Practical Local Geoid Modelling of Benin City, Nigeria from Gravimetric Observations Using the Modified Stokes Integral

Oduyebo, Olujimi Fatai; Ono, Matthew Nnonyelu; Eteje, S. O.

doi:10.22161/ijaems.512.1

Cited by 2 publications

(2 citation statements)

References 10 publications

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“…When plotting the finished ground profiles, suitable gradients and curve lengths were chosen and used to compute their parameters. The parameters used for the plotting of the vertical curves were computed with equation (10) while the high and low points on the curves were respectively computed using equations (1.11) and (1.12). Fig.…”

Section: Methodsmentioning

confidence: 99%

“…A topographic survey usually entails perimeter survey, spot height survey and detailing [8,9] to produce a perimeter plan, vector, spot heights, and contour maps of the site, which in turn, used to determine suitable gradients to ensure proper vertical alignments of the proposed constructions, and the determination of the volume of earthworks and draining of the site. [10]. Figs 3 and 4 show the maps of the study area.…”

Section: Fig 2 Size Perimeter Shape and Orientation Of The Consultant Site Planmentioning

confidence: 99%

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Determination of the Topography and Draining of the Site for the Benin City Bus Rapid Transit (BRT) Station

Eteje¹,

Cyril²

2021

AJARR

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The reconciliation of engineering designs that do not have survey information, that involve accurate configuration of the proposed constructions at their respective locations on-site requires first a topographic survey to obtain the perimeter survey plan, which in turn, shows the area, shape, perimeter and orientation of the site; spot heights plan showing the existing ground levels thereby used to decide on suitable gradients and determine appropriate finished ground surface, coordinates of the turning points of outlines of the proposed constructions and their respective elevations. For that reason, this study determines the topography and drains the site for the Benin City Bus Rapid Transit (BRT) station in Oredo Local Government Area of Edo State. A topographic survey was carried out to produce topographic plans. The accuracy of the survey was computed to determine its reliability. The perimeter survey plan was plotted using AutoCAD Civil 3D Land Desktop Companion 2009 to present the area, shape, perimeter and orientation of the site. The TIN method was used for the computation of the volume of earthworks. The existing and the finished ground surfaces, vector, as well as the flow direction plans, contour plans and the 3D surface maps were plotted using Surfer 11 to show graphically the existing and the proposed topography of the site. A network of drainages was established to drain the site. The study has shown that the site can be drained in two ways, into the moat behind it and existing drainage along Obakhavbaye.

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Section: Methodsmentioning

confidence: 99%

Section: Fig 2 Size Perimeter Shape and Orientation Of The Consultant Site Planmentioning

confidence: 99%

Determination of the Topography and Draining of the Site for the Benin City Bus Rapid Transit (BRT) Station

Eteje¹,

Cyril²

2021

AJARR

Self Cite

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Determination of Orthometric Heights of Points Using Gravimetric/GPS and Geodetic Levelling Approaches

Herbert

Eteje

2022

International Journal of Environment and Geoinformatics

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The importance of practical, as well as orthometric heights in engineering cannot be underestimated as it is required for the determination of proposed construction levels and to direct the flow of water. This study presents the determination of orthometric heights of points using gravimetric/GPS and geodetic levelling approaches and compares the resolution of the two approaches to determine which of the methods is better for orthometric height determination in the study area. A total of 59 stations were occupy for gravity observation using Lacoste and Romberg (G-512 series) gravimeter to obtain the absolute gravity values of the points. GNSS observation was carried out in static mode using South GNSS receivers to obtain the positions and ellipsoidal heights of the points. The modified Stokes' integral was applied to obtain the geoid heights of the points. Similarly, levelling was carried out using the geodetic level to obtain the level heights of the points. The orthometric correction was applied to the geodetic levelling results to obtain precise level heights of the points. The RMSE index was applied to compute the accuracy of the geoid models. The computed result shows that orthometric heights can be obtained in the study area using the two models with an accuracy of 0.3536m. Z-test was carried out to determine if there is any significant difference between the two methods. The test results show that statistically, there is no significant difference between the two methods. Hence, the two methods can be applied for orthometric heights determination in the study area.

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Practical Local Geoid Modelling of Benin City, Nigeria from Gravimetric Observations Using the Modified Stokes Integral

Cited by 2 publications

References 10 publications

Determination of the Topography and Draining of the Site for the Benin City Bus Rapid Transit (BRT) Station

Determination of the Topography and Draining of the Site for the Benin City Bus Rapid Transit (BRT) Station

Determination of Orthometric Heights of Points Using Gravimetric/GPS and Geodetic Levelling Approaches

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