Papers by Carlos Otoo-Kwofie
Height refers to the vertical distance of a point above or below a reference datum. Ordinary Leve... more Height refers to the vertical distance of a point above or below a reference datum. Ordinary Level offers accurate height values, but its use is time-consuming, labor intensive and limited in sighting distances. The GNSS technology is making such traditional methods of surveying unpopular in Ghana. This study uses simple linear regression analysis, root mean square errors, calculation of residuals and graphs to assess the reliability of differential GPS/GLONASS observations made with dual frequency receivers and compared with MSL heights determined trigonometrically. The study area covers the major roads in Accra. The road sections with a total chainage of about 13km includes a section of George Walker Bush Motorway (N1), Olusegun Obasanjo Highway and a section of the Liberation road.The Trimble combined GNSS receivers (R4) and the Sokkia 1’’ Total Station (Set 310) were used for the data collection. The Geoidal separations (undulations) for the study area were estimated using Allt...
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Papers by Carlos Otoo-Kwofie