Laplacian Closures Between the Astronomical Azimuths, the Bases Measured to Revalue the Tunisian Primordial Terrestrial Geodetic Network

As part of the Tunisian Geodesy Upgrade project, we present in this report an investigation of the quality of our Tunisian Primordial Terrestrial Geodetic Network (RGPTT). On this subject, we present the study of Laplacian closures between the eight astronomical azimuths as well as the agreements between bases measured in 1982 during work to revalue the RGPTT object of agreement n°2916 between the OTC and the Institut Geographique National de France (IGNF). We give in part A the methodology followed, the results obtained and the conclusions. The part B of the investigation concerned the different calculations, is given in the full paper.