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MERIS in-flight spectral calibration / S. Delwart in International Journal of Remote Sensing IJRS, vol 28 n°3-4 (February 2007)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 28 n°3-4 (February 2007) . - pp 479 - 496 Titre : MERIS in-flight spectral calibration Type de document : Article/Communication Auteurs : S. Delwart, Auteur ; R. Preusker, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 479 - 496 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] absorption [Termes IGN] capteur en peigne [Termes IGN] étalonnage en vol [Termes IGN] étalonnage spectral [Termes IGN] image à moyenne résolution [Termes IGN] image spectrale [Termes IGN] Medium Resolution Imaging Spectrometer [Termes IGN] spectromètre imageur Résumé : (Auteur) This paper will describe the spectral calibration activities conducted during the MERIS commissioning phase and during operation since orbit 12000. MERIS is a medium resolution (300-1200m) push-broom imaging spectrometer covering the spectral domain 390-1040nm with 15 bands, programmable in position and width down to steps of 1.25nm. The onboard spectral calibration hardware is based on the use of an Erbium doped-diffuser panel presenting well-defined absorption peaks. In the spectral calibration mode, MERIS is configured with narrow bands centred on an Erbium absorption feature (two are used). The first orbit, the instrument is calibrated by viewing the "white" radiometric diffuser plate and the following orbit the "pink" Erbium diffuser plate is deployed. This method allows each of the MERIS detectors involved to be characterized in wavelength. The Fraunhofer absorption lines were used to complement these results by providing additional measurements in the violet and near infrared part of the spectrum. For this method, MERIS was configured both for Earth and diffuser observations and acquired data for only a limited number of orbits. This procedure was repeated for different band settings covering a number of Fraunhofer absorption lines. Finally, using Oxygen (O2A) absorption Earth observation data, two different approaches were developed, one based on the retrieval of surface pressure and one based on the shape of the O2A absorption band. Both methods were developed for clear sky land observations, but their performances are improved over bright land targets. Both methods agree to within an accuracy of 0.02 nm. The results from the different methods are analyzed in order to propose a spectral model for the MERIS instrument. Preliminary results of the spectral variation with time are reported. Except camera 4, the instrument is quite stable with time. Camera 4 needs further investigations to better understand its behaviour. Except for the use of the MERIS oxygen band, the spectral characterization of the other MERIS bands is achieved within the nominal accuracy (1 nm). Copyright Taylor & Francis Numéro de notice : A2007-089 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160600821119 En ligne : https://doi.org/10.1080/01431160600821119 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28454 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-07021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Regional products for the Baltic Sea using MERIS data / H. Krawczyk in International Journal of Remote Sensing IJRS, vol 28 n°3-4 (February 2007)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 28 n°3-4 (February 2007) . - pp 593 - 608 Titre : Regional products for the Baltic Sea using MERIS data Type de document : Article/Communication Auteurs : H. Krawczyk, Auteur ; A. Neumann, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 593 - 608 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] Baltique, mer [Termes IGN] chlorophylle [Termes IGN] données de terrain [Termes IGN] eaux côtières [Termes IGN] estimation statistique [Termes IGN] image Envisat-MERIS [Termes IGN] littoral [Termes IGN] qualité des eaux [Termes IGN] réflectance [Termes IGN] sédiment [Termes IGN] temps réel Résumé : (Auteur) For many questions of the coastal zone management, the knowledge on the biological and ecological state of coastal waters is of high importance. Due to the complexity of this water type, characterized by different classes of water constituents, a sophisticated methodology needs to be applied for quantitative remote sensing. Within the MAPP-Project (MERIS Applications and Regional Products Project) a specific remote sensing interpretation algorithm was developed for the regional assessment of water constituents in the Baltic Sea. This is a part of the ESA Cat-1 proposal ID 1413 GEMEL-3 ("Generation of MERIS Level-3 products for European multidisciplinary regional applications"). The operational implementation in a MERIS-value-adding system allows a near real-time estimation of chlorophyll sediment and gelbstoff concentrations on a regular basis. The algorithm, based on a principal component inversion (PCI) technique and the model will be introduced. The applicability of the model will be demonstrated on a couple of comparisons of MERIS reflectances and in-situ measurements. The potential of the model shall be demonstrated on available MERIS data. Copyright Taylor & Francis Numéro de notice : A2007-090 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160600815558 En ligne : https://doi.org/10.1080/01431160600815558 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28455 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-07021	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Validation of MERIS Level-2 products in the Baltic Sea, the Namibian coastal area and the Atlantic Ocean / T. Ohde in International Journal of Remote Sensing IJRS, vol 28 n°3-4 (February 2007)  

Public [article]  inInternational Journal of Remote Sensing IJRS > vol 28 n°3-4 (February 2007) . - pp 609 - 624 Titre : Validation of MERIS Level-2 products in the Baltic Sea, the Namibian coastal area and the Atlantic Ocean Type de document : Article/Communication Auteurs : T. Ohde, Auteur ; H. Siegel, Auteur ; M. Gerth, Auteur Année de publication : 2007 Article en page(s) : pp 609 - 624 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] analyse comparative [Termes IGN] Atlantique (océan) [Termes IGN] Baltique, mer [Termes IGN] données de terrain [Termes IGN] image Envisat-MERIS [Termes IGN] Indien (océan) [Termes IGN] littoral [Termes IGN] Namibie [Termes IGN] océan [Termes IGN] réflectance de surface [Termes IGN] validation des données Résumé : (Auteur) Measurements of water-leaving reflectance and optically active water constitu-ents in the Baltic Sea, the Namibian coastal area and the Atlantic Ocean were performed to validate MERIS Level-2 products. Two different validation methods were applied with the recommended match-up analysis based on comparison of in situ measurements with MERIS Level-2 products of simultaneous Envisat overpasses and the second analysis on comparison of natural variation ranges with derived MERIS product ranges. The MERIS water-leaving reflectances correlate to in situ shapes and magnitudes in all investigated areas. The comparison shows mean deviations of MERIS reflectances between 23% and 26% for the current official instrument processing facility (IFF 4.07) but only 20% for the prototype version 7.0 up to now only available to the validation team. The comparison of water constituents shows the underestimation of MERIS ALGAL_2 index, YSBPA and TSM in turbid waters of the Baltic Sea of the current instrument processing facility (IFF 4.07). The mean MERIS ALGAL_1 index is close to in situ values but the mean MERIS ALGAL_2 index, the MERIS YSBPA and MERIS TSM products are still too low in Namibian coastal areas for the prototype version 7.0. The investigations demonstrate the quality improvement of all MERIS Level-2 products from the current official instrument processing facility to the prototype version 7.0. Copyright Taylor & Francis Numéro de notice : A2007-091 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160600972961 En ligne : https://doi.org/10.1080/01431160600972961 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28456 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
080-07021	RAB	Revue	Centre de documentation	En réserve L003	Disponible