Figure 4. Case study involving the area around Washington Square Park: (a) Distribution of 311 outdoor noise complaints in the focus area during the study period; the bar graph shows clear predominance of after-hours construction noise. (b) Distribution of complaint resolution for after-hours construction complaints; almost all complaints result in “violation not observed” status. (c) Sensor data for the after-hours period corresponding to six complaints: continuous SPL data (blue), background level (green), event-detection threshold at 10dB above background level (black), and potential noise code violation events (red).

(a) Complaint type
(b) After-hours construction
complaint resolution
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Figure 3. (left) Interactive 3D visualization of a New York neighborhood using Urbane. By selecting specific sensors (red pins) and buildings (purple) researchers can retrieve and visualize multiple data streams associated with these locations. (right) SPL data at various resolutions and time scales retrieved using the time lattice. Each sub-figure reflects different individual (gray) and aggregated (red) sensor data for the three sensor units highlighted in the left plot.