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Hyperspectral airborne remote sensing of the Belgian coastal waters
Sterckx, S.; Debruyn, W.; Kempeneers, P. (2005). Hyperspectral airborne remote sensing of the Belgian coastal waters, in: Zagajewski, B. et al. (Ed.) Imaging spectroscopy. New quality in environmental studies: Proceedings of the 4th EARSeL Workshop on Imaging Spectroscopy, Warsaw, April 26-29 2005. pp. 293-299
In: Zagajewski, B.; Sobczak, M.; Wrzesien, M. (Ed.) (2005). Imaging spectroscopy. New quality in environmental studies: Proceedings of the 4th EARSeL Workshop on Imaging Spectroscopy, Warsaw, April 26-29 2005. EARSeL/Warsaw University: Warsaw. 151 pp.
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| Auteurs | | Top |
- Sterckx, S.
- Debruyn, W.
- Kempeneers, P.
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| Abstract |
On the 16th of June 2003 a CASI (Compact Airborne Spectrographic Imager) hyperspectral airborne remote sensing campaign took place above the Southern North Sea, just offshore of Oostende. In coincidence with the airborne overpasses seaborne measurements of water leaving reflectance and water quality parameters were performed. In addition near-simultaneous satellite imagery are available. This paper deals with the analysis of the airborne data. The CASI data have been atmospherically corrected using the in-house software WATCOR which is based on the radiative transfer code MODTRAN-4 and takes into account atmospheric and air/water interface effects. The data are subsequently geometrically corrected with PARGE. A semi-analytical approach is used to retrieve the concentration of the water constituents: for chlorophyll determination a biooptically modelled red/NIR band ratio algorithm is applied to the data; to quantify the Suspended Particulate Matter a single band NIR algorithm, calibrated for the Belgian coastal waters is used. The results of these semi-analytical methods were compared to an analytical approach where the water quality parameters are retrieved from the subsurface irradiance reflectance spectra using a least square determination of chlorophyll-a (CHL), suspended particulate matter (SPM) and colored dissolved organic matter (CDOM) and requires as input the inherent optical properties (IOPs) of (specific) absorption and backscattering of the water constituents. |
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