South America (GEOID2015)
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Authors: D. Blitzkow, et al.
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Created: 2015
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Resp: A.C.O.C. de Matos
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Description:
The new South America geoid model has been computed on a 5' x 5' grid, by the remove-compute-restore
technique using 947,953 point gravity data (free-air gravity anomalies), the SAM3s_v2 DTM 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 was derived from the complete BA (FA over the ocean
obtained from satellite altimetry model DTU10).
The short wavelength component was estimated with FFT technique using the modified Stokes integral through
spheroidal Molodenskii-Meissl kernel modification. The reference field used was EIGEN-6C4 up to degree and
order 200.
The computed points are in a grid of 5' x 5' covering the area from 56.9583333° S to 14.9583333° N in
latitude, and from 94.9583333° W to 30.0416667° W in longitude. The geoidal heights are referred to WGS84.
Data are stored in grd format, i.e. parallelwise from N to S and W to E. (N° values in lat = 864, N° values
in long = 780, total number of data = 673920).
References:
D. Blitzkow, A.C.O.C. de Matos, G. do Nascimento Guimaraes, M.C. Pacino, E.A. Lauria, M. Nunes, C.A. Correia e
Castro Junior; F. Flores, N.O. Guevara, R. Alvarez, J.N. Hernandez (2016). Gravity and geoid model for
South America. EGU General Assembly 2016, Geophysical Research
Abstracts, Vol. 18, EGU2016-1626.
Web of Science ID:
DRCI:DATA2018029012462778
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