Abstract
The AFRGDB_V1.0 gravity database has been generated in 2015 from a set of land, shipborne and altimetry-derived gravity anomalies. This gravity data set had significantly large gaps especially on land. Recently, a new gravity data set on land became available. Most of the points of the new data set are located on the large gaps of the data set used to establish the AFRGDB_V1.0 gravity database. This enables an external check of the AFRGDB_V1.0 gravity database at those new data points. An internal validation of the AFRGDB_V1.0 gravity database has been also carried out. The results show that the AFRGDB_V1.0 has an internal precision of about 9 mgal and external accuracy of about 16 mgal.
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Acknowledgements
This project was supported financially by the Science and Technology Fund (STDF), Egypt, Grant No. 7944. The authors would like to thank Dr. Sylvain Bonvalot, Director of the Bureau Gravimétrique International (BGI), for providing the new data set for Africa. The support by the International Association of Geodesy (IAG) and the International Union of Geodesy and Geophysics (IUGG) is kindly acknowledged. The authors would like to thank the editor of the current paper and two anonymous reviewers for their useful comments.
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Abd-Elmotaal, H.A., Seitz, K., Kühtreiber, N., Heck, B. (2017). Evaluation of the African Gravity Database AFRGDB_V1.0. In: Vergos, G., Pail, R., Barzaghi, R. (eds) International Symposium on Gravity, Geoid and Height Systems 2016. International Association of Geodesy Symposia, vol 148. Springer, Cham. https://doi.org/10.1007/1345_2017_16
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DOI: https://doi.org/10.1007/1345_2017_16
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