Brazilian Geodetic System
GPS State Networks
The state GPS networks respond to the increasing present demands in terms of artificial satellite positioning techniques. As an example, we can cite the Law no 10,267/01, implemented by INCRA (National Institute for Colonization and Agricultural Reform), aimed at georeferencing all the rural properties in the country and taking the Brazilian Geodetic System – SGB as its reference.
The purpose of establishing the state GPS networks is to ensure that all Federation Units have a highly accurate and interconnected network referred to the Brazilian Network for Continuous Monitoring (RBMC), which is the main geodetic structure of the national territory.
By December of 2006, 13 state GPS networks had been set (covering 18 states): São Paulo, Paraná, Minas Gerais, Mato Grosso, Mato Grosso do Sul, Santa Catarina, Rio de Janeiro, Rio Grande do Sul, Bahia, Ceará, Espírito Santo, Acre and the Northeast network. The Northeast network was a different case as it was established during only one measurement campaign, encompassing the states of Alagoas, Sergipe, Pernambuco, Paraíba and Rio Grande do Norte.
The location of the benchmarks is previously chosen in cooperation with the representatives of federal, state and municipal institutes. The intention is to protect their physical integrity, that is, avoid impacts that may interfere with their coordinates or cause their destruction.
The implementation of a state geodetic network enables the development of the following products and information:
Therefore, IBGE has caught up with Geodesy since 1939 in order to provide a planimetric structure compatible with the accuracy level consistent with the state-of-the-art technology.