Building structures are extremely sensitive to the influence of outdoor conditions, especially the influence of wind, temperature changes in the surroundings caused by sunshine, and the effect of the building’s own or operating load. According to the resonance of the structure with the surroundings, vibrations and oscillations in relatively high frequency intervals (1–100.0 Hz) occur. These phenomena significantly affect the static and dynamic characteristics of structures as well as their safety and functionality. The paper provides an example of monitoring these phenomena using surveying methods and instrumentation. The monitored structure (a desorbing tower) has a cylindrical shape. The measurements were made by a total station with a measurement frequency ca 2 Hz. The main point of the paper is an analysis of the dynamic behaviour of the structure using different methods for the spectral analysis of a time series. The use of a fast Fourier Transform and a Lomb-Scargle periodogram is described, and the frequencies of the structure’s oscillation are calculated.Strukture zgrada iznimno su osjetljive na utjecaj vanjskih uvjeta, posebno na utjecaje vjetra, temperaturne promjene u okolini uzrokovane sunčevim zračenjem, a također i na utjecaj vlastitog ili operativnog opterećenja. Prema rezonanciji strukture s okolinom, javljaju se vibracije i oscilacije u relativno visokim frekvencijskim intervalima (1–100,0 Hz). Ta pojava znatno utječe na statičke i dinamičke karakteristike struktura, kao i na njihovu sigurnost i funkcionalnost. U radu se daje primjer praćenja tih pojava geodetskim metodama i instrumentima. Struktura koja se prati (desorpcijski toranj) ima cilindrični oblik. Mjerenja su provedena pomoću totalne stanice mjernom frekvencijom oko 2 Hz. Doprinos u radu je analiza dinamičkog ponašanja strukture upotrebom različitih metoda i spektralnih analiza vremenskog niza podataka. Opisana je upotreba brze Fourierove transformacije i Lomb-Scarglovog periodograma i izračunate frekvencije strukturnih oscilacija
