2002 | OriginalPaper | Chapter
Quasi-geoid estimations in South America
Authors : R. Barzaghi, A. Borghi, F. Sanso, D. Blitzkow, M. C. Lobianco, S. C. Kenyon, J. Beale, J. Factor
Published in: Gravity, Geoid and Geodynamics 2000
Publisher: Springer Berlin Heidelberg
Included in: Professional Book Archive
Activate our intelligent search to find suitable subject content or patents.
Select sections of text to find matching patents with Artificial Intelligence. powered by
Select sections of text to find additional relevant content using AI-assisted search. powered by
A report on quasi-geoid computations in South America, based on the existing gravity data base collected in the framework of the South America Gravity Project (SAGP) is presented. Two estimation methods will be described. One of these is the standard “remove-restore” technique. The gridding of the residual gravity values (i.e. free air gravity anomalies minus the global geopotential model and the terrain effect) has been performed using, with some Refsinements, the GEOGRID program of the GRAVSOFT package (Tscherning et al, 1994) and the residual quasi-geoid signal has been evaluated through the ID FFT approach (Haagmans et al., 1993) which allows a fast and rigorous computation of this component. The second approach is based on ID FFT method applied on mean Helmert’s gravity anomalies, having removed the low frequency components using EGM96 model up to degree 50.