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MAPPING AND ANALYSIS OF TRANSPORTATION NETWORK OF ONITSHA METROPOLIS USING REMOTE SENSING AND GIS TECHNIQUES
Uzochukwu O. S., Igbokwe J. I., Ojiako J. C. and *Amusa I. A.
In recent times, Transportation System has been in a very bad state due to the deteriorating state of our intra and inter-city roads around the country including Onitsha. The problem of not getting to destinations on time by the roads users on time and a lot of artificial difficulties are encountered on roads on daily basis. This is also important in these days of COVID-19 pandemic where evacuation of victims is of utmost priorities. The aim of the study is to map and analyze the road transportation network of Onitsha using Remote Sensing and GIS techniques. The objectives include designing a geodatabase for the entities of interest in the study area; acquisition of 1.0m resolution Ikonos image of the study area from where the features of interest were extracted through head-on digitizing; creation of a suitable geodatabase and spatial analyses like queries, network analysis to generate best and alternative routes. The methodology involved database design and implementation. It was shown at the end of the study that total road segments were in good condition, 20.61% represents roads in fair condition and 65.36% of the total road segments are in bad condition. The difference in travel distances from the Head Bridge to the Central Police Station (CPS) using the Best and Alternative routes is 50.20m. This is an indication that the best routes are always shorter than the alternative routes all things being equal. The recommendations at the end of the study include paving of bad roads with asphalt and providing functional drainage systems.[Full Text Article]