## 1 Introduction
The applicability of the TLS scanner for monitoring infrastructure was investigated [10] in the case of a retaining wall [11], in the case of a bridge structure [12], in the case of a dam, and [13] in the case of a tunnel. A non-contact data acquisition technique is mainly used in areas where obtaining data by other methods is difficult. Using TLS in combination with other deformation methods makes a lot of sense because the methods complement each other. Each measuring device has its own characteristics, so the use of several methods is highly recommended. In particular, the determination of small displacements or displacements within the reliability limits of the equipment is recommended, as described in [14]. The authors used a laser tracker in addition to the TLS and used both methods to determine the displacement of a small structure. Similar research can also be found in [15; 16; 17; 18], where the authors describe the use and reliability of TLS to determine the deformation of structures. Additionally, in the last decade, a lot of attention has been paid to determining displacements using RTS. This method gives us very accurate results, and the advantages are shown in the automatic sighting, registration, and tracking of measurement targets. Methods of data acquisition by RTS techniques to determine static and dynamic responses have been described in works [19; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32]. Currently, TLS scanners are used for various purposes in the representation of the mutual relationships between objects and surroundings. They are also very suitable for BIM modelling of buildings and structures, for analysis of traffic accidents, and in architecture for reconstruction of buildings. In addition, they are used for various forms of monitoring, as described by the authors of [33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 50; 51; 52; 53; 54; 55; 56; 57; 58; 59; 60; 61; 62; 63; 64; 65; 66; 67; 68; 69]. In scan vs BIM methods for monitoring the progress of construction, the corresponding quality of the point cloud plays an important role, which has been studied in detail by the authors in [70]. The mentioned research confirmed the thesis that the use of TLS and RTS is suitable for performing measurements in hard-to-reach areas with an adequate number of stands and stabilization of support points for the point cloud georeferencing process. The Purpose of the ResearchThe research had two goals--namely, to determine the vertical displacements of timber beams using non-contact methods under different conditions and to determine the behavior of timber beams under load. For this purpose, we used the TLS method, and for the comparison of results we also used the RTS technology, which is one of the most geodetically reliable methods. Geodetic instruments for leveling and total station of lower accuracy were also used. To perform the experiment, we used the available measuring equipment that we have at the Faculty of the University of Maribor. In our case, TLS technology was exposed in the laboratory to additional lighting and additional reflection of rays from reflex surfaces, and the technology was exposed in the open to increased humidity due to additional humidification of the beams. With additional humidification, we wanted to determine how the increased humidity affected the load-bearing capacity, and thus we also increased the air humidity. As is known from the available literature, only a change in humidity has an additional effect on the results obtained with both TLS and RTS technology. To avoid mistakes, we placed both instruments at an ideal distance of less than 10 m and perpendicular to the brackets, which allowed us the optimal angle. To analyze the results, we used the results obtained with a TLS Leica RTC 360 LT and RTS Leica TS 50. As a second goal, we set out to investigate the static load-bearing capacity of timber beams of the same type, which were exposed to different meteorological conditions but the same load.