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Retrieval of dissolved inorganic nitrogen from multi-temporal MODIS data in Haizhou Bay / Y. Xu in Marine geodesy, vol 33 n° 1 (January - March 2010)  

Public [article]  inMarine geodesy > vol 33 n° 1 (January - March 2010) . - pp 1 - 15 Titre : Retrieval of dissolved inorganic nitrogen from multi-temporal MODIS data in Haizhou Bay Type de document : Article/Communication Auteurs : Y. Xu, Auteur ; Y. Zhang, Auteur ; D. Zhang, Auteur Année de publication : 2010 Article en page(s) : pp 1 - 15 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] analyse diachronique [Termes IGN] azote [Termes IGN] baie [Termes IGN] données multitemporelles [Termes IGN] image Terra-MODIS [Termes IGN] Kiangsou (Chine) Résumé : (Auteur) It is important to map dissolved inorganic nitrogen (DIN) concentrations in order to accurately predict the outbreak of red tides. This study aims to determine the feasibility of retrieving DIN in Haizhou Bay, East China from multi-temporal MODIS satellite data and to assess the impact of DIN concentration level on its inversion accuracy. DIN was modeled from the reflectance of MODIS bands and their combinations both linearly and nonlinearly. It was found that individual MODIS bands are loosely correlated with DIN concentrations. Of the various combinations of multiple bands, bands 3 and 4 bear a highly positive correlation with DIN concentrations. In particular, (R3 + R4)/(R3 - R4) is a more accurate predictor of DIN than R3 times R4/(R3 - R4). All the regression models involving this exploratory variable have an R2 value over 0.7 and a relative accuracy of around 70%. However, regression residuals are dependent of each other for DIN 70 ug/L in murky coastal waters. During the study period of 2004-2006, Haizhou Bay experienced a deteriorating trend in DIN in that low concentration areas decreased while areas of a high DIN concentration level expanded. Numéro de notice : A2010-186 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1080/01490410903530257 Date de publication en ligne : 10/07/2014 En ligne : https://doi.org/10.1080/01490410903530257 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30381 [article]

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