Geosensor networks and sensor webs are two technologies widely used for determining our exposure to pollution levels and\nensuring that this information is publicly available. However, most of these networks are independent from each other and often\ndesigned for specific domains, hindering the integration of sensor data from different sources. We contributed to the integration\nof several environmental sensor networks in the context of the IDEA project. The objective of this project was to measure noise\nand air quality pollution levels in urban areas in Belgium using low-cost sensors. This paper presents the IDEA Environmental\nMeasurement Cloud as a proof-of-conceptData-as-a-Service (DaaS) cloud platformthat integrates environmental sensor networks\nwith a sensor web. Our DaaS platform implements a federated two-layer architecture to loosely couple together sensor networks\ndeployed over a wide geographical area with web services. It offers several data access, discovery, and visualization services to the\npublic while serving as a scientific tool for noise pollution research. After one year of operation, it hosts approximately 6.5 TB of\nenvironmental data and offers to the public near real-time noise pollution measurements from over 40 locations in Belgium.
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