ESTABLISHMENT OF THIRD ORDER CONTROLS WITH DIFFERENTIAL GLOBAL POSITIONING SYSTEM (DGPS) WITHIN UNIVERSITY OF MAIDUGURI

Abstract

This research aimed at establishing both vertical and horizontal controls within the University of Maiduguri. The provision of such control network will help in conducting accurate surveying work as it will serve as reference station with known coordinates (easting, northing and height).Three coordinates of second order control stations were collected from Borno Geographic Information Service (BOGIS): BSC 008, BSC 009 and BSC 010 respectively and were used as reference stations. With the help of Google earth imagery, the actual location of these controls was identified on the ground and suitable stations for the controls were established. Twelve set of controls were established and numbered as GMT 001 to GMT 012. Differential Global Positioning System (High target) was used for the observation on the controls and their coordinates were given in real time after been subjected to least square adjustment as a standard goal data for control establishment.