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Detection of Outliers in Pollutant Emissions from the Soto de Ribera Coal-Fired Plant Using Functional Data Analysis: A Case Study in Northern Spain

1
Department of Mathematics, University of Oviedo, 33007 Oviedo, Spain
2
Department of Prospection and Mining Exploitation, University of Oviedo, 3004 Oviedo, Spain
*
Author to whom correspondence should be addressed.
Presented at the 2nd International Research Conference on Sustainable Energy, Engineering, Materials and Environment (IRCSEEME), Mieres, Spain, 25–27 July 2018.
Proceedings 2018, 2(23), 1473; https://doi.org/10.3390/proceedings2231473
Published: 5 November 2018
The present research uses two different functional data analysis methods called functional high-density region (HDR) boxplot and functional bagplot. Both methodologies were applied for the outlier detection in the time pollutant emissions curves that were built using as inputs the discrete information available from an air quality monitoring data record station. Although the record of pollutant emissions is made in a discrete way, these methodologies consider pollutant emissions over time as curves, with outliers obtained by a comparison of curves instead of vectors. Then the concept of outlier passes from been a point to a curve that employed the functional depth as the indicator of curve distances. In this study, the referred methodologies are applied to the detection of outliers in pollutant emissions from the Soto de Ribera coal-fired plant which is in the nearby of the city of Oviedo, located in the Principality of Asturias, Spain. Finally, the advantages of the functional method are reported.
Keywords: functional data analysis; outlier detection; air pollution; gas emissions; functional bagplot; functional high-density region (HDR) boxplot functional data analysis; outlier detection; air pollution; gas emissions; functional bagplot; functional high-density region (HDR) boxplot
MDPI and ACS Style

Lasheras, F.S.; Galán, C.O.; Nieto, P.J.G.; García-Gonzalo, E. Detection of Outliers in Pollutant Emissions from the Soto de Ribera Coal-Fired Plant Using Functional Data Analysis: A Case Study in Northern Spain. Proceedings 2018, 2, 1473.

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