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Regional Models

South America


  Authors: A.C.O.C. de Matos, et al.     Created: 2010    Resp: D. Blitzkow  
      Status: PUBLIC    

Description:
The South America geoid model has been computed on a 5' x 5' grid, by the remove-restore technique using 925,878 point gravity data (free-air gravity anomalies), EGM2008 to degree and order 150, 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 gravity model DNSC08). The short wavelength component was estimated with the use of the modified Stokes integral used FFT through spheroidal Molodenskii-Meissl kernel modification. The reference field used was EGM2008 up to degree and order 150. 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. 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:
A.C.O.C. de Matos, D. Blitzkow, G.N. Guimaraes, M.C.B. Lobianco (2014). GOCE and the Geoid in South America. In: C. Rizos, P. Willis (eds.), Earth on the Edge: Science for a Sustainable Planet, IAG Symposia Series, vol. 139, pp. 529-534, Springer Verlag.

South America