AFRGDB_V2.0: The Gravity Database for the Geoid Determination in Africa

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

doi:10.1007/1345_2018_29

Cited by 9 publications

(6 citation statements)

References 7 publications

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“…In this section the gravity data sets available for the gravity and geoid in Africa are described. Additional details can be found in [11]. There are three types of gravity data, namely such on land, shipborne, and altimetry derived gravity anomalies.…”

Section: The Used Datamentioning

confidence: 99%

“…In this paper the RTM smoothed data are used employing the weighted least-squares prediction technique [17] in order to compile the new gravity database AFRGDB_V2.3. It is evaluated against the previous version AFRGDB_V2.0 [11], which was established using the laborious but unambiguous window remove-restore technique with the same input point data.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, in the restore step, the gravity anomalies are completed by the shortwavelength parts and residual field components in the grid points. The new gravity data base is thoroughly compared with the previous version AFRGDB_V2.0 [11] on the whole solution window (40…”

Section: Introductionmentioning

confidence: 99%

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AFRGDB V2.3: The Updated Gravity Database for Africa using RTM Technique

Abd-Elmotaal,

Seitz,

Kühtreiber

et al. 2024

Journal of Advanced Engineering Trends

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Section: The Used Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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AFRGDB V2.3: The Updated Gravity Database for Africa using RTM Technique

Abd-Elmotaal,

Seitz,

Kühtreiber

et al. 2024

Journal of Advanced Engineering Trends

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“…In order to achieve its main goal, the IAG Sub-Commission on the gravity and geoid in Africa has established a recent set of gravity databases. This set comprises the AFRGDB_V2.0 (Abd-Elmotaal et al 2018) and AFRGDB_V2.2 (Abd-Elmotaal et al 2020). The aim of this investigation is to perform an external validation of the above mentioned gravity databases employing a recently available gravity data set.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Recent African Gravity Databases V2.x

Abd-Elmotaal

Kühtreiber

Seitz

et al. 2023

International Association of Geodesy Symposia

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In the framework of the activities of the IAG Sub-Commission on the gravity and geoid in Africa, a recent set of gravity databases has been established. They are namely: AFRGDB_V2.0 and AFRGDB_V2.2. The AFRGDB_V2.0 has been created using the window remove-restore technique employing EGM2008 as geopotential Earth model complete to degree and order 1800. The AFRGDB_V2.2 has been established using the Residual Terrain Model (RTM) reduction technique employing GOCE DIR_R5 complete to degree and order 280, using the best RTM reference surface. The available gravity data set for Africa, used to establish the above mentioned two independently derived databases, consists of shipborne, altimetry derived gravity anomalies and of land point gravity data. In particular, the data set of point gravity values shows clear deficits with regard to a homogeneous data coverage over the completely African continent. The establishment of the gravity databases has been carried-out using the weighted least-squares prediction technique, in which the point gravity data on land has got the highest precision, while the shipborne and altimetry gravity data got a moderate precision. In this paper a new gravity data set on land and on sea, which became recently available for the IAG Sub-Commission on the gravity and geoid in Africa, located partly in the gap areas of the data set used for generating the gravity databases, has been employed to evaluate the accuracy of the previously created gravity databases. The results show reasonable accuracy of the established gravity databases considering the large data gaps in Africa.

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“…This corresponds to a spatial resolution of 5 arc-minutes (9 km at the equator) depending on the latitude. Nowadays, GGMs serve as good alternatives to create a synthesis of the Earth's gravity field, espe-cially in areas with no terrestrial gravimetric data or for which the data provide insufficient coverage, an observation made by Abd-Elmotaal et al (2018). Geodetic and geophysical studies of Cameroon have increasingly used terrestrial gravity field parameters calculated from the EGM2008 model (Ngatchou et al, 2014;Lordon et al, 2017Lordon et al, , 2018Kuisseu et al, 2018;Shandini et al, 2018).…”

Section: Introductionmentioning

confidence: 99%