New Geoid Model in the State of São Paulo
The purpose of this manuscript is to present some efforts in terms of gravity measurements in the State of São Paulo with the aim to improve the geoid model, and to show the establishment of an absolute gravity network in this state. The efforts resulted in a geoid model called GEOIDSP, limited by 19°S and 26°S in latitude and 44°W and 54°W in longitude, which has been derived using the modified Stokes’ integral through Fast Fourier Transform (FFT). Another objective of this study is to verify the potentiality of GOCE-based models. The spectral decomposition was employed in the geoid models computation and the long wavelength component was represented by GOCE-based models up to degree and order 200. The models were compared in terms of absolute comparisons from GPS/leveling and the results show consistency between them. EIGEN6C3STAT model and GO_CONS_GCF_2_DIR_R4 presented the same results (0.18 m), in terms of RMS, while GO_CONS_GCF_2_TIM_R4, 0.20 m. In the case of absolute gravity measures, 18 stations are being measured (15 news and 3 re-occupations).
KeywordsRecent GGM São Paulo geoid modeling Spectral decomposition
The first author acknowledges CAPES for the grant that allowed him to participate in the IGFS meeting. The state of São Paulo benefited from a sharp improvement in the distribution of gravity data through the thematic project sponsored by FAPESP (Process: 2006/04008-2).
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