Spatio-temporal data is ubiquitous-everything evolves with time-be it stock market prices of a stock or the political ideology of a community. Such data tend to occur not just in traditional sciences but also in Social and Political Sciences. The advent of Global Positioning Systems and Transport GIS (TGIS) fuelled a need for understanding the spatio-temporal aspects of the data in data-mining techniques. Radio-tracked taxicabs and wildlife tracking are fine examples of the above. Geo-marketing, as in marketing to a specific set of consumers (cell phone users as an example) based on their spatio-temporal behavior is already catching on; telecommunication companies are expanding their networks based on such data.
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