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Inferred IOP and particulate matter from MERIS and MODIS multi-spectral satellite images

Schmeltz, Marjorie und Froidefond, Jean-Marie und Gege, Peter und Jourdin, Frédéric (2010) Inferred IOP and particulate matter from MERIS and MODIS multi-spectral satellite images. XII International Symposium on Oceanography (ISOBAY), 3.-6. Mai 2010, Brest, France.

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Kurzfassung

How to accurately determine and quantify particulate and dissolved matters at the water surface in coastal areas (case 2 waters) using passive ocean colour remote sensing is still a topical issue. The best actual models, like the OC5 algorithm from Gohin et al., 2002, are empirical, and usually restricted to a limited area; hence the need to gather numerous oceanographic data is strong. To improve our understanding of in-water radiation law, we tested a numerical bio-optical model with several components including bottom reflectance. The software called WASI (Water Colour Simulator) was developed by Peter Gege (Gege, 2004) and integrates forward and inverse modelling for eight common types of optical in-situ measurements in aquatic environments (in particular remote sensing reflectance, absorption or attenuation), using well-established analytical models. In forward mode, it simulates reflectance spectra using the IOP or the particulate and dissolved matters. In inverse mode, an input hyperspectral reflectance spectra measured with a spectro-radiometer is analyzed by fitting iteratively possible reflectance curves under constraints on some bio-optical parameters (simplex method) so as to provide the IOP and the particle concentrations. We used in-situ data acquired during the oceanographic mission OPTIC-CONGO (Gulf of Guinea) to evaluate the accuracy of the model results. The substance concentrations derived by the WASI model were compared with the in-situ measurements and the results are encouraging (Schmeltz et al., 2009). To apply this inversion to satellite data from MODIS (NASA) or ENVISAT/MERIS (ESA), we developed a multiple regression program adapted from Wernand (1997) to reconstruct hyperspectral reflectances from the multi-spectral satellite channels (10 bands for MODIS and 15 bands for MERIS). These reconstructed spectra are inverted in WASI to obtain the IOP and substances concentrations.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Inferred IOP and particulate matter from MERIS and MODIS multi-spectral satellite images
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Schmeltz, Marjorie Université Bordeaux 1
Froidefond, Jean-MarieUniversité Bordeaux 1
Gege, PeterPeter.Gege@dlr.de
Jourdin, Frédéric Service Hydrographique et Océanographique de la Marine
Datum:Mai 2010
Referierte Publikation:Nein
In ISI Web of Science:Nein
Seitenbereich:Seiten 1-2
Status:veröffentlicht
Stichwörter:Inherent optical properties, particulate matter, MODIS, WASI
Veranstaltungstitel:XII International Symposium on Oceanography (ISOBAY)
Veranstaltungsort:Brest, France
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:3.-6. Mai 2010
Veranstalter :CNRS & IFREMER
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Spektrometrische Verfahren und Konzepte der Fernerkundung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Methodik der Fernerkundung > Experimentelle Verfahren
Hinterlegt von: Dr.rer.nat. Peter Gege
Hinterlegt am:27 Okt 2010 13:35
Letzte Änderung:19 Feb 2013 13:51

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