{"refrec":{"BRefID":12983,"RR":"<b>Dupouy, C.; Arief, D.; Spitzer, D.</b> (1983). Optical remote sensing of waters and tidal flats in western Wadden Sea. <i>Interne verslagen Nederlands Instituut voor Onderzoek der Zee</i>, 1983(2). NIOZ: Texel. 45 pp.","BEntID":12983,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". <i>Interne verslagen Nederlands Instituut voor Onderzoek der Zee</i>, 1983(2). NIOZ: Texel.  45 pp.","DocTypID":13,"DocType":"Reports","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Dupouy, C.; Arief, D.; Spitzer, D.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Dupouy, C.; Arief, D.; Spitzer, D.","Englishabstract":"In order to investigate the optical remote sensing applications over the turbid waters and the tidal flats of the Wadden Sea, color measurements were performed during periods of three months in summer 1981 and of one week in 1982, combined from a mounted-tower and from an airplane. Relationships between the optical properties and the seatruth were developed. A simple type of algorithm appears to be useful: reflectance ratio at two wavelengths in relation to the component concentration. It appears possible to retrieve the different components of the waters like total and mineral suspended matter, pigment and chlorophyll a, as long as they are correlated to each other (which is the case in 1981), by using a ratio of red/green reflectances, from the tower, and a ratio of red/blue reflectances, from the airplane. Also the fluorescent effect of chlorophyll is detectable from airplane, which provides another method to determine the pigment concentration of the waters. The pigment concentration of the microphytobenthos, which gives a browngreen color and which is an important parameter for global production in the Wadden Sea, can be retrieved from the ratio of airborne reflectances green/blue. These relationships are the first results of remote sensing experiments above the Wadden area. Further measurements are needed, especially using airborne instruments to cover larger inhomogeneous areas and to provide a better statistical sample which is needed to validate these first results. More adapted methods for sampling the seatruth (continuous for example) are also necessary to get a better precision on the estimation of the different components. In a first conclusion, the remote sensing of the different components of the waters appears positive, despite the great particulate matter concentration of the waters which mask the effect of the others substances on the optical properties.","AbstractOtherLang":"Dans le but d'étudier les applications de la télédétection en eaux très turbides de la Mer de Wadden, deux séries de mesures de la couleur des eaux et de la vaste étendue vaseuse du Balgzand ont été effectuées en 1981 et en 1982 a différentes altitudes: d'une tour et d'un avion. Les relations entre les propriétes optiques et la \"vérité-mer\" ont été développées. Un type simple d'algorithme paraît satisfaisant: le rapport de réflectances à deux longueurs d'onde en relation linéaire (log-log) avec la concentration de chaque composante. Il paraît possible de retrouver les différents composants de l'eau, soit la matière totale ou minérale en suspension, pigments et chlorophylle a, tant qu'ils sont covariant entre eux (ce qui était le cas en 1981), en utilisant un rapport de réflectances \"rouge/vert\"pour l'expérience \"tour\" et un rapport \"rouge/bleu\" pour l'expérience \"avion\". La méthode de la fluorescence mesurée par avion s'avère être un succes dans ces eaux très riches en chlorophylle. La concentration en pigment du microphytobenthos, qui donne une coloration brun-vert à la vase, et qui est un paramètre important pour la production globale en Mer de Wadden peut être détectée par avion grâce à un rapport de réflectance rouge/bleu. Ces correlations représentent les premiers résultats d'une expérience inédite en Mer de Wadden. Un plus grand nombre de mesures par avion serait utile de manière a couvrir une étendue plus large et à fournir un meilleur échantillon statistique de façon à valider les premiers résultats. D'autre part, une meilleure méthode d'échantillonnage sur le terrain se révèle nécessaire pour obtenir des estimations plus précises des différentes constituantes. D'ors et déjà, on peut conclure que malgré l'extrême charge particulaire de ces eaux qui ont un effet masquant sur les propriétés optiques, on peut envisager la télédétection des eaux et de la vase, ce qui est essentiel pour connaître les variations rapides de la biomasse et cartographier la distribution très hétérogène de la turbidité.","BibLvlCode":"MS","StandardTitle":"Optical remote sensing of waters and tidal flats in western Wadden Sea","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2025-07-22 01:33:06.175990","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":null,"MonPub":1983,"DateUpdate":"2025-07-15","DateCreate":"2001-07-06","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":1},"refs":null,"anarec":null,"monrec":{"MonID":12983,"ISBN":null,"PubliDate":1983,"IssueDate":null,"Volume":"1983","Issue":"2","Pagination":"45","Place":"Texel","Edition":null,"BRefXtra":null,"BRefXtraRR":null,"SerID":5036,"SerRR":"Interne verslagen Nederlands Instituut voor Onderzoek der Zee. 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