Qualification and refinement of the gravity database based on cross-validation approach — A case study of Iran

Kiamehr, R. (2007) Qualification and refinement of the gravity database based on cross-validation approach — A case study of Iran. Acta Geodaetica et Geophysica Hungarica, 42 (3). pp. 285-295. ISSN 1217-8977

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Abstract

In this article, we propose a technique for the precise cleaning of the gravity anomaly database based on the cross validation approach. The terrestrial gravity anomalies were compared versus a global geopotential model and take into account the effect of topography in this comparison. The efficiency of the cross-validation technique is illustrated in outlier detection as well as in choosing the proper gridding technique as a case study in construction of the Iranian new gravity database. In order to reduce the effect of topography and the discretisation error, a special interpolation scheme is used for gridding of the free-air gravity anomalies. The final grid file was created based on the Kriging method with 80″ × 90″ block resolution. The overall accuracy for the new Iranian gravity database is estimated in the order of 10 mGal.

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