Avaliação de métodos de Nivelamentos GNSS a partir da NBR 13.133/1994

Abstract

Engineering projects uses altitudes with physical significance that are obtained from geometric or trigonometric leveling. These methods are made in field walking along the line of levelling. However, these techniques can be unfeasible depending on the terrain conditions, such as rugged relief or dense forest. The GNSS leveling is an alternative that can be used to overcome such problems. However, the use of such method depends on some cares to transform the purely mathematical altitude of the GNSS to a physical sense altitude. In this study will be evaluated by the NBR 13.133/1994 the transformation of the altitude: relative method, absolute method and ∆N = 0 method. Among the methods mentioned above, method 2 obtained the best results.