Research Publications: UM-SG-RS-2016-32


On Information Criteria for Dynamic Spatio-temporal Clustering




Schaeffer, ED; Testa, JM; Gel, YR; Lyubchich, V


Proceedings of the 6th International Workshop on Climate Informatics: CI 2016
: 5 - 8




Modern climate data sets, including paleoreconstructions, long-term weather monitoring records, and remote sensing data, contain a wealth of space-timeinformation that leads to a variety of challenges related to data storage, management, and analysis. This has sparked an interest in dynamic space-time clustering algorithms that are particularly suitable for the analysis of large data streams. The trend-based clustering algorithm TRUST allows segmentation of space-time processes in real time, but requires the user to set multiple tuning parameters, and this step is usually performed in a subjective manner. Here we propose a data-driven automatic approach to simultaneously select the tuning parameters based on a penalized loss function. We focus on the two most important parameters of the TRUST algorithm, which define short-term closeness of observations across locations and long-term persistence of such closeness within an analyzed time window. We demonstrate the performance of the enhanced clustering procedure using simulated time series, and illustrate its applicability using long-term records of water temperature in Chesapeake Bay.

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