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ABSTRACT
Urban Growth affects land cover at local, regional and global scales. Like other towns in Nigeria, Idanre is growing at a very fast rate. The consequence of such urban growth unplanned is theadverse effects on the environment. The aim of this research is to analyze the impact of topography on urban expansion in Idanre, in Idanre Local Government Area of Ondo State, Nigeria using Remote Sensing and Geographic Information (GIS) techniques. LandSat Thematic Mapper (TM) 2002, Landsat Enhanced Thematic Mapper (ETM+) of 2011 and Lansat 8 (OLI) data of 2021 were used. The datasets were processed and classified into land use/land cover classes using supervised classification technique in ArcGIS 10.1. The built-up area and urban net change were extracted separately and the rates of growth between the periods (2002-2021) were ascertained. The built-up areas for the three time periods were overlaid in order to derive the urban growth map. The results revealed that built-up increased from 40.50km2 in 2002 to 80.50 Km2 in 2021 while forest land reduced from 1164.21Km2 to 986.46Km2 within this same period. The built up in the study area was increasing at the rate of 3.05% yearly while the forest land declined at the rate of 0.32% per annum within the period (2002-2021) studied. The finding in this study reveals that Idanre town is experiencing expansion but is been limited by the presence of the hill. If this hindrance is not address early, it will lead to slow rate of development and expansion. This will lead to lack of xii land space for building of infrastructure, break in communication between Idanre and its surrounding neighbor. It is therefore recommended that Remote Sensing and Geographic Information System (GIS) technique which have proved to be efficient in the monitoring of urban growth be utilize efficiently to monitor hindrances in urban growth. This would help to control the rate of expansion and development in the town.
