Video modeling has become a topic of increasing interest in the area of multimedia research. One of the key aspects in the video medium is spatial relationships. In this paper we propose a spatial representation, based on the temporal interval algebra, for specifying the spatial semantics of video data. Based on such a representation, a set of comprehensive spatial relationships for salient objects are defined in supporting qualitative and quantitative spatial properties. Further, both topological and directional spatial relationships are captured within the proposed model. We present a novel way of incorporating the spatial model into a video model, called a common video object tree, and integrating the abstract video model into an objectbase management system which has rich multimedia temporal operations. The integrated video objectbase management system supports a broad range of spatial queries and is extensible, thus allowing the easy incorporation of new features into the system. Our focus here is in supporting different types of spatial queries including direct spatial queries, hybrid
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