Practical Local Geoid Model Determination for Mean Sea Level Heights of Surveys and Stable Building Projects

Okiemute, Eteje Sylvester; Ono, Matthew Nnonyelu; Oduyebo, Olujimi Fatai

Practical Local Geoid Model Determination for Mean Sea Level Heights of Surveys and Stable Building Projects

Eteje, S. O., Ono, M. N. And Oduyebo, O. F. (2018): Practical Local Geoid Model Determination for Mean Sea Level Heights of Surveys and Stable Building Projects. IOSR Journal of Environmental Science, Toxicology and Food Technology (IOSR-JESTFT), Vol. 12, No. 6, pp 30-37.

8 Pages Posted: 11 Jan 2019

See all articles by Eteje Sylvester Okiemute

Eteje Sylvester Okiemute

Eteje Surveys and Associates, Benin City, Edo State, Nigeria.

Matthew Nnonyelu Ono

Nnamdi Azikiwe University

Olujimi Fatai Oduyebo

Nnamdi Azikiwe University, Faculty of Environmental Sciences, Department of Surveying and Geoinformatics, Students

Date Written: June 6, 2018

Abstract

A local geoid model for Evboriaria, Benin City using the geometric (GPS/Levelling) method was determined for calculation of mean sea level heights. Fifty points were established for the model and ten points were used for interpolation. The geoid heights were determined by finding the difference between the observed orthometric heights and the ellipsoidal heights. The polynomial regression model D was used for the interpolation of the orthometric heights. The computed mean standard deviation between the observed orthometric heights and the interpolated orthometric heights was ± 21cm. A mean geoidal undulation of 28.410m was computed using the gravimetric method. The computed orthometric heights using the gravimetry mean geoidal undulation were compared with the observed orthometric heights and seen to be identical. It is recommended that orthometric heights of project areas should be determined from GPS observations with the local geoid model of the area also determined.

Keywords: Geoid Model, Ellipsoidal Height, Orthometric Heights, Geoid Undulation, GPS

Suggested Citation: Suggested Citation

Okiemute, Eteje Sylvester and Ono, Matthew Nnonyelu and Oduyebo, Olujimi Fatai, Practical Local Geoid Model Determination for Mean Sea Level Heights of Surveys and Stable Building Projects (June 6, 2018). Eteje, S. O., Ono, M. N. And Oduyebo, O. F. (2018): Practical Local Geoid Model Determination for Mean Sea Level Heights of Surveys and Stable Building Projects. IOSR Journal of Environmental Science, Toxicology and Food Technology (IOSR-JESTFT), Vol. 12, No. 6, pp 30-37., Available at SSRN: https://ssrn.com/abstract=3308455