## A Family of Directional Relation Models for Extended Objects

- Spiros Skiadopoulos, Nikos Sarkas, Timos K. Sellis, Manolis Koubarakis
- IEEE Transactions on Knowledge and Dataâ€¦
- 2007

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@inproceedings{Billen2004AMF, title={A Model for Ternary Projective Relations between Regions}, author={Roland Billen and Eliseo Clementini}, booktitle={EDBT}, year={2004} }

- Published 2004 in EDBT
DOI:10.1007/978-3-540-24741-8_19

Current spatial database systems offer limited querying capabilities beyond topological relations. This paper introduces a model for projective relations between regions to support other qualitative spatial queries. The relations are ternary because they are based on the collinearity invariant of three points under projective geometry. The model is built on a partition of the plane in five regions that are obtained from projective properties of two reference objects: then, by considering theâ€¦Â CONTINUE READING

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