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The effect of E-M wave's attenuation on sea surface reflectivity, emissivity and estimation of sea surface temperature / Q. Xu in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 5 (August 2006)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 60 n° 5 (August 2006) . - pp 295 - 305 Titre : The effect of E-M wave's attenuation on sea surface reflectivity, emissivity and estimation of sea surface temperature Type de document : Article/Communication Auteurs : Q. Xu, Auteur ; Y. Liu, Auteur ; Y. Cheng, Auteur Année de publication : 2006 Article en page(s) : pp 295 - 305 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Télédétection [Termes IGN] emissivité [Termes IGN] océanographie spatiale [Termes IGN] onde électromagnétique [Termes IGN] réflectivité [Termes IGN] surface de la mer [Termes IGN] télédétection en hyperfréquence [Termes IGN] température de surface de la mer Résumé : (Auteur) The imaginary component of the complex index of refraction denotes the attenuation of E-M waves in amplitude within the procedure of propagation in a medium. The attenuation of E-M waves in sea water is of great importance in microwave remote sensing, because the Snell's law of refraction in air–sea interface, sea surface reflectivity, sea surface emissivity and the estimation of sea surface temperature (SST) from microwave radiometer detections are all related to it. The well-known expressions of the reflectivity were derived in optics, but they cannot be applied directly to microwave remote sensing, since the E-M waves of microwave bands propagating in the sea water are greatly attenuated. In this study, a more appropriate formula of the reflectivity is proposed for the full range of E-M waves with considering the attenuation of E-M waves in the sea water. The proposed formula can be used to obtain the emissivity of sea surface, which is useful to estimate SST in microwave remote sensing. The error analysis indicates further that the proposed formula of the reflectivity is significant for improving ocean microwave remote sensing and increasing the retrieval accuracy of SST. Copyright ISPRS Numéro de notice : A2006-370 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.04.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.04.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28094 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-06051	SL	Revue	Centre de documentation	Revues en salle	Disponible

Additive integration of SAR features into multispectral SPOT images by means of the à trous wavelet decomposition / Y. Chibani in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 5 (August 2006)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 60 n° 5 (August 2006) . - pp 306 - 314 Titre : Additive integration of SAR features into multispectral SPOT images by means of the à trous wavelet decomposition Type de document : Article/Communication Auteurs : Y. Chibani, Auteur Année de publication : 2006 Article en page(s) : pp 306 - 314 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] fusion d'images [Termes IGN] image Radarsat [Termes IGN] image SPOT XS [Termes IGN] transformation de Brovey [Termes IGN] transformation en ondelettes [Termes IGN] transformation intensité-teinte-saturation [Termes IGN] Viet Nam Résumé : (Auteur) This paper aims to describe a method for integrating the Synthetic Aperture Radar (SAR) features into multispectral (XS) images using conjointly the modified Brovey transform (MBT) and the à trous wavelet decomposition (ATWD). The MBT is based on the intensity-hue-saturation (IHS) fusion method, which allows modulating locally each XS image by the ratio of the new intensity component and the initial intensity component in order to produce the new XS-SAR images. The ATWD allows extracting features from the SAR image in order to integrate through an additive procedure into the initial intensity component. The resultant new intensity component is then used for producing new XS-SAR images. In order to control the amount of SAR features to be integrated into XS images, a normalized importance measure is derived from the wavelet coefficients for selecting the significant SAR features according an adjustable threshold. SPOT-XS and RADARSAT-SAR images covering a region of Vietnam are used to evaluate visually and statistically the effect of the proposed method, in particular other existing methods in terms of spectral preservation and amount of SAR features integrated into XS images. Copyright ISPRS Numéro de notice : A2006-371 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2006.05.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2006.05.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28095 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-06051	SL	Revue	Centre de documentation	Revues en salle	Disponible