Análise de medidas lineares, angulares e posicionais obtidas com estações totais e GNSS/RTK

Abstract

The NBR 13.133 (Topographic Survey Execution Standard) is the Standard that establishes the necessary parameters for the execution of topographic surveys, seeking to control the quality of the land-based data obtained in these surveys. Among the parameters cited in this Standard, the tolerances defined for linear and angular errors, which should not be exceeded in topographic works, stand out. Some total stations, owned by the Federal University of Uberlândia, have presented values of linear and angular errors that exceed the tolerance indicated in the Standard. In this context, the present work aimed to carry out the surveys of a polygon (implanted in the unit UFU / SESI), applying different methods of linear and angular surveys, to verify the accuracy of the measurements performed with two FOIF total stations. The geodesic coordinates of this same polygon were obtained with a GNSS / RTK geodetic receiver and admitted as the field truth. The linear and angular errors were evaluated according to the tolerances indicated by the NBR 13.133. The positional error, originated from the comparison of the coordinates of the different topographic surveys applied in relation to the geodetic survey, were analyzed according to the RMSE values and statistical analysis of the F Test with a 95% confidence level. Although the linear measurements of both stations showed values within the tolerance, the total station No. 081814 presented uncertainty in its results for the angular measurements, with values out of tolerance. The equipment # 081816 was the only one present for the topographical surveys for polygons of type I and IIIP, presenting values of angular and linear measurements, for methods that are applied to data redundancies, within the tolerance specified in NBR 13.133, thus accepting the null hypothesis of the test of F.