Data Processing for a Geoid Model in Argentina

Abstract

Instituto de Física Rosario (IFIR), Facultad de Ciencias Astronómicas y Geofísicas de La Plata (FCAGLP), in a cooperation with the Politechnic School of the University of Sao Paulo (EPUSP), have been involved in the last few years in an effort for the determination of the Argentinian geoid. For this purpose as many gravity data as possible have been compiled and tests were undertaken in order to solve the problems concerning the quality of the data. The main gravity data set was basically compiled at IFIR. This data base consists of about 15.000 gravity stations, mainly from IGM (Instituto Geográfico Militar) and from National Universities. They were referred to different references, so that in a first step transformations were performed in order to have the gravity values homogeneously related to IGSN 71. The gravity anomalies have been computed and referred to WGS 84. Taking advantage of the South American Gravity Project (GETECH — University of Leeds), links have been established between IFIR, IGM, the Sub-Commission for the Geoid in South America (SCGSA) and GETECH. In this way new efforts have been carried out in the last few years to improve the gravity data coverage and the DTM. For this purpose topographic maps have been digitised, in particular in the Andes, and a 3’x3’ grid generated for Argentina. All these efforts are described in the paper.