Simulation of the medium-resolution imaging spectrometer (MERIS) performance for detecting chlorophyll-a over turbid inland waters

H.J. Hoogenboom; Arnold G. Dekker

doi:10.1117/12.266481

6 February 1997 Simulation of the medium-resolution imaging spectrometer (MERIS) performance for detecting chlorophyll-a over turbid inland waters

H.J. Hoogenboom, Arnold G. Dekker

Author Affiliations +

Proceedings Volume 2963, Ocean Optics XIII; (1997) https://doi.org/10.1117/12.266481
Event: Ocean Optics XIII, 1996, Halifax, Nova Scotia, Canada

Abstract

The availability of imaging spectrometers such as the airborne AVIRIS, CASI, ROSIS, HYDICE and future spaceborne instruments such as MERIS and MODIS has created a necessity for spectral methods and models which can predict the performance of these instruments for detecting and estimating chlorophyll-a (CHL) as a water quality indicator. The aim of this study is to gain insight into the performance of MERIS for estimating CHL in turbid inland waters. In such waters with CHL ranging from 10 to over 300 (mu) g 1^-1 estimation of CHL using the fluorescence line height does not apply anymore. The research was carried out by means of bio-optical modeling, which yields the subsurface irradiance reflectance R(0-) from the water constituent concentrations, using the inherent optical properties as parameters. The inherent optical properties are measured with laboratory spectrophotometers and they are applied for simulation of water types ranging from clear drinking water to turbid eutrophic waters. These simulations enabled the quantification of the effect of increasing chlorophyll-a on R(0-). In addition a sensitivity analysis was applied. The change in R(0-) due to a change of 1 (mu) g 1^- in CHL was compared to the noise equivalent reflectance as specified for ocean applications of MERIS< which gives an indication of the accuracy for estimating chlorophyll-a. From the simulation results it was concluded that MERIS can estimate chlorophyll-a in turbid inland water with an accuracy of 1 (mu) g 1^- for CHL values of 10 (mu) g 1^- for CHL values of 190 (mu) $g 1^-. Furthermore, variations in the backscatter to scatter ratio of 25 percent, based on recent measurements of the volume scattering function, yielded a variation of 17-20 percent in the reflectance.

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H.J. Hoogenboom and Arnold G. Dekker "Simulation of the medium-resolution imaging spectrometer (MERIS) performance for detecting chlorophyll-a over turbid inland waters", Proc. SPIE 2963, Ocean Optics XIII, (6 February 1997); https://doi.org/10.1117/12.266481

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