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Regional Models

State of São Paulo - Brazil (GEOID-SP)

  Authors: G.N. Guimarães, et al.     Created: 2014    Resp: G.N. Guimarães  
      Status: PUBLIC    

The GEOID-SP models of the State of Sao Paulo, Brazil, have been computed on a 5'x5' grid by the remove-restore technique using two different methodologies: the modified Stokes integral used FFT through spheroidal Molodenskii-Meissl kernel modification and the Least Squares Collocation (LSC). The models are based on the same dataset of free-air gravity anomalies. The reference geopotential model is GO_CONS_GCF_2_DIR_R5 up to degree and order 200 for the FFT methodology, while GO_CONS_GCF_2_DIR_R3 for LSC. The SAM3s_v2 DTM has been used for the computation of terrain correction and other topographic and atmospheric effects. The mean free-air gravity anomaly (FA) in a 5' grid over continent has been derived from the complete Bouguer Anomalies (FA over the ocean obtained from satellite gravity model DTU10). The computed points are in a grid of 5'x5' covering the area from 17.0417000° S to 27.9583667° S in latitude, and from 55.9583000° W to 42.0416333° W in longitud. Geoidal heights are referred to WGS84. Data are stored in ASCII format, first column is longitud, second column is latitude, third column is geoid undulation.

G.N. Guimares, D. Blitzkow, R. Barzaghi, A.C.O.C. Matos (2014). The Computation of the Geoid Model in the State of Sao Paulo Using Two Methodologies and GOCE Models. Boletim de Ciencias Geodesicas (Online), vol. 20, pp. 183-203.