Modelling of Orthometric heights from Multi-Networks of GNSS/Precise Levelling in FCT, Abuja

Author: Oluyori P. D., Ono M. N., Eteje S. O.

ijeab doi crossref DOI: 10.22161/ijeab.4443

Keyword: Geoid undulation, Multiquadratic, Bicubic, Grashof’s law, Orthometric height.

Abstract: The geoid is used as a transformation linkage between ellipsoidal heights (h) determined from DGPS observations and orthometric heights (H). Widespread acceptability and adoption of GPS in local geospatial data acquisitions require the development of a local geoid model (N) for use to obtain orthometric heights in the absence of a national geoid model. Geoid model can be developed by gravimetric approach; global geopotential model (GGM); geometric technique among others. The conventional approach to GPS measurements is the use of one base reference station for field measurements. It has several drawbacks e.g. in signal range/coverage, accuracy degradation of results, etc. Based on Grashof's law of stability of triangles, this study was therefore based on dual reference base stations to improve on DGPS signal range and stability of results. Pro-online matrix solver was applied to the least squares observation equations of the two modelled FCT surfaces (multi - quadratic and bicubic) to determine polynomial coefficients. The geoid undulation was computed and orthometric height generated for production of a topographical plan at 1m contour interval for elevation data in surveying, engineering and environmental applications. Skill =1 and bias = 0 were computed to confirm the predictive capability of the models and that no bias/errors were introduced into the respective modelling exercise. Diagnostic test also confirmed the viability and feasibility of providing vertical datum surface for FCT by this approach. Standard deviation (σ) as accuracy indicator was computed and the multi-quadratic model with σ =11cm was the better geoid surface for modelling of orthometric height in the FCT by the geometric method.

Total View: 1489 Downloads: 698 Page No: 1173-1180


Cite this Article:

MLA

Oluyori P. D., Ono M. N., Eteje S. O. et al."Modelling of Orthometric heights from Multi-Networks of GNSS/Precise Levelling in FCT, Abuja". International Journal of Environment Agriculture and Biotechnology(ISSN: 2456-1878),vol 4, no. 4, 2019, pp.1173-1180 AI Publications doi:10.22161/ijeab.4443

APA

Oluyori P. D., Ono M. N., Eteje S. O., P.(2019).Modelling of Orthometric heights from Multi-Networks of GNSS/Precise Levelling in FCT, Abuja. International Journal of Environment Agriculture and Biotechnology(ISSN: 2456-1878).4(4), 1173-1180.10.22161/ijeab.4443

Chicago

Oluyori P. D., Ono M. N., Eteje S. O., P.(2019).Modelling of Orthometric heights from Multi-Networks of GNSS/Precise Levelling in FCT, Abuja. International Journal of Environment Agriculture and Biotechnology(ISSN: 2456-1878).4(4), pp.1173-1180.

Harvard

Oluyori P. D., Ono M. N., Eteje S. O.. 2019."Modelling of Orthometric heights from Multi-Networks of GNSS/Precise Levelling in FCT, Abuja". International Journal of Environment Agriculture and Biotechnology(ISSN: 2456-1878).4(4):1173-1180.Doi:10.22161/ijeab.4443

IEEE

Oluyori P. D., Ono M. N., Eteje S. O.."Modelling of Orthometric heights from Multi-Networks of GNSS/Precise Levelling in FCT, Abuja", International Journal of Environment Agriculture and Biotechnology,vol.4,no. 4, pp.1173-1180,2019.

Bibtex

@article { oluyorip.d.2019modelling,
title={Modelling of Orthometric heights from Multi-Networks of GNSS/Precise Levelling in FCT, Abuja},
author={Oluyori P. D., Ono M. N., Eteje S. O. , R},
journal={International Journal of Environment Agriculture and Biotechnology},
volume={4},
year= {2019} ,
}