Compatibilização de referenciais de coordenadas e velocidades com estimativa de precisão

Abstract

The transformation of coordinates and velocities between realizations of ITRS (International Terrestrial Reference System) and update of coordinates should become routine task in geodetic surveys due to the use of dynamic reference systems and the movement of tectonic plates. In this study, it was performed the compatibilization of the reference frames (ITRF2000, ITRF2005, and ITRF2008) of coordinates and velocities with estimation of precision considering propagation of variance of 11 stations distributed in the North American, South American, and Eurasian plate tectonics. Based on the coordinates in the ITRF2008, epoch 2005 and ITRF2005, epoch 2000.0, obtained by IERS (International Earth Rotation and Reference System Service), it was verified that 54.55% of the horizontal discrepancies are on the order of centimeters and 45.45% are on the order of decimeters. By comparing the coordinates in the ITRF2008, epoch 2005.0 and ITRF2000, epoch 1997.0, it was found horizontal discrepancies on the order of decimeters for all stations. However, comparing the coordinates of ITRF2000, epoch 1997.0, obtained by IERS, with the computed coordinates based on transformations between reference frames and updates, it was found horizontal discrepancies on the order of millimeters in 72.73% of the sites and on the order of centimeters in 27.27%. The analyzes confirm that it is necessary to update and make the compatibilization of coordinate reference systems and velocities in order to increase the accuracy in the positioning