Abstract
The south western states of Nigeria have witnessed urban growth over time and the effect of this is urban growth has resulted in loss of vegetation, waterbody, bare soil, mangroves and gain in built up area for residential and commercial purposes. This research utilizes Remote Sensing techniques in mapping of Land Use/Land Cover changes that has taken place in south western states of Nigeria between a period of 15 years from 2003 to 2018 at a five year interval using Multi temporal Landsat satellite images (MSS, TM, and ETM+).Using supervised classification algorithm, the images were classified into bare soil, built-up area, vegetation and water body, which was used to carry out change detection analysis or time series analysis. Change detection analyses were carried out on the imageries to obtain the physical expansion of the area due to various land use. Results obtained from the analysis of built-up area dynamics for fifteen years revealed that the states have been undergoing urban expansion processes at the detriment of other landcover. The expansion of the built-up area from the analysis shows that the urban center is spreading to adjoining non-built-up areas in all directions. The analysis and quantification of the spatial trend revealed that urban expansion patterns and developmental processes of the past trends and present trends can provide better understanding of the dynamics of spatial increase in built up area and guide for sustainable urban development planning for future urban growth.
Highlights
In an urban environment or our environment in general, natural and humaninduced activity have resulted in changes in our environment
Change detection analysis (Table 4) reveals that there was remarkable decrease in annual rate of change in the bare soil within Ekiti state, the results shows that between 2003 to 2008, it was (-2.50%) and (-0.85%) between 2008 and 2013, while during the period of 2013 to 2018 there was an increase with an annual rate of change of +2.50%
Land use and land cover data are important for an understanding of how environmental systems function, and their assessment over time provides a means for assessing the impact that any changes in land use may have on biodiversity and ecosystems
Summary
In an urban environment or our environment in general (either urban or rural), natural and humaninduced activity have resulted in changes in our environment. The natural state of our environment has been altered over years i.e. human activities such as construction of built up areas for either residential or commercial purposes have resulted in changes in the natural state of the environment. Information on land use / land cover and possibilities for their optimal use is essential for the selection, planning and implementation of land use schemes to meet the increasing demands for basic human needs and welfare. This information assists in monitoring the dynamics of land use resulting out of changing demands of increasing population.
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