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Determination of Deflection of the Vertical Components: Implications on Terrestrial Geodetic Measurement
World Journal of Geomatics and Geosciences
| Vol 1, Issue 1
Table 5. Showing the result of thedeflection of the vertical as computed by different researchers at variouslocations within and outside Nigeria
| Researcher | Location | Method | No. of Common Point | Components of Deflection of the Vertical | |
| Basil and Hart, (2021) | Part of Rivers State | North/South (ξ) | East/West (ɳ) | ||
| GPS/Level | 0.0473"±0.0093" | - 0.0393"±0.0060" | |||
| EGM 2008 | 21 | 0.0204″ ±0.0008814″ | -0.0345″ ±0.0014″ | ||
| EGM 1996 | 21 | 0.0157″ ±0.000755″ | -0.0246” ±0.0012” | ||
| EGM 1984 | 21 | -0.0546″±0.0006014 | -0.0208″±0.0006014″ | ||
| Maduafor et al, (2019). | Imo State | GPS/Levelling | -0.0286″±5.5911e-005 | -0.0001″±0.0009278″ | |
| Odoyebo et al. (2016) | Ugbowo, Benin city | GPS/Levelling | 15 | -0.550″ ± 0.000001″ | -0.395″± 0.0000006″ |
| Ameh (2013). | Lobi, Makurdi | GPS/ Level | -3.18″±0.60" | -2.25"±0.43" | |
| Kantomah (2010) | ABU Zaria | GPS/Level | -0.04462″ | 0.0575856″ | |
| Tse and Baki | Hong Kong | GPS/Levelling | -7.3″±1.6″ | 5.3″±1.3″ | |
| Ayhan (2009) | Honya, Turkey | GPS/Levelling | 15 | -4.15″ ±0.61″ | 8.75″ ±0.69″ |
| Tomas (1989) | USA | GPS/Levelling | 5.2″ ± 0.10″ | -2.76 ± 0.14" | |
| Tomas (1989) | USA | Astrogeodetic | 5.19″ ± 0.5" | -2.58″ ± 0.5" | |