Maintaining knowledge about temporal intervals
Communications of the ACM
Composing Cardinal Direction Relations
SSTD '01 Proceedings of the 7th International Symposium on Advances in Spatial and Temporal Databases
Cardinal directions between spatial objects: the pairwise-consistency problem
Information Sciences—Informatics and Computer Science: An International Journal
A new tractable subclass of the rectangle algebra
IJCAI'99 Proceedings of the 16th international joint conference on Artifical intelligence - Volume 1
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Qualitative techniques are important in spatio-temporal reasoning and in artificial intelligence in general. The Cardinal Direction Calculus (CDC) is one of the classic formalisms which represents the spatial relations between objects whose positions are described in the reference to the geographical directions. This particular model may be used in many systems also in the applications which are based on natural language input. In this paper we discuss the problem of generating an intuitive, simple and quickly understood answer to specific question concerning spatial relations asked by a user of a system. We present the results of the linguistic experiment which was performed to analyse human language competence in describing space.