Especially in highly dense populated areas, like The Netherlands, environmental aspects are, and always have been, a major issue in the relationship between airports and their neighbours. To deal with these aspects, airport and governmental authorities must have adequate information. In the early eighties this information often was limited to the noise level registration for a small number of (fixed) monitoring positions only. To gain additional knowledge about the environmental aspects related to the still ongoing growth of air transport, airports realised more and more complex noise and flight track monitoring systems.
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