Accuracy of the Dynamic Acoustic Map in a Large City Generated by Fixed Monitoring Units

DYNAMAP, a European Life project, aims at giving a real image of the noise generated by vehicular traffic in urban areas developing a dynamic acoustic map based on a limited number of low-cost permanent noise monitoring stations. The system has been implemented in two pilot areas located in the aggl...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2020-01, Vol.20 (2), p.412
Main Authors: Benocci, Roberto, Confalonieri, Chiara, Roman, Hector Eduardo, Angelini, Fabio, Zambon, Giovanni
Format: Article
Language:English
Subjects:
Acceptable noise levels
Accuracy
Acoustic mapping
Acoustics
Algorithms
Cluster analysis
dynamap project
Error correction
Mapping
Model accuracy
Noise
Noise levels
noise mapping
noise mitigation
Noise monitoring
Noise prediction
Reliability analysis
Roads & highways
Sensors
Statistical analysis
Suburban areas
Time series
Traffic flow
Traffic models
Transportation networks
Urban areas
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Summary:DYNAMAP, a European Life project, aims at giving a real image of the noise generated by vehicular traffic in urban areas developing a dynamic acoustic map based on a limited number of low-cost permanent noise monitoring stations. The system has been implemented in two pilot areas located in the agglomeration of Milan (Italy) and along the Motorway A90 (Rome-Italy). The paper reports the final assessment of the system installed in the pilot area of Milan. Traffic noise data collected by the monitoring stations, each one representative of a number of roads (groups) sharing similar characteristics (e.g., daily traffic flow), are used to build-up a "real-time" noise map. In particular, we focused on the results of the testing campaign (21 sites distributed over the pilot area and 24 h duration of each recording). It allowed evaluating the accuracy and reliability of the system by comparing the predicted noise level of DYNAMAP with field measurements in randomly selected sites. To this end, a statistical analysis has been implemented to determine the error associated with such prediction, and to optimize the system by developing a correction procedure aimed at keeping the error below some acceptable threshold. The steps and the results of this procedure are given in detail. It is shown that it is possible to describe a complex road network on the basis of a statistical approach, complemented by empirical data, within a threshold of 3 dB provided that the traffic flow model achieves a comparable accuracy within each single groups of roads in the network.
ISSN:1424-8220
1424-8220
DOI:10.3390/s20020412