ANÁLISE DE DADOS DE GRAVIMETRIA MARINHA: ESTUDO DAS ESTAÇÕES GEODÉSICAS PRÓXIMAS AO LITORAL BRASILEIRO NO CONTEXTO DA INFRAESTRUTURA INTERNACIONAL DE REFERÊNCIA ALTIMÉTRICA

Analysis of marine gravity data: study to the Brazilian near coast geodetic stations in the context of the international height reference frame

Abstract

The need for an integrated geodetic framework has brought together many researchers in geodesy in order to provide a consistent realization that includes temporal variations of the Earth and, for this purpose, it is necessary to use quantities measured on the earth's surface. The acceleration of gravity is one of those quantities, but its measurement is often hampered by natural conditions, such as in oceanic areas where measurement is of lesser quality than on the Earth's surface, requiring greater attention in the data treatment before use. Despite this, marine gravity data can provide greater detail to coastal areas that are not provided by satellite data. Therefore, in this research, the analysis of marine gravity data was developed around two geodetic stations, CEFT e IMBT, that will be part of the International Height Reference Frame (IHRF). For this, different methodologies of adjustment and/or comparison were used, in which marine gravity data from different surveys were compared with two global gravity models resulting from satellite altimetry. After analysis, the area adjustment method showed more consistent results.