A cluster analysis was applied to the standardized data by using the 63 Hz and 125 1/3 octave band as variables to visualize which recording locations are more similar in the Trieste Gulf.
Standardized values per single station have been calculated as (x − min)/(max − min) with x being the average noise level recorded at the station and min and max being the minimum and maximum average noise levels recorded along all the monitored stations, respectively.
The cluster groups were calculated by using the Ward's method and they were based on Euclidean distanc