30 years of absolute gravity measurements in Brazil
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Abstract
The Brazilian Geodetic System is composed by reference stations that gather information about the altimetric, planimetric (geocentric in a contemporary definition) and gravimetric components. The last one plays a major role in areas such as Geodesy, Geology and Geophysics, and in this decade has achieved greater evidence of the events surrounding it. Highlights the new values of the reference heights, based on the geopotential number, presented by the Brazilian Institute of Geography and Statistics in July 2018, as well as the efforts that are being expended for the implementation of the International Height Reference System. The aim of the paper is to present the absolute gravity measurements carried out since 1989 with the National Absolute Gravimetric Network. A highlight emphasizing the reobservation in that network, as well as the current gravimetric efforts in the country is presented. Besides that, a review is provided about absolute measures methods and gravimeters employed in the last 30 years. Lastly, a relationship in drawn between absolute stations distribution in the country and the International Height Reference Frame stations.
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