Unsupervised Optimal Fuzzy Clustering
IEEE Transactions on Pattern Analysis and Machine Intelligence
Introduction: Geographic Information Systems in Public Health and Medicine
Journal of Medical Systems
Extended fuzzy C-means clustering algorithm for hotspot events in spatial analysis
International Journal of Hybrid Intelligent Systems
The extended fuzzy C-means algorithm for hotspots in spatio-temporal GIS
Expert Systems with Applications: An International Journal
Clustering algorithms based on volume criteria
IEEE Transactions on Fuzzy Systems
Fuzzy clustering with volume prototypes and adaptive cluster merging
IEEE Transactions on Fuzzy Systems
Advances in Fuzzy Systems - Special issue on Fuzzy Methods and Approximate Reasoning in Geographical Information Systems
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We show a new approach for detecting hotspots in spatial analysis based on the extended Gustafson-Kessel clustering method encapsulated in a Geographic Information System (GIS) tool. This algorithm gives (in the bidimensional case) ellipses as cluster prototypes to be considered as hotspots on the geographic map and we study their spatiotemporal evolution. The data consist of georeferenced patterns corresponding to positions of Taliban's attacks against civilians and soldiers in Afghanistan that happened during the period 2004-2010. We analyze the formation through time of new hotspots, the movement of the related centroids, the variation of the surface covered, the inclination angle, and the eccentricity of each hotspot.