keywords: Geographic information system, Lagoon, spatial changes, wetland
This study tries to examine the effect of urbanization on wetland and biodiversity in the mangrove forest of Lagos state, Nigeria. Two scenes of Landsat TM (Thematic Mapper) of 18th December, 1984 and ETM+(Enhanced Thematic Mapper) of December 2006 were processed to extract the wetlands, mangroves and water bodies across the area of study. ENVI software was used along with parallelepiped supervised classification in processing the Land-sat images. Results showed that the mangrove wetlands and swamps decreased annually both between 1990 and 2000. It was further seen that the highest decline in the Mangrove was recorded in Epe LGA while that of swamps shows that the highest decline in swamp wetland occurred in Epe and Ibeju-Lekki council area of Lagos State. Results further show that mangroves which were widespread in seven council areas around these lagoons in 1990, have dwindled to only four councils in 2000. In conclusion therefore, the relevance of spatial plans employing image processing analysis and geo-information in revealing wetland loss within the study area was necessary. Relevant recommendation was also made in this study.
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