Distortions sources in the Brazilian geodetic network
Abstract
The Brazilian Geodetic Network started to be established in the early 40’s,
employing classical surveying methods, such as triangulation and trilateration. With
the introduction of satellite positioning systems, such as TRANSIT and GPS, that
network was densified. That data was adjusted by employing a variety of methods,
yielding distortions in the network that need to be understood. In this work, we
analyze and interpret study cases in an attempt to understand the distortions in the
Brazilian network. For each case, we performed the network adjustment employing
the GHOST software suite. The results show that the distortion is least sensitive to
the removal of invar baselines in the classical network. The network would be more
affected by the inexistence of Laplace stations and Doppler control points, with
differences up to 4.5 m.
employing classical surveying methods, such as triangulation and trilateration. With
the introduction of satellite positioning systems, such as TRANSIT and GPS, that
network was densified. That data was adjusted by employing a variety of methods,
yielding distortions in the network that need to be understood. In this work, we
analyze and interpret study cases in an attempt to understand the distortions in the
Brazilian network. For each case, we performed the network adjustment employing
the GHOST software suite. The results show that the distortion is least sensitive to
the removal of invar baselines in the classical network. The network would be more
affected by the inexistence of Laplace stations and Doppler control points, with
differences up to 4.5 m.
Keywords
Rede Geodésica Brasileira; Distorção; Ajustamento; Sistema Geodésico Brasileiro; Distortion; Adjustment; Brazilian Geodetic Network
