Minas Gerais State - Brazil (QuGe-MG)
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Authors: G.N. Guimarães, et al.
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Created: 2022
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Resp: G.N. Guimarães
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Description:
The gravimetric quasi-geoid model for the State of Minas Gerais covers the longitude range of -38º to -53º and the latitude range of -12º to -25º, with a resolution of 5 arc minutes. A total of 49,067 terrestrial gravity values were utilized to compute Molodenski's gravity anomalies. The quasi-geoid model was computed by the Least Squares Collocation method. The XGM2019 geopotential model up to degree and order 300 was employed to represent the long-wavelengths of the gravity field. The digital terrain model SRTM15+ was selected for the RTM computation, while the DTU17 gravity field model was used in oceanic areas. The quasi-geoid model was validated against 136 GNSS/leveling stations, yielding a bias of 23 cm and a standard deviation of 11 cm.
Model Citations:
G.N. Guimarães, D. Blitzkow, V.C. Silva, A.C.O.C. Matos, M.E.B. Inoue, S.L. Oliveira (2022). The gravimetric quasi-geoid of Minas Gerais State: QuGe-MG-2022. V. 1.0. GFZ Data Services. DOI: 10.5880/isg.2022.001
Reference:
G.N. Guimarães, D. Blitzkow, V.C. Silva, A.C.O.C. Matos, M.E.B. Inoue, S.L. Oliveira (2022). New Gravimetric Infrastructure in Southeast Brazil: From Absolute Gravity Network to a Geoid Model. Journal of Surveying Engineering, 148, 04022002, pp. 1-12. DOI: 10.1061/(ASCE)SU.1943-5428.0000393
Digital object identifier:
DOI: 10.5880/isg.2022.001 ((quasi-geoid in ISG forma)
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