## 1 Introduction  
Engineering geodesy is an essential part of construction projects, as it provides the necessary support in all phases of construction projects, from design to construction to recording of built facilities and infrastructure. The basic element of geodesy is the acquisition of spatial data of the earth's surface and objects with the help of various geodetic measurement techniques and instruments. The applicability of non-contact methods for determining displacements and deformations is described in [1; 2; 3; 4; 5]. In addition, the analysis of various geodetic methods is carried out to determine displacements and their applicability and suitability for detecting displacements of smaller values. Among the described methods, the RTS method is in the forefront, which allows for automatic tracking of the target in motion and a sufficient number of measurements per second. Our work focused on the applicability of the terrestrial laser scanning (TLS) method, which has not been previously used for this type of research. We also compared the results with the applicability of the robotic total station (RTS) with other measurement tools and methods. The comparison of the experimental results with RTS show the high accuracy of the TLS measurements. When automatically tracking a measurement point, a parameter \"numberof measurements per second\" is always defined, which can also be used to define dynamic parameters. Moreover, the tables show the results of other methods used. The experiment was performed on nine test specimens, three for each experiment, which corresponded to the [6] standards for testing timber beams. Calculations of deformations of timber beams were performed by SCIeng analysis, in order to compare the obtained results. For many years, manual calculations were used to determine the statics of the structure, which required a good knowledge of the structure and the loads. When calculating the statics of a structure, we have to take into account all the additional parameters, such as moisture content of the material, density of the test specimen, weight and mass of the load, etc., which is a very demanding procedure when calculating the statics manually. Currently, at least in the field of engineering, the computer calculation of statics is a much simpler and reliable calculation procedure. In the procedure itself, with the help of programs, parameters can be entered, the load can be changed at will, and displacements can be simulated depending on the position of the load. The computer programs also allow us to better present the results in 3D or 4D technology. Due to the constant development of computer technologies, the requirements for the representation of spatial data have changed. This allows users to improve the integrity of their spatial perception and, above all, to find spatial solutions at a higher level of quality. On the desire for efficient and fast measurements, the technology of TLS and RTS is becoming more and more useful for engineers. The first 3D scanning technology was developed in the 1980s. The basic idea was to create as accurate a model as possible of the surface of various objects and buildings. The technology and use of 3D laser scanning took off in the 1990s when the scanners not only became more affordable but also became more accurate, faster, and able to realistically capture the environment [7]. The authors of [8] compared different methods for measuring the volume and deformations of a sand embankment. When using the TLS technology, they emphasized the high measurement accuracy and the simplicity and speed of field work. Focusing on the use of TLS to determine the deformation of structures, we note that a number of researchers have conducted similar studies Due to the mentioned advantages, the method may be suitable for monitoring deformations and displacements of structural elements. The authors of [9] determined the deformations and described the computational processing in the case of an arch beam loading.