News Update: Research report: Assessment of Chlorophyll-a Concentrations in Lagos lagoon

News Update: Research report: Assessment of Chlorophyll-a Concentrations in Lagos lagoon

A research carried out by A. O. AYENI, Department of Geography, University of Lagos, Lagos, Nigeria; T. A. ADESALU, Department of Botany, University of Lagos, Lagos, Nigeria; and J. K. ARO, Department of Geography and Environmental Management, University of Ilorin, Ilorin, Nigeria, concluded that concluded that the Landsat 7 and 8 images were effective in estimating chl-a concentration and producing chl-a spatio-temporal map


The researchers stated that remote sensing data is another possible option for mapping chlorophyll-a (Chl-a) present in all phytoplankton species.

The study estimates chlorophyll-a concentration in Lagos Lagoon using Landsat 7 (ETM+) and Landsat 8 (OLI) data.

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The Landsat data were first geometrically corrected. The techniques used were band rationing and regression modelling.

The brightness values were converted to reflectance through the radiometric correction process, while the regression models, logarithmically transformed chlorophyll-a was used as the dependent variable. The single bands, band ratios and logarithmically transformed band ratios were used as the independent variables.


Subsequently, the R2 values were computed and calculated using the results generated from regression models. The Chl-a concentration generated showed reasonable results but the concentrations across the study lagoon was impacted by the ocean current with distance from Atlantic Ocean.

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The study concluded that the Landsat 7 and 8 images were effective in estimating chl-a concentration and producing chl-a spatio-temporal map.

AYENI, A. O.; ADESALU, T. A.; ARO, J. K.. Assessment of Chlorophyll-a Concentrations in the Lagoon, Lagos State, Nigeria. Ife Research Publications in Geography, [S.l.], v. 16, n. 1, p. 13-24, oct. 2018. ISSN 2636-5243. Available at: https://irpg.oauife.edu.ng/index.php/irpg/article/view/136. Date accessed: 03 mar. 2021.

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