A feature extraction unsupervised neural network for an environmental data set

Authors:
Giuseppe Acciani;Ernesto Chiarantoni;Girolamo Fornarelli;Silvano Vergura
Affiliations:
Department of Electrotecnology and Electronic, Politecnico di Bari--Itlay, Via E. Orabona 4, Bari 70125, Italy;Department of Electrotecnology and Electronic, Politecnico di Bari--Itlay, Via E. Orabona 4, Bari 70125, Italy;Department of Electrotecnology and Electronic, Politecnico di Bari--Itlay, Via E. Orabona 4, Bari 70125, Italy;Department of Electrotecnology and Electronic, Politecnico di Bari--Itlay, Via E. Orabona 4, Bari 70125, Italy
Venue:
Neural Networks - 2003 Special issue: Neural network analysis of complex scientific data: Astronomy and geosciences
Year:
2003

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Abstract

Environmental data sets are characterized by a huge amount of heterogeneous data from external fields. As the number of measured points grows, a strategy is needed to select and efficiently analyze the useful information from the whole data set. One efficient way of obtaining the validation-compression of data sets is the adoption of a restricted set of features that describe, with an assigned accuracy a subset of the whole data set. One characteristic feature of the environmental data is time dependency: in the medium and long term they are not stationary data sets. The aim of this work is to propose a feature extraction technique based on a new model of an unsupervised neural network suitable to analyze this kind of data. The paper reports the results obtained utilizing the above extraction and analysis procedure on a real data set on chemical pollutants. It is shown that the proposed neural network is able to identify correctly human and/or meteorological effects in the environmental data set.