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