Análise dos métodos de posicionamento e dos parâmetros definidores da qualidade de um levantamento batimétrico

Abstract

The positioning method to be employee in a bathymetric survey is questioned about the horizontal and vertical precisions. In a general way, the vessel positioning in hydrographic surveys has been determined through the Differential GPS (DGPS). Upon consulting the literature, it was observed that few investigations regarding to the precision and accuracy of these methods were done when such surveys occur in reservoirs. Therefore, the main objective of the present work is to perform precisions and accuracies analyzes regarding to positioning of the vessel, through the methods as DGPS, Precise Point Positioning (PPP) and Kinematic Relative Positioning (MPRC). All results were inserted into a Geographic Information System (GIS), in which it was observed that the results were more precise for the MPRC. However, it was concluded that it is also possible to use the IBGE-PPP online service to process the positioning data of the geodetic marks and the vessel getting a precision lower than a meter. In conclusion, all methods investigated for positioning the vessel are in agreement with the specifications of the Resolution ANEEL/ANA n° 03 of August 10th, 2010. Nevertheless, it is important to follow the minimum requirements for each positioning method.