Analysis of MERIS data for assessing the water quality in Lake Guiers (SENEGAL). Preliminary results.
Seybatou Diop(1) and Souleye Wade(1)
(1) Université Cheikh Anta Diop de Dakar, BP 5396 Dakar-Fann Sénégal, 221 Dakar, Senegal
We used moderate resolution imaging spectroradiometer (MERIS) 1B image product acquired on April, 27, 2007 to run the FUB algorithm (Schroeder and Schaale, 2005) for chlorophyll-a (CHL-a), suspended particulate matter (SPM) and colored dissolved organic matter (CDOM) concentrations retrieval in Lake Guiers waters. These parameters were found to be in the range: 30 -117 mg CHl-a / m3 l (mean 62.13); 0.10 - 29.0 mg SPM / m3 (mean 22.01) and 1.10 - 1.90 CDOM m-1 (mean1.33). We were not able to fully access the detection accuracy of these results due to insufficient or lacking ground truths. Nonetheless, the results show CHL-a and SPM concentrations that compare well with point in situ data from early studies, suggesting (i) the capability of this technique as a tool for lakes water quality monitoring, and (ii) the reliability of the method upon the availability of in situ data for validation purposes.
Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,