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AFRgeo_v1.0: A Geoid Model for Africa

Abd-Elmotaal, Hussein A.; Seitz, Kurt; Kühtreiber, Norbert; Heck, Bernhard

Abstract:
The paper presents an attempt to compute a geoid model for Africa in the framework of the IAG African Geoid Project. The available gravity data set consists of land point gravity data as well as shipborne and altimetry-derived gravity anomaly data, having a lot of significant gaps allover the continent. The reduced gravity anomalies are gridded on a 50´ x 50´ grid using an iterative process employing a tailored reference model, to fill in the data gaps, and a weighted least-squares prediction technique. The tailored reference model, up to degree and order 2160, has been used to compute a geoid model for Africa within the window remove-restore technique employing the Stokes integral in frequency domain by the 1-D FFT technique. For the sake of comparison, another geoid model for Africa has been computed using a different approach. This approach renounces the use of the topographic-isostatic reduction and uses the recent global combined geopotential model EIGEN-6C4, complete to degree and order 2190, serving as the reference model. The computed geoids are scaled using the GO_CONS_GCF_2_DIR_R5 GOCE satellite-only model, which represents the best available global geopotential model approximating the African gravity field. ... mehr

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Volltext §
DOI: 10.5445/IR/1000097013
Veröffentlicht am 08.08.2019
Coverbild
Zugehörige Institution(en) am KIT Geodätisches Institut (GIK)
Publikationstyp Forschungsbericht
Jahr 2019
Sprache Englisch
Identifikator ISSN: 2194-1629
KITopen-ID: 1000097013
Verlag KIT, Karlsruhe
Umfang 19 S.
Serie KIT Scientific Working Papers ; 125
Schlagworte geopotential theory, inverse theory, numerical modelling, window technique
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