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Title: Data analytics for smart parking applications
Author: Piovesan, Nicola
Turi, Leo
Toigo, Enrico
Martínez Huerta, Borja  
Rossi, Michele
Keywords: data analytics
smart parking data
wireless sensing
self-organizing maps
data clustering
Internet of things
Issue Date: 23-Sep-2016
Publisher: Sensors
Citation: Piovesan, N., Turi, L., Toigo, E., Martínez Huerta, B. & Rossi, M. (2016). "Data analytics for smart parking applications". Sensors, 16(10). ISSN 1424-8220. doi: 10.3390/s16101575
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Abstract: We consider real-life smart parking systems where parking lot occupancy data are collected from field sensor devices and sent to backend servers for further processing and usage for applications. Our objective is to make these data useful to end users, such as parking managers, and, ultimately, to citizens. To this end, we concoct and validate an automated classification algorithm having two objectives: (1) outlier detection: to detect sensors with anomalous behavioral patterns, i.e., outliers; and (2) clustering: to group the parking sensors exhibiting similar patterns into distinct clusters. We first analyze the statistics of real parking data, obtaining suitable simulation models for parking traces. We then consider a simple classification algorithm based on the empirical complementary distribution function of occupancy times and show its limitations. Hence, we design a more sophisticated algorithm exploiting unsupervised learning techniques (self-organizing maps). These are tuned following a supervised approach using our trace generator and are compared against other clustering schemes, namely expectation maximization, k-means clustering and DBSCAN, considering six months of data from a real sensor deployment. Our approach is found to be superior in terms of classification accuracy, while also being capable of identifying all of the outliers in the dataset.
Language: English
ISSN: 1424-8220MIAR
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