Integrating cardinal direction relations and other orientation relations in Qualitative Spatial Reasoning
Abstract
Description
We propose a calculus integrating two calculi well-known in Qualitative Spatial Reasoning (QSR): Frank's projection-based cardinal direction calculus, and a coarser version of Freksa's relative orientation calculus. An original constraint propagation procedure is presented, which implements the interaction between the two integrated calculi. The importance of taking into account the interaction is shown with a real example providing an inconsistent knowledge base, whose inconsistency (a) cannot be detected by reasoning separately about each of the two components of the knowledge, just because, taken separately, each is consistent, but (b) is detected by the proposed algorithm, thanks to the interaction knowledge propagated from each of the two compnents to the other.
Includes new material, such as a section on the use of the work in the concrete domain of the ALC(D) spatio-temporalisation defined in http://arXiv.org/abs/cs.AI/0307040
Includes new material, such as a section on the use of the work in the concrete domain of the ALC(D) spatio-temporalisation defined in http://arXiv.org/abs/cs.AI/0307040