Avaliação do nivelamento utilizando GNSS e modelo geoidal em trecho de rodovia no estado de Goiás

Abstract

Due the technological advances and the constant innovations in geodetic positioning methods by the Global Navigation Satellite System (GNSS), the activities involving altimetric determinations are not limited to geometric leveling alone. The present research aims to evaluate the leveling using GNSS and geoidal model on 25 km stretch of Highway GO-180 in the Municipality of Jataí in the state of Goiás, through a comparative analysis between the geometric leveling method, established by NBR 13.133/2021 and the Instruction of Road Projects IP-02 GOINFRA, and the GNSS positioning method. The average discrepancy obtained by the difference in the levels, considering the geometric leveling as a reference, was 0.027 m with a standard deviation of 0.017 m. The mean square error, which expresses the accuracy of the differences obtained by the GNSS in relation to the geometric leveling, was 0.028 m. Considering the length of the leveled line, it is possible to consider that an error of 0.0012 m per leveled km has been made. This error may be higher or lower in different situations and regions in Brazil due to factors such as the density of stations in the region and the GNSS technique used.