GEODETIC MEASUREMENT TECHNIQUES FOR 3D SURVEYING OF SURFACES AND BUILT STRUCTURES - INSTRUMENTAL CALIBRATION

In the 3D geodetic survey of surfaces and built structures, the terrestrial measurement instruments typically used are digital levels and total stations. Before collecting field data, particularly for projects aiming at precise results, it is essential to ensure that the measuring instruments are inspected, adjusted, if necessary, classified, and calibrated procedures that are crucial for guaranteeing the accuracy of field measurements. Thus, to ensure the accuracy of the instrument used before field operations began, the Kukkamaeki method was applied to check collimation error, and both the simplified and complete methods of ISO standard 17123-2 (2001) were used to assess the precision of the digital level. It was not necessary to adjust the digital level since both the collimation error value (c) and the equipment's precision were within the specifications required by the methods and standards. Similarly, the horizontal and vertical circles of the total station were verified using the direction method with the AstGeoTop software, and the angular uncertainty achieved complied with NBR 13133 (2021), classified as average angular precision. For future work, it is recommended to automate the robotic total station for prism search and collimation at the observed points.