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The use of airborne hyper-spectral remote sensing for mapping water bodies in the Cape Flats area of Cape Town, South Africa

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A hyper-spectral airborne campaign was conducted in August 2005 in Cape Town, South Africa to map water constituents as chlorophyll a (Chl) and total suspended solids (TSS) in two relatively small inland water bodies. The sensor employed in this campaign was the AISA-ES, a hyper-spectral airborne imager with a spectral range spanning from 400 to 2370 nm. Ground-truthing was carried out simultaneously with the flights over the water bodies; water samples were taken from various locations in both bodies of water for laboratory analysis. Reflectance spectra were used for the estimation of -Chl and TSS concentrations, which ranged from 7 to 45 mg L-1 for TSS and from 5 to 245 μg L-1 for Chl. The optical information was used for construction of quantitative thematic maps of the spatial distribution of these water constituents. This work demonstrates the suitability of hyper-spectral airborne technology for mapping the concentrations of water constituents in relatively small water bodies.

Affiliations: 1: Elbit Systems Electro-optics—Elop Ltd., P.O. Box 1165 Rehovot 76111, Israel ; 2: Disaster Management, City of Cape Town ; 3: Scientific Services ; 4: Elbit Systems Electro-optics—Elop Ltd.


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