Global gravity models and the Ghanaian Vertical Datum: challenges of a proper definition

C. I. Kelly, S. A. Andam-Akorful, C. M. Hancock, P. B. Laari, J. Ayer

Research output: Journal PublicationArticlepeer-review

3 Citations (Scopus)

Abstract

This paper analyzes errors in satellite gravity and GPS/trigonometric benchmarks (BMs) in relation to defining the Ghanaian Vertical Datum (GhVD). Results indicate that synthesized gravity introduce approximately 5 mm of error to corrected heights. However, large errors in BMs render them unsuitable for applications, including properly defining the GhVD. Overall, normal-orthometric corrections were of the order of a few millimetres, with comparatively larger Helmert orthometric and normal corrections. Accordingly, the most suitable heights for the GhVD are the normal-orthometric heights, with the geopotential of the Helmert orthometric heights, 62636861.534±2.27 m2 s−2, suggested as the potential of the GhVD.
Original languageEnglish
Pages (from-to)44-54
JournalSurvey Review
Volume53
Issue number376
DOIs
Publication statusPublished - 2 Jan 2021

Keywords

  • Height system unification
  • Ghanaian Vertical Datum
  • Geopotential
  • Vertical datum

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