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A Precise Geoid Model for Africa: AFRgeo2019

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

Abstract (englisch):
In the framework of the IAG African Geoid Project, an attempt towards a precise geoid model for Africa is presented in this investigation. The available gravity data set suffers from significantly large data gaps. These data gaps are filled using the EIGEN-6C4 model on a 15′× 15′ grid prior to the gravity reduction scheme. The window remove-restore technique (Abd-Elmotaal and Kühtreiber, Phys Chem Earth Pt A 24(1):53–59, 1999; J Geod 77(1–2):77–85, 2003) has been used to generate reduced anomalies having a minimum variance to minimize the interpolation errors, especially at the large data gaps. The EIGEN-6C4 global model, complete to degree and order 2190, has served as the reference model. The reduced anomalies are gridded on a 5′× 5′ grid employing an un-equal weight least-squares prediction technique. The reduced gravity anomalies are then used to compute their contribution to the geoid undulation employing Stokes’ integral with Meissl (Preparation for the numerical evaluation of second order Molodensky-type formulas. Ohio State University, Department of Geodetic Science and Surveying, Rep 163, 1971) modified kernel for better combination of the different wavelengths of the earth’s gravity field. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000133419
Veröffentlicht am 31.05.2021
Originalveröffentlichung
DOI: 10.1007/1345_2020_122
Dimensions
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Geodätisches Institut (GIK)
Publikationstyp Buchaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator KITopen-ID: 1000133419
Erschienen in International Association of Geodesy Symposia
Verlag Springer Verlag
Seiten 1-11
Vorab online veröffentlicht am 29.09.2020
Schlagwörter Africa, Geoid determination, Gravity field, Gravity interpolation, Window technique
Nachgewiesen in Dimensions
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