Comparison of reflectance with backscatter and absorption parameters for turbid waters

Whitlock, C. H.; Poole, L. R.; Usry, J. W.; Houghton, W. M.; Witte, W. G.; Morris, W. D.; Gurganus, E. A.

doi:10.1364/ao.20.000517

Cited by 103 publications

(34 citation statements)

References 8 publications

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“…Values of the coefficient r t for 18 Dutch inland waters ranged from 0.12 to 0.56 and appeared to be lakespecific (Dekker, 1993), which is in agreement with the research of Whitlock et al (1981) and Kirk (1991). However, more knowledge of j3(Q) is required before an explanation can be found for this large range in the r t coefficient .…”

Section: State Of the Aet: Remote Sensing Of Inland Waterssupporting

confidence: 77%

Remote sensing, ecological water quality modelling and in situ measurements: a case study in shallow lakes

Dekker

Zamurović-Nenad

Hoogenboom

et al. 1996

Hydrological Sciences Journal

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The application of high spectral and spatial resolution airborne remote sensing has developed to an almost operational level. This paper investigates the role of remote sensing especially coupled to the two other available water quality assessment tools: in situ measurements and ecological water quality modelling data. A case study is presented for three shallow lakes varying in trophic level. Based upon a similarity index it is demonstrated that remote sensing provides valuable additional information for chlorophyll-a, seston dry weight and Secchi depth measurements, as compared to the two other water quality assessment tools. Télédétection, modélisation écologique de la qualité de l'eau et mesure in situ: étude de cas de trois lacs peu profonds Mésumé La télédétection aéroportée à haute résolution spectrale et spatiale a atteint un niveau quasi-opérationnel. Cet article s'attache à évaluer le rôle de la télédétection, en particulier lorsqu'elle est associée à deux autres outils disponibles pour apprécier la qualité de l'eau: la mesure in situ et la modélisation écologique de la qualité de l'eau. L'étude de cas qui est présentée ici concerne trois lacs de faible profondeur et de niveaux trophiques différents. Fondée sur un indice de similitude, cette étude démontre que, comparée aux deux autres outils d'appréciation de la qualité de l'eau, la télédétection fournit de précieuses informations complémentaires en ce qui concerne la chlorophylle-a, la cyanophycocyanine, le poids sec du seston et la transparence mesurée au disque de Secchi.

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Section: State Of the Aet: Remote Sensing Of Inland Waterssupporting

confidence: 77%

Remote sensing, ecological water quality modelling and in situ measurements: a case study in shallow lakes

Dekker

Zamurović-Nenad

Hoogenboom

et al. 1996

Hydrological Sciences Journal

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“…wn 780 a () 780 w Few direct measurements of spectral backscatter are available (Tassan and Ferrari 1995;Whitlock et al 1981), especially for the NIR. However, extrapolation of measurements of the scattering coefficient (Gould et al 1999;Babin et al 2003a) to the NIR and assumption of a spectrally constant scattering to backscattering ratio (at least over the limited spectral range considered) suggests that for highly scattering waters dominated by nonalgae particles, n is likely to lie within the range 0-1. n ϭ 1 is shown by Sydor et al (2002) to give good agreement for seaborne reflectance measurements in an equation equivalent to Eq.…”

Section: Theory and Radiative Transfer Modelingmentioning

confidence: 99%

“…However, according to Whitlock et al (1981), even the use of secondorder terms may not provide a realistic approximation to the full radiative transfer problem for high b b : a. The associated assumption of Eq.…”

Section: Theory and Radiative Transfer Modelingmentioning

confidence: 99%

Seaborne measurements of near infrared water-leaving reflectance: The similarity spectrum for turbid waters

et al. 2006

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Theory and seaborne measurements are presented for the near infrared (NIR: 700-900 nm) water-leaving reflectance in turbid waters. According to theory, the shape of the NIR spectrum is determined largely by pure water absorption and is thus almost invariant. A ''similarity'' NIR reflectance spectrum is defined by normalization at 780 nm. This spectrum is calculated from seaborne reflectance measurements and is compared with that derived from laboratory water absorption measurements. Factors influencing the shape of the similarity spectrum are analyzed theoretically and by radiative transfer simulations. These simulations show that the similarity spectrum is valid for waters ranging from moderately turbid (e.g., water-leaving reflectance at 780 nm of order 10 Ϫ4 or total suspended matter concentration of order 0.3 g m Ϫ3 ) to extremely turbid (e.g., reflectance at 780 nm of order 10 Ϫ1or total suspended matter of order 200 g m Ϫ3). Measurement uncertainties are analyzed, and the air-sea interface correction is shown to be critical for low reflectances. Applications of the NIR similarity spectrum to atmospheric correction of ocean color data and to the quality control of seaborne, airborne, and spaceborne reflectance measurements in turbid waters are outlined.Although ocean color remote sensing has focused primarily on visible wavelengths (400-700 nm) where photosynthetic pigments have detectable absorption features, there is a growing interest in water-leaving reflectances at near infrared (NIR) wavelengths, usually taken as the range 700-1,000 nm. There are essentially three reasons for this. First, although for atmospheric correction over clear waters the NIR water-leaving reflectance can usually be taken as zero (Gordon and Wang 1994), for turbid waters it is essential to model or estimate NIR water-leaving reflectance in order to 1 Corresponding author (K.Ruddick@mumm.ac.be). 2 Present address: Polytechnic of Namibia, P/Bag 13388, Windhoek, Namibia. AcknowledgmentsThis study was funded by the Belgian Science Policy Office's STEREO program in the framework of the BELCOLOUR project SR/00/03, by the European Union under the REVAMP project EVG1-CT-2001-00049, and by PRODEX contract 15190/01. The captains, crews, and support staff of the research vessels Belgica and Zeeleeuw are thanked for their enthusiastic help with the seaborne measurements. Jean-Paul Huot and the scientists of the RE-VAMP project and the MERIS Validation Team are especially thanked for the many discussions that have helped to improve and control the quality of the seaborne measurements. Wolfgang Cordes of GKSS is acknowledged for the tests on polarization and droplet sensitivity of spectroradiometers. Rudiger Heuermann of TriOS and Jean-Pierre De Blauwe and André Pollentier of MUMM-Oostende are thanked for help with system design; Barbara Van Mol for help with figure preparation; Bouchra Nechad for discussions on the use of the near infrared (NIR) range for total suspended matter (TSM) retrieval; and Arnold Dekker for discussion of op...

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“…Several models for ocean, coastal and inland waters were investigated by Gordon et al (1975), Morel and Prieur (1977), Whitlock et al (1981), Kirk (1991) and Dekker and Donze (1994). A simple optical water quality model based on the work of Gordon et al (1975) was calibrated for measurements of optical water constituent concentrations and IOP:…”

Section: Calibration Of Gordon's Optical Water Quality Modelmentioning

confidence: 99%

Retrieval of marine water constituents from AVIRIS data in the Hudson/Raritan Estuary

Bagheri

Peters

2005

International Journal of Remote Sensing

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Comparison of reflectance with backscatter and absorption parameters for turbid waters

Cited by 103 publications

References 8 publications

Remote sensing, ecological water quality modelling and in situ measurements: a case study in shallow lakes

Remote sensing, ecological water quality modelling and in situ measurements: a case study in shallow lakes

Seaborne measurements of near infrared water-leaving reflectance: The similarity spectrum for turbid waters

Retrieval of marine water constituents from AVIRIS data in the Hudson/Raritan Estuary

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