Second order control extension in Millennium City, Chikun Local Government Area, Kaduna State, Nigeria

Abstract

GNSS control establishment is a continuous exercise in the field of Geomatics. This forms the basis upon which other surveys and engineering works geared toward development are referenced. This study employed the use of Hi-Target GNSS to extend and establish control stations within the study area in static mode. The control points were situated in such a way that they are free from disturbances, multipath and open for satellite acquisition. Observations were made between 90 to 120 minutes depending on the baseline length. To extrapolate this, three existing primary controls were selected for connection, checked for in-situ, and found to be in good condition for use. A minimum of fifteen (15) satellites were acquired by the GNSS receivers during observation with a dilution of precision (PDOP) value range of 1.2 to 2.8. The recorded data were downloaded and processed with the Hi-target Geomatics Office software. Network adjustment, for the newly established control stations, was carried out while the master station was held fixed. The final coordinates from the post-processing were plotted using QGIS 2.18.23. In conclusion, further research should be carried out in the study area to break the network of the control points established into shorter distances.