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Analysing urbanization processes: a case of Lekki-Epe expressway rehabilitation in Lagos, Nigeria

Chiedozie-Udeh, Nneka (2012) Analysing urbanization processes: a case of Lekki-Epe expressway rehabilitation in Lagos, Nigeria.

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Abstract:Investment in public infrastructure has an impact on the land cover and land use particularly in the neighbourhood where they are provided. When there is a positive effect of public infrastructure provision, households/individuals and firms would desire to live near those facilities because it means low transportation cost to places of work, close to urban centre and general increase in their welfare etc. Therefore there is likely to be more demand for urban properties than the supply in the property market in the short run; thus the value of properties would rise. With the increase in value of properties various actors who are interested in benefiting from the value increase will be attracted to the areas while others might be forced to relocate from the area as a result of the market force (market eviction). All these activities cause change in land cover and land use. This can be in the form of changing the cover type as well as changing or intensifying the use of land in the improved areas which thus alters the land value. This study therefore aims at feeling the gap of knowledge about the underlying behaviour of the processes that are behind the change in land cover/land due to provision of public infrastructure. To understand this change, it became crucial to do a land cover classification using the spatial units created from the multi- temporal images of before and after the road rehabilitation. Land cover was classified in a hierarchical order of 3 classes and 8 sub classes while urban development were classified into 5 classes using the classification guideline since there is no universally accepted classification scheme. Further to this, change detection was done through a change matrix which assigned a code to each value of change in ArcGIS to analyse the various type of changes that took place in space from 2002 - 2011. The analysis of the changes processes (socio- economic) was afterwards linked to the type of cover changes that were seen on the images so as to achieve the overall aim of this study. To achieve this, field data were collected on the tenure system, the neighbourhood characteristics, actors, survey procedures, transactions, property values and urban development, which are some of the change processes in land cover and land use. Our results demonstrated that land cover changed in three ways- conversion, geometrical and modification. The change by conversion was from one cover type to another; modification was within the same cover category with changes in the physical or functional attributes of spatial units while geometrical change occurred by the decrease or increase of the outer boundaries of units. Also the result showed that high class urban development were carried out mostly in area under the statutory tenure system by the private developers activities caused most of the change both geometrically and by conversion, whereas modification was seen in the areas dominated by households/individual and village settlement who act under the customary tenure system and put up low and medium class type of development. The government’ influenced the changes by providing most of the land that were utilised by the chief actor (the private developer) in the change process. We then concluded that that the analysis of the process behind urbanisation by the combination of these factors that were seen on ground with change in land cover has helped in understanding the types of change that were observed on images.
Item Type:Essay (Master)
Faculty:ITC: Faculty of Geo-information Science and Earth Observation
Programme:Geoinformation Science and Earth Observation MSc (75014)
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