Accuracy assessment of established control within University of Lagos, Nigeria

Abstract

This paper focuses on assessing the accuracy of established control within the University of Lagos campus. Taking full advantage of advancement and revolutions in surveying techniques, Differential Global Positioning System(DGPS) linked with Continuously Operating Reference Stations(CORS) was embraced for data acquisition to minimise the uncertainties surrounding the process. The acquired data was adjusted/reduced using Trimble Business Center and resulted in the production of a list of new coordinates. Besides, determined was Pearson correlation coefficient and t-statistics at ninety-nine per cent confidence level in Excel application for decision making between existing and newly acquired data. For the Eastings and Northings, the p-values were smaller (E = 0.002768695 and N = 0.00036642) than the 0.01 p-value specified for the computation; communicating the existence of a significant difference between the data thereby inferring the rejection of existing Eastings and Northings coordinates. For the Height, the p-value is larger (0.069657705) than the 0.01 entered value; signifying there exist no significant difference between the height data. Hence, we do not reject the existing elevation data. Finally, a map was produced in accordance with best surveying practices.