Reference Gravity Frame in Latin America

Denizar Blitzkow, Iuri Moraes Björkström, Ana Cristina Oliveira Cancoro de Matos, Valéria Cristina Silva, Gabriel do Nascimento Guimarães, Edvaldo Simões da Fonseca Junior

Abstract


With the development of the ballistic gravimeter in the late 80s, the efforts to establish reliable absolute gravity reference around the world became a reality. The need for the so-called International Terrestrial Gravity Reference Frame (ITGRF[1]) to substitute the IGSN 71 (International Gravity Standardization Net 1971) is one of the demands of modern Geodesy. In that context, the Laboratório de Topografia e Geodesia, Escola Politécnica da Universidade de São Paulo (LTG/EPUSP), Brazil, started in 2013, with the acquisition of the A10 no 32 (A10-032) absolute gravimeter, a large number of campaigns to measure gravity acceleration in the states of São Paulo, Minas Gerais, Paraná and abroad. The gravimeter was purchased by Instituto Geográfico e Cartográfico (IGC), state of São Paulo. After eight years of operation under the coordination of the Centro de Estudos de Geodesia(CENEGEO) and with the support of different institutions, a total of five national Gravity Reference (GR) was established: Argentina, Brazil, Costa Rica, Ecuador and Venezuela. The present efforts are the selection of a set of local GR in the different countries of Latin America and a possible contribution to the ITGRF.

[1] The ITGRS/F acronyms were approved by IAG JWG 2.1.1 in April 2022, replacing the former IGRS/F acronyms.


Keywords


absolute gravity; Gravity Reference; Latin America



DOI: http://dx.doi.org/10.22564/brjg.v40i5.2141







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