THE USE OF GEOGRAPHIC INFORMATION SYSTEM IN THE MANAGEMENT OF GEODETIC CONTROL NETWORKS FOR SURVEYING AND MAPPING

ABSTRACT

Geodetic control networks provide the fundamental framework for accurate and consistent surveying and mapping. This project explores the application of Geographic Information Systems (GIS) for effective management of geodetic control networks in Ovia North East Local Government Area of Edo state. The method adopted for this study was utilization of GNSS in data acquisition (coordinate points) in Ovia north East LGA. The tripod was set up in a leveled ground while the handheld GPS was used to establish a known point for data capturing in various coordinate point in Ovia Northeast LGA. Data captured where in the handheld GPS which were later downloaded into GIS interface. GIS was then used to create data base for the data collected after it was arranged and then used in map creation. The results obtained from the study revealed that some of the coordinates of the control pillars shifted from the original position due to human activities arising from large land scale development currently ongoing in the area. A detailed map showing the Geodetic controls in Ovia northeast was created which shows the spatial location of Okada control, Oluku control, Isiohor control and the Benin Akure control also a well-structured geodatabase that helps to store the controls was also created using ArcMap. This study also reveals the spatial distribution of the control points within the local government and accesses their adequacy for surveying and mapping and the analysis revealed that the control points are clustered within a specific region in the local government.