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" |
|
|
|
