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Global gravity models and the Ghanaian Vertical Datum: challenges of a proper definition
Survey Review ( IF 1.6 ) Pub Date : 2019-11-03 , DOI: 10.1080/00396265.2019.1684006
C. I. Kelly 1 , S. A. Andam-Akorful 2 , C. M. Hancock 1 , P. B. Laari 3 , J. Ayer 2
Affiliation  

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  m 2  s 2 , suggested as the potential of the GhVD.



中文翻译:

全球重力模型和加纳垂直基准:正确定义的挑战

本文分析了与定义加纳垂直基准面(GhVD)有关的卫星重力和GPS /三角基准(BMs)的误差。结果表明,合成重力将大约5 mm的误差引入校正后的高度。但是,BM中的大错误使它们不适合应用程序,包括正确定义GhVD。总体而言,法线矫正约为数毫米,而赫尔默特法线矫正和法向矫正相对较大。因此,最适合GhVD的高度是法线正高,具有赫尔默特正高的地势, 62636861.534 ± 2.27  米 2  s - 2 ,建议作为GhVD的潜力。

更新日期:2019-11-03
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