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Comparative study and determination of transformation parameters between: the permanent station system, the datum (58) and the Benin geodetic system

Author Affiliations

  • 1Engineer in Geodesy, Department of Civil Engineering of the Polytechnic School of Abomey-Calavi, Benin
  • 2Geometry Engineer, Research Master in Geomatics and Environment, University of Abomey Calavi, Benin

Res. J. Recent Sci., Volume 8, Issue (4), Pages 1-8, October,2 (2019)


Topographic work in BENIN has been carried out in three different systems. The first works that were carried out before 1980 are in the Datum system (58), the second ones that were developed in the mid-90s are in the Geodetic System of Benin (SGB) and the last ones that date from 2010 are calibrated in the called Permanent Stations System (RSPB). The problem for geomatics players is to find a bridge to bring back the old works in the last system, since the system of permanent stations will now be the only system of our works according to the decree N ° 0068 / MUHRFLEC / DC / SGM / lGN / DGURF / SA of 28 December 2009. Indeed, two alternatives arise: The resumption of observations on the ground for all the old works, which is very tedious and expensive when it is possible. This alternative is only possible if the physical terminals or points actually exist, this is not the case for the first BENIN cards for which the terminals were destroyed. The second is the elaboration from the very precise GNSS observations on the entire national territory of the calculation of the transformation parameters from the BURSA - WOLF formula. We directed our research on the determination of these parameters after observing a total of 18 first-order geodesic terminals in the system of permanent stations whose coordinates were known in the Datum 58 system and the BENIN Geodetic Network. The calculation of the parameters for each system made it possible to verify the quality of our work by calculating the coordinates of certain terminals from the seven (07) parameters. The transformed coordinates were compared with those obtained by observations. An Excel application has been developed for ease of use. We have come to the conclusion, that the research must continue, to reach centimeter precision, but the results obtained are satisfactory to solve the problem of land insecurity due to a pluralism of system, because now instead of a gap of 170m between different systems, we have reached a precision of less than 1m.


  1. Eissa L. (2011)., Use of astrogeodetic and spatial geodesy methods for studies of deformation of the Earth, Research Laboratory in Geodesy / National School of Geographical Sciences (LAREG / ENSG), Ph.D. Thesis, 196.
  2. Durand S. (2003)., Improvement of the accuracy of the real-time differential localization by phase measurement of GNSS systems., Research Laboratory in Geodesy, PhD Thesis, 249.
  3. Nathalie D. (1984)., Contribution of space techniques to the knowledge of surface currents; application to the Antarctic Ocean., University of Western Brittany, PhD Thesis, 120.
  4. Ministry of Urbanism (2009)., Order fixing the standards and technical specifications applicable to topographic and cartographic work in the Republic of Benin., 19.
  5. Andres L. (2003)., Transformation in the RGF93 system of the geographical database of the city of Nice., 10.
  6. Altamimi Z. (2006)., Terrestrial reference systems: definition, realization, application to the ITRF, current state and perspectives., Pierre and Marie-Curie University, 71.
  7. Pierre B. (2009)., Introduction to Geodesy and Geo-positioning by Satellites (GPS)., Course Material, 40.
  8. Abdelmajid B.H.S. (2011)., The BURSA-WORLF model., 6. (Accessed 2017-02-15).
  9. Lannuzel S. (2000)., Geodetic and Coordinate References., EPSHOM Geodesy and Geophysics Center, 56.
  10. Abdelmajid B.H.S. (1995)., Elements of Geodesy and Least Squares Theory., 391.
  11. Jozeau M.F. (1997)., Geodesy in the nineteenth century: From French hegemony to German hegemony., Belgian look; Compensation and Least Squares, \"HAL\" Open Archives, 646. (Accessed 2017-02-15)