Geodetic control extension at erosion prone areas using integrated CORS-GNSS in Benin City, Edo State Nigeria

Abstract

This study addresses the imperative expansion of geodetic controls in erosion-prone areas of Benin City, with a focus on establishing controls in specific schools. Two observation campaigns were conducted on nine monumented controls with 36 baselines and another set of eight controls with 28 baselines. Data adjustments were successfully carried out using Trimble Business Centre software, at 10.00σ confidence level and 1.00% significance for the tau test in the second iteration of both campaigns. Analysis revealed varying accuracy levels among stations. Notably, stations ADLC_01, ADLC_02, and QSS_01 demonstrated a minimum latitude accuracy of 1.3 mm, while AGGS_01 and AGGS_02 showcased the highest accuracy at 1.7 mm. Similar trends were observed in longitude and height measurements. For longitude, the maximum standard deviation (3.3 mm) was recorded at ENV_101D station, while the minimum accuracy (1.7 mm) was obtained at station AGGS_01. The minimum accuracy in height (3.5 mm) was recorded at station AGGS_01, while the maximum accuracy (6.7 mm) was recorded at station SMGGS_01. These findings provide essential insights into the accuracy of geodetic controls in Benin City based on purposeful selected schools, serving as valuable information for future research, infrastructure development, and engineering projects execution