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Contribution of GPS-GNSS technology to the determination of altimetric measurements: Case of the Commune of Abomey-Calavi, Benin

Author Affiliations

  • 1Engineer in Geodesy, Department of Civil Engineering of the Polytechnic School of Abomey-Calavi, University of Abomey-Calavi, Benin
  • 2Design Engineer, Geometer-Topographer, Ecole Polytechniqued\' Abomey-Calavi, University of Abomey-Calavi, Benin

Res. J. Recent Sci., Volume 9, Issue (2), Pages 27-38, April,2 (2020)


The altimetric requirements for projects with a strong vertical component are numerous and urgent. These needs can not be properly realized without the control of both this vertical component and the instruments used for its determination. The present study proposes to answer the fundamental question of how to achieve a leveling of an acceptable precision in accordance with the aspirations of the specifications using conventional tools and a GPS receiver. The results obtained point out that the accuracy of the altimetric data depends on the type of apparatus used and this in a good state of operation. Similarly, the results show that it is the technical tolerance and accuracy of the altimetry meters that lead to the choice of equipment and procedure to respond promptly to the Terms of Reference (TOR) in the execution of an altimetric survey operation. Finally, the same results showed us that for a precision leveling, are highly recommended for the impressive quality of accuracy they present, the SL10 digital level, the GPS-CHC and the engineering level. As for the total station and the Trimble R7-R8 GPS they are recommended under the best conditions of their use for ordinary leveling. In the case of this study, a model test was determined by the geometric leveling and GPS positioning method, which consisted of directly exploiting the ripple of the study area.


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