4VEGETATION (VGT) composite images to a common illumination and viewing geometry. Four models by the following authors were included: Walthall, Ropjean, Ross-Li, and a new nonlinear temporal angular model (NTAM). NTAM accounts for hotspot effects and also responds to seasonal changes in land cover properties (using vegetation indexes as surrogate temporal measures). We compared the performance of the models under different scenarios of coefficient derivation and model application including model ability to reproduce theoretical BRDF curves, model consistency in single, multiyear, and incomplete sampling schemes, and comparison of AVMR and LANDSAT Thematic Mapper surface reflectance prior and after BRDF normalization. We found that in all the tests, NTAM yielded the best fits between the observed and estimated values. NTAM requires eight coefficients and a lengthier iterative procedure to derive the coefficients, but the resulting coefficients are applied to the entire growing season rather than one temporal window. NTAM also performed well for different sensors (AVHRR, VGT) and geographic areas (Canada, east Asia, southern United States). Our results contradict the often-encountered perception that semiempirical BRDF models for angular normalization are all similarly effective, and the research on this topic is mature. We also describe a procedure for routine normalization of satellite optical data. For northern ecosystems, the NTAM coefficients derived from AVHRR and VGT data for Canada are available via ftp://Ccrs.nrcan.gc.ca. Numéro de notice : A2003-280 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2003.811557 En ligne : https://doi.org/10.1109/TGRS.2003.811557 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22575 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
065-03081	RAB	Revue	Centre de documentation	En réserve L003	Disponible