Spatio-temporal data are such spatial data as change over time. Data models for spatial databases have been studied and presented. In these models, no time-dimension is provided, so objects are supposed to change neither their shapes, nor their positions. Recently, spatial data models with time-dimension, called spatio-temporal data models, have been requested for modelling real world where objects change their positions and shapes over time. This pa- per presents such a data model based on a mathematical notion to represent gradual changes of objects. This model, named Universe, transforms spatio-temporal data into topological spaces. Universe supports a set of operators and predicates on the topological spaces so that users can retrieve any time-varying data in a unifom way. How to represent spatio-temporal data in Universe and how to use the operators provided by Universe for spatio-temporal queries are discussed in this paper.
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