Fuzziness widely exists in most of spatiotemporal applications, but the existing spatiotemporal data models cannot support representation of fuzzy spatiotemporal objects and their semantic relationships. In this paper, after investigating the semantics of fuzzy spatiotemporal data, we propose a novel approach to model fuzzy spatiotemporal object based on UML class diagram. Firstly, we propose a formal definition about fuzzy spatiotemporal Event-Process. On this basis, the UML data model is extended to represent fuzzy spatial and temporal data. Finally, the potential usefulness of our fuzzy spatiotemporal UML object model is demonstrated with an example taken from Fujiwara Effect.
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