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Modeling moving objects has become a topic of increasing interest in the area of video databases. Two k ey aspects of such modeling are object spatial and temporal relationships. In this paper we i n troduce an innovative w ay to represent the trajectory of single moving object and the relative spatio-temporal relations between multiple moving objects. The representation supports a rich set of spatial topological and directional relations. It also supports both quantitative and qualitative userdoi:10.7939/r3tb0xw6g fatcat:thitvaxqzjd3noq4u7nimjkmxy