suletud joon uuritaval pinnal (maapinnal), mille punktide koordinaadid leitakse arvutuslikult lähtuvalt etteantud helitasemest või muust müra hinnangukriteeriumist
Details of noise contours for the current and previous years - including an assessment of the number of people affected by aircraft noise. Description of the computational method used to develop the contours.
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