Forecasting in geophysical time series is a challenging problem with numerous applications. The presence of correlation (i.e. spatial correlation across several sites and time correlation within each site) poses difficulties with respect to traditional modeling, computation and statistical theory. This paper presents a cluster-centric forecasting methodology that allows us to yield a characterization of correlation in geophysical time series through a spatio-temporal clustering step. The clustering phase is designed for partitioning time series of numeric data routinely sampled at specific space locations. A forecasting model is then computed by resorting to multivariate time series analysis, in order to predict the future values of a time series by utilizing not only its own historical values, but also information from other cluster-time series. Experimental results highlight the importance of dealing with both temporal and spatial correlation and validate the proposed cluster-centric strategy in the computation of a multivariate time series forecasting model.
['Sonja Pravilovic', 'Massimo Bilancia', 'Annalisa Appice', 'Donato Malerba']
Using multiple time series analysis for geosensor data forecasting