Determinação das coordenadas geodésicas de marcos de apoio geodésicos em Dois Vizinhos

Abstract

The static relative positioning is one of the practices offered by the global navigation satellite system and allows to determine any position on the terrestrial globe. This work aims to determine ellipsoidal coordinates of geodetic landmarks in the municipality of Dois Vizinhos – Paraná, Brazil, to be made available as support landmarks for scientific and professional work in the region. For this, the landmark approved by the IBGE, called station 96153 was defined as a reference mark for the other points determined. In addition, reference stations of the Brazilian Network for Continuous Monitoring (RBMC) were used. The landmarks from which the coordinates were determined are located at the Federal Technological University of Paraná (UTFPR), which are UTFPR 01 and UTFPR 02. Another landmark is located in the urban area of the municipality, in the Emergency Care Unit (UPA), in the Sagrada neighborhood Family. According to the criteria established by the IBGE, the static relative positioning technique was used, where the reference receiver and the point of interest remained stationary tracking simultaneously for at least 6 hours, in four sessions. Data processing was carried out in relation to the stations belonging to the RBMC of Guarapuava (PRGU), Foz do Iguaçu (ITAI), Maringá (PRMA) and Chapecó (SCCH). Station 96153 was not used for processing the landmarks, UTFPR01 and UTFPR02 because it is a very compromised reference station due to its obstructions around the landmark, indicating a higher error when compared to the results obtained by the RBMC. For the processing and adjustment of field data, the Trimble Business Center software was used. The comparative result of the UPA landmark when processed in relation to the RBMC bases and station 96153, resulted in a positioning discrepancy of ΔN= ± 0.075 m, ΔE = ± 0.242 m and ΔH = ± 0.857m. Whereas the baseline between station 96153 and the UPA landmark has a short baseline, about 1.5 km. However, the obstruction situation of benchmark 96153 resulted in errors greater than the standard deviation allowed by the norm. While the baseline between the UPA landmark and the RBMC stations considered long, that is, greater than 100km, resulted in minimal errors compared to the standard established by Brazilian legislation for this type of positioning. It is concluded that the UTM plane-Cartesian coordinates, spindle 22 S, SIRGAS 2000 of each landmark are: UTFPR01 N 7155400.163m E 289451.357m and H 554.600m; UTFPR02 N 7155427.670m E 289435,482m and H 556.526m; UPA N 7149515.330m E 292797.631m and H 489.073m and station 96153 N 7150414.756m E 294021.679m and H 511.542m. A comparison wasmade between the results of the 96153 work station with the IBGE geodetic station report, where a high discrepancy was observed, mainly in the altitude value (ΔH = ± 2.758 m).