## 1 Introduction  
During geodetic services, especially by using multi-sensor systems, numerous factors can affect the final surveying accuracy and limit their appropriate implementation. The error sources existing in practice may relate to external conditions, instrumental errors, as well as personal imperfections [1]. Such influence can be largely eliminated by utilizing forced instrument centering or introducing special instrumental modules--e.g., automatic target recognition (ATR) or servo motors enabling robotic measurement [2]. Instrumental errors should be regularly determined, and the instrument itself should be subjected to periodic service inspections. An important problem is an impact of external conditions on the measurement result--both atmospheric and weather, as well as other factors such as dust, vibration, or the presence of heat sources (machines and industrial installations). This is particularly important in geodetic deformation monitoring systems [3]--both industrial and natural facilities [4; 5]. The need to ensure not only highly accurate but also reliable measurements performed by using total stations is particularly evident in the case of large areas subject to monitoring, e.g., in high mountains [6; 7]. The cited authors analyzed data on monitoring the glacier valley in the Swiss Alps using robotic total stations. The emerging problems here concern both long targets, often exceeding 1 km, as well as the impact on the results of measuring changing weather conditions. Moreover, an important role is played by, in this case, refraction--particularly vertical temperature and humidity gradient related to significant height differences between individual control points. In addition, a significant obstacle in the case of utilizing geodetic instruments on similar objects is the ambiguity of identifying the correct reference system. The solution to this problem may be employing an appropriate instrumental system [8] or a computational strategy [9; 10]. The issue was also presented and thoroughly analyzed in the publication [11]. The authors reported and summarized many years of measurement works in the form of a reliable case study of geometric changes in the glacier in Antarctica. When conducting geodetic monitoring, the aspect of securing and ensuring the stability of the measuring station is particularly important. The solutions existing on the market utilize various types of protection shelters--from glazed (entirely closed) or completely open containers and covers, to smaller housings with holes through which the appropriate telescope aiming is ensured (as exampled in Figure 1). For example, articles [12; 13] demonstrate a classic measuring container used--in this case--to monitor geometric movements in landslides. However, such installations are not entirely optimal, e.g., in tunnel projects [14] or on regular construction sites, especially in cities. In such cases, the already mentioned, smaller structures are established [15; 16]. Until now, such protections were performed in a non-standard manner, and the new forms obtained were rarely subjected to comprehensive research and functional assessments [17]. This time, the authors presented multi-variant functional analyses regarding the selection of the optimal measuring standpoint of a robotic total station for structural monitoring purposes. They proved that using fully glazed protective shelters for instruments retrieves no satisfactory results. Furthermore, a significant dispersion of recorded data is then obtained, which significantly reduces the measurement reliability. The solution is to enable an uninterrupted course of the line-of-sight axis of the total station telescope. It should be added that both the acrylic and classic glass covers can contribute to many errors. They also significantly impede the proper operation of the ATR module.