Maintaining knowledge about temporal intervals
Communications of the ACM
Qualitative representation of spatial knowledge in two-dimensional space
The VLDB Journal — The International Journal on Very Large Data Bases - Spatial Database Systems
Consistent Queries over Cardinal Directions Across Different Levels of Detail
DEXA '00 Proceedings of the 11th International Workshop on Database and Expert Systems Applications
Composing cardinal direction relations
Artificial Intelligence
Cardinal directions between spatial objects: the pairwise-consistency problem
Information Sciences—Informatics and Computer Science: An International Journal
Modeling ontological concepts of locations with a heterogeneous cardinal direction model
KSEM'10 Proceedings of the 4th international conference on Knowledge science, engineering and management
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Cardinal direction relations are binary spatial relations determined under an extrinsically-defined direction system (e.g., north of). We already have point-based and region-based cardinal direction calculi, but for the relations between other combinations of objects we have only a model. We are, therefore, developing heterogeneous cardinal direction calculus, which allows reasoning on cardinal direction relations without regard to object types. In this initial report, we reformulate the definition of cardinal direction relations, identify the sets of relations between various pairs of objects, and develop the methods for deriving upper approximation of converse and composition.